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  • 1985-1989  (1,263,348)
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Year
  • 101
    Publication Date: 2023-07-10
    Keywords: 44-391C; Ammodiscus granulosus; Aptychi abundance; Astacolus rasus; Astacolus schloenbachi; Astacolus sp.; Bigenerina antiquissima; Bigenerina arcuata; Citharina cuneata; Conorboides hofkeri; Conorboides pygmaea; Deep Sea Drilling Project; Dentalina sp.; DEPTH, sediment/rock; Dorothia spissa; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Echinoidea spiculae; Eoguttulina bilocularis; Epistomina uhligi; Epoch; Fish remains; Formation; Gavelinella barremiana; Globigerinelloides sp.; Globuligerina oxfordiana; Glomar Challenger; Glomospira variabilis; Glomospirella gaultina; Haplophragmium euides; Hedbergella sp.; Hyperammina gaultina; Leg44; Lenticulina bochardi; Lenticulina deilmanni; Lenticulina eichenbergi; Lenticulina quenstedti; Lenticulina roemeri; Lenticulina sp.; Lingulina franconica; Lingulina loryi; Lingulina nodulosa; Lingulina sp.; Lingulina umbra; Lithology/composition/facies; Marginulina inepta; Marginulina linearis; Marginulina minuta; Marginulina trunculata; Marginulinopsis antiquata; Marginulinopsis vetusta; Neobulimina atlantica; Nodosaria nitidula; North Atlantic/BASIN; Ophthalmidium rotula; Ostracoda; Palmula humilis; Porifera spiculae; Praedorothia ouachensis; Protomarssonella kummi; Psammosphaera sp.; Pseudonodosaria humilis; Pseudonodosaria tenuis; Pyrulina cylindroides; Quinqueloculina minima; Radiolarians abundance; Reophax helveticus; Sample code/label; Spirillina polygyrata; Textulariopsis sp.; Tristix acutangulus; Trochammina canningensis; Trocholina sp.
    Type: Dataset
    Format: text/tab-separated-values, 900 data points
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  • 102
    Publication Date: 2023-07-10
    Keywords: 13-120; Ammodiscus granulosus; Astacolus cephalotus; Astacolus erucaeformis; Astacolus sp.; Bigenerina arcuata; Deep Sea Drilling Project; Dentalina sp.; DEPTH, sediment/rock; Dorothia filiformis; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Echinoidea spiculae; Epoch; Fish remains; Gaudryina sp.; Glomar Challenger; Glomospira variabilis; Glomospirella gaultina; Guttulina subsphaerica; Haplophragmium aequale; Haplophragmium euides; Haplophragmoides concavus; Hyperammina gaultina; Leg13; Lenticulina nodosa; Lenticulina sp.; Lingulina loryi; Lingulina umbra; Marginulinopsis matutina; Marginulinopsis vetusta; Nodosaria nitidula; North Atlantic/BANK; Ostracoda; Palmula sp.; Pseudonodosaria humilis; Pyrulina cylindroides; Ramulina spandeli; Reophax aff. helveticus; Sample code/label; Vaginulina linearis; Vaginulina sp.; Verneuilinoides neocomiensis
    Type: Dataset
    Format: text/tab-separated-values, 70 data points
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  • 103
    Publication Date: 2023-07-10
    Keywords: 32-305; Astacolus sp.; Conorotalites aptiensis; Deep Sea Drilling Project; Dentalina debilis; Dentalina sp.; DEPTH, sediment/rock; Dorothia conula; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Echinoidea spiculae; Eggerella sp.; Eoguttulina bilocularis; Epoch; Fish remains; Gaudryina compacta; Gaudryina dividens; Gaudryina mendrisiensis; Gavelinella barremiana; Globigerinelloides sp.; Glomar Challenger; Gubkinella graysonensis; Guttulina pygmaea; Gyroidinoides aff. nitida; Hedbergella sp.; Leg32; Lenticulina sp.; Lingulina sp.; Lingulina umbra; Lithology/composition/facies; Marginulina sp.; Marginulinopsis vetusta; Marssonella oxycona; Nodosaria sp.; North Pacific/CONT RISE; Osangularia brotzeni; Ostracoda; Pleurostomella obtusa; Porifera spiculae; Praedorothia ouachensis; Pseudoclavulina gaultina; Pseudonodosaria humilis; Radiolarians abundance; Ramulina spandeli; Rotalipora sp.; Sample code/label; Saracenaria sp.; Spirillina polygyrata; Spiroplectammina gandolfii; Spiroplectammina losangica; Ticinella sp.; Triloculina sp.; Tristix acutangulus; Tritaxia tricarinata; Vaginulina recta; Vaginulina sp.; Valvulineria loetterlei
    Type: Dataset
    Format: text/tab-separated-values, 1250 data points
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  • 104
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    Unknown
    PANGAEA
    In:  Supplement to: Eleftheriou, Anastasios; Basford, D J (1989): The macrobenthic infauna of the offshore northern North Sea. Journal of the Marine Biological Association of the United Kingdom, 69(1), 123-143, https://doi.org/10.1017/S0025315400049158
    Publication Date: 2023-08-05
    Description: Between 1980 and 1985 ninety-seven stations were sampled by Smith-Mclntyre grab from the offshore northern section of the North Sea. Four hundred and nine infaunal species were identified from the 76 selected macrofaunal stations. The number of species per station varied from 25 to 80 with a maximum abundance of 9,600 individuals m**2. The biomass ranged from 0.13 to 18.86 g dry weight m**2. At most stations, however, biomass varied between 1 and 4 g dry weight m**2. Diversity and abundance were highest in the 120–140 m zone, characterised by fine sand containing variable amounts of silt. The highest biomasses were recorded in two areas; firstly where stronger currents predominate and the sediments are coarser (east of Shetland and west of the Norwegian Trough), and secondly in the fine sandy deposits of the centrally located area. In the silty sediments (Fladen Ground and smaller depressions) there was a predominantly subsurface deposit-feeding community, whereas in the coarser area east of the Shetlands carnivores predominated. Over the remaining area surface deposit feeders were dominant.
    Keywords: MarGIS
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 105
    Publication Date: 2023-08-05
    Keywords: Benthos; Benthos, other; Counting; Crustacea; DEPTH, sediment/rock; Echinodermata; LATITUDE; LONGITUDE; Mollusca; Polychaeta; Sample code/label; Species richness
    Type: Dataset
    Format: text/tab-separated-values, 988 data points
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  • 106
    Publication Date: 2023-08-05
    Keywords: Counting; Occurrence; Score; Species
    Type: Dataset
    Format: text/tab-separated-values, 200 data points
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  • 107
    Publication Date: 2023-08-15
    Keywords: AT_II-107_19; ATII_USA; Atlantis II (1963); Cadmium/Calcium ratio; CHN115-26PG; CHN115-27PG; CHN115-36PG; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; GC; Gravity corer; K708-006; KNR54-16BC; Latitude of event; Longitude of event; PC; Piston corer; RAMA; RAMA03WT; RAMA-44P; RC09; RC09-225; Robert Conrad; South Atlantic; Thomas Washington; V23; V23-23; V23-42; V23-82; V27; V27-17; V27-19; V27-20; V29; V29-183; Vema
    Type: Dataset
    Format: text/tab-separated-values, 40 data points
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  • 108
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    Unknown
    PANGAEA
    In:  Supplement to: Keigwin, Lloyd D; Boyle, Edward A (1989): Late Quaternary paleochemistry of high-latitude surface waters. Palaeogeography, Palaeoclimatology, Palaeoecology, 73(1-2), 85-106, https://doi.org/10.1016/0031-0182(89)90047-3
    Publication Date: 2023-08-15
    Description: Recent studies have stressed the role of high latitude nutrient levels and productivity in controlling the carbon isotopic composition of the deep sea and the CO2 content of the atmosphere. We undertook a study of the chemical composition of the polar planktonic foraminifer Neogloboquadrina pachyderma (s., sinistral coiling) from 30 late Holocene samples and 49 down core records from the high-latitude North and South Atlantic Oceans to evaluate the history of sea surface chemical change from glacial to interglacial time. Stable isotopic analysis of coretop samples from the Atlantic, Pacific and Southern Oceans shows no significant correlation between the delta13C of N. pachyderma and either delta13C or PO4 in seawater. Conversely, Cd/Ca ratios in planktonic foraminifera are consistent with the PO4 content of surface waters. The level of maximum glaciation (18,000 yr B.P.), identified by CLIMAP and delta18O, was chosen for mapping. Isopleths of delta18O on N. pachyderma (s.) in the North Atlantic reveal a pattern largely influenced by sea surface temperature (S.S.T.) and generally support the S.S.T. reconstruction of CLIMAP. Differences between the two suggest significantly lower salinity in North Atlantic surface waters at high latitudes than in lower latitudes. Down core delta13C records of N. pachyderma confirm that low delta13C values occurred in the northeast Atlantic during the latest glacial maximum (Labeyrie and Duplessy, 1985, doi:10.1016/0031-0182(85)90069-0). However, a map of delta13C for the 18,000 yr B.P. level for a much larger region in the North Atlantic shows that minimum N. pachyderma delta13C occurred in temperate waters. N. pachyderma delta13C decreased toward the southwest, reaching a minimum of -1 per mil at 37°N. Despite the variability seen in delta13C records of N. pachyderma, none of our cores show significant temporal variability in Cd/Ca. From the combined Cd/Ca and delta13C data we can see no evidence for an upwelling gyre in the eastern North Atlantic during the latest glacial maximum, nor evidence that the southern and northern oceans had significantly different levels of preformed nutrients than today.
    Keywords: 94-606_Site; AT_II-107_19; AT_II-107_22; ATII_USA; Atlantic Ocean; Atlantis II (1963); CEPAG; CH67-19; CH69-32; CH69-69; CH6X; CH70-K11; CH72-101; CH72-104; CH73-110; CH73-136; CH73-139; CH73-139C; CH77-07; CH7X; CH8X; CHN115-26PG; CHN115-27PG; CHN115-36PG; CHN82-04; CHN82-15; CHN82-20; CHN83-20; COMPCORE; Composite Core; Core; CORE; Fram-I; FramI/7; FramII/4; GC; GEOGAS; Glomar Challenger; Gravity corer; Gravity corer (Kiel type); HU75-41; HU75-42; Ice drift station; Jean Charcot; K708-006; Keigwin_31-33; KN708-1; KN708-6; KN714-15; KNR54-16BC; Leg94; Le Noroit; Le Suroît; NO77/79; NO79-06; North Atlantic; North Atlantic/FLANK; PC; Piston corer; RAMA; RAMA03WT; RAMA-44P; RC09; RC09-225; Robert Conrad; ROMANCHA; SL; South Atlantic; SU81-47; Thomas Washington; V23; V23-23; V23-42; V23-81; V23-82; V23-83; V27; V27-114; V27-116; V27-17; V27-19; V27-20; V27-60; V27-86; V28; V28-14; V28-56; V29; V29-177; V29-178; V29-179; V29-180; V29-183; V29-206; V30; V30-101; V30-108; V30-96; V30-97; Vema
    Type: Dataset
    Format: application/zip, 9 datasets
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  • 109
    Publication Date: 2023-07-24
    Keywords: 94-607_Site; AGE; Calcium carbonate; Cibicidoides spp., δ13C; Cibicidoides spp., δ18O; COMPCORE; Composite Core; Deep Sea Drilling Project; DEPTH, sediment/rock; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Leg94; Mass spectrometer Finnigan MAT 251; North Atlantic/FLANK; Sample code/label; Uvigerina spp., δ13C; Uvigerina spp., δ18O
    Type: Dataset
    Format: text/tab-separated-values, 1352 data points
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  • 110
    Publication Date: 2023-07-24
    Keywords: 94-607_Site; AGE; Cibicidoides spp., δ13C; Cibicidoides spp., δ18O; COMPCORE; Composite Core; Deep Sea Drilling Project; DEPTH, sediment/rock; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Leg94; Mass spectrometer Finnigan MAT 251; North Atlantic/FLANK; Sample code/label; Uvigerina spp., δ13C; Uvigerina spp., δ18O
    Type: Dataset
    Format: text/tab-separated-values, 1383 data points
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  • 111
    Publication Date: 2023-07-11
    Keywords: Cadmium/Calcium ratio; DEPTH, sediment/rock; GC; Gravity corer; KN714-15; Neogloboquadrina pachyderma sinistral, δ13C; Neogloboquadrina pachyderma sinistral, δ18O; Size fraction
    Type: Dataset
    Format: text/tab-separated-values, 20 data points
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  • 112
    Publication Date: 2023-11-09
    Keywords: Adercotryma glomeratum; Ammodiscus pacificus; Ammomarginulina foliacea; Ammomarginulina foliacea curvata; Ammoscalaria pseudospiralis; ANT-IV/3; Atka Bay; Bathysiphon filiformis; Bulimina aculeata; Cassidulina crassa rossensis; Counting 〉125 µm fraction; Cribrostomoides crassimargo; Cribrostomoides jeffreysii; Cribrostomoides rotulatum; Cribrostomoides subglobosum; Cribrostomoides wiesneri; Crithionina pisum; Crithionina sp.; Cyclammina cancellata; Cyclammina orbicularis; Cyclammina pusilla; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Eggerella bradyi; Ehrenbergina glabra; Eponides tumidulus; Foraminifera, benthic dead; Foraminifera, benthic indeterminata; Foraminifera, benthic specimens; Fursenkoina davisi; Giant box corer; GKG; Globocassidulina subglobosa; Glomospira charoides; Haplophragmoides bradyi; Hormosina normani; Hyperammina cylindrica; Marsipella cylindrica; Martinottiella nodulosa; Miliammina arenacea; Miliolinella sp.; Nonionella bradyi; Oolina globulosa; Pelosina sp.; Pelosinella bicaudata; Polarstern; PS08; PS08/374; PS1394-3; Psammosiphonella sp.; Psammosphaera fusca; Pullenia bulloides; Recurvoides contortus; Reophax aduncus; Reophax calcareus; Reophax cylindricus; Reophax dentaliniformis; Reophax difflugiformis; Reophax fusiformis; Reophax indivisa; Reophax nodulosus; Reophax ovicula; Reophax scorpiurus; Reophax spiculifer; Rhabdammina abyssorum; Rhabdammina linearis; Rhabdammina sp.; Rotaliammina ochracea; Saccammina sp.; Saccammina sphaerica; Saccorhiza ramosa; Stortosphaera albida; Textularia wiesneri; Thurammina papillata; Trifarina angulosa; Trifarina earlandii; Tritaxis squamata; Trochammina nana; Trochammina pygmaea; Trochammina sp.; Trochammina spp.
    Type: Dataset
    Format: text/tab-separated-values, 1656 data points
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  • 113
    Publication Date: 2023-11-09
    Keywords: Adercotryma glomeratum; Ammomarginulina ensis; Ammomarginulina foliacea; Ammoscalaria pseudospiralis; ANT-IV/3; Atka Bay; AWI_Paleo; Cassidulina biora; Cassidulina crassa; Cassidulina laevigata; Cassidulinoides porrectus; Cibicides bertheloti; Cibicides corpulentus; Cibicides grossepunctatus; Cibicides pseudoungerianus; Cibicides spp.; Cibicidoides wuellerstorfi; Counting 〉125 µm fraction; Cribrostomoides crassimargo; Cribrostomoides jeffreysii; Cribrostomoides subglobosum; Cribrostomoides wiesneri; Cyclammina orbicularis; Cyclammina pusilla; Cyclogyra foliacea; Dentalina communis; Dentalina pauperata; Dentalina spp.; DEPTH, sediment/rock; Eggerella bradyi; Eggerella scabra; Ehrenbergina glabra; Epistominella exigua; Epistominella sp.; Epistominella umbonifera; Eponides tumidulus; Eponides weddellensis; Fissurina auricolata; Fissurina cf. serrata; Fissurina orbignyana; Fissurina sp.; Fissurina spp.; Fissurina subformosa; Foraminifera, agglutinated, species indeterminata; Foraminifera, rotalide, species indeterminata; Fursenkoina davisi; Fursenkoina earlandi; Fursenkoina fusiformis; Glandulina antarctica ssp.; Globocassidulina crassa rossensis; Globocassidulina subglobosa; Glomospira charoides; Gravity corer (Kiel type); Guttulina sp.; Gyroidina neosoldanii; Gyroidina sp.; Haplophragmoides bradyi; Haplophragmoides sphaeriloculus; Hormosina normani; Hormosina sp.; Karreriella bradyi; Karreriella novangliae; Lagena laevis; Lagena nebulosa; Lagena spp.; Lagena striata; Lagena subacuticosta; Laticarinina pauperata; Lenticulina antarctica; Lenticulina spp.; Marginulina spp.; Marsipella cylindrica; Martinottiella nodulosa; Melonis affinis; Melonis pompilioides; Melonis zaandamae; Miliammina arenacea; Miliolina; Miliolinella sp.; Nodellum membranaceum; Nodosaria spp.; Nonionella bradii; Nonionella iridea; Oolina hexagona; Oolina melo; Oolina ovum; Oolina sp.; Oridorsalis sidebottomi; Oridorsalis umbonatus; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Parafissurina cf. tectulostoma; Parafissurina marginata; Parafissurina spp.; Parafissurina tectulostoma; Pelosina rotundata; Pelosinella bicaudata; Pelosinella sp.; Polarstern; Portatrochammina sp.; PS08; PS08/366; PS1388-3; Psammosphaera fusca; Pullenia bulloides; Pullenia simplex; Pullenia subcarinata; Pyrgo depressa; Quinqueloculina spp.; Recurvoides contortus; Reophax aduncus; Reophax dentaliniformis; Reophax nodulosus; Reophax ovicula; Reophax scorpiurus; Reophax spp.; Rhabdammina cf. linearis; Rhabdammina spp.; Saccammina sphaerica; Saccorhiza ramosa; SFB261; Siphotextularia flintii; SL; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; Subreophax aduncus; Textularia sp.; Textulariina; Trifarina earlandii; Triloculina frigida; Triloculina tricarinata; Tritaxis squamata; Trochammina pygmaea; Uvigerina hollicki
    Type: Dataset
    Format: text/tab-separated-values, 12862 data points
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  • 114
    Publication Date: 2023-11-09
    Keywords: Adercotryma glomeratum; Ammobaculites agglutinans; Ammodiscus spp.; Ammomarginulina foliacea; Ammomarginulina foliacea curvata; ANT-IV/3; Atka Bay; AWI_Paleo; Bulimina aculeata; Cassidulina teretis; Cibicidoides sp.; Counting 〉125 µm fraction; Cribrostomoides jeffreysii; Cribrostomoides spp.; Cribrostomoides subglobosum; Cribrostomoides wiesneri; Crithionina spp.; Cyclammina pusilla; Cyclogyra foliacea; Dentalina communis; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Dorothia conica; Eggerella bradyi; Ehrenbergina glabra; Epistominella exigua; Eponides tumidulus; Foraminifera, benthic indeterminata; Foraminifera, benthic living; Foraminifera, benthic specimens; Fursenkoina davisi; Giant box corer; GKG; Globocassidulina subglobosa; Glomospira charoides; Gyroidina neosoldanii; Haplophragmoides bradyi; Hippocrepina sp.; Lagena meridionalis; Lagena nebulosa; Martinottiella nodulosa; Miliammina arenacea; Miliolinella sp.; Miliolinella subrotunda; Nonionella iridea; Oridorsalis umbonatus; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Pelosinella sp.; Polarstern; PS08; PS08/374; PS1394-3; Pullenia bulloides; Pullenia simplex; Quinqueloculina pygmaea; Quinqueloculina sp.; Recurvoides contortus; Reophax aduncus; Reophax bilocularis; Reophax dentaliniformis; Reophax fusiformis; Reophax nodulosus; Reophax ovicula; Reophax scorpiurus; Reophax spiculifer; Rhabdammina linearis; Rhabdammina spp.; Rhizammina algaeformis; Robertinoides sp.; Saccorhiza ramosa; Textularia wiesneri; Trifarina earlandii; Trochammina conica; Trochammina nana; Trochammina sp.; Trochammina spp.
    Type: Dataset
    Format: text/tab-separated-values, 390 data points
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  • 115
    Publication Date: 2023-11-09
    Keywords: Adercotryma glomeratum; Ammobaculites agglutinans; Ammodiscus spp.; Ammomarginulina foliacea; Ammomarginulina foliacea curvata; ANT-IV/3; Atka Bay; AWI_Paleo; Bulimina aculeata; Counting 〉125 µm fraction; Cribrostomoides jeffreysii; Cribrostomoides spp.; Cribrostomoides subglobosum; Cribrostomoides wiesneri; Crithionina spp.; Cyclammina orbicularis; Cyclogyra involvens; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Eggerella bradyi; Epistominella exigua; Foraminifera, benthic indeterminata; Foraminifera, benthic living; Foraminifera, benthic specimens; Giant box corer; GKG; Globocassidulina subglobosa; Glomospira charoides; Haplophragmoides bradyi; Hippocrepina flexibilis; Hormosina robusta; Marsipella cylindrica; Martinottiella nodulosa; Melonis zaandamae; Miliolinella subrotunda; Nonionella iridea; Oridorsalis umbonatus; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Pelosinella sp.; Polarstern; Portatrochammina spp.; PS08; PS08/374; PS1394-1; Psammosphaera fusca; Pullenia bulloides; Pullenia simplex; Pullenia subcarinata; Quinqueloculina sp.; Recurvoides contortus; Reophax aduncus; Reophax bilocularis; Reophax dentaliniformis; Reophax distans; Reophax fusiformis; Reophax horridus; Reophax nodulosus; Reophax ovicula; Reophax scorpiurus; Reophax spiculifer; Reophax spp.; Rhabdammina linearis; Rhabdammina spp.; Rhizammina algaeformis; Robertinoides sp.; Saccammina sphaerica; Saccorhiza ramosa; Textularia earlandi; Trifarina earlandii; Triloculina sp.; Tritaxis squamata; Trochammina sp.; Trochammina spp.
    Type: Dataset
    Format: text/tab-separated-values, 310 data points
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  • 116
    Publication Date: 2023-11-09
    Keywords: Adercotryma glomeratum; Ammobaculites foliaceoum; Astrammina rara; Astrononion gallowayi; Bolivina arctica; Bolivina spathulata; Brizalina pseudopunctata; Buccella frigida; Bulimina marginata; Buliminella hensoni; Cassidulina laevigata; Cassidulina reniforme; Cassidulina subglobosa; Cibicides lobatulus; Counting 〉63 µm fraction; Cribrostomoides subglobosum; Dendrophyra arborescens; Dentalina spp.; DEPTH, sediment/rock; Eggerella advena; Elphidium bartletti; Elphidium excavatum forma clavata; Elphidium subarcticum; Eoeponides pulchella; Epistominella takayanagii; Event label; Fissurina spp.; Foraminifera, benthic agglutinated indeterminata; Foraminifera, benthic specimens; Foraminifera, planktic; Fursenkoina fusiformis; Fursenkoina pauciloculata; Globobulimina auriculata; Haynesina orbicularis; HUD85-027-16; HUD85-027-16TC; Hyperammina elongata; Islandiella islandica; Islandiella teretis; Labrador Sea; Lagena spp.; Laryngosigma hyalascidia; Lenticulina spp.; Miliolina subrotundra; Nonion barleeanum; Nonionella labradorica; Number of species; Nuttallides umbonifera; Oolina hexagona; Oridorsalis umbonatus; Patellina corrugata; PC; Piston corer; Planulina wuellerstorfi; Psammosphaera fusca; Pseudopolymorphina novangliae; Pullenia subcarinata; Pyrgo williamsoni; Quinqueloculina arctica; Quinqueloculina culturata; Quinqueloculina seminulum; Quinqueloculina stalkeri; Recurvoides scitulum; Reophax arcticus; Reophax scotti; Rhabdammina agglutissima; Rhizammina algaeformis; Saccammina difflugiformis; Stetsonia horvathi; TC; Textularia wiesneri; Trigger corer; Triloculina trihedra; Trochammina globigeriniformis; Uvigerina peregrina; Valvulineria arctica; Valvulineria laevigata
    Type: Dataset
    Format: text/tab-separated-values, 6901 data points
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  • 117
    Publication Date: 2023-11-09
    Keywords: Adercotryma glomeratum; Astacolus crepidulus; Astacolus insolitus; Astrononion gallowayi; Bolivina arctica; Bolivina pseudoplicata; Bolivina robusta; Bolivina spathulata; Bolivina subspinescens; Brizalina pseudopunctata; Buccella frigida; Bulimina exilis; Bulimina gibba; Bulimina notovata; Buliminella hensoni; Carterina spiculotesta; Cassidulina reniforme; Cassidulina subglobosa; Cassidulinoides bradyi; Cibicides lobatulus; Cibicides pseudoungerianus; Cibicides robertsonianus; Cibicides subhaidingerii; Counting 〉63 µm fraction; Cribrostomoides crassimargo; Cribrostomoides subglobosum; Dentalina spp.; DEPTH, sediment/rock; Discopulvinulina spp.; Discorbis spp.; Eggerella advena; Eggerella bradyi; Elphidium bartletti; Elphidium excavatum; Elphidium excavatum forma clavata; Elphidium excavatum forma excavatum; Elphidium incertum; Elphidium subarcticum; Elphidium ustulatum; Epistominella exigua; Eponides bradyi; Eponides tumidulus; Event label; Fissurina spp.; Foraminifera, benthic specimens; Fursenkoina fusiformis; Globobulimina auriculata; Globobulimina spp.; Glomospira gordialis; Guttulina spp.; Gyroidina soldanii; Haynesina orbicularis; Hoeglundina elegans; HUD84-030-04; HUD84-030-04TC; Hyalinea balthica; Hyperammina spp.; Hyperammina subnodosa; Islandiella teretis; Karreriella apicularis; Karreriella bradyi; Labrador Sea; Lagena spp.; Lenticulina spp.; Miliolina spp.; Nodosaria lamnulifera; Nodosaria spp.; Nonion barleeanum; Nonionella turgida; Number of species; Nuttallides umbonifera; Oolina spp.; Ophthalmidium acutimargo; Oridorsalis umbonatus; Patellina corrugata; PC; Piston corer; Planulina spp.; Planulina wuellerstorfi; Psammosphaera fusca; Pseudopolymorphina novangliae; Pullenia bulloides; Pullenia subcarinata; Pyrgo williamsoni; Pyrulina gutta; Quinqueloculina agglutinans; Quinqueloculina culturata; Quinqueloculina seminulum; Reophax bacillaris; Reophax scorpiurus; Rhizammina algaeformis; Rhizammina spp.; Robertinoides charlottensis; Saccammina difflugiformis; Saccammina sphaerica; Sigmoilopsis schlumbergeri; Siphotextularia rolshauseni; Sphaeroidina bulloides; Spiroplectammina biformis; Stetsonia horvathi; TC; Tosaia hanzawai; Trifarina fluens; Trigger corer; Triloculina arctica; Triloculina trihedra; Trochammina nana; Trochammina pacifica; Trochammina spp.; Trochamminella atlantica; Uvigerina asperula; Uvigerina peregrina; Valvulineria arctica
    Type: Dataset
    Format: text/tab-separated-values, 7519 data points
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  • 118
    Publication Date: 2023-11-09
    Keywords: Adercotryma glomeratum; Ammobaculites agglutinans; Ammobaculites foliaceoum; Amphacorinella spp.; Amphistegina gibbosa; Astacolus crepidulus; Astacolus spp.; Bolivina arctica; Bolivina cf. subspinescens; Brizalina pseudopunctata; Buccella frigida; Bulimina aculeata; Bulimina elegantissima; Bulimina marginata; Cassidulina reniforme; Cassidulina subglobosa; Chilostomella oolina; Cibicides lobatulus; Cibicides refulgens; Cibicides robertsonianus; Cibicides subglobosum; Counting 〉63 µm fraction; Dentalina guttifera; Dentalina intorta; Dentalina ittai; Dentalina spp.; DEPTH, sediment/rock; Ehrenbergina trigona; Elphidium bartletti; Elphidium excavatum; Elphidium excavatum forma gunteri; Elphidium groenlandicum; Elphidium subarcticum; Eoeponidella pulchella; Epistominella exigua; Epistominella umbonifera; Eponides bradyi; Eponides tumidulus; Event label; Fissurina spp.; Foraminifera, benthic specimens; Fursenkoina fusiformis; Glabratella wrightii; Globobulimina auriculata; Globobulimina spp.; Globoloculina spp.; Glomospira gordialis; Guttulina spp.; Gyroidina soldanii; Haynesina orbicularis; Hoeglundina elegans; HUD84-030-01; HUD84-030-01TC; Hyperammina spp.; Islandiella islandica; Islandiella teretis; Karreriella apicularis; Karreriella bradyi; Lagena spp.; Lenticulina gibba; Lenticulina sp.; Marginulina obesa; Miliolina chuckchiensis; Nodosaria spp.; Nonion barleeanum; Nonion labradoricum; Number of species; Oolina spp.; Ophtalium acutimarge; Oridorsalis umbonatus; Orthomorphina retrorsa; Patellina corrugata; PC; Piston corer; Planulina wuellerstorfi; Pseudopolymorphina novangliae; Pullenia bulloides; Pullenia subcarinata; Pyrgo williamsoni; Quinqueloculina seminulum; Recurvoides turbinatus; Reophax bacillaris; Reophax nodulosus; Reophax scorpiurus; Reussella spp.; Robertinoides charlottensis; Rosalina spp.; Saccammina difflugiformis; Saccammina sphaerica; Stainforthia concava; Stainforthia fusiformis; Stetsonia horvathi; TC; Textularia torquata; Tosaia hanzawai; Trifarina fluens; Trifarina spp.; Trigger corer; Triloculina arctica; Triloculina subcarinata; Triloculina trihedra; Trochammina spp.; Trochammina squamata; Uvigerina asperula; Uvigerina peregrina; Vaginulina spp.
    Type: Dataset
    Format: text/tab-separated-values, 14647 data points
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  • 119
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: de Lange, Gert J; Middelburg, Jack J; Poorter, R; Shofiyah, S (1989): Ferromanganese encrustations on the seabed west of Misool, eastern Indonesia. Netherlands Journal of Sea Research, 24(4), 541-553, https://doi.org/10.1016/0077-7579(89)90132-4
    Publication Date: 2023-08-28
    Description: The chemical analyses of ferromanganese encrustations found on the seabed west of Misool, eastern Indonesia, indicate that these deposits formed in a way different from that of world-wide occurring manganese nodules. Ferromanganese coated pebbles and fragments that were found in the deeper parts of the study area probably originate from nearby ridges. The ferromanganese crust on the upper part of a dolomite fragment of ?30 kg is likely to be formed by hydrogenous processes, whereas that from the lower part seems to be formed by diagenetic processes mainly. These assumptions are supported by pore-water data from two box cores taken in the same area. The manganese and iron profiles versus depth in these cores indicate a high flux of these metals to the uppermost sediment layer, and possibly into the overlying bottom water. Factor analysis for the principal components of the microprobe analytical results of the mainly hydrogenous ferromanganese crust demonstrates a strong correlation of manganese with the trace metals, of iron with phosphorus and an antipathetic relationship between iron and manganese. Similar results have also been reported for abyssal manganese nodules in the world oceans. Factor analysis for the principal components of the analytical data obtained for the diagenetic ferromanganese crust results in a clear dolomite (Ca/Mg) dilution factor only.
    Keywords: BC; Box corer; Celebes Sea; Comment; Date/Time of event; Deposit type; DEPTH, sediment/rock; Description; Elevation of event; Event label; Latitude of event; Longitude of event; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Position; Quantity of deposit; Sample ID; Sediment type; Size; Snellius-II_G4; Snellius-II_legG4/M3; Snellius-II_legG4/M4; Snellius-II_legG4/M5; Snellius-II_legG4/M6; Snellius-II_legG4/M9; Substrate type; Tyro; Uniform resource locator/link to image
    Type: Dataset
    Format: text/tab-separated-values, 44 data points
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  • 120
    Publication Date: 2023-08-05
    Keywords: Benthos, biomass, dry mass; Benthos, other, biomass, dry mass; Crustacea, biomass, dry mass; DEPTH, sediment/rock; Echinodermata, biomass, dry mass; LATITUDE; LONGITUDE; Mollusca, biomass, dry mass; Polychaeta, biomass, dry mass; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 532 data points
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  • 121
    Publication Date: 2023-07-24
    Keywords: 81-552A; AGE; Cibicidoides spp., δ13C; Cibicidoides spp., δ18O; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg81; Mass spectrometer VG Micromass 602; North Atlantic/PLATEAU
    Type: Dataset
    Format: text/tab-separated-values, 190 data points
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  • 122
    Publication Date: 2023-07-24
    Keywords: adjusted for vital effect; AGE; Cibicidoides spp., δ13C; Uvigerina spp., δ18O
    Type: Dataset
    Format: text/tab-separated-values, 150 data points
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  • 123
    Publication Date: 2023-07-10
    Keywords: Akademik Nikolaj Strakhov; ANS1; ANS1-13-D; ANS1-14-D; Archive of Ocean Data; ARCOD; Central Atlantic; Cerium; Chromium; Cobalt; Dredge; DRG; Element analysis, neutron activation (NAA); Elevation of event; Elevation of event 2; Europium; Event label; Hafnium; Lanthanum; Latitude of event; Longitude of event; Lutetium; Niobium; Rubidium; Samarium; Sample code/label; Scandium; Strontium; Tantalum; Tellurium; Terbium; Thorium; Vanadium; Ytterbium; Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 140 data points
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  • 124
    Publication Date: 2023-07-10
    Keywords: Akademik Nikolaj Strakhov; ANS1; ANS1-18-D; Archive of Ocean Data; ARCOD; Central Atlantic; Cerium; Chromium; Cobalt; Dredge; DRG; Element analysis, neutron activation (NAA); Europium; Hafnium; Lanthanum; Lutetium; Niobium; Rubidium; Samarium; Sample code/label; Scandium; Strontium; Tantalum; Tellurium; Terbium; Thorium; Ytterbium; Yttrium; Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 100 data points
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  • 125
    facet.materialart.
    Unknown
    PANGAEA
    In:  P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow
    Publication Date: 2023-07-10
    Keywords: Akademik Mstislav Keldysh; AMK7; AMK7-786; Archive of Ocean Data; ARCOD; Braarudosphaera bigelowii; Ceratolithus cristatus; Chiasmolithus sp.; Coccoliths; Coccolithus pelagicus; Cretarhabdus crenulatus; Cyclococcolithus leptoporus; DEPTH, sediment/rock; Discoaster aulakos; Discoaster pentaradiatus; Discoaster trinidadensis; Discolithina japonica; Emiliania huxleyi; Epoch; Gephyrocapsa oceanica; Gephyrocapsa protohuxleyi; Gulf of Aden; Helicopontosphaera kamptneri; Microscopy; MULT; Multiple investigations; Nannofossil zone; Oolithotus antillarum; Prediscosphaera sp.; Rhabdosphaera clavigera; Scapholithus fossilis; Scyphosphaera apsteinii; Syracosphaera pulchra; Umbellosphaera tenuis; Umbilicosphaera mirabilis
    Type: Dataset
    Format: text/tab-separated-values, 575 data points
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  • 126
    Publication Date: 2023-07-10
    Keywords: Akademik Nikolaj Strakhov; ANS1; ANS1-18-D; ANS1-20-D; ANS1-28-T; Archive of Ocean Data; ARCOD; Central Atlantic; Cerium; Chromium; Cobalt; Dredge; DRG; Element analysis, neutron activation (NAA); Elevation of event; Elevation of event 2; Europium; Event label; GC; Gravity corer; Hafnium; Lanthanum; Latitude of event; Longitude of event; Lutetium; Niobium; Rubidium; Samarium; Sample code/label; Scandium; Strontium; Tantalum; Tellurium; Terbium; Thorium; Ytterbium; Yttrium; Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 80 data points
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  • 127
    Publication Date: 2023-07-10
    Keywords: 12-112; Blackites spinosus; Calcidiscus protoannulus; Cepekiella lumina; Chiasmolithus altus; Chiasmolithus expansus; Chiasmolithus oamaruensis; Chiasmolithus solitus; Coccolithus pelagicus; Coronocyclus nitescens; Craterolithus hoerstgensis; Cribrocentrum reticulatum; Cruciplacolithus cribellum; Cyclicargolithus abisectus; Cyclicargolithus floridanus; Deep Sea Drilling Project; Discoaster barbadiensis; Discoaster deflandrei; Discoaster saipanensis; Discoaster sublodoensis; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Ellipsolithus lajollaensis; Epoch; Ericsonia fenestrata; Ericsonia formosa; Glomar Challenger; Goniolithus fluckigeri; Helicosphaera bramlettei; Helicosphaera compacta; Helicosphaera perch-nielseniae; Helicosphaera recta; Helicosphaera seminulum; Helicosphaera sp.; Isthmolithus recurvus; Lanternithus minutus; Leg12; Markalius inversus; Nannofossil abundance; Nannofossils preservation; Nannofossil zone; Nannofossil Zone; Martini, 1971; Neococcolithes dubius; North Atlantic; Pedinocyclus larvalis; Pemma spp.; Pontosphaera multipora; Pontosphaera spp.; Pyrocyclus inversus; Pyrocyclus orangensis; Reticulofenestra bisecta; Reticulofenestra daviesii; Reticulofenestra dictyoda; Reticulofenestra lockeri; Reticulofenestra onusta; Reticulofenestra spp.; Reticulofenestra umbilicus; Rhabdosphaera inflata; Rhabdosphaera tenuis; Rhabdosphaera vitrea; Sample code/label; Sphenolithus moriformis; Sphenolithus predistentus; Sphenolithus radians; Striatococcolithus pacificanus; Toweius pertusus; Transversopontis pulcher; Transversopontis pulcheroides; Transversopontis sigmoidalis; Zygrhablithus bijugatus
    Type: Dataset
    Format: text/tab-separated-values, 1921 data points
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  • 128
    Publication Date: 2023-07-10
    Keywords: Ammodiscus lavidus; Ammodiscus pacificus; Ammotium planissimum; BC; Bolivina argentea; Bolivina minuta; Bolivina pacifica; Bolivina spissa; Box corer; Bulimina mexicana; Buliminella elegantissima; Buliminella tenuata; California Basins; Cancris inaequalis; Cassidulina delicata; Cassidulina laevigata; Cassidulina sp.; Chilostomella ovoidea; Cibicidoides fletcheri; Counting 〉125 µm fraction; Cribrostomoides advenum; Cribrostomoides aff. evolutum; Cribrostomoides evolutum; Cribrostomoides lenticulare; Cribrostomoides subglobosum; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Eggerella advena; Eggerella sp.; Ehrenbergina compressa; Epistominella smithi; Foraminifera, benthic indeterminata; Foraminifera, benthic living; Foraminifera, benthic specimens; Fursenkoina apertura; Fursenkoina bramletti; Fursenkoina delicatula; Fursenkoina seminuda; Globobulimina hoeglundi; Globobulimina pacifica; Globobulimina spinifera; Globocassidulina subglobosa; Gyroidina gemma; Hippocrepina sp.; Hoeglundina elegans; Lagena laevis; Loxostomum pseudobeyrichii; Nonionella fragilis; Nonionella stella; Nonion sp.; Nouria polymorphinoides; Planulina ariminensis; Pullenia salisburyi; Pyrgo murrhina; Quinqueloculina sp.; Reophax dentaliniformis; Reophax excentricus; Reophax horridus; Reophax scorpiurus; Reophax sp.; Rosalina columbiensis; Rotaliammina kelletae; Saccammina longicollis; SW_2b; Trochammina charlottensis; Trochammina globigeriniformis; Trochammina pacifica; Trochammina sp.; Uvigerina curticosta; Valvulineria araucana
    Type: Dataset
    Format: text/tab-separated-values, 260 data points
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  • 129
    Publication Date: 2023-07-10
    Keywords: 11-105; Ammodiscus granulosus; Aptychi abundance; Astacolus involvens; Astacolus sp.; Bigenerina arcuata; Deep Sea Drilling Project; Dentalina sp.; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Echinoidea spiculae; Eoguttulina oolithica; Epoch; Fish remains; Foraminifera, planktic abundance; Gaudryina mendrisiensis; Glomar Challenger; Glomospira variabilis; Glomospirella gaultina; Haplophragmium euides; Haplophragmoides sp.; Hyperammina gaultina; Leg11; Lenticulina diademata; Lenticulina quenstedti/ouachensis; Lenticulina saxonica; Lenticulina sp.; Lingulina loryi; Lithology/composition/facies; Marginulina minuta; Marginulina resupinata; Marginulinopsis antiquata; Marginulinopsis enodis; Marginulinopsis vetusta; Neobulimina minima; Nodosaria sp.; North Atlantic/HILL; Ostracoda; Palmula pseudoparallela; Praedorothia ouachensis; Protomarssonella kummi; Protomarssonella subtrochus; Pseudonodosaria humilis; Pyrulina cylindroides; Radiolarians abundance; Reophax helveticus; Reophax sp.; Sample code/label; Tristix acutangulus; Trochammina sp.; Vaginulina incurvata; Vaginulina riedeli; Vaginulina sp.; Valvulineria loetterlei; Verneuilinoides neocomiensis
    Type: Dataset
    Format: text/tab-separated-values, 720 data points
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  • 130
    Publication Date: 2023-07-10
    Keywords: 17-166; Astacolus erucaeformis; Astacolus sp.; Citharina sp.; Deep Sea Drilling Project; Dentalina sp.; DEPTH, sediment/rock; Dorothia conula; Dorothia kummi; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Epoch; Glomar Challenger; Glomospira variabilis; Glomospirella gaultina; Guttulina pygmaea; Haplophragmoides sp.; Hyperammina gaultina; Leg17; Lingulina loryi; Marginulinopsis vetusta; North Pacific/BASIN; Ostracoda; Palmula sp.; Praedorothia ouachensis; Radiolarians abundance; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 19 data points
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  • 131
    Publication Date: 2023-07-10
    Keywords: 11-101A; Ammodiscus cretaceus; Ammodiscus rugosus; Aptychi abundance; Astacolus sp.; Bigenerina sp.; Bullopora sp.; Conorotalites aptiensis; Deep Sea Drilling Project; Dentalina sp.; DEPTH, sediment/rock; Dorothia filiformis; Dorothia ouachensis; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Echinoidea spiculae; Epistomina carpenteri; Epoch; Fish remains; Gaudryina sp.; Gavelinella bettenstaedti; Globigerinelloides sp.; Glomar Challenger; Glomospira variabilis; Glomospirella gaultina; Haplophragmoides sp.; Hedbergella sp.; Hippocrepina sp.; Hyperammina gaultina; Ichthyolaria sp.; Jaculella depressa; Leg11; Lenticulina sp.; Lithology/composition/facies; Marginulina minuta; Marginulina resupinata; North Atlantic/RIDGE; Oolina sp.; Ostracoda; Pelosina complanata; Pleurostomella sp.; Psammosphaera sp.; Pseudonodosaria humilis; Pyrulina cylindroides; Radiolarians abundance; Ramulina spandeli; Recurvoides imperfectus; Reophax helveticus; Rhizammina dichotoma; Rotalipora sp.; Sample code/label; Schackoina sp.; Spirillina polygyrata; Spiroplectammina aequabilis; Spiroplectammina losangica; Textulariopsis sp.; Trochammina quinqueloba; Trochammina sp.; Trocholina sp.; Vaginulina denudata; Valvulineria loetterlei; Verneuilinoides neocomiensis
    Type: Dataset
    Format: text/tab-separated-values, 594 data points
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  • 132
    Publication Date: 2023-07-10
    Keywords: 62-463; Astacolus sp.; Deep Sea Drilling Project; Dentalina sp.; DEPTH, sediment/rock; Dorothia conula; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Echinoidea spiculae; Epoch; Gaudryina compacta; Gaudryina mendrisiensis; Gavelinella cenomanica; Gavelinella intermedia; Globigerinelloides sp.; Glomar Challenger; Glomospirella gaultina; Gubkinella graysonensis; Hedbergella sp.; Leg62; Lenticulina sp.; Lithology/composition/facies; Nodosaria sp.; North Pacific/SEAMOUNT; Osangularia brotzeni; Ostracoda; Palmula perovata; Palmula sp.; Pseudoclavulina gaultina; Pseudonodosaria humilis; Radiolarians abundance; Ramulina tappanae; Rotalipora sp.; Sample code/label; Spirillina polygyrata; Spiroplectammina gandolfii; Tritaxia tricarinata; Vaginulina sp.; Valvulineria loetterlei
    Type: Dataset
    Format: text/tab-separated-values, 864 data points
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  • 133
    Publication Date: 2023-07-10
    Keywords: 50-416A; Ammodiscus granulosus; Aptychi abundance; Astacolus calliopsis; Astacolus gratus; Astacolus multilatus; Astacolus parallelus; Astacolus sp.; Bigenerina jurassica; Citharina sp.; Conorboides pygmaea; Deep Sea Drilling Project; Dentalina distincta; Dentalina sp.; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Echinoidea spiculae; Eoguttulina oolithica; Epistomina caracolla; Epoch; Fish remains; Gastropoda; Glomar Challenger; Glomospira variabilis; Glomospirella gaultina; Guttulina subsphaerica; Haplophragmium euides; Hedbergella sp.; Hyperammina gaultina; Ichthyolaria pyrus; Jaculella depressa; Lagena hauteriviana; Lagenammina lagenaria; Leg50; Lenticulina quenstedti; Lenticulina sp.; Lingulina loryi; Lithology/composition/facies; Marginulina flaccida; Marginulinopsis matutina; Neobulimina atlantica; Nodosaria cf. prismatica; Nodosaria sceptrum; Nodosaria sp.; North Atlantic; Ophthalmidium rotula; Ophthalmidium strumosum; Ostracoda; Paalzowella feifeli; Palmula humilis; Palmula sp.; Praedorothia ouachensis; Pseudomarssonella dumortieri; Pseudonodosaria humilis; Pseudoreophax cisovnicensis; Pyrulina cylindroides; Radiolarians abundance; Ramulina spandeli; Reophax helveticus; Rhyncholitha; Sample code/label; Spirillina amphelicta; Spirillina polygyrata; Triloculina meotica; Tristix tunassica; Trochammina quinqueloba; Trochammina umiatensis; Vaginulina sp.
    Type: Dataset
    Format: text/tab-separated-values, 1830 data points
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  • 134
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: Shemesh, Aldo; Mortlock, Richard A; Froelich, Philip N (1989): Late Cenozoic Ge/Si record of marine biogenic opal: implications for variations of riverine fluxes to the ocean. Paleoceanography, 4(3), 221-234, https://doi.org/10.1029/PA004i003p00221
    Publication Date: 2023-10-04
    Description: We have determined germanium/silicon ratios in purified diatoms and radiolarians from siliceous sediments in Holocene core tops, one late Pleistocene piston core, and four high-latitude Southern Ocean Deep Sea Drilling Project (DSDP) sites ranging in age from Holocene to Oligocene. High-latitude Holocene diatoms in the 10- to 38-µm size fraction ([Ge/Si]opal = 0.693 +/- 0.039 * 10**-6) faithfully record the present oceanic ratio ([Ge/Si]seawater = 0.699 +/- 0.004 * 10**-6). This confirms that diatoms from siliceous oozes are monitors of seawater Ge/Si and may record past changes in rates of delivery of weathering products to the sea from continental and seafloor weathering. Large diatoms and radiolarians display ratios much lower than (Ge/Si)seawater, suggesting that (Ge/Si)opal, to some extent, displays the effects of biological fractionation. From 0 to 2.5 m.y.B.P., (Ge/Si)opal in diatoms from DSDP sites ranges from about 0.54 to 0.70 * 10**-6, similar to the range observed in one late Pleistocene piston core over the last 25 kyr. From 2.5 to 6 m.y.B.P., the ratio is more variable, while prior to 10 m.y.B.P., ratios are clearly higher, averaging about 0.9 * 10**-6 in the early to middle Miocene. Low values of the ratio are consistent with global weathering regimes dominated by river silica input to the sea, while higher ratios suggest periods of enhanced hydrothermal input or reduced fluvial contribution. Nevertheless, an oceanic one-box model with variable river and hydrothermal inputs and biogenic opal output cannot adequately account for the magnitude or the timing of changes observed in the record, suggesting the existence of other sources/sinks for inorganic germanium and/or silicon to or from the sea.
    Keywords: 28-265; 29-278; 71-513A; 71-514; Antarctic Ocean/BASIN; Antarctic Ocean/RIDGE; cruise 11; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; ELT11; ELT11-001-PC; ELT11-002-PC; ELT11-003-PC; ELT14; ELT14.005-PC; ELT15; ELT15.004-PC; ELT15.006-PC; ELT17; ELT17.009-PC; ELT17.017-PC; ELT17.029-PC; ELT17.030-PC; ELT45; ELT45.063-PC; ELT45.064-PC; ELT49; ELT49.006-PC; ELT49.008-PC; ELT49.033-PC; ELT50; ELT50.011-PC; ELT50.013-PC; ELT50.017-PC; Eltanin; Glomar Challenger; IO1176; IO1176.055-PC; IO1277; IO1277.010-PC; Islas Orcadas; Leg28; Leg29; Leg71; PC; Piston corer; RC11; RC1112; RC11-76; RC12; RC12-289; RC12-401; RC13; RC13-255; RC13-256; RC13-261; RC13-263; RC13-269; RC13-271; RC14; RC14-103; RC14-121; RC14-126; RC17; RC17-54; Robert Conrad; South Atlantic; South Atlantic/FLANK; Southern East Pacific Rise; V21; V21-156; V21-162; V29; V29-104; Vema
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 135
    Publication Date: 2023-10-04
    Keywords: Atomic absorption spectrometry, graphite furnace (GF-AAS); Coarse fraction/modal analysis; cruise 11; Cycladophora davisiana; DEPTH, sediment/rock; Elevation of event; ELT11; ELT11-001-PC; ELT11-002-PC; ELT11-003-PC; ELT14; ELT14.005-PC; ELT15; ELT15.004-PC; ELT15.006-PC; ELT17; ELT17.009-PC; ELT17.017-PC; ELT17.029-PC; ELT17.030-PC; ELT45; ELT45.063-PC; ELT45.064-PC; ELT49; ELT49.006-PC; ELT49.008-PC; ELT49.033-PC; ELT50; ELT50.011-PC; ELT50.013-PC; ELT50.017-PC; Eltanin; Event label; Germanium/Silica, biogenous opal ratio; IO1176; IO1176.055-PC; IO1277; IO1277.010-PC; Islas Orcadas; Latitude of event; Longitude of event; Opal, biogenic silica; Opal, extraction; Mortlock & Froelich, 1989; PC; Piston corer; Quaternary Environment of the Eurasian North; QUEEN; RC11; RC1112; RC11-76; RC12; RC12-289; RC12-401; RC13; RC13-255; RC13-256; RC13-261; RC13-263; RC13-269; RC13-271; RC14; RC14-103; RC14-121; RC14-126; RC17; RC17-54; Robert Conrad; Silicon; Silicon Cycling in the World Ocean; SINOPS; Southern East Pacific Rise; V21; V21-156; V21-162; V29; V29-104; Vema
    Type: Dataset
    Format: text/tab-separated-values, 143 data points
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  • 136
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Modern analog technique (MAT); PC; Piston corer; RC10; RC10-131; Robert Conrad; Sea surface temperature, summer; Sea surface temperature, winter
    Type: Dataset
    Format: text/tab-separated-values, 12 data points
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  • 137
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Globigerinoides sacculifer, δ13C; Globigerinoides sacculifer, δ18O; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Mass spectrometer VG SIRA 24; PC; Piston corer; RC10; RC10-131; Robert Conrad
    Type: Dataset
    Format: text/tab-separated-values, 56 data points
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  • 138
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Globigerinoides sacculifer, δ13C; Globigerinoides sacculifer, δ18O; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Mass spectrometer VG SIRA 24; PC; Piston corer; V24; V24-161; Vema
    Type: Dataset
    Format: text/tab-separated-values, 56 data points
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  • 139
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    In:  Supplement to: Mackensen, Andreas; Douglas, Robert G (1989): Down-core distribution of live and dead deep-water benthic foraminifera in box cores from the Weddell Sea and the California continental borderland. Deep-Sea Research Part A. Oceanographic Research Papers, 36(6), 879-900, https://doi.org/10.1016/0198-0149(89)90034-4
    Publication Date: 2023-12-12
    Description: Five short cores sub-sampled from box cores from three sites in the eastern Weddell Sea off Antarctica and in the eastern Pacific off southern California, covering a range in water depth from 500 to 2000 m, were analysed for the down-core distribution of live (stained with Rose Bengal) and dead benthic foraminifera. In the California continental borderland, Planulina ariminensis, Rosalina columbiensis and Trochammina spp. live attached to agglutinated polychaetes tubes that rise above the sedimentwater interface. Bolivina spissa lives exclusively in or on the uppermost sediment. Stained specimens of Chilostomella ovoidea are found down to 6 cm within the sediment and specimens of Globobulimina pacifica down to a maximum of 8 cm. Delta13C values of live G. pacifica decrease with increasing depth from the sediment surface down to 7 cm core depth, indicating that this infaunal species utilizes13C-depleted carbon from pore waters. In the dead, predominantly calcareous benthic forminiferal assemblage, selective dissolution of small delicate tests in the upper sediment column causes a continuous variation in species proportions. In the eastern Weddell Sea, the calcareous Bulimina aculeata lives in a carbonate corrosive environment exclusively in or on the uppermost sediment. The arenaceous Cribrostomoides subglobosum, Recurvoides contortus and some Reophax species are frequently found within the top 4 cm of the sediment, whereas stained specimens of Haplophragmoides bradyi, Glomospira charoides and Cribrostomoides wiesneri occur in maximum abundance below the uppermost 1.5 cm. Species proportions in the dead, predominantly arenaceous, benthic foraminiferal assemblage change in three distinct steps. The first change is caused by calcite dissolution at the sediment-water interface, the second coincides with the lower boundary of intense bioturbation, and the third results from the geochemical shift from oxidizing to reducing conditions below a compacted ash layer.
    Keywords: ANT-IV/3; Atka Bay; AWI_Paleo; BC; Box corer; California Basins; Giant box corer; GKG; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS08; PS08/374; PS1394-1; PS1394-3; SW_2b; SW_3a; SW_3b
    Type: Dataset
    Format: application/zip, 7 datasets
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  • 140
    Publication Date: 2023-11-25
    Keywords: 94-606_Site; Atlantic Ocean; Cadmium/Calcium ratio; CEPAG; CH67-19; CH69-32; CH69-69; CH6X; CH70-K11; CH72-101; CH72-104; CH73-110; CH73-136; CH73-139; CH73-139C; CH77-07; CH7X; CH8X; CHN82-04; CHN82-15; CHN82-20; COMPCORE; Composite Core; Core; CORE; DEPTH, sediment/rock; Elevation of event; Event label; Fram-I; FramI/7; FramII/4; GC; GEOGAS; Glomar Challenger; Gravity corer; Gravity corer (Kiel type); HU75-41; HU75-42; Ice drift station; Jean Charcot; Keigwin_31-33; KN708-1; KN708-6; KN714-15; Latitude of event; Leg94; Le Noroit; Le Suroît; Longitude of event; Neogloboquadrina pachyderma sinistral, δ13C; Neogloboquadrina pachyderma sinistral, δ18O; NO77/79; NO79-06; North Atlantic; North Atlantic/FLANK; PC; Piston corer; RC09; RC09-225; Reference/source; Robert Conrad; ROMANCHA; Sea surface temperature, August; Sea surface temperature, February; SL; SU81-47; V23; V23-23; V23-42; V23-81; V23-82; V23-83; V27; V27-114; V27-116; V27-17; V27-19; V27-20; V27-60; V27-86; V28; V28-14; V28-56; V29; V29-177; V29-178; V29-179; V29-180; V29-183; V29-206; V30; V30-101; V30-108; V30-96; V30-97; Vema
    Type: Dataset
    Format: text/tab-separated-values, 180 data points
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  • 141
    Publication Date: 2023-12-02
    Keywords: Calcium carbonate; DEPTH, sediment/rock; Element analysis, Vacuum-gasometric (Jones & Kaiteris, 1983); Lamont-Doherty Earth Observatory, Columbia University; LDEO; PC; Piston corer; V24; V24-161; Vema
    Type: Dataset
    Format: text/tab-separated-values, 25 data points
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  • 142
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Modern analog technique (MAT); PC; Piston corer; Sea surface temperature, summer; Sea surface temperature, winter; V24; V24-170; Vema
    Type: Dataset
    Format: text/tab-separated-values, 8 data points
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  • 143
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Globigerinoides sacculifer, δ13C; Globigerinoides sacculifer, δ18O; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Mass spectrometer VG SIRA 24; PC; Piston corer; RC12; RC12-113; Robert Conrad
    Type: Dataset
    Format: text/tab-separated-values, 48 data points
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  • 144
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Globigerinoides sacculifer, δ13C; Globigerinoides sacculifer, δ18O; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Mass spectrometer VG SIRA 24; PC; Piston corer; V24; V24-166; Vema
    Type: Dataset
    Format: text/tab-separated-values, 30 data points
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  • 145
    Publication Date: 2023-12-02
    Keywords: Calcium carbonate; DEPTH, sediment/rock; Element analysis, Vacuum-gasometric (Jones & Kaiteris, 1983); Lamont-Doherty Earth Observatory, Columbia University; LDEO; PC; Piston corer; RC10; RC10-131; Robert Conrad
    Type: Dataset
    Format: text/tab-separated-values, 25 data points
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  • 146
    Publication Date: 2023-12-02
    Keywords: Calcium carbonate; DEPTH, sediment/rock; Element analysis, Vacuum-gasometric (Jones & Kaiteris, 1983); Lamont-Doherty Earth Observatory, Columbia University; LDEO; PC; Piston corer; V24; V24-170; Vema
    Type: Dataset
    Format: text/tab-separated-values, 26 data points
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  • 147
    Publication Date: 2023-12-02
    Keywords: Calcium carbonate; DEPTH, sediment/rock; Element analysis, Vacuum-gasometric (Jones & Kaiteris, 1983); Lamont-Doherty Earth Observatory, Columbia University; LDEO; PC; Piston corer; V24; V24-184; Vema
    Type: Dataset
    Format: text/tab-separated-values, 25 data points
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  • 148
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Modern analog technique (MAT); PC; Piston corer; RC12; RC12-109; Robert Conrad; Sea surface temperature, summer; Sea surface temperature, winter
    Type: Dataset
    Format: text/tab-separated-values, 12 data points
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  • 149
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Modern analog technique (MAT); PC; Piston corer; Sea surface temperature, summer; Sea surface temperature, winter; V24; V24-157; Vema
    Type: Dataset
    Format: text/tab-separated-values, 10 data points
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  • 150
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Modern analog technique (MAT); PC; Piston corer; Sea surface temperature, summer; Sea surface temperature, winter; V24; V24-161; Vema
    Type: Dataset
    Format: text/tab-separated-values, 10 data points
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  • 151
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Modern analog technique (MAT); PC; Piston corer; Sea surface temperature, summer; Sea surface temperature, winter; V24; V24-184; Vema
    Type: Dataset
    Format: text/tab-separated-values, 8 data points
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  • 152
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Globigerinoides sacculifer, δ13C; Globigerinoides sacculifer, δ18O; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Mass spectrometer VG SIRA 24; PC; Piston corer; V24; V24-157; Vema
    Type: Dataset
    Format: text/tab-separated-values, 40 data points
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  • 153
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Modern analog technique (MAT); PC; Piston corer; RC09; RC09-124; Robert Conrad; Sea surface temperature, August; Sea surface temperature, February
    Type: Dataset
    Format: text/tab-separated-values, 2 data points
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  • 154
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Globigerinoides sacculifer, δ13C; Globigerinoides sacculifer, δ18O; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Mass spectrometer VG SIRA 24; PC; Piston corer; V24; V24-184; Vema
    Type: Dataset
    Format: text/tab-separated-values, 76 data points
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  • 155
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Modern analog technique (MAT); PC; Piston corer; RC09; RC09-126; Robert Conrad; Sea surface temperature, August; Sea surface temperature, February
    Type: Dataset
    Format: text/tab-separated-values, 2 data points
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  • 156
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    PANGAEA
    In:  Supplement to: Anderson, David M; Prell, Warren L; Barratt, N J (1989): Estimates of sea surface temperature in the Coral Sea at the last glacial Maximum. Paleoceanography, 4(6), 615-627, https://doi.org/10.1029/PA004i006p00615
    Publication Date: 2023-12-02
    Description: The CLIMAP [1981] reconstruction of the Coral Sea found relatively little cooling (2°C) in the low latitudes (10°S) but a warming off Australia at about 25°S. The small low-latitude changes are of interest because terrestrial pollen and snowline data from the New Guinea highlands imply that surface temperatures may have been 6° to 9°C colder at the last glacial maximum (LGM). The purpose of this paper is to evaluate these conclusions on the basis of additional core sites, new oxygen isotope stratigraphy, and new sea surface temperature (SST) estimates using the modern analog technique (MAT). In the northern Coral Sea, planktonic foraminifer assemblages consist of tropical-subtropical species that show little change over the past 20 kyr. Quantitative estimates of SST using the modern analog technique (MAT) confirm the CLIMAP [1981] conclusion that little or no temperature change occurred in this tropical region at the LGM, thus reinforcing the conflict with terrestrial evidence. In the southern region (25°S), two cores indicate that foraminifer faunas became more subtropical at the LGM. The MAT estimates for the LGM are 3° to 4°C colder than modern, producing a steeper thermal gradient in the southern Coral Sea. These data remove the warm SST anomaly along the eastern coast of Australia and indicate that during the LGM, cool high- latitude waters were displaced northward along the coast of Australia into the southern Coral Sea.
    Keywords: Lamont-Doherty Earth Observatory, Columbia University; LDEO; PC; Piston corer; RC09; RC09-124; RC09-126; RC10; RC10-131; RC12; RC12-107; RC12-109; RC12-113; Robert Conrad; V24; V24-157; V24-161; V24-166; V24-170; V24-184; Vema
    Type: Dataset
    Format: application/zip, 22 datasets
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  • 157
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Modern analog technique (MAT); PC; Piston corer; RC12; RC12-113; Robert Conrad; Sea surface temperature, summer; Sea surface temperature, winter
    Type: Dataset
    Format: text/tab-separated-values, 12 data points
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  • 158
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Globigerinoides sacculifer, δ13C; Globigerinoides sacculifer, δ18O; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Mass spectrometer VG SIRA 24; PC; Piston corer; RC12; RC12-109; Robert Conrad
    Type: Dataset
    Format: text/tab-separated-values, 48 data points
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  • 159
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Globigerinoides sacculifer, δ13C; Globigerinoides sacculifer, δ18O; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Mass spectrometer VG SIRA 24; PC; Piston corer; V24; V24-170; Vema
    Type: Dataset
    Format: text/tab-separated-values, 74 data points
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  • 160
    Publication Date: 2023-12-02
    Keywords: DEPTH, sediment/rock; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Modern analog technique (MAT); PC; Piston corer; RC12; RC12-107; Robert Conrad; Sea surface temperature, August; Sea surface temperature, February
    Type: Dataset
    Format: text/tab-separated-values, 2 data points
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  • 161
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    In:  Supplement to: Shackleton, Nicholas J; Hall, Michael A (1989): Stable isotope history of the Pleistocene at ODP Site 677. In: Becker, K; Sakai, H; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Programm), 111, 295-316, https://doi.org/10.2973/odp.proc.sr.111.150.1989
    Publication Date: 2024-01-09
    Description: Oxygen and carbon isotope ratio measurements are presented for Globigerinoides ruber and for benthic species (mainly Uvigerina spp.) in the Pleistocene and uppermost Pliocene section of ODP Hole 677A in the Panama Basin. This provides the best available continuous Pleistocene stable isotope records from any location, fully justifying the recoring of DSDP Site 504. Oxygen isotope stage 22 (age about 0.85 Ma) was of similar magnitude to the most extensive glacials of the Brunhes and constitutes a logical base for the middle Pleistocene. Oxygen isotope stages as defined by Ruddiman et al. (1986, doi:10.1016/0012-821X(86)90024-5) and by Raymo et al. (1989, doi:10.1029/PA004i004p00413) back to stage 104 are recognized. Although the internationally agreed base of the Quaternary at or near stage 62 (about 1.6 Ma) is not marked by a major isotopic event, it does approximate the base of a regime characterized by highly regular 41,000-yr climate cycles. The records at Site 677 are ideal for time-series analyses and will permit a new attempt to develop a chronology for the early Pleistocene based on tuning to the orbital frequencies. The carbon isotope records also appear to contain considerable variance at orbital frequencies throughout the sequence analyzed.
    Keywords: 111-677A; 111-677B; DRILL; Drilling/drill rig; Joides Resolution; Leg111; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 162
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    In:  Supplement to: Clement, Bradford M; Hall, Frank R; Jarrard, Richard D (1989): The magnetostratigraphy of Ocean Drilliing Program Leg 105 sediments. In: Srivastava, SP; Arthur, M; Clement, B; et al., (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 583-596, https://doi.org/10.2973/odp.proc.sr.105.147.1989
    Publication Date: 2024-01-09
    Description: During Leg 105 of the Ocean Drilling Program, a series of 11 holes was drilled at three sites along a north-south transect in Baffin Bay and the Labrador Sea. Intermittent recovery and drilling disturbance, resulting in part from the harsh weather conditions encountered, hampered magnetostratigraphic study. In particular, incomplete recovery of undisturbed sediment and sparse biostratigraphic control make it difficult to correlate the polarity zones observed in sediments recovered at Site 645 in Baffin Bay with the geomagnetic polarity time scale. However, the undisturbed Pliocene-Pleistocene sediments recovered using the advanced piston corer (APC) at Sites 646 and 647 yield polarity sequences that are readily correlated with the time scale. Deeper sequences cored using the extended core barrel (XCB) corer at Site 646 provide a coarse polarity sequence that, in conjunction with the available biostratigraphic data, may be correlated tentatively with late Miocene reversal sequences. The polarity record obtained from a relatively undisturbed upper Eocene sequence recovered from Hole 647A using the rotary core barrel (RCB) is correlated with Chronozones C19 through C18.
    Keywords: 105-646A; 105-646B; 105-647A; 105-647B; DRILL; Drilling/drill rig; Joides Resolution; Labrador Sea; Leg105; Ocean Drilling Program; ODP; South Atlantic Ocean
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 163
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    In:  Supplement to: Hall, Frank R; Bloemendal, Jan; King, John W; Arthur, Michael A; Aksu, Ali E (1989): Middle to late Quaternary sediment fluxes in the Labrador Sea. ODP LEg 105, Site 646: a synthesis of rock-magnetic, oxygen-isotopic, carbonate, and planktonic foraminiferal data. In: Srivastava, SP; Arthur, M; Clement, B; et al., (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 653-688, https://doi.org/10.2973/odp.proc.sr.105.177.1989
    Publication Date: 2024-01-09
    Description: We examine rock-magnetic, carbonate, and planktonic foraminiferal fluxes to identify climatically controlled changes of terrigenous and pelagic sedimentation at Ocean Drilling Program (ODP) Site 646 (the Labrador Sea). Terrigenous sediments are brought to the site principally by bottom currents. We use a rock-magnetic parameter sensitive to changes in magnetic mineral grain size, the ratio of anhysteretic susceptibility to low-field magnetic susceptibility (XARM/X), to monitor changes in bottom-current intensity over time, with large values of XARM/X (finer-grained magnetic minerals) indicating weaker bottom currents. A second rock-magnetic parameter, magnetic mineral accumulation rate (KaT) was used to indicate variations in terrigenous flux. Planktonic foraminiferal and carbonate accumulation rates (Pfar and CaC03ar) are used as indicators of pelagic flux. Absolute age assignments are based on correlation between the planktonic foraminiferal oxygen-isotope variations for Site 646 and the SPECMAP master oxygen-isotope curve. Cross-correlation analyses of the parameters that we studied with respect to the SPECMAP curve suggest that from oxygen-isotope stages 21 to 11, sedimentation rate, KaT, X, CaCO3ar, and Pfar were at their maximums, whereas XARM/X was at its minimum during peak interglacials (i.e., 0 k.y. lag time with respect to minimum ice volume). However, all parameters we examined lag behind minimum ice volume from stages 11 to 1, indicating a change in timing of both pelagic and terrigenous fluxes at approximately 400 k.y. BP. The negative correlation coefficient between XARM/X and the SPECMAP curve further suggest that finer-grained magnetic minerals are deposited during glacial periods, which probably reflects weaker bottom currents. The shift observed in the lag times of parameters examined with respect to the SPECMAP record is attributed to a change in significance of orbital parameters. Spectral results exhibit strong power in eccentricity (about 100 k.y.) throughout the record. Kap X, CaCO3flr, and Pfar show significant power in obliquity (about 41 k.y.), whereas XARM/X shows significant power at 73 k.y. from stages 21 to 11. The 73-k.y. period in XARM/X is near the difference tone of obliquity and eccentricity: 1/43-1/102 = 1/69. Kar and XARM/X show power only in eccentricity from stages 11 to 1. X and Pfar show significant power in precession (about 18 and 22 k.y.) whereas CaC03ar has power at 34 k.y, which could be a combination of precession and obliquity. The shift in power of orbital parameters may by attributed to the effect of the about 413-k.y. signal of eccentricity.
    Keywords: 105-646; 105-646A; 105-646B; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Labrador Sea; Leg105; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 164
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    In:  Supplement to: Kaminski, Michael Anthony; Gradstein, Felix M; Scott, David B; Mackinnon, K D (1989): Neogene benthic foraminifer biostratigraphy and deep-water history of sites 645,646, and 647, Baffin Bay and Labrador Sea. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 731-756, https://doi.org/10.2973/odp.proc.sr.105.123.1989
    Publication Date: 2024-01-09
    Description: Benthic foraminifers were examined from Neogene sediments of Ocean Drilling Program (ODP) Sites 645, 646, and 647 to determine their biostratigraphy and to place constraints on the paleoceanographic history of Baffin Bay, Eirik Ridge, and the Gloria Drift. At Site 645 in Baffin Bay, a Pleistocene Stetsonia assemblage is similar to the modern Baffin Bay assemblage, but an underlying Epistominella takayanagii assemblage has no modern analog. Miocene assemblages below a barren interval display low diversity and consist mainly of agglutinated species. At Site 646 in the Labrador Sea, benthic faunal turnovers occur near important seismic horizons. A Miocene Nuttallides umbonifera assemblage similar to assemblages at other North Atlantic sites occurs below reflector R3. Above reflector R3, a coarse agglutinated assemblage containing more diversified calcareous benthic foraminifers was found that displays affinity to assemblages in the Norwegian-Greenland Sea. The faunal turnover near reflector R3 was interpreted as reflecting the onset (or renewal) of significant Denmark Straits Overflow Water at Site 646 at ~7.5 Ma, Agglutinated species disappear between reflector R2 and the base of the sediment drift, indicating a change in deep-water properties that occurred at ~ 4.7 Ma. This turnover ultimately may be linked to the reopening of the Mediterranean. The beginning of drift sedimentation at the Eirik Ridge is dated at --4.5 Ma. Drift formation ceased at ~2.5 Ma, concomitant with the appearance of ice-rafted sediments. Pleistocene assemblages containing Stetsonia horvathi display affinity to deep assemblages in high-latitude ocean basins. Upper Pliocene and Pleistocene benthic assemblages at Site 647 contain N. umbonifera, which indicates a continued influence of corrosive deep water at the Gloria Drift.
    Keywords: 105-645B; 105-646A; 105-646B; 105-647B; Baffin Bay; DRILL; Drilling/drill rig; Joides Resolution; Labrador Sea; Leg105; Ocean Drilling Program; ODP; South Atlantic Ocean
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  • 165
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    In:  Supplement to: Cremer, Michel; Legigan, Philippe (1989): Morphology and surface texture of quartz grains from ODP Site 645, Baffin Bay. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 21-30, https://doi.org/10.2973/odp.proc.sr.105.112.1989
    Publication Date: 2024-01-09
    Description: The shapes and surface textures of sand-sized quartz grains from the sediments cored at Site 645 in southern Baffin Bay during ODP Leg 105 were studied to characterize the terrigenous materials and the settling processes involved in the deposition of these sediments. Here, we show a homogeneous sand fraction that results from mixing grains from various provenances. The characteristics inherited from terrestrial processes (varying degrees of wear; fluviatile, aeolian, and diagenetic features) dominate the characteristics that result from evolution in a high-energy marine environment. Thus, the influence of the last stage of sedimentation in a deep-marine environment was difficult to distinguish. However, fluctuations in the relative proportions of particular features reveal that the terrigenous material derived from sedimentary formations of Baffin Island and East Greenland or from direct abrasion of the crystalline shield, which changed through time as the dominant settling processes evolved. In particular, this study confirms the onset of major ice rafting as old as late Miocene.
    Keywords: 105-645; 105-645B; 105-645D; 105-645E; Baffin Bay; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg105; Ocean Drilling Program; ODP
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  • 166
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    In:  Supplement to: de Vernal, Anne; Mudie, Peta J (1989): Pliocene and Pleistocene palynostratigraphy at ODP Sites 646 and 647, eastern and southern Labrador Sea. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 401-422, https://doi.org/10.2973/odp.proc.sr.105.134.1989
    Publication Date: 2024-01-09
    Description: Pliocene and Pleistocene sediments from ODP Hole 647A in the south central Labrador Sea and Hole 646B off southwest Greenland were sampled at 1.5-m intervals for studies of terrestrial and marine palynomorphs, including pollen, spores, dinocysts, and acritarchs. The dinocyst assemblages suggest that surface-water masses were cool-temperate to subarctic during most of the Pliocene and Pleistocene. The occurrence of a few warm-temperate indicators, notably Impagidinium species and Polyspaeridium zoharyi, suggests almost continuous northward advection of warm North Atlantic Drift into the Labrador Sea. A major decrease in dinocyst diversity and abundance marks the late Pliocene to early Pleistocene interval. The abundance of acritarchs in Pliocene sediments off southwest Greenland suggests high productivity, which may reflect nutrient flux from the shelf or upwelling; productivity appears to have been much lower at the central Labrador Sea site. Pollen and spore concentrations also decrease from the late Pliocene to early Pleistocene. This diminution probably reflects the impoverishment of vegetation and southward migration of the eastern Canadian tree line at the onset of climatic cooling and glaciation.
    Keywords: 105-646B; 105-647A; DRILL; Drilling/drill rig; Joides Resolution; Labrador Sea; Leg105; Ocean Drilling Program; ODP; South Atlantic Ocean
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  • 167
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    In:  Supplement to: Knüttel, Stephen; Russell, Merlin D Jr; Firth, John V (1989): Neogene calcareous nannofossils from ODP Leg 105: implications for Pleistocene paleoceanographic trends. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 245-262, https://doi.org/10.2973/odp.proc.sr.105.130.1989
    Publication Date: 2024-01-09
    Description: Neogene calcareous nannofossils were examined from 10 holes at three sites cored during ODP Leg 105. Sediment recovered in Baffin Bay at Site 645 is virtually barren of calcareous nannofossils, with the exception of a sparse lower Miocene assemblage. Sites 646 and 647 in the Labrador Sea contain upper Miocene to Holocene sediments having numerous barren intervals. Upper Pleistocene fossil coccolithophorid floras in the Labrador Sea indicate alternations of cold subpolar with transitional (subpolar/subtropical) assemblages. Extreme variations in the abundance of Coccolithus pelagicus were observed at Sites 646 and 647. These variations are correlated with stable isotopic data to interpret oceanographic responses to warming and cooling trends. The climatic history indicated by the changes of these assemblages closely approximates the past climatic fluctuations recorded in other North Atlantic cores. One new taxon, Discoaster bergenii, is described.
    Keywords: 105-646A; 105-646B; 105-647A; DRILL; Drilling/drill rig; Joides Resolution; Labrador Sea; Leg105; Ocean Drilling Program; ODP; South Atlantic Ocean
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  • 168
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    In:  Supplement to: Hillaire-Marcel, Claude; de Vernal, Anne; Aksu, Ali E; Macko, Stephen A (1989): High-resolution isotopic and micropaleontological studies of Upper Pleistocene sediments at ODP Site 645, Baffin Bay. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 599-616, https://doi.org/10.2973/odp.proc.sr.105.138.1989
    Publication Date: 2024-01-09
    Description: The oxygen and carbon isotopic compositions of the planktonic foraminifer, Neogloboquadrina pachyderma (sinistral), were determined at 20-cm intervals through the 'composite' top ~ 22 m of sediments at ODP Site 645 (Holes 645B, 645C, 645F, and 645G) and at 10-cm intervals through a 9-m piston core (85-027-016) collected during the Hudson site survey. Quantitative analyses of palynomorphs, notably dinocysts, and of planktonic foraminifers were performed. Organic and nitrogen contents and isotopic composition of nitrogen and carbon in organic matter also were determined. These data provide a high-resolution record of changes that occurred in surface-water masses during the last glacial cycle in Baffin Bay. The basin experienced low planktonic productivity during most of the late Pleistocene, either from dilution in surface water by meltwater discharges from the surrounding ice-sheet or from the presence of a relatively dense sea-ice cover. Peaks of meltwater discharge are indicated by d18O values as low as about 1.5 per mil, correlative d13C- d18O shifts, low concentration of planktonic foraminifers, high concentrations of glacially reworked pre-Quaternary palynomorphs, and low-salinity dinocyst assemblages. As a whole, d18O values ranging between 4.5 and 2.5 per mil allow the establishment of an 18O stratigraphy spanning isotopic stages 5 to 1. Because of the poor core recovery, the general paucity of microflora and microfauna, and the possible occurrence of slumping or debris flow at Site 645, further interpretation remains problematic.
    Keywords: 105-645; Baffin Bay; COMPCORE; Composite Core; HUD76-029-033; HUD85-027-16; HUD85-027-16TC; Hudson Bay; Joides Resolution; Labrador Sea; Leg105; Ocean Drilling Program; ODP; PC; Piston corer; TC; Trigger corer
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  • 169
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    In:  Supplement to: Causse, Christiane; Vörösmarty, Charles J (1989): Thorium and uranium isotopes in Upper Pleistocene sediments of ODP Sites 645 (Baffin Bay), 646, and 647 (Labrador Sea). In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 551-560, https://doi.org/10.2973/odp.proc.sr.105.155.1989
    Publication Date: 2024-01-09
    Description: Concentrations and activity ratios of uranium and thorium isotopes (234U/238U, 230Th/232Th) were determined at about 5-m intervals through the composite top 22-m sequence of Ocean Drilling Program (ODP) Hole 645 in Baffin Bay and, in the Labrador Sea, at 1-m intervals through the top 11 m of Core 84-030-003 (TWC and P) collected by the Hudson during a preliminary survey of Site 647, and also at about 2-m intervals through the composite top 22-m sequence of Hole 646. In the Labrador Sea, surficial sediments show unsupported 230Th having a 230Th/234U activity ratio of about 3. At Site 647, a regular decrease in the 230Th/232Th activity ratio was observed downcore from about 1.2 (at 1 mbsf) to about 0.4 (at ~8 mbsf), through a sequence spanning over 18O stages 2 through 8. The correlative thorium/uranium chronology and 18O stratigraphy indicate relatively constant sedimentation rates throughout the sequence. At Site 646, down Greenland slope, and at Site 645, in Baffin Bay, highly variable uranium and thorium concentrations and isotopic ratios were observed in relation to highly variable sedimentation rates. As a whole, the lower-excess observed in Baffin Bay records is indicative of very high absolute sedimentation rates in comparison with those of the Labrador Sea. These rates are confirmed by the 18O-stratigraphy and a few AMS 14C controls on handpicked foraminifers. At both Labrador Sea sites, a clear indication of an initial 230Th-excess (over the 230Th-rain from the water column) was found.
    Keywords: 105-645; 105-646B; Baffin Bay; COMPCORE; Composite Core; DRILL; Drilling/drill rig; HUD85-027-16; HUD85-027-16TC; Joides Resolution; Labrador Sea; Leg105; Ocean Drilling Program; ODP; PC; Piston corer; TC; Trigger corer
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  • 170
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    In:  Supplement to: Baldauf, Jack G; Clement, Bradford M; Aksu, Ali E; de Vernal, Anne; Firth, John V; Hall, Frank R; Head, Martin J; Jarrard, Richard D; Kaminski, Michael Anthony; Lazarus, David B; Monjanel, Anne-Lise; Berggren, William A; Gradstein, Felix M; Knüttel, Stephen; Mudie, Peta J; Russell, Merlin D Jr (1989): Magnetostratigraphic and biostratigraphic synthesis of Ocean Drilling Program Leg 105: Labrador Sea and Baffin Bay. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 935-956, https://doi.org/10.2973/odp.proc.sr.105.165.1989
    Publication Date: 2024-01-09
    Description: During Ocean Drilling Program (ODP) Leg 105, three sites (Sites 645 through 647) were drilled in Baffin Bay and the Labrador Sea to examine the tectonic evolution and the climatic and oceanic histories of this region. Biostratigraphic and magnetostratigraphic results vary at each site, while stratigraphic resolution depends on the limited abundance of marker species and the completeness of the paleomagnetic record. Because of the paucity of planktonic microfossils and the poor paleomagnetic record signatures, stratigraphic determinations at Site 645 often rely on defining minimum temporal constraints on specific samples or stratigraphic intervals. The completed stratigraphy indicates that the sedimentary sequence recovered at Site 645 is early Miocene to Holocene in age. The magnetostratigraphy and biostratigraphies are better defined at Sites 646 and 647 in the Labrador Sea. Site 646 generally contains a well-developed magnetostratigraphy and calcareous microfossil biostratigraphy. This biostratigraphy is based on calcareous nannofossils and planktonic foraminifers typical of the North Atlantic Ocean. Siliceous microfossils are also present at Site 646, but they are restricted to upper Pliocene through Holocene sediments. The stratigraphic sequence recovered at Site 646 is late Miocene to Holocene in age. Based primarily on the calcareous nannofossil stratigraphy, the sequence recovered at Site 647 consists of lower Eocene to lower Oligocene, lower Miocene, upper Miocene, and upper Pliocene through Holocene sediments. Three hiatuses are present in this sequence: the older hiatus separates lower Oligocene sediments from lower Miocene sediments, another hiatus separates lower Miocene sediments from upper Miocene sediments, and the youngest one separates upper Miocene from upper Pliocene sediments. A magnetostratigraphy is defined for the interval from the Gauss/Matuyama boundary through the Brunhes (Clement et al., this volume). Both planktonic foraminifers and siliceous microfossils have restricted occurrences. Planktonic foraminifers occur in Pliocene and younger sediments, and siliceous microfossils are present in lower Miocene and lower Oligocene sediments. The near-continuous Eocene through lower Oligocene sequence recovered at Site 647 allows the calcareous nannofossils and diatom stratigraphies at this site to act as a Paleogene stratigraphic framework. This framework can be compared with the stratigraphy previously completed for DSDP Site 112.
    Keywords: 105-646; 105-647; 12-112; COMPCORE; Composite Core; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Joides Resolution; Labrador Sea; Leg105; Leg12; North Atlantic; Ocean Drilling Program; ODP; South Atlantic Ocean
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  • 171
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    In:  Supplement to: Cremer, Michel; Maillet, Noelle; Latouche, Claude (1989): Analysis of sedimentary facies and clay mineralogy of the Neogene-Quaternary sediments in ODP Site 646, Labrador Sea. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 71-81, https://doi.org/10.2973/odp.proc.sr.105.114.1989
    Publication Date: 2024-01-09
    Description: The grain-size study and analyses of bulk sediment and clay mineral composition of samples collected from the dominant lithologies recovered at ODP Site 646, located on the northern flank of the Eirik Ridge (Labrador Sea), show variations indicating that contour-following currents, linked to Norwegian Sea Overflow Water (NSOW), have controlled sedimentation since the early Pliocene. These currents were influential until the early Pleistocene, despite the onset of major ice-rafting at about 2.5 Ma. A major mineralogical change occurred during the late Miocene: a decrease in the smectite to illite and chlorite ratio and a decrease of the crystallinity of smectites. This change indicates a renewing of the source rocks, which could result from an important hydrological change at this time. This change also is depicted by grain-size data that suggest the bottom current influence should be set earlier than the Pliocene.
    Keywords: 105-646A; 105-646B; DRILL; Drilling/drill rig; Joides Resolution; Labrador Sea; Leg105; Ocean Drilling Program; ODP
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  • 172
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    In:  Supplement to: Aagaard, Per; Egeberg, Per Kristian; Smalley, P Craig (1989): Diagenetic reactions in Leg 104 sediments inferred from isotope and major element chemistry of interstitial waters. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 273-280, https://doi.org/10.2973/odp.proc.sr.104.122.1989
    Publication Date: 2024-01-09
    Description: The variations in major elements and isotope composition (87Sr/86Sr, delta18O, deltaD) of interstitial waters in Leg 104 sediments is most probably caused by the alteration of volcanic matter. A reaction scheme where volcanic glass reacts with pore-water magnesium and potassium to form trioctahedral smectite, phillipsite, and chert is proposed. Model calculations demonstrate that the pore waters may evolve their negative 6180 signatures without recourse to unreasonably large amounts of volcanic detritus or external sources.
    Keywords: 104-642; 104-643; 104-644; COMPCORE; Composite Core; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
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  • 173
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    In:  Supplement to: Vuletich, April K; Threlkeld, Charles N; Claypool, George E (1989): Isotopic composition of gases and interstitial fluids in sediment of the Vøring Plateau, ODP Leg 104, Site 644. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 281-283, https://doi.org/10.2973/odp.proc.sr.104.199.1989
    Publication Date: 2024-01-09
    Description: Pleistocene- to middle Miocene-age sediment was drilled at Site 341 (67 infinity 20.1'N, 6 infinity 06.6'E) on the inner Voring Plateau during Leg 38 of the Deep Sea Drilling Project (DSDP). In 1985, the Ocean Drilling Program (ODP) returned to the inner Wring Plateau near Site 341 and drilled a new hole at Site 644 (66° 40.7'N, 4° 34.6'E) as part of a transect to study Norwegian Sea paleoenvironments. In Hole 341, gas expansion pockets formed in cores which were recovered from depths below 50 m. This gas was characterized as predominantly methane with delta13C values in the range of -87 to -77 per mil (Morris, 1976, doi:10.2973/dsdp.proc.38.124.1976). At Site 644, sediment gas and pore-water samples were obtained to study the geochemistry of methanogenesis. Of particular interest is the possibility that methane hydrate might be present in these sediments.
    Keywords: 104-644; 104-644A; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
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  • 174
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    In:  Supplement to: Whiticar, Michael J; Faber, Eckhard (1989): Carbon, hydrogen, and oxygen isotope distribution in the interstitial fluids of ODP Leg 104, holes 642B, 642D, 643A, and 644A, Vøring Plateau, Norwegian Sea. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 285-290, https://doi.org/10.2973/odp.proc.sr.104.128.1989
    Publication Date: 2024-01-09
    Description: Carbon, hydrogen, and oxygen isotope ratios determined on 32 squeezed interstitial fluid samples show remarkable variations with depth. For the most part these variations are related to diagenetic and alteration reactions taking place in the sediments, and in the underlying basalts. delta13C SumCO2 depth distributions at Sites 642 and 643 are the result of mixing of original SumCO2 of the paleo bottom water with SumCO2 released by remineralization of organic matter. At Site 644, where sulfate exhaustion occurs, the processes of methanogenesis by CO2 reduction and anaerobic methanotrophy strongly influence the delta13C SumCO2 distribution. Hydrogen and oxygen isotopes roughly covary, and become enriched in 16O and1H with depth. This effect is most pronounced at Sites 642 and 643, possibly due to the influence of the directly underlying basalts. Isotope depletions at Site 644 are much lower, corresponding to the greater sediment depth to basement. The alternative, that the O, H isotope shifts are due primarily to autochthonous diagenetic and exchange reactions, is not supported by the data available.
    Keywords: 104-642; 104-643A; 104-644A; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
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  • 175
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    In:  Supplement to: Kvenvolden, Keith A; McDonald, Thomas J (1989): Organic geochemistry on Leg 104. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 291-307, https://doi.org/10.2973/odp.proc.sr.104.126.1989
    Publication Date: 2024-01-09
    Description: The Leg 104 organic geochemistry program consisted of monitoring (a) hydrocarbon gases, (b) organic and inorganic carbon, and (c) parameters resulting from Rock-Eval pyrolysis at three sites on the Voring Plateau. The results amplify some of those obtained earlier on Deep Sea Drilling Project (DSDP) Leg 38. In a regional sense there is an inverse correlation between amounts of hydrocarbon gas and organic carbon. For example, significant concentrations of methane are present only at Site 644 in the inner part of the plateau where organic carbon contents are always less than 1%; in contrast, at Site 642 on the outer plateau, methane concentrations are very low (ppm range) whereas amounts of organic carbon approach 2%. Only at Site 644 are the environmental conditions such that methanogenesis is an active diagenetic process. Because of the importance of routine gas analyses to the Ocean Drilling Program (ODP), a procedure was devised to improve the use of Vacutainers for collection of gas samples. Comparison of methods for determining organic carbon showed that at Sites 643 and 644 Rock-Eval TOC could be used as a measure of organic carbon, but not at Site 642. Although no liquid or solid hydrocarbons were encountered at any of the sites, a catalog of potential organic geochemical contaminants was developed in anticipation of such a discovery.
    Keywords: 104-642; 104-642B; 104-643A; 104-644A; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 7 datasets
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  • 176
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    In:  Supplement to: Sarnthein, Michael; Tiedemann, Ralf (1989): Toward a high-resolution stable isotope stratigraphy of the last 3.4 million years: Sites 658 and 659 off Northwest Africa. In: Ruddiman, W; Sarnthein, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 108, 167-185, https://doi.org/10.2973/odp.proc.sr.108.159.1989
    Publication Date: 2024-01-09
    Description: Ocean Drilling Program Site 658, cored below a major upwelling cell offshore Cap Blanc, contains a largely undisturbed hemipelagic sediment section spanning the Brunhes Chron and the early Quaternary and late Pliocene. The companion Site 659 recovered a complete and undisturbed Neogene profile further offshore that serves as a nonupwelling pelagic reference section. Oxygen and carbon isotope ratios in benthic (C. wuellerstorfi and in part Uvigerina sp.) and planktonic foraminifers (G. inflata) provide a climatic record of high resolution for the Brunhes Chron. At Site 658 the record extends back to the early Pleistocene and late Pliocene. The standard oxygen isotope record of the last 730,000 yr is markedly refined by a well-documented high-frequency variation (e.g., by a new "aborted" ice age at stage 13.2 and by Younger-Dryas style climatic setbacks during most terminations). In the late Pliocene, the numerical oxygen isotope stage taxonomy was extended back to stage 137 about 3.3 Ma ago. In comparison with published records, stage 114 at 2.7 Ma represents the first major glaciation event, when 18O was short-term enriched up to a middle Pleistocene glacial d18O level. About 3.17 Ma ago (stage 133), the interglacial oxygen isotope values of C. wuellerstorfi started to increase by 0.5 per mil until 2.7 Ma and then remained largely constant until the Holocene. Based on the d13C difference between C. wuellerstorfi and G. inflata, the dissolved CO2 in the ambient bottom water of Site 658 was dominated by the flux of particulate carbon from the overlying upwelling cell during the last 630,000 yr. In contrast, the advection of (upper) North Atlantic Bottom Water dominated in the control of the local CO2 content during the early Pleistocene and late Pliocene.
    Keywords: 108-658; 108-659; Canarias Sea; COMPCORE; Composite Core; Joides Resolution; Leg108; Ocean Drilling Program; ODP; South Atlantic Ocean
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  • 177
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    In:  Supplement to: Tiedemann, Ralf; Sarnthein, Michael; Stein, Ruediger (1989): Climatic changes in the western Sahara: aeolo-marine sediment record of the last 8 million years (Sites 657-661). In: Ruddiman, W; Sarnthein, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 108, 241-277, https://doi.org/10.2973/odp.proc.sr.108.169.1989
    Publication Date: 2024-01-09
    Description: Five Ocean Drilling Program sites (657-661), which form a north-south transect off the western periphery of the Sahara, were selected to measure the long-term history of Saharan/Sahelian dust flux and fluvial sediment discharge and the fluxes of marine CaCO3 and opal over the last 8 m.y. Sites 658 and 659 served for high-resolution studies, and Sites 657, 660, and 661 for insights into the spatial patterns of dust flux. The nearshore mean flux of opal off Cap Blanc (21 °N) showed an abrupt increase about 3 Ma that appears to reflect the main onset of coastal upwelling fertility and enhanced trade winds. At the same time, the input of river-borne clay strongly decreased, suggesting a dry up of the central Saharan rivers. Later, marked short-lived spikes of clay and opal may indicate ongoing ephemeral pulses of fluvial runoff linked to peak interglacial stages. Given the zonal dust discharge centered near 18 °N at Site 659, the aridification of the south Sahara and Sahel increased in several steps: at 4.6, 4.3, and especially at 4.0, 3.6, and 2.1 Ma, and again, at 0.8 Ma. The late Miocene and earliest Pliocene were humid. Although the central and north Saharan climate appears to be linked to the glaciation history of the Northern Hemisphere, the long-term aridification further south followed a different schedule. The spatial distribution of quartz accumulation suggests that the dust outbreaks linked to the Intertropical Convergence Zone during summer did not shift in latitude back to 4.0 Ma, at least. The short-term variations of dust output over the last 0.5 m.y. followed orbital scale pulses with a strong precessional signal, showing a link of Sahelian humidity changes to the variation of sea-surface temperature and evaporation in the tropical Atlantic.
    Keywords: 108-657; 108-658; 108-658A; 108-659; 108-660; 108-661; Canarias Sea; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg108; Ocean Drilling Program; ODP; South Atlantic Ocean
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  • 178
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    In:  Supplement to: Henrich, Rüdiger; Wolf, Thomas C W; Bohrmann, Gerhard; Thiede, Jörn (1989): Cenozoic paleoclimatic and paleoceanographic changes in the northern hemisphere revealed by variability of coarse-fraction composition in sediments from the Vøring Plateau-ODP Leg 104 drill sites. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 75-188, https://doi.org/10.2973/odp.proc.sr.104.196.1989
    Publication Date: 2024-01-09
    Description: Coarse-fraction studies of sediments recovered during ODP Leg 104 are used to reconstruct paleoclimatic and paleoceanographic environments on a time scale of 0.1 to 0.5 m.y. for the past 20 Ma. These investigations suggest that relatively warm climates and isolated deep water conditions prevailed prior to 13.6 Ma and between 5.6-4.8 Ma. The first major deep water outflow from the Norwegian-Greenland Sea into the North Atlantic took place at about 13.6 Ma. Progressive cooling linked to increased deep water renewal in the Norwegian-Greenland Sea appears to have occurred between 13.6-5.6 Ma and 4.8-3.1 Ma. A major onset of ice-rafted debris is recorded at 2.56 Ma. Terrigenous coarsefraction components show important fluctuations with two major peaks during the past 0.8 Ma.
    Keywords: 104-642B; 104-642D; 104-643A; 104-644A; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
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    Format: application/zip, 15 datasets
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  • 179
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    In:  Supplement to: Ciesielski, Paul F; Hasson, Phyllis; Turner, James W (1989): The stratigraphy of Neogene silicoflagellates from the Norwegian Sea, ODP Leg 104. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 497-525, https://doi.org/10.2973/odp.proc.sr.104.164.1989
    Publication Date: 2024-01-09
    Description: A quantative study was made of silicoflagellates recovered from Sites 642 (lower Miocene-upper Pliocene), 643 (lower Miocene-upper Miocene), and 644 (upper Pliocene-Quaternary) on the Voring Plateau. Although disconformities are present in these sequences, they represent a much more complete record of the Neogene than was recovered previously in the Norwegian Sea by DSDP Leg 38. Silicoflagellates are rare or absent for glacial sequences younger than 2.65 Ma, and generally sparse and poorly preserved in the lower upper Pliocene and upper Miocene. Lower and middle Miocene assemblages are diverse and generally well preserved. Temporal changes in the silicoflagellate assemblage are indicative of major paleoceanographic changes in the Norwegian Sea. A regional zonation for the Neogene of the Norwegian Sea is proposed, consisting of eleven zones: Naviculopsis lata Zone, N. quadrata Zone (emended), N. ponticula Zone (emended), Distephanus speculum hemisphaericus Zone (new), Caryocha ernestinae Zone (new), Bachmannocena circulus var. apiculata/Caryocha Zone (new), Distephanus crux scutulatus Zone (new), Bachmannocena diodon nodosa Zone (new), Distephanus boliviensis Zone (new), Ds. jimlingii Zone (elevated from subzonal to zonal status) with Subzones a and b (new), and Ds. speculum Zone (new). The ranges and abundances of over 100 species and morphotypes are tabulated.
    Keywords: 104-642C; 104-642D; 104-643A; 104-644A; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
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  • 180
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    In:  Supplement to: Ciesielski, Paul F; Case, Susan M (1989): Neogene paleoceanography of the Norwegian Sea based upon silicoflagellate assemblage changes in ODP Leg 104 sedimentary sequences. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 527-541, https://doi.org/10.2973/odp.proc.sr.104.166.1989
    Publication Date: 2024-01-09
    Description: Silicoflagellate assemblages of ODP Leg 104 Neogene sequences are the basis of an interpretation of changes in the Neogene paleoenvironment of the Norwegian Sea. Fluctuations in the percentages of temperature and nutrient-sensitive taxonomic groups document major changes in sea-surface conditions. A brief, but distinct, cooling event occurred at 18.0-17.5 Ma which resulted in the disappearance of Naviculopsis. Following this early Miocene cooling a long period of increasing surface-water temperature occurred, leading up to a thermal high in the early middle Miocene (14.0 Ma). The early late Miocene (10.0-9.0 Ma) was distinctly cooler than the middle Miocene, but warmer than the remainder of the Neogene. Conditions between 13.0 and 10.0 Ma are unrecorded because of a regional hiatus, which is the earliest evidence for an end to the more temperate and stable conditions of the early to middle middle Miocene. A major plunge in temperatures occurred between 8.5 and 7.4 Ma and during the remainder of the late Miocene and Pliocene; from 7.4 to 2.65 Ma subpolar conditions prevailed. Silicoflagellates disappeared, except for sporadic occurrences, at 2.64 Ma with the beginning of dominant glacial sedimentation. Biogenic opal is absent in sediments younger than 0.76 Ma, indicating the dominance of glacial conditions with extensive sea ice.
    Keywords: 104-642C; 104-642D; 104-643A; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
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  • 181
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    In:  Supplement to: Spiegler, Dorothee (1989): Ice-rafted Cretaceous and Tertiary fossils in Pleistocene-Pliocene sediments, ODP Leg 104, Norwegian Sea. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 739-744, https://doi.org/10.2973/odp.proc.sr.104.197.1989
    Publication Date: 2024-01-09
    Description: Ice-rafted fossils of late Cretaceous and Tertiary age were detected in Pleistocene-Pliocene glacially influenced sediments of the Vdring Plateau, eastern Norwegian Sea. The ice-rafted associations contain frequent Inoceramus (Bivalvia) prisms and rare occurrences of both benthic and planktonic foraminifers of Miocene, Oligocene, and Maastrichtian to Campanian age. As source areas, shallow outcrops on the Norwegian Continental Shelf as well as the Greenland Shelf and the North and Baltic Seas have to be considered.
    Keywords: 104-642B; 104-643A; 104-644A; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
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  • 182
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    In:  Supplement to: Locker, Sigurd; Martini, Erlend (1989): Cenozoic silicoflagellates, ebridians, and actiniscidians from the Vøring Plateau (ODP Leg 104). In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 543-585, https://doi.org/10.2973/odp.proc.sr.104.204.1989
    Publication Date: 2024-01-09
    Description: The lower Miocene to Pleistocene at Sites 642 and 644 is subdivided into eight silicoflagellate zones and nine ebridian-actiniscidian zones. Due to the bioevents selected, the silicoflagellate zonation may be recognized in high northern and southern latitudes. A sequence of 24 diagnostic silicoflagellate, ebridian and actiniscidian events tied to absolute ages is established, and both the biozonations and the event sequence are correlated with standard nannoplankton zones and paleomagnetic anomalies. Based on fluctuations of cool and warm water-preferring silicoflagellate taxa, more than ten cooling phases of seasurface waters are recognized for the early Miocene to late Pliocene at Site 642. A relative paleotemperature curve derived from same data indicates that sea-surface temperatures were relatively high from 21.7 to nearly 13.4 Ma. Temperatures decreased progressively during the late Miocene until a distinct warm peak around 5.45 Ma. During the Pliocene sea-surface temperatures were generally low and dropped drastically at about 3.2 Ma, just before the final disappearance of silicoflagellates at Site 642 around 3.1 Ma, probably corresponding to a brief glacial phase. At Site 644, silicoflagellates, ebridians, and actiniscidians persisted from 2.8 until 2.57 Ma, when abundances suddenly decreased with the onset of a substantial Northern Hemisphere glaciation. After an interval of disappearance from about 2.5 to 2.1 Ma, siliceous flagellates reappeared at Site 644 during several phases of warm-temperate water incursions from the North Atlantic. At about 1.9 Ma ebridians disappeared at Site 644, and at 0.74 Ma silicoflagellates and actiniscidians also disappeared. Abundance drops and disappearances of silicoflagellate and ebridian species from the early Miocene to late Pliocene proceeded during cooling phases. The most prominent events were the abundance drops in Corbisema and Foliactiniscus species and the disappearance of all Naviculopsis species in the early Miocene, and the successive disappearances of many silicoflagellate and ebridian species during the late Miocene and Pliocene. Seven new silicoflagellate taxa (Cannopilus hemisphaericus f. heptagonus, Dictyocha fibula subsp. tenuis, Distephanus paraspeculum f. paraspeculum and f. hexagonalis, D. quinarius, D. speculum subsp. constrictus, D. sulcatus f. maximus), six new ebridian species (Falsebria arborea, Haplohermesinum hovassei, Hermesinella primitiva, Pseudammodochium fenestratum, Spongebria curta, S. miocenica), and two new actiniscidian species {Actiniscus planatus, Foliactiniscus pulvinus) are described from Sites 642 and 644.
    Keywords: 104-642C; 104-642D; 104-644A; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
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  • 183
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    In:  Supplement to: Curry, William B; Miller, Kenneth G (1989): Oxygen and carbon istotopic variation in Pliocene benthic foraminifers of the equatorial Atlantic. in: Rudimann, W; Sarnthein, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 108, 157-166, https://doi.org/10.2973/odp.proc.sr.108.134.1989
    Publication Date: 2024-01-09
    Description: Large changes in benthic foraminiferal delta180 and delta13C occurred during the Pliocene (between 3.0 and 2.0 Ma) at Hole 665A. Oxygen isotopic compositions increased to maximum values at 2.4 Ma, correlating with an 18O enrichment observed at Hole 552A and other locations (Shackleton et al., 1984). As at Hole 606 (Keigwin, 1986), however, maximum delta180 values at 2.4 Ma were not as great as at Hole 552A, and enrichments in delta180 also occurred before 2.4 Ma. We believe that the section representing sediments from 2.5 to 2.7 or 2.8 Ma is missing at Hole 552A because of incomplete core recovery. Consequently, the older delta180 increases are not found at Hole 552A. Benthic foraminiferal delta13C values are much lower at Hole 665A than at Hole 552A, approaching the low values observed in the Pliocene Pacific Ocean. This geographic distribution of delta13C suggests that, like late Quaternary glaciations, the equatorial Atlantic Ocean was dominated during the Pliocene by deep water that originated in the Southern Ocean and had chemical characteristics very similar to the Pacific Ocean. Reduced O2 values were probably associated with low delta13C values and contributed to increased preservation of organic carbon during enriched 180 intervals of the Pliocene equatorial Atlantic.
    Keywords: 108-665A; 81-552A; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Joides Resolution; Leg108; Leg81; North Atlantic/PLATEAU; Ocean Drilling Program; ODP; South Atlantic Ocean
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  • 184
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    In:  Supplement to: Fisk, Martin R; Duncan, Robert A; Baxter, Alistair N; Greenough, John D; Hargraves, Robert B; Tatsumi, Yoshiyuki; Shipboard Scientific Party (1989): Reunion hotspot magma chemistry over the past 65 m.y.: Results from Leg 115 of the Ocean Drilling Program. Geology, 17(10), 934-937, https://doi.org/10.1130/0091-7613(1989)017%3C0934:RHMCOT%3E2.3.CO;2
    Publication Date: 2024-01-09
    Description: Leg 115 of the Ocean Drilling Program recovered basalts from four locations along the hotspot track that leads from the Deccan flood basalts in India to Reunion Island in the western Indian Ocean (Sites 706, 707, 713, and 715). The drilled basalts range in age from 35 Ma (Site 706) to 64 Ma (Site 707), and including the Deccan basalts (66 to 68 Ma), Mauritius Island (0.2 to 8 Ma), and Reunion Island (0 to 2 Ma), seven sites are provided for sampling the volcanic record of the 5000-km-long hotspot track. Chemical and age comparisons indicate that Site 707 lavas correlate with basalt units near the top of the Deccan flood basalt sequence. The lavas of Site 715 (55 to 60 Ma) are most similar to the islands of Mauritius and Reunion. Site 713 basalts (48 Ma) are similar to the earliest lavas of the Deccan province, and Site 706 basalts are intermediate in chemistry between those of central Indian spreading-ridge basalts and Reunion. Differences in lava compositions along the hotspot track can be related to variable mixing of plume and asthenospheric mantle, depending on the changing position of spreading-ridge segments and the hotspot during the opening of the Indian Ocean. Alternatively, time-dependent changes in the composition of hotspot melts may be due to a decrease in partial melting of a heterogeneous plume or to intrinsic changes in the composition of material supplied by the plume.
    Keywords: 115-706; 115-707; 115-713; 115-715; COMPCORE; Composite Core; Indian Ocean; Joides Resolution; Lakshadweep Sea; Leg115; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
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  • 185
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    In:  Supplement to: Goll, Robert M; Bjorklund, Kjell R (1989): A new radiolarian biostratigraphy for the Neogene of the Norwegian Sea: ODP Leg 104. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 697-737, https://doi.org/10.2973/odp.proc.sr.104.205.1989
    Publication Date: 2024-01-09
    Description: Radiolaria are present in frequencies ranging from rare to abundant and with generally moderate to good preservation quality in Leg 104 sediments younger than 22 Ma. Preservation degrades in progressively younger sediments, and upper Pliocene to mid-Pleistocene radiolaria were found only at Site 644, where sporadic assemblages of moderate to poorly preserved specimens persist to approximately 0.75 Ma. Radiolaria are essentially absent in Leg 104 recovery older than basal Miocene. The stratigraphic ranges of 55 taxa of radiolaria are documented in 451 samples from the biosiliceous recoveries of Holes 642B, 642C, 642D, 643A, and 644A. The stratigraphic ranges of 25 of these species are used as boundary criteria for a new system of 28 Neogene zones and subzones that are used to characterize approximately 72% of the past 22 m.y. of sedimentation on the Vriring Plateau. This new scheme is intended to supercede the NRS zones provisionally proposed in the Leg 104 Initial Reports. The applicability of this regional biozonation beyond the Wring and Iceland Plateaus is not presently known. The radiolaria biostratigraphy serves as a basis for inferring a sequence of hiatuses and faunal overturns that may be associated with sea-level low stands and consequent cold-water isolation of the Norwegian Sea. Twenty-one new taxa are described as follows: Actinomma henningsmoeni, Actinomma livae, Actinomma mirabile, Actinomma plasticum, Ceratocyrtis broeggeri, Ceratocyrtis manumi, Ceratocyrtis stoermeri, Clathrospyris vogti, Corythospyris hispida, Corythospyris jubata sverdrupi, Corythospyris reuschi, Crytocapsella ampullacea, Cyrocapsella kladaros, Gondwanaria japonica kiaeri, Hexalonche esmarki, Larcospira bulbosa, Phormospyris thespios, Pseudodicytophimus amundseni, Spongotrochus vitabilis, Spongurus cauleti, and Tessarastrum thiedei.
    Keywords: 104-642B; 104-642C; 104-642D; 104-643A; 104-644A; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
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  • 186
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    In:  Supplement to: Bohrmann, Gerhard; Stein, Ruediger (1989): Biogenic silica at ODP Site 647 in the southern Labrador Sea: occurrence, diagenesis, and paleoceanographic implications. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 155-170, https://doi.org/10.2973/odp.proc.sr.105.121.1989
    Publication Date: 2024-01-09
    Description: Eocene to Holocene sediments from Ocean Drilling Program (ODP) Site 647 (Leg 105) in the southern Labrador Sea, approximately 200 km south of the Gloria Drift deposits, were investigated for their biogenic silica composition. Three sections of different diagenetic alteration products of primary siliceous components could be distinguished: (1) opal-A was recorded in the Miocene and the early Oligocene time intervals with strongly corroded siliceous skeletons in the Miocene and mostly well preserved biogenic opal in the early Oligocene; (2) opal-CT precipitation occurs between 250-440 meters below seafloor (mbsf) (earliest Oligocene to late Eocene); (3) between 620-650 mbsf (early/middle Eocene), biogenic opal was transformed to clay minerals by authigenesis of smectites. Using accumulation rates of biogenic opal, paleoproductivity was estimated for the early Oligocene to late Eocene interval. A maximum productivity of biogenic silica probably occurred between 35.5 and 34.5 Ma (early Oligocene). No evidence for opal sedimentation during most of middle Eocene was found. However, at the early/middle Eocene boundary (around 52 Ma), increased opal fluxes were documented by diagenetic alteration products of siliceous skeletons.
    Keywords: 105-647A; DRILL; Drilling/drill rig; Joides Resolution; Leg105; Ocean Drilling Program; ODP; South Atlantic Ocean
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  • 187
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    In:  Supplement to: Thiébault, Francois; Cremer, Michel; Debrabant, Pierre; Foulon, J; Nielsen, Ole Bjorslev; Zimmerman, Herman (1989): Analysis of sedimentary facies, clay mineralogy, and geochemistry of the Neogene-Quaternary sediments in ODP Site 645, Baffin Bay. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 83-100, https://doi.org/10.2973/odp.proc.sr.105.111.1989
    Publication Date: 2024-01-09
    Description: Subcontinuously cored early(?)-middle Miocene to recently deposited sediments from ODP Site 645 were studied texturally, mineralogically, and geochemically. The entire sequence contains minerals and associated chemical elements that are chiefly of detrital origin. In particular, the clay minerals, which include smectite, kaolinite, chlorite, and illite, are detrital. No obvious evidence of diagenesis with depth, of burial, of volcanism, or of hydrothermal alteration was observed. The sedimentary textures, clay mineralogy, and 〈2-µm fraction geochemistry of the early middle Miocene sediments (630 to 1147 mbsf) suggest the pronounced but variable influence of a southward bottom current. Two clay facies are defined. The lower one, Cj (780 to 1147 mbsf), is characterized by the great abundance of discrete smectite (with less than 15% illite interlayers), probably detrital in origin, and reworked older, discrete, smectite-rich sediments. The upper clay facies, C2 (630 to 780 mbsf), shows a net decrease of the fully expandable clay abundances, with a great abundance of mixed-layer, illite-smectite clays (60 to 80% of illite interlayers). Such clay assemblages can be inherited from paleosoils or older sedimentary rocks. An important change occurs at 630 mbsf (clay fraction) or 600 mbsf (sedimentary texture), which may be explained by the beginning of continental glaciation (630 mbsf, ~9 Ma) and the onset of ice rafting in Baffin Bay (600 mbsf, ~8 Ma). Above this level, the characteristics and modifications of the clay assemblages are controlled climatically and can be explained by the fluctuations of (1) ice-rafting, (2) speed of weak bottom currents, and (3) some supply by mud turbiditic currents. Three clay facies (C3, C4, and C5) can be defined by the abrupt increases of the inherited chlorite and illite clays.
    Keywords: 105-645D; 105-645E; 19-184B; 19-189; 19-192A; Baffin Bay; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Joides Resolution; Leg105; Leg19; North Pacific/Bering Strait/PLATEAU; North Pacific/Bering Strait/RIDGE; North Pacific/GUYOT; Ocean Drilling Program; ODP
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  • 188
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    In:  Supplement to: Alexandrovich, Joanne M (1989): Radiolarian biostratigraphy of ODP Leg 111, Site 677, eastern equatorial Pacific, Late Miocene through Pleistocene. In: Becker, K; Sakai, H; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 111, 245-262, https://doi.org/10.2973/odp.proc.sr.111.145.1989
    Publication Date: 2024-01-09
    Description: Well-preserved late Miocene through Pleistocene age radiolarian assemblages were recovered during ODP Leg 111 at Site 677, on the southern flank of the Costa Rica Rift in the eastern equatorial Pacific. Radiolarian "event" biostratigraphy (first and last morphotypic appearances) was established for Holes 677A and 677B using 21 species yielding 24 reliable datum levels. The cold upwelling waters above this site have prevented many typical tropical Pacific stratigraphic radiolarians from being useful age indicators. Biostratigraphic datum levels were assigned absolute ages based on previous work and were used to date the cores. Sedimentation rates varied from 3.7 cm/1000 yr in the late Pleistocene to 6.0 cm/1000 yr in the late Miocene. The age of the oldest sediments at this site is estimated as 5.89-6.37 Ma, which indicates that Site 677 is between magnetic anomalies 3A and 4. A total of 67 taxa were assessed for stratigraphic relevance at this site and are listed in the Appendix. One previously unknown Pliocene radiolarian stratigraphic indicator, Botryostrobus euporus (Ehrenberg), is identified.
    Keywords: 111-677A; 111-677B; DRILL; Drilling/drill rig; Joides Resolution; Leg111; North Pacific Ocean; Ocean Drilling Program; ODP
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  • 189
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    In:  Supplement to: Weinholz, Peter; Lutze, Gerhard F (1989): The stilostomella extinction. In: Ruddiman, W; Sarnthein, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 108, 113-117, https://doi.org/10.2973/odp.proc.sr.108.176.1989
    Publication Date: 2024-01-09
    Description: A faunal boundary found at the base of the Brunhes Chronozone at Sites 658 and 659 confirms previous observations from several locations in the Atlantic Ocean and may be classified as a supraregional "extinction event". Several benthic foraminifer species typical of the Pliocene disappear near the Brunhes/Matuyama boundary, thus marking the upper limit of a faunal zone (faunal unit). Improved chronological dating indicates that the disappearance of these species occurs over a period of about 100,000 yr.
    Keywords: 108-658A; 108-659A; Canarias Sea; DRILL; Drilling/drill rig; Joides Resolution; Leg108; Ocean Drilling Program; ODP; South Atlantic Ocean
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  • 190
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    In:  Supplement to: Chepstow-Lusty, Alex J; Backman, Jan; Shackleton, Nicholas J (1989): Comparison of Upper Pliocene discoaster abundance variations from North Atlantic Sites 552, 607, 658, 659, and 662: further evidence for marine plankton responding to orbital forcing. In: Ruddiman, W; Sarnthein, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 108, 121-141, https://doi.org/10.2973/odp.proc.sr.108.122.1989
    Publication Date: 2024-01-09
    Description: Abundance variations of six Pliocene species of discoasters have been analyzed over the time interval from 1.89 to 2.95 Ma at five contrasting sites in the North Atlantic: Deep Sea Drilling Project Sites 552 (56°N) and 607 (41°N) and Ocean Drilling Program 658 (20°N), 659 (18°N), and 662 (1°S). A sampling interval equivalent to approximately 3 k.y. was used. Total Discoaster abundance showed a reduction with increasing latitude and from the effects of upwelling. This phenomenon is most obvious in Discoaster brouweri, the only species that survived over the entire time interval studied. Prior to 2.38 Ma, Discoaster pentaradiatus and Discoaster surculus are important components of the Discoaster assemblage: Discoaster pentaradiatus increases slightly with latitude up to 41°N, and its abundance relative to D. brouweri increases up to 56°N; D. surculus increases in abundance with latitude and with upwelling conditions relative to both D. brouweri and D. pentaradiatus and is dominant to the latter species at upwelling Site 658 and at the highest latitude sites. Discoaster asymmetricus and Discoaster tamalis appear to increase in abundance with latitude relative to D. brouweri. Many of the abundance changes observed appear to be connected with the initiation of glaciation in the North Atlantic at 2.4 Ma. The long-term trend of decreasing Discoaster abundance probably reflects the fall of sea-surface temperatures. This trend of cooling is overprinted by short-term variations that are probably associated with orbital forcing. Evidence for the astronomical elements of eccentricity and obliquity periodicities were found at all sites; however, only at Sites 607, 659, and 662 were precessional periodicities detected. Furthermore, only at Site 659 was precession found to be dominant to obliquity. Abundance peaks of individual species were found to cross-correlate between sites. The distinct abundance fluctuations observed especially in the tropics suggest that temperature is not the only factor responsible for this variation. This study reveals for the first time the importance of productivity pressure on the suppression of Discoaster abundance.
    Keywords: 108-658A; 108-659A; 108-662A; 81-552A; 94-607A; Canarias Sea; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Joides Resolution; Leg108; Leg81; Leg94; North Atlantic/FLANK; North Atlantic/PLATEAU; Ocean Drilling Program; ODP; South Atlantic Ocean
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 191
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    In:  Supplement to: Ruddiman, William F; Janecek, Thomas R (1989): Pliocene-Pleistocene biogenic and terrigenous fluxes at equatorial Atlantic Sites 662, 663, and 664. In: Ruddiman, W; Sarnthein, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 108, 211-240, https://doi.org/10.2973/odp.proc.sr.108.165.1989
    Publication Date: 2024-01-09
    Description: High-resolution analyses of sediments at equatorial Atlantic Sites 662, 663, and 664 define the accumulation rates of biogenically produced CaC03 and opal and of eolian dust from North Africa over the last 3.7 m.y. The mean flux of opal increased abruptly by 60%-70% near 2.5 Ma (2.65 to 2.3 Ma), reflecting pulses of increased opal productivity along the equator due mainly to increased upwelling. The mean winter-plume dust influx from Sahelian and Saharan Africa also increased at this time by between 35% and 75%, following smaller increases earlier in the late Pliocene. The increased opal flux implies a stronger zonal component of the southern trade winds in Southern Hemisphere winter. Consistent with this wind configuration, the stronger dust flux suggests a weaker southwesterly monsoonal flow into Africa in Northern Hemisphere summer, thus increasing Sahelian aridity and winter-plume dust fluxes. Dust fluxes to the equator may possibly have also been enhanced by stronger Northern Hemisphere winter trade winds and a more southerly position of the Intertropical Convergence Zone over Africa. These late Pliocene biogenic and terrigenous flux changes coincided with the appearance of Northern Hemisphere ice sheets, implying an ultimate causal link. The immediate control on changes in tropical circulation may, however, have been changes in the Atlantic sector of the Southern Ocean. A steady background trend of increasing winter-plume dust flux occurred from the late Pliocene until the middle Pleistocene. This may reflect a progressive, tectonically induced aridification of northern and eastern Africa because of the gradual uplift of the Tibetan Plateau.
    Keywords: 108-662A; 108-663A; 108-664B; 108-664D; DRILL; Drilling/drill rig; Joides Resolution; Leg108; Ocean Drilling Program; ODP; South Atlantic Ocean
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 192
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    In:  Supplement to: Kvenvolden, Keith A; Golan-Bac, Margaret; McDonald, Thomas J; Pflaum, Ronald C; Brooks, James M (1989): Hydrocarbon gases in sediment of the Vøring Plateau, Norwegian Sea. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 319-326, https://doi.org/10.2973/odp.proc.sr.104.125.1989
    Publication Date: 2024-01-09
    Description: Geochemical studies at three ODP Leg 104 sites on the Wring Plateau help define the distribution of hydrocarbon gases in sediment of this prominent feature of the Norwegian continental margin. Low levels of hydrocarbon gas were encountered in sediment of the outer part of the plateau, but sediment of the inner part of the plateau is very gassy. The molecular composition of inner plateau gases (〉99.9% methane) and the carbon isotopic composition of the methane (avg. = -76 per mil relative to the PDB standard) clearly show that the gas is biogenic. Heavier hydrocarbon gases accompany this methane, and their presence is probably a result of both chemical and microbial low-temperature diagenesis. Although these heavier hydrocarbons were not detected in sediment of the outer part of the plateau during shipboard analyses, subsequent shore-based analyses showed that these compounds are present at very low concentrations. Methane in the gassy sediment of the inner part of the plateau may be present as gas hydrates, judging from sedimentological and inorganic geochemical considerations, but no discernible gas hydrates were recovered during drilling.
    Keywords: 104-642; 104-643A; 104-644; 104-644A; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 193
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    In:  Supplement to: Whiticar, Michael J; Faber, Eckhard (1989): Molecular and stable isotope composition of headspace and total hydrocarbon gases at ODP Leg 104, Sites 642, 643, and 644, Vøring Plateau, Norwegian Sea. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 327-334, https://doi.org/10.2973/odp.proc.sr.104.127.1989
    Publication Date: 2024-01-09
    Description: Molecular and isotope compositions of headspace and total (free + sorbed) hydrocarbon gases from drilled cores of the three ODP Leg 104 Sites 642, 643, and 644 of the Voring Plateau are used to characterize the origin and distribution of these gases in Holocene to Eocene sediments. Only minor amounts of methane were found in the headspace (0.1 to 〈 0.001 vol%). Although methane through propane are present in all of the total gas samples, different origins account for the concentration and composition variations found. Site 643 at the foot of the outer Voring Plateau represents a geological setting with poor hydrocarbon generating potential, (sediments with low TOC and maturity overlying oceanic basement). Correspondingly, the total gas concentrations are low, typical for background gases (yield C1 - 4 = 31 to 232 ppb, C1/C2+ = 0.6 to 4; delta13C(CH4) -22 per mil to -42 per mil) probably of a diagenetic origin. Holocene to Eocene sediments, which overlie volcanic units, were drilled on the outer Vdring Plateau, at Holes 642B and D. Similar to Site 643, these sediments possess a poor hydrocarbon generating potential. The total gas character (yield C1 - 4 = 20 to 410 ppb; C1/C2+ = 1.7 to 13.3; delta13C(CH4) ca. -23 per mil to -40 per mil) again indicates a diagenetic origin, perhaps with the addition of some biogenic gas. The higher geothermal gradient and the underlying volcanics do not appear to have any influence on the gas geochemistry. The free gas (Vacutainer TM) in the sediments at Site 644 are dominated by biogenic gas (C1/C2+ 〉 104; delta13C(CH4) -77 per mil). Indications, in the total gas, of hydrocarbons with a thermogenic signature (yield C1 - 4 = 121 to 769 ppb, C1/ C2+ = 3 to 8; delta13C(CH4) = -39 per mil to -71 per mil), could not be unequivocally confirmed as such. Alternatively, these gases may represent mixtures of diagenetic and biogenic gases.
    Keywords: 104-642B; 104-642D; 104-643A; 104-644A; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 9 datasets
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  • 194
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    In:  Supplement to: Bitschene, Peter Rene; Schmincke, Hans-Ulrich; Viereck-Götte, Lothar (1989): Cenozoic ash layers on the Vøring Plateau (ODP Leg 104). In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 357-366, https://doi.org/10.2973/odp.proc.sr.104.129.1989
    Publication Date: 2024-01-09
    Description: Numerous fresh ash layers comprise about 0.3% by volume of Neogene to Holocene sediments drilled at Leg 104 Sites 642 and 643 (Vøring Plateau, North Atlantic). Median grain sizes of the ashes are about 100 /µm and maximum grain sizes range up to 1200 µm. Rhyolitic pumice shards dominate, with minor bubble wall shards. Basaltic shards are poorly vesicular and blocky or round. Phenocrystic plagioclase, zircon, and clinopyroxene occur in the rhyolitic, plagioclase, and clinopyroxene phenocrysts and basaltic lithics in the basaltic tephra. Quartz, amphibole, clinozoisite, and rutile are interpreted as xenocrysts. All ash layers are well-sorted and represent distal fallout from major explosive eruptions. Most ashes are rhyolitic (high-K and low-K) in composition, some are bimodal (tholeiitic and rhyolitic). Early Miocene tephra is dominantly basaltic. Iceland is inferred to be the likely source region for most ashes. Late Miocene high-K rhyolites may have originated from the K-rich Jan Mayen magmatic province. One Quaternary layer with biotite and alkali feldspar phenocrysts may have been derived from Jan Mayen Island. Four individual Pliocene to Holocene ash layers from Sites 642 and 643 can be correlated fairly well. Upper Miocene layers are tentatively correlated as a sequence between Sites 642 and 643. Average calculated layer frequencies are about three layers/m.y. through the Pliocene and Pleistocene and five to eight layers per m.y. through the middle and late Miocene, suggesting rather continuous volcanic activity in the North Atlantic. Episodic magmatic activity during Neogene epochs in this part of the North Atlantic, as postulated in the literature, cannot be confirmed.
    Keywords: 104-642B; 104-642C; 104-643A; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 195
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    In:  Supplement to: Desprairies, Alain; Maury, R C; Joron, Jean Louis; Bohn, Marcel; Tremblay, P (1989): Distribution, chemical characteristics, and origin of ash layers from ODP Leg 104, Vøring Plateau, North Atlantic. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 337-356, https://doi.org/10.2973/odp.proc.sr.104.120.1989
    Publication Date: 2024-01-09
    Description: Forty-five volcanic ash horizons cored at Sites 642, 643, and 644 on the Vøring Plateau and ranging in age from early Miocene to Pleistocene, are discussed in terms of their magmatic features as well as their diagenetic evolution. Most of these layers, some centimeters thick, are mainly made of fresh rhyolitic glass. Twenty-five percent of the ash layers, however, contain variable amounts of more basic glass shards, ranging in composition from Mg-rich tholeiites to icelandites through Mg-poor basalts, ferrobasalts, and tholeiitic andesites, and are commonly associated with rhyolitic shards. Many chemically heterogeneous ash layers show bimodal acidic (rhyolites to icelandites) - basic (Mg-rich basalts to ferrobasalts) frequency distributions of the glass shards; intermediate compositions are not simple mixtures between acidic and basic endmembers. We suggest these ash layers result from the ejection of the upper (rhyolitic) to intermediate (ferrobasaltic) levels of density-stratified magma chambers intruded by ascending basaltic magmas, as exemplified by several Quaternary Icelandic explosive eruptions. The overall characteristics of the chemical trends of glass shards from heterogeneous ash layers are typically tholeiitic, with a strong increase of total iron and TiO2 at the level of intermediate compositions. Major and trace element data on bulk ash layers indicate that all the tephra of bimodal composition, as well as most of Neogene rhyolitic ash levels (low-K type), belong to LREE-enriched tholeiitic series. However, some Miocene rhyolitic ash levels (high-K type) show distinct geochemical features and are probably derived from other sources. The volcanic glass alteration patterns have no relationship with the ages of the deposits, and are different for acid and basic glasses. The most common alteration process leads to the formation of iron-beidellite-type smectites through loss of Si and alkalis from silicic glasses and loss of Si, Mg, Fe from basic glasses. Another kind of alteration, observed in lower Miocene ash layers, leads to glauconite formation through the development of iron-rich smectites. The frequency of ash layer occurrence with time indicates two apparent maxima of volcanic activity, an early one at the early-middle Miocene boundary (16 to 14 Ma) and another one in the late Miocene (8 to 7 Ma). Iceland is the most likely source for all the chemically heterogeneous ash layers as well as the low-K rhyolitic ash levels belonging to these two major episodes. Other subaerial sources, possibly at rifted margins (East Greenland, Jan Mayen Ridge), are required for the high-K rhyolitic ash horizons.
    Keywords: 104-642; 104-642B; 104-642C; 104-642D; 104-643A; 104-644A; 104-644B; 81-552A; 81-553A; COMPCORE; Composite Core; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Joides Resolution; Leg104; Leg81; North Atlantic/PLATEAU; Norwegian Sea; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 8 datasets
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  • 196
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    In:  Supplement to: Kusakabe, Minoru; Shibata, Tsugio; Yamamoto, Masahiro; Mayeda, Shingo; Kagami, Hiroo; Honma, Hiroji; Masuda, Harue; Sakai, Hitoshi (1989): Petrology and isotope characteristics (H, O, S, Sr, and Nd) of basalts from Ocean Drilling Program Hole 504B, Leg 111, Costa Rica Rift. In: Becker, K; Sakai, H; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 111, 47-60, https://doi.org/10.2973/odp.proc.sr.111.137.1989
    Publication Date: 2024-01-09
    Description: Petrography and isotope geochemical characteristics of H, O, S, Sr, and Nd have been described for basalts recovered from Hole 504B during Leg 111 of the Ocean Drilling Program. The petrographic and chemical features of the recovered basalts are similar to those obtained previously (DSDP Legs 69, 70, and 83); they can be divided into phyric (plagioclase-rich) and aphyric (Plagioclase- and clinopyroxene-rich) basalts and show low abundances of TiO2, Na2O, K2O, and Sr. This indicates that the basalts belong to Group D, comprising the majority of the upper section of the Hole 504B. The diopside-rich nature of the clinopyroxene phenocrysts and Ca-rich nature of the Plagioclase phenocrysts are also consistent with the preceding statement. The Sr and Nd isotope systematics (average 87Sr/86Sr = 0.70267 ± 0.00007 and average 143Nd/144Nd = 0.513157 ± 0.000041) indicate that the magma sources are isotopically heterogeneous, although the analyzed samples represent only the lowermost 200-m section of Hole 504B. The rocks were subjected to moderate hydrothermal alteration throughout the section recovered during Leg 111. Alteration is limited to interstices, microfractures, and grain boundaries of the primary minerals, forming chlorite, actinolite, talc, smectite, quartz, sphene, and pyrite. In harmony with the moderate alteration, the following alteration-sensitive parameters show rather limited ranges of variation: H2O = 1.1 ±0.2 wt%, dD = - 38 per mil ± 4 per mil, d180 = 5.4 per mil ± 0.3 per mil, total S = 562 ± 181 ppm, and d34S = 0.8 per mil ± 0.3 per mil. Based on these data, it was estimated that the hydrothermal fluids had dD and d180 values only slightly higher than those of seawater, the water/rock ratios were as low as 0.02-0.2, and the temperature of alteration was 300°-400°C. Sulfur exists predominantly as pyrite and in minor quantities as chalcopyrite. No primary monosulfide was detected. This and the d34S values of pyrite (d34S = 0.8 per mil) suggest that primary pyrrhotite was almost completely oxidized to pyrite by reaction with hydrothermal fluids containing very little sulfate.
    Keywords: 111-504B; DRILL; Drilling/drill rig; Joides Resolution; Leg111; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 197
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    In:  Supplement to: Sato, Hiroaki (1989): Mg-Fe partitioning between plagioclase and liquid in basalts of Hole 504B, ODP Leg 111: a study of melting at 1 ATM. In: Becker, K; Sakai, H; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 111, 17-26, https://doi.org/10.2973/odp.proc.sr.111.113.1989
    Publication Date: 2024-01-09
    Description: The effect of oxygen fugacity (fO2) on the partition relationship of Mg and Fe between Plagioclase and sillicate liquid was investigated at 1 atm for basaltic samples recovered during ODP Leg 111 from Hole 504B. Samples 111-504B-143R-2 (Piece 8) and 111-504B-169R-1 (Piece 1) have Plagioclase as the liquidus phase. The distribution coefficient of Mg between Plagioclase and melt is constant at about 0.04 against the variation of fO2, whereas that of Fe (total Fe) varies from 0.3 at f(O2) = 0.2 atm to 0.03 at f(o2) = 10**-11.5 at 1200°C. The distribution coefficient of Mg is slightly higher than that calculated from the phenocryst and bulk-rock compositions, suggesting a kinetic disequilibrium effect on the distribution of Mg in Plagioclase. Because Mg, Fe, and Fe3+ have similar diffusion coefficients in silicate melt, the disequilibrium effect is greatly reduced for the exchange reaction of Mg and total Fe between Plagioclase and liquid. The exchange partition coefficient is highly dependent on fo2, with log fo2 ranging from -0.7 to - 11.5 at approximately 1200°C. Using this relationship, the f(O2) of crystallization of the magmas is estimated to be near the one defined by the fayalite-quartz-magnetite assemblage.
    Keywords: 111-504B; DRILL; Drilling/drill rig; Joides Resolution; Leg111; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 198
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    In:  Supplement to: Ishizuka, Hideo (1989): Mineral paragenesis of altered basalts from Hole 504B, ODP Leg 111. In: Becker, K; Sakai, H; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 111, 61-76, https://doi.org/10.2973/odp.proc.sr.111.121.1989
    Publication Date: 2024-01-09
    Description: Basalts recovered from Hole 504B during ODP Leg 111 are more or less altered, but there is no sign of strong shear stress or widespread penetrative deformation; hence, they retain well their primary (igneous) structures and textures. The effect of alteration is recognized as the partial or total replacement of primary minerals (olivine, clinopyroxene, and plagioclase) by secondary minerals and as the development of secondary minerals in open spaces (e.g., veins, fractures, vugs, or breccia matrix). The secondary minerals include zeolite (laumontite and stilbite), prehnite, chlorite, epidote, Plagioclase (albite and/or oligoclase), amphibole (anthophyllite, cummingtonite, actinolite, and hornblende), sodic augite, sphene, talc, anhydrite, chalcopyrite, pyrite, Fe-Ti oxide, and quartz. Selected secondary minerals from several tens of samples were analyzed by means of an electron-probe microanalyzer; the results are presented along with brief considerations of their compositional features. In terms of the model basaltic system, the following two types of low-variance (three-phase) mineral assemblages were observed: prehnite-epidote-laumontite and prehnite-actinolite-epidote; both include chlorite, albite and/or oligoclase, sphene, and quartz. The mineral parageneses delineated by these low-variance mineral assemblages suggest that the metamorphic grade ranges from the zeolite facies to the prehnite-actinolite facies. The common occurrence of prehnite indicates that greenschist facies conditions were not attained even in the deepest level of Hole 504B, which, in a strict sense, contradicts the previous interpretation that the lower portion of Hole 504B suffered greenschist facies alteration.
    Keywords: 111-504B; DRILL; Drilling/drill rig; Joides Resolution; Leg111; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 9 datasets
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  • 199
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    In:  Supplement to: Love, David A; Frape, Shaun K; Gibson, Ian L; Jones, M G (1989): The d18O and d13C isotopic composition of secondary carbonates from basaltic lavas cored in Hole 642E, Ocean Drilling Program Leg 104. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 449-455, https://doi.org/10.2973/odp.proc.sr.104.140.1989
    Publication Date: 2024-01-09
    Description: Hole 642E is located near the outer margin of the Voring Plateau in the Norwegian Sea. The thick pile of basaltic lavas penetrated during drilling are variably altered with extensive development of calcite, which fills vesicles and fractures along with saponite and celadonite. delta13C results, determined by mass spectrometry, show that most carbonates above about 1040 m have values between -2.5 and -5.5 per mil (PDB), but a few samples at approximately 1090 m have depleted delta13C values down to -26.3 per mil. Below 1100 m the delta13C values decrease from -6.0 per mil to -12 per mil. The delta 18O values range between -1.9 and -13.7 per mil (PDB), and generally decrease with depth. The results are interpreted as indicating that the calcites were precipitated from cool seawater percolating through the basalt pile at waterrrock of less than 10:1, during seawater incursion at about 54 Ma. The progressive depletion with depth may result from subsequent reequilibration at temperatures below those of formation, and the geothermal gradient on the Wring Plateau appears to have decreased with time. The very depleted values of delta13C for carbonates around the 1090-m level are probably related to organic matter from an underlying volcaniclastic unit.
    Keywords: 104-642E; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 200
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    In:  Supplement to: LeHuray, A P; Johnson, E S (1989): Rb-Sr systematics of Site 642 volcanic rocks and alteration minerals. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 437-448, https://doi.org/10.2973/odp.proc.sr.104.138.1989
    Publication Date: 2024-01-09
    Description: Subaerially erupted tholeiites at Hole 642E were never exposed to the high-temperature seawater circulation and alteration conditions that are found at subaqueous ridges. Alteration of Site 642 rocks is therefore the product of the interaction of rocks and fluids at low temperatures. The alteration mineralogy can thus be used to provide information on the geochemical effects of low temperature circulation of seawater. Rubidium-strontium systematics of leached and unleached tholeiites and underlying, continentally-derived dacites reflect interactions with seawater in fractures and vesicular flow tops. The secondary mineral assemblage in the tholeiites consists mainly of smectite, accompanied in a few flows by the assemblage celadonite + calcite (+/- native Cu). Textural relationships suggest that smectites formed early and that celadonite + calcite, which are at least in part cogenetic, formed later than and partially at the expense of smectite. Smectite precipitation occurred under variable, but generally low, water/rock conditions. The smectites contain much lower concentrations of alkali elements than has been reported in seafloor basalts, and sequentially leached fractions of smectite contain Sr that has not achieved isotopic equilibrium. 87Sr/86Sr results of the leaching experiments suggest that Sr was mostly derived from seawater during early periods of smectite precipitation. The basalt-like 87Sr/86Sr of the most readily exchangeable fraction seems to suggest a late period of exposure to very low water /rock. Smectite formation may have primarily occurred in the interval between the nearly 58-Ma age given by the lower series dacites and the 54.5 +/- 0.2 Ma model age given by a celadonite from the top of the tholeiitic section. The 54.5 +/- 0.2 Ma Rb-Sr model age may be recording the timing of foundering of the Voring Plateau. Celadonites precipitated in flows below the top of the tholeiitic section define a Rb-Sr isochron with a slope corresponding to an age of 24.3 +/- 0.4 Ma. This isochron may be reflecting mixing effects due to long-term chemical interaction between seawater and basalts, in which case the age provides only a minimum for the timing of late alteration. Alternatively, inferrential arguments can be made that the 24.3 +/- 0.4 isochron age reflects the timing of the late Oligocene-early Miocene erosional event that affected the Norwegian-Greenland Sea. Correlation of 87Sr/86Sr and 1/Sr in calcites results in a two-component mixing model for late alteration products. One end-member of the mixing trend is Eocene or younger seawater. Strontium from the nonradiogenic endmember can not, however, have been derived directly from the basalts. Rather, the data suggest that Sr in the calcites is a mixture of Sr derived from seawater and from pre-existing smectites. For Site 642, the reaction involved can be generalized as smectite + seawater ++ celadonite + calcite. The geochemical effects of this reaction include net gains of K and CO2 by the secondary mineral assemblage. The gross similarity of the reactions involved in late, low-temperature alteration at Site 642 to those observed in other sea floor basalts suggests that the transfer of K and C02 to the crust during low-temperature seawater-ocean crust interactions may be significant in calculations of global fluxes.
    Keywords: 104-642E; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 3 datasets
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