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  • PANGAEA  (4,405)
  • Annual Reviews  (2,282)
  • 1980-1984  (6,434)
  • 1940-1944  (253)
  • 1
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 686 data points
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  • 2
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 351 data points
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  • 3
    Publication Date: 2018-09-27
    Type: Dataset
    Format: text/tab-separated-values, 349 data points
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  • 4
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 171 data points
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  • 5
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 342 data points
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  • 6
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 186 data points
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  • 7
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 869 data points
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  • 8
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 166 data points
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  • 9
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 35 data points
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  • 10
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 8 data points
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  • 11
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 8 data points
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  • 12
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    PANGAEA
    In:  Supplement to: Stauffer, Bernhard (1981): Die Zusammensetzung der Luft in natürlichem Eis. Zeitschrift für Gletscherkunde und Glazialgeologie, 17(1), 57-78, hdl:10013/epic.40237.d001
    Publication Date: 2018-09-27
    Description: The air trapped in freshly formed ice gives information concerning the ice formation processes as weH as concerning severa,l environmental parameters at the time of ice formation. Air arnount, air composition, and the size and form of bubbles may change with time. Possible processes responsible for such changes are discussed. In very cold ice air content and air composition remain almost unchanged. Samples of ancient atmospheric air are therefore very weH preserved in cold ice. In temperate ice changes of the air amount and air composition depend on the intergranular water fiow through the glacier. This waterfiow can be estimated by measuring air amount and air composition in ice sampIes.
    Type: Dataset
    Format: text/tab-separated-values, 50 data points
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  • 13
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    PANGAEA
    In:  Supplement to: Stauffer, Bernhard (1981): Mechanismen des Lufteinschlusses in natürlichem Eis. Zeitschrift für Gletscherkunde und Glazialgeologie, 17(1), 17-56, hdl:10013/epic.40236.d001
    Publication Date: 2018-09-27
    Description: Natural ice is formed by freezing of water or by sintering of dry or wet snow. Each of these processes causes atmospheric air to be enclosed in ice as bubbles. The air amount and composition as well as the bubble sizes and density depend not only on the kind of process but also on several environmental conditions. The ice in the deepest layers of the Greenland and thc Antarctic ice sheet was formed more than 100 000 years ago. In the bubbles of this ice, samples of atmospheric air from that time are preserved. The enclosure of air is discussed for each of the three processes. Of special interest are the parameters which control the amount and composition of the enclosed air. If the ice is formed by sintering of very cold dry snow, the air composition in the bubbles corresponds with good accuracy to the composition of atmospheric air.
    Type: Dataset
    Format: text/tab-separated-values, 57 data points
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  • 14
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 5 data points
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  • 15
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 41 data points
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  • 16
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 521 data points
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  • 17
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 1144 data points
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  • 18
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 403 data points
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  • 19
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 10 data points
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  • 20
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 3 data points
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  • 21
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 176 data points
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  • 22
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    In:  Supplement to: Patzelt, Gernot (1982): Die Gletscher der österreichischen Alpen 1981/82. Zeitschrift für Gletscherkunde und Glazialgeologie, 18(2), 175-190, hdl:10013/epic.40231.d001
    Publication Date: 2019-01-30
    Description: Im Berichtsjahr wurden 17 Gletscherberichte mit insgesamt 215 Seiten und 351 Fotos abgegeben, aus denen der vorliegende Sammelbericht zusammengestellt wurde. Mit den gegenüber dem Vorjahr stark vermehrten Fotos (plus 121 Stück) wird die außergewöhnliche Ausaperung des Jahres 1982 sehr gut dokumentiert. Das Beobachtungsnetz ist um 6 Gletscher erweitert worden.
    Type: Dataset
    Format: text/tab-separated-values, 724 data points
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  • 23
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 230 data points
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  • 24
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 48 data points
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  • 25
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 37 data points
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  • 26
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 74 data points
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  • 27
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 78 data points
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  • 28
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 73 data points
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  • 29
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 127 data points
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  • 30
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 165 data points
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  • 31
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 59 data points
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  • 32
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 11 data points
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  • 33
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 158 data points
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  • 34
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 167 data points
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  • 35
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 105 data points
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  • 36
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 7 data points
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  • 37
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 66 data points
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  • 38
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 24 data points
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  • 39
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 14 data points
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  • 40
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 34 data points
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  • 41
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 32 data points
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  • 42
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 10 data points
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  • 43
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 34 data points
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  • 44
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    PANGAEA
    In:  Supplement to: Mukhopadhyay, Prasanta K; Spiro, Baruch; Rullkötter, Jürgen (1984): An inertinite-rich coal lenticle in Triassic sediment of sample 547B-35, CC, Deep Sea Drilling Project Leg 79. In: Hinz, K; Winterer, EL; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 79, 493-495, https://doi.org/10.2973/dsdp.proc.79.115.1984
    Publication Date: 2018-09-27
    Description: A lenticle of organic matter in a piece of dolomite rock embedded in Triassic sandy mudstone of Core 547B-35 (DSDP Leg 79) was identified as inertinite-rich coal by organic petrography and analytical pyrolysis. About 95% of the organic matter recognized under the microscope consists of pyrofusinite, degradofusinite, and inertodetrinite. Gaseous hydrocarbons evolved during pyrolysis are rich in methane and are characteristic of inertinitic material. The organic matter is suggested to be a piece of redeposited Permian Gondwana coal.
    Type: Dataset
    Format: text/tab-separated-values, 33 data points
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  • 45
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 1182 data points
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  • 46
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 243 data points
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  • 47
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 89 data points
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  • 48
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 7 data points
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  • 49
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 9 data points
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  • 50
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 1101 data points
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  • 51
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 54 data points
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  • 52
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 678 data points
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  • 53
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 17 data points
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  • 54
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    PANGAEA
    In:  Supplement to: Galimov, Erik M; Kvenvolden, Keith A (1983): Concentrations and carbon isotopic compositions of CH4 and CO2 in gas from sediments of the Blake Outer Ridge, Deep Sea Drilling Project Leg 76. In: Sheridan, RE; Gradstein, FM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 76, 403-407, https://doi.org/10.2973/dsdp.proc.76.110.1983
    Publication Date: 2019-01-26
    Description: The principal gaseous carbon-containing components identified in the first 400 m of sediment at Deep Sea Drilling Project Site 533, Leg 76, are methane (CH4) and carbon dioxide (CO2). Below a sub-bottom depth of about 25 m, sediment cores commonly contained pockets caused by the expansion of gas upon core recovery. The carbon isotopic composition (d13C per mil relative to PDB standard) of CH4 and CO2 in these gas pockets has been measured, resulting in the following observations: (1) d13C-CH4 values increase with depth from approximately -94 per mil in the uppermost sediment to about -66 per mil in the deepest sediment, reflecting a systematic but nonlinear depletion of 12C with depth. (2) d13C-CO2 values also increase with depth of sediment from about -25 per mil to about -4 per mil, snowing a depletion of 12C that closely parallels the trend of the isotopic composition of CH4. The magnitude and parallel distribution of d13C values for both CH4 and CO2 are consistent with the concept that the formation of the CH4 resulted from the microbiological reduction of CO2 from organic substances. These results imply that CH4 and CO2 incorporated in gas hydrates at this site are biogenic.
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  • 55
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    PANGAEA
    In:  Supplement to: Chamley, Hervè; Debrabant, Pierre; Candillier, Anne-Marie; Foulon, J (1983): Clay mineralogical and inorganic geochemical stratigraphy of Blake-Bahama Basin since the Callovian, Site 534, Deep Sea Drilling Project Leg 76. In: Sheridan, RE; Gradstein, FM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 76, 437-451, https://doi.org/10.2973/dsdp.proc.76.113.1983
    Publication Date: 2019-04-16
    Description: Mineralogical and geochemical investigations carried out on Callovian to upper Cenozoic basalt and sediments of Hole 534A are the bases for paleoenvironmental interpretations. The clay mineralogy primarily reflects events that occurred on the American continent (tectonics, morphology, alteration and pedogenesis, climate), except in the basalt and at the precise basalt/sediment contact where in situ alteration and local metamorphic effects exist. The inorganic and organic geochemistry mainly reflects the influence of and increasing distance from the spreading center during the first stages of sedimentation, the terrigenous influence from the Valanginian upward, and the bottom reducing or oxidizing conditions linked to the widening and deepening of the ocean affected by global tectonics.
    Type: Dataset
    Format: text/tab-separated-values, 1893 data points
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  • 56
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 45 data points
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  • 57
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 9 data points
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  • 58
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    PANGAEA
    In:  Supplement to: Habib, Daniel (1983): Sedimentation-rate-dependent distribution of organic matter in the North Atlantic Jurassic-Cretaceous. In: Sheridan, RE; Gradstein, FM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 76, 781-794, https://doi.org/10.2973/dsdp.proc.76.139.1983
    Publication Date: 2018-09-27
    Description: The kind, sedimentation rate, and diagenesis of organic particles delivered to the North Atlantic seafloor during the Middle Jurassic-Early Cretaceous were responsible for the presence of carbonaceous sediments in Hole 534A. Organic-rich black clays formed from the rapid supply of organic matter; this organic matter was composed of either abundant, well-preserved, and poorly sorted particles of land plants deposited in clays and silty clays within terrigenous turbiditic sequences (tracheal facies) or abundant amorphous debris (xenomorphic facies) generated through the digestive tracts of marine zooplankton and sedimented as fecal pellets. Evidence for the fecal-pellet origin of xenomorphic debris is illustrated. Black clays were also produced in sediments containing less organic matter as a result of the black color of carbonized particles composing all or most of the residues (micrinitic facies). Slowly sedimented hematitic Aptian clays contain very little carbonized, organic debris that survived diagenetic oxidation. In the red calcareous clay sequence of the Late Jurassic, larger amounts of this oxidized debris turned several clay layers black or blackish red. Carbonized debris also dominates the residues recovered in interbedded black and green Albian clays. Carbonization of organic matter in these sediments either turned them black or provided the diagenetic environment for reduced iron. Carbonized debris is also appreciable in burrow-mottled black-green Kimmeridgian clay. The study of Hole 534A organic matter indicates that during the middle Callovian there was a rapid supply of terrigenous organic matter, followed by a late Callovian episode of rapidly supplied xenomorphic debris deposited as fecal pellets. The Late Jurassic-Berriasian was a time of slower sedimentation of organic matter, primarily of a marine dinoflagellate flora in a poorly preserved xenomorphic facies variously affected by diagenetic oxidation. Several intervals of carbonized tracheal tissue in the Oxfordian and Kimmeridgian suggest episodes of oxidized terrigenous matter. The same sequence of Callovian organic events is evident in much of the Early Cretaceous
    Type: Dataset
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  • 59
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    PANGAEA
    In:  Supplement to: Fütterer, Dieter K (1984): Pithonelloid calcareous dinoflagellates from the upper Cretaceous and Cenozoic of the southeastern Atlantic Ocean, Deep Sea Drilling Project Leg 74. In: Moore, TC Jr; Rabinowitz, PD; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 74, 533-541, https://doi.org/10.2973/dsdp.proc.74.111.1984
    Publication Date: 2018-09-27
    Description: Two new species, three new forms in open nomenclature and two previously known species of the genus Pithonella (sensu Bolli, 1974), attributed to the dinoflagellate family Peridiniaceae are described from Upper Cretaceous to lower Pleistocene sediments of the Walvis Ridge, southeastern Atlantic Ocean. It is the first time that pithonelloid calcareous dinoflagellates are described from sediment younger than early Paleocene.
    Type: Dataset
    Format: text/tab-separated-values, 513 data points
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  • 60
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    PANGAEA
    In:  Supplement to: Petersen, Nikolai P (1984): Ore mineralogy of South Atlantic basalts (Deep Sea Drilling Project Leg 73). In: Hsü, KJ; LaBrecque, JL; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 73, 603-606, https://doi.org/10.2973/dsdp.proc.73.122.1984
    Publication Date: 2019-04-16
    Description: The samples investigated in this study come from DSDP Leg 73 Drill Holes 519A, 522B, and 524, all of which are in the South Atlantic. A general petrographic description of the basalts is given by Carman et al. (1984; doi:10.2973/dsdp.proc.73.120.1984).
    Type: Dataset
    Format: text/tab-separated-values, 315 data points
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  • 61
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    PANGAEA
    In:  Supplement to: Finger, Willi (1984): Carbonate dissolution facies of late Miocene to Pleistocene sediments from Leg 73, Sites 519 and 520 (South Atlantic). In: Hsü, KJ; LaBrecque, JL; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 73, 765-769, https://doi.org/10.2973/dsdp.proc.73.137.1984
    Publication Date: 2018-09-27
    Description: The dissolution fades of 68 sediment samples from Leg 73 were determined by analyzing carbonate content and grain size. All sediments (Miocene to Pleistocene) from Site 519 and the Pliocene sediments from Site 520 were eolytic or oligolytic; that is, they were deposited above the lysocline. Miocene sediments from Site 520 were mesolytic or pleistolytic (deposited below the lysocline).
    Type: Dataset
    Format: text/tab-separated-values, 952 data points
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  • 62
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    PANGAEA
    In:  Supplement to: Renard, Maurice; Richebois, Gilbert; Létolle, René (1983): Trace element and stable isotope geochemistry of Paleocene to Coniacian carbonate samples from Hole 516F, comparison with North Atlantic and Tethys Sites. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 399-420, https://doi.org/10.2973/dsdp.proc.72.111.1983
    Publication Date: 2019-04-16
    Description: This paper presents data on trace elements (Sr, Mg, Na, K, Mn, Fe, Ni, Cr) and isotopes (13C, 18O) on the carbonate fraction of bulk sediments from the Coniacian to Paleocene samples of Hole 516F. Relationships of trace elements to mineralogy and stratigraphic position are discussed at length, with special emphasis on 1) the differences between Hole 516F and other oceanic sites, and 2) the transitions observed at the Cretaceous/Tertiary boundary. Isotope data are compared to those obtained in other localities of the same age. The sections show the same major 13C variations at the Cretaceous/Tertiary boundary, indicating that this event is a planetary phenomenon.
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    Format: text/tab-separated-values, 988 data points
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  • 63
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    PANGAEA
    In:  Supplement to: Benson, Richard H; Peypouquet, Jean Pierre (1983): The upper and mid-bathyal Cenozoic ostracode faunas of the Rio Grande Rise found on Leg 72 Deep Sea Drilling Project. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 805-818, https://doi.org/10.2973/dsdp.proc.72.137.1983
    Publication Date: 2018-09-27
    Description: From the study of the ostracodes of Sites 516, 517, and 518 in comparison with those of Sites 21, 22, and 357, we can show that a time lag (early to late Oliogene) existed between the formation of the deep water masses (mid-bathyal ± 2000 m) and those of intermediate depths (upper bathyal ± 1000 m). The ostracode faunas suggest that while the Antarctic Intermediate Water (O2 = 4.5 to 5 ml/l) was flowing through the Vema Trough to fill the northern basins, the returning less-dense, warmer water (O2 = 3.5 to 5 ml/l) originating in Tethys was being gradually displaced upslope. Efforts to identify shallow (less than 200 m) faunas were unsuccessful. No evidence of significant changes in paleodepth or close proximity to islands could be found that could not be better explained by water-mass changes. Studies of the genera Poseidonamicus and Krithe suggest an important water mass change at about 14 Ma (late-middle Miocene), but the cause of this event is not yet understood.
    Type: Dataset
    Format: text/tab-separated-values, 1071 data points
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  • 64
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    PANGAEA
    In:  Supplement to: Bode, Gerald W (1984): Appendix I. Carbon and carbonate analyses. In: Hsü, KJ; LaBrecque, JL; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 73, 789-790, https://doi.org/10.2973/dsdp.proc.73.app1.1984
    Publication Date: 2018-09-27
    Description: Leg 73 sediments were analyzed for total carbon and acid-insoluble (organic) carbon, using the LECO WR-12 analyzer, according to the standard techniques.
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    Format: text/tab-separated-values, 540 data points
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  • 65
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    PANGAEA
    In:  Supplement to: McKenzie, Judith A; Weissert, Helmut J; Poore, Richard Z; Wright, Ramil; Percival, Stephen F Jr; Oberhänsli, Hedi; Casey, Martin (1984): Paleoceanographic implications of stable-isotope data from upper Miocene–lower Pliocene sediments from the Southeast Atlantic (Deep Sea Drilling Project Site 519). In: Hsü, KJ; LaBrecque, JL; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 73, 717-724, https://doi.org/10.2973/dsdp.proc.73.132.1984
    Publication Date: 2019-01-27
    Description: A stable-isotope stratigraphy was established for planktonic and benthic foraminifers from upper Miocene-lower Pliocene pelagic sediments from the Mid-Atlantic Ridge. A correlation of stable-isotope and biostratigraphic data with magnetostratigraphic age revealed the following: (1) the late Miocene carbon-isotope shift in the South Atlantic bottom waters was minute compared with the shift reported for other deep-sea locations (Haq et al., 1980), (2) a significant cooling or continental ice-volume increase occurred between 5.7 and 5.2 Ma, and (3) a period of warming or ice-volume decrease followed, with the rate of warming increasing beginning at 4.5 Ma and reaching a climax at 4.3 Ma. The timing of these paleoceanographic events is correlated with the onset and termination of the Messinian salinity crisis in the Mediterranean Sea.
    Type: Dataset
    Format: text/tab-separated-values, 373 data points
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  • 66
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    In:  Supplement to: Gieskes, Joris M; Sirocky, Frank X; LaKind, Judy (1983): Interstitial water studies, Leg 72. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 391-394, https://doi.org/10.2973/dsdp.proc.72.109.1983
    Publication Date: 2018-09-27
    Description: Interstitial waters collected at Sites 515 and 516 during DSDP Leg 72 have been analyzed for major and minor constituents. At both sites increases in dissolved calcium and decreases in dissolved magnesium with depth imply reactions in the sediment column involving these constituents. It is suggested that these concentration changes are related to reactions involving biogenic silica transformation.
    Type: Dataset
    Format: text/tab-separated-values, 286 data points
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  • 67
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    In:  Supplement to: Emelyanov, Emelyan M; Trimonis, Egidius S (1983): Geochemical investigation of sediments from the Brazil Basin and the Rio Grande Rise. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 421-442, https://doi.org/10.2973/dsdp.proc.72.112.1983
    Publication Date: 2019-04-16
    Description: The distributions of calcium carbonate, of amorphous silica, and of 21 chemical compounds and elements in sediments of Holes 515A, 515B, 516, 516F, 517, and 518 are highly nonuniform; they change depending on the sediment types, grain size, and mineral composition. The main source of the lithogenous elements (K, Li, Rb, Fe, Ti, Zr, Ni, Cr, Sn) is terrigenous matter of South America. These elements correlate well or at least satisfactorily with each other and with the sum of clay minerals. CaCO3, amorphous SiO2 and organic C form a second group, the main source of which is biota of the ocean. Zn, Cu, Ba, Mo, (V, Na) are a third group, which is supplied by both terrigenous and biogenic matter. Judging by the distribution of chemical elements and components in sediments of Site 515, this area of the Brazil Basin is characterized by the rather constant conditions of pelagic terrigenous sedimentation from upper Eocene till Holocene. Small changes in chemical composition of sediments throughout the section are linked mainly to the evolution of subaerial source provinces, changes in hydrodynamic regime, and fluctuations of the ocean level. The chemical composition of sediments from the Rio Grande Rise sites suggests the existence of three main stages of sedimentation in this area. The first stage is the initial period of sediment accumulation on basalts at the beginning of the Late Cretaceous. Then followed sedimentary conditions notable for their sharp changes in chemical composition and type. Beginning in the middle Eocene and persisting into the Holocene, stable conditions of sedimentation characterize a third stage, represented by the formation of approximately 700 m of nannofossil oozes of rather monotonous chemical composition.
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    Format: text/tab-separated-values, 3399 data points
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  • 68
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    In:  Supplement to: Thompson, Geoffrey; Humphris, Susan E; Schilling, Jean-Guy (1983): Petrology and geochemistry of basaltic rocks from Rio Grande Rise, South Atlantic: Deep Sea Drilling Project Leg 72, Hole 516F. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 457-466, https://doi.org/10.2973/dsdp.proc.72.115.1983
    Publication Date: 2019-04-16
    Description: Basalts from Hole 516F, DSDP Leg 72 on the Rio Grande Rise are tholeiitic in character but differ from normal mid-ocean ridge basalts in the South Atlantic in higher concentrations of incompatible elements such as Ti, K, V, Sr, Ba, Zr, Nb, and light rare-earth elements and in lower concentrations of Mg, Cr, and Ni. They contrast with previously reported basalts from the Rio Grande Rise, which were highly alkalic in character. The Rio Grande Rise basalts from Hole 516F (age 84.5 Ma) are generally similar to basalts from the eastern end of the Walvis Ridge (80-100 Ma). It is suggested that they either originated, like the Walvis Ridge, from a mantle hot spot that is different from the present-day hot spot (Tristan da Cunha) and that has changed composition with time, or from a spreading center that was shallow and chemically influenced by the adjacent hot spot, similar to the present-day Mid-Atlantic Ridge near the Azores and Tristan da Cunha.
    Type: Dataset
    Format: text/tab-separated-values, 511 data points
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  • 69
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    In:  Supplement to: Weaver, Barry L; Marsh, Nicholas G; Tarney, J (1983): Trace element geochemistry of basaltic rocks recovered at Site 516, Rio Grande Rise, Deep Sea Drilling Project Leg 72. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 451-456, https://doi.org/10.2973/dsdp.proc.72.114.1983
    Publication Date: 2019-04-16
    Description: The geochemistry of basalts recovered during Leg 72 is described with emphasis on trace elements. Only Hole 516F penetrated basement; the basalts recovered are plagioclase-phyric and olivine-phyric and pervasively altered. Chemically, the basalts from Hole 516F are rather uniform in composition. However, four distinct geochemical units can be recognized, although the chemistry of two of the units appears to be controlled by chemical mobility associated with alteration. The two less-altered units cannot be related by fractional crystallization processes. Hole 516F basalts have a trace element chemistry characteristic of T-type mid-ocean ridge basalt; rare-earth element patterns (as indicated by Ce/Y ratios) are mildly fractionated flight rare-earth element enriched), and a number of incompatible element ratios are close to chondritic.
    Type: Dataset
    Format: text/tab-separated-values, 612 data points
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  • 70
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    In:  Supplement to: Tjalsma, R C (1983): Eocene to Miocene benthic foraminifers from DSDP Site 516, Rio Grande Rise, South Atlantic. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 731-755, https://doi.org/10.2973/dsdp.proc.72.133.1983
    Publication Date: 2018-12-20
    Description: DSDP Site 516 contains a complete middle Eocene to lower Miocene interval with a well-developed Oligocene sequence that is more than 300 m thick. In this paper, the most important and characteristic benthic foraminiferal species from this interval are described and illustrated, and their quantitative and biostratigraphic distribution is given. Middle Eocene benthic assemblages, derived from pelagic intercalations in a partly turbiditic sequence, are low in diversity. Benthic assemblages of fairly high diversity occur in limestones, chalks, and oozes of the upper Eocene to lower Miocene. The consistently high rate of new species appearances at Site 516 during late Eocene and Oligocene contrasted greatly with the very slow rate of change in abyssal faunas at that time; there were no significant faunal changes at the Eocene/Oligocene boundary. The assemblages are dominated by Cibicidoides (mostly C. ungerianus or C. kullenbergi) and Lenticulina. Buliminids were also important during the Eocene and early Oligocene. Faunal comparison with other Atlantic DSDP sites and drill holes in the Gulf of Mexico suggest an approximately mid-bathyal (500-1500 m) depth of deposition during late Eocene and Oligocene.
    Type: Dataset
    Format: text/tab-separated-values, 2414 data points
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  • 71
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    In:  Supplement to: Dailey, Donald H (1983): Late Cretaceous and Paleocene benthic foraminifers from Deep Sea Drilling Project Site 516, Rio Grande Rise, western South Atlantic Ocean. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 757-782, https://doi.org/10.2973/dsdp.proc.72.134.1983
    Publication Date: 2019-03-15
    Description: Benthic foraminifers of the Coniacian-Santonian through the Paleocene were recovered from a continuous pelagic carbonate section from Hole 516F on the Rio Grande Rise. Sixty-five genera and 153 species have been identified, most of which have been reported from other localities. Bathyal depths are reflected in the benthic assemblages dominated by gavelinellids (Gavelinella beccariiformis, G. velascoensis), Nuttallides truempyi, and various gyroidinids and buliminids. Rapid subsidence during the Coniacian-Santonian from nearshore to upper to middle bathyal depths was followed by much reduced subsidence, with the Campanian-Paleocene interval accumulating at middle bathyal to lower bathyal depths. A census study based on detailed sampling reveals major changes in benthic faunal composition at the Cretaceous/Tertiary boundary transition. It was a time of rapid turnover, with the extinctions of numerous species and the introduction of many new species. Overall, species diversity decreases about 20%, and approximately one-third of latest Maestrichtian species do not survive to the end of the Cretaceous. This shift indicates a significant environmental change in the deep sea, the precise nature of which is not apparent from the foraminifers or their enclosing sediments.
    Type: Dataset
    Format: text/tab-separated-values, 10465 data points
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  • 72
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    In:  Supplement to: Langseth, Marcus G; Ludwig, William J (1983): A heat flow measurement on the Falkland Plateau. In: Ludwig, WJ; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 71, 299-303, https://doi.org/10.2973/dsdp.proc.71.109.1983
    Publication Date: 2019-04-30
    Description: At Hole 511, on the margin of Maurice Ewing Bank, eastern Falkland Plateau, successful bottom hole temperature measurements were made at 52.5 and 113 meters below the seafloor. The results show a regular increase of temperature with depth of 0.074 °C m**-1. Conductivity measurements on core samples, made on board ship and at the Lamont-Doherty repository, gave a mean value of 0.842 W °C**-1 m**-1. The heat flow indicated by these observations is 62.3 mW m**-2 (1.49 HFU), a value that is compatible with the geological evolution of the plateau.
    Type: Dataset
    Format: text/tab-separated-values, 93 data points
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  • 73
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    In:  Supplement to: Barker, Peter F (1983): Tectonic evolution and subsidence history of the Rio Grande Rise. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 953-976, https://doi.org/10.2973/dsdp.proc.72.151.1983
    Publication Date: 2018-09-27
    Description: Drilling at Site 516 on the northern shoulder of the main Rio Grande Rise has improved our understanding of the tectonic evolution and subsidence history of the Rise and of the entire Rio Grande-Walvis seamount and aseismic ridge system. Evidence from this site indicates that basalts at the bottom of Hole 516F were produced at the ridge crest and that the ridge crest was subaerial. I attribute the anomalous elevation of the Rise to an eastward ridge crest jump to the western end of the Rise, 91 Ma, and, recognizing a southward progression of such eastward jumps, I suggest a model for the Rio Grande-Walvis system involving a slow westward component of drift of the ridge crest off a hot-spot swell. This drift caused off-axis volcanism that in the Cretaceous succeeded but in the Cenozoic failed to capture the ridge crest. The probable mechanism of capture involved counteraction of the ridge push force within the lithosphere by a swell push force. This would make capture more likely in lithosphere produced by fast spreading, perhaps explaining the change of mode at the end of the Cretaceous. Within the pelagic carbonate sedimentary succession at Site 516, the partly volcaniclastic, turbiditic middle Eocene Unit 4 contains volcanic ash beds (yielding a 47.4 ± 0.7 Ma K-Ar age from fresh alkalic biotite) and a 15-m-thick basal slide. Reflection profiles show it was produced by sliding from and by subaerial erosion of a large tilted and uplifted guyot upslope from the site. Data from the site suggest that a single short off-axis event affected the entire crestal region of the Rise. Perhaps the same midplate hot spot that produced an 80-50 Ma volcanic episode in the Serra Geral of Brazil was responsible, but that was not the present Tristan hot spot. The data from Site 516 have been incorporated into a detailed model for the subsidence history of the main body of the Rise. The model uses an "oceanic" thermal isostatic model, but accounts for the effect of subaerial subsidence and incorporates the changes of the middle Eocene event. A detailed sediment compaction model is developed, and a smooth eustatic sea level correction is applied. The effects of "basement compaction" and use of local rather than regional isostatic compensation are assessed each at about 50 m. The computed paleodepth at Site 516 ranges from sea level 84.0 Ma through a Paleocene 1250 m maximum and middle Eocene 600 m minimum to 1313 m today. The "tectonic" depth curves for both Sites 516 and 357 are compared with paleoecologic depth estimates. In general, these paleoecologic estimates lie deeper, probably because of the difficulties of applying accurate subsidence and compaction corrections to the comparison sites.
    Type: Dataset
    Format: text/tab-separated-values, 55 data points
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  • 74
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    In:  Supplement to: Muza, Jay Phillip; Wise, Sherwood W (1983): An authigenic gypsum, pyrite, and glauconite association in a Miocene deep sea biogenic ooze from the Falkland Plateau, Southwest Atlantic Ocean. In: Ludwig, WJ; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 71, 361-375, https://doi.org/10.2973/dsdp.proc.71.114.1983
    Publication Date: 2018-09-27
    Description: Authigenic gypsum, pyrite, and glauconite are disseminated throughout an unusually long (346 m) Miocene section of mixed biogenic carbonate and diatomaceous ooze drilled on the Falkland Plateau at DSDP Site 329 (water depth, 1519 m). The present organic carbon content of the sediment is low, ranging between 0.1 and 0.7%. Gypsum occurs as euhedral single or twinned crystals of selenite up to 5 mm in diameter, sometimes in the form of gypsum rosettes. These crystals are intact and unabraded, comprising up to 4% of the washed sample. The authigenic nature of the gypsum is demonstrated by the presence of diatoms and radiolarians embedded within the gypsum crystals. The gypsum co-occurs with pyrite and glauconite in these samples. The pyrite occurs as framboids, foraminiferal infillings, rods, and granular sheetlike masses composed of pyrite octahedra. The glauconite occurs as foraminiferal infillings and as free grains. The gypsum and pyrite were identified by energy-dispersive X-ray analysis and scanning electron micrographs. Some of the gypsum has grown on pyrite, indicating that it precipitated after the pyrite, perhaps in response to a change in pH conditions. The formation of the mineral suite can be explained by current models of in situ sulfide and sulfate precipitation coincident with diagenesis and oxidation of much of the original organic carbon.
    Type: Dataset
    Format: text/tab-separated-values, 48 data points
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  • 75
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    In:  Supplement to: Wind, Frank H; Wise, Sherwood W (1983): Correlation of upper Campanian–lower Maestrichtian calcareous nannofossil assemblages in drill and piston cores from the Falkland Plateau, Southwest Atlantic Ocean. In: Ludwig, WJ; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 71, 551-563, https://doi.org/10.2973/dsdp.proc.71.122.1983
    Publication Date: 2019-03-20
    Description: Calcareous nannofossils from upper Campanian-lower Maestrichtian Deep Sea Drilling Project Leg 71 Cores 511-23 and 511-24 are described and correlated with assemblages of similar age from piston and drill cores on the Falkland Plateau, South Atlantic Ocean. The Leg 71 cores partially fill a drilling gap of at least 20 meters left within a thick (50 m) carbonate section first drilled by DSDP Leg 36 at Site 327. Cores 511-23 and 511-24 both fall within the upper portion of the Biscutum coronum Zone of Wind and demonstrate an overlap in the range of Monomarginatus quaternarius with the ranges of M. pectinatus, Misceomarginatus pleniporus, and Biscutum coronum across the Campanian/ Maestrichtian boundary. Resolution of the sequence of highest occurrence datums for the latter species must await the recovery of a more complete section. Comparison of the Site 511 assemblages with those from Mas Orcadas Core 07-75-44 to the north confirms earlier speculation that the Falkland Plateau served as an important boundary between major water masses during the Late Cretaceous.
    Type: Dataset
    Format: text/tab-separated-values, 725 data points
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  • 76
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    In:  Supplement to: Bode, Gerald W (1983): Appendix II. Carbon and carbonate analyses. In: Ludwig, WJ; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 71, 1185-1187, https://doi.org/10.2973/dsdp.proc.71.app2.1983
    Publication Date: 2018-09-27
    Description: Leg 71 sediments were analyzed for total carbon and acid-insoluble (organic) carbon, using the Leco WR-12 analyzer, according to the standard technique outlined below. The 3 cm**3 sediment samples were first dried and ground into a homogeneous powder. The ground sediment was redried at 105 to 110°C, and two samples, a 0.1 g and a 0.5 g sample, were weighed into Leco clay crucibles. The 0.5 g sample was acidified with 10% hydrochloric acid and washed with distilled water. The sample was then dried and analyzed for acid-insoluble carbon. The 0.1 g sample was analyzed for total carbon without further treatment. If the sample contained less that 10% CaCO3, an additional 0.5 g sample was analyzed for greater accuracy. The calcium carbonate percentages were calculated as follows: (% total C - % organic C) x 8.33 = % CaCO3. Although other carbonates may be present, all acid-soluble carbon was calculated as calcium carbonate.
    Type: Dataset
    Format: text/tab-separated-values, 1096 data points
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  • 77
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    In:  Supplement to: Bornhold, Brian D (1983): Appendix I. Detailed textural analyses of Miocene to Quaternary sediments, Leg 71. In: Ludwig, WJ; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 71, 1183-1184, https://doi.org/10.2973/dsdp.proc.71.app1.1983
    Publication Date: 2018-09-27
    Description: In conjunction with a study of ice-rafted detritus (IRD), textural analyses were carried out on Miocene to Quaternary sediments at Sites 511, 512, 513, and 514. Grain-size statistics were computed for the 〈62.5 µm fraction in order to identify changes in current velocity; the sand fraction was omitted from these determinations because it consists primarily of ice-raft and biogenic components. The contributions by terrigenous sediment in the 62.5-250 µm and the 〉250 µm fractions were determined.
    Type: Dataset
    Format: text/tab-separated-values, 2182 data points
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  • 78
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    In:  Supplement to: Moorby, S A; Cronan, David S (1983): Chemical composition of sediments from Sites 506, 507, 508, and 509, Leg 70, Deep Sea Drilling Project. In: Honnorez, J; Von Herzen, RP; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 70, 269-275, https://doi.org/10.2973/dsdp.proc.70.112.1983
    Publication Date: 2019-04-16
    Description: Since its discovery in 1974 (Klitgord and Mudie, 1974), the Galapagos mounds hydrothermal field has received much attention. Sediment samples were taken during Leg 54 of the Deep Sea Drilling Project (DSDP) and by other expeditions to the area (e.g., Corliss et al., 1978). While a hydrothermal origin for the mounds sediments has been generally accepted, several different theories of origin for the mounds themselves have been proposed (e.g., Corliss et al., 1978; Natland et al., 1979; Williams et al., 1979). One of the aims of DSDP Leg 70 was to return to the mounds field and, using the new hydraulic piston cor er described elsewhere in this volume, to obtain more complete recovery of mounds sediments than had previously been possible. It was our hope that this would help in our understanding of the nature and origin of these deposits. In this chapter, we describe the results of chemical analysis of over 250 sediment samples taken during the course of Leg 70.
    Type: Dataset
    Format: text/tab-separated-values, 70 data points
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  • 79
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    In:  Supplement to: von Herzen, Richard P; Francis, T J G; Becker, Keir (1983): In situ large-scale electrical resistivity of ocean crust, Hole 504B. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 237-244, https://doi.org/10.2973/dsdp.proc.69.106.1983
    Publication Date: 2018-10-17
    Description: The achievement of deep penetration (562 m) of seafloor basalts at Hole 504B, near the Costa Rica Rift (1°13.63'N, 83°43.81'W), on DSDP Legs 69 and 70 presented a rare opportunity to examine the structure of young (6 m.y.) oceanic crust. In addition to the recovery of samples for laboratory studies, an extensive suite of downhole logs and experiments was carried out at this site, for two main purposes: (1) to allow reliable deductions about the nature of the entire section of penetrated crust, because recovery of samples was far from complete (-25%); (2) to probe the physical state of rock around the drilled hole on a scale of tens of meters to kilometers. Information on the latter large-scale phenomena at Hole 504B were provided mainly by the oblique seismic experiment, utilizing a bore-hole seismometer (Stephen 1983), and by the large-scale-electrical- resistivity experiment described below.
    Type: Dataset
    Format: text/tab-separated-values, 40 data points
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  • 80
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    In:  Supplement to: Bukry, David (1983): Upper Cenozoic silicoflagellates from offshore Ecuador, Deep Sea Drilling Project Site 504. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 321-342, https://doi.org/10.2973/dsdp.proc.69.113.1983
    Publication Date: 2019-03-20
    Description: Diverse and abundant late Miocene to Pleistocene silicoflagellates at DSDP Site 504 can be correlated by tropical biostratigraphic zones and relative paleotemperature values to eastern tropical Pacific reference site DSDP 503A farther to the west. Early Pliocene assemblages, which were poorly known until now, are present and can be correlated locally between DSDP Holes 504, 503A, and 495, using species events associated with the new Dictyocha pulchella Subzone and Dictyocha angulata Subzone. Silicoflagellate relative paleotemperature values show major warming at 4.7 to 5.0 Ma (Cores 45-48), 3.4 to 3.8 Ma (Cores 32-33), 1.5 to 1.7 Ma (Cores 12-16), and 0.5 to 0.8 Ma (Cores 3-6). Major coolings occurred at 5.0 to 5.1 Ma (Core 51), 3.9 to 4.4 Ma (Cores 38-44), and 1.0 to 1.3 Ma (Cores 8-10). The appearance of Dictyocha longa is proposed to replace the asperoid/fibuloid ratio reversal as the bottom of the Dictyocha fibula Zone, because the non-evolutionary ratio reverses several times in the upper Miocene of Hole 503A, and at least once in Hole 504. Three new Pliocene silicoflagellates are defined: Dictyocha concinna Bukry, n. sp., D. helix Bukry, n. sp., and D. tamarae Bukry, n. sp.
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    Format: text/tab-separated-values, 3974 data points
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  • 81
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    In:  Supplement to: Alt, Jeffrey C; Honnorez, Jose J; Hubberten, Hans-Wolfgang; Saltzman, Eric S (1983): Occurrence and origin of anhydrite from Deep Sea Drilling Project Leg 70, Hole 504B, Costa Rica Rift. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 547-550, https://doi.org/10.2973/dsdp.proc.69.127.1983
    Publication Date: 2019-01-26
    Description: The first anhydrite reported from oceanic basalts occurs in altered basalts drilled during DSDP Leg 70 from Hole 504B. Anhydrite has been identified in several samples, two of which were studied in detail. Anhydrite in Sample 504B-40-3 (130-135 cm), which was acquired at 310 meters sub-basement, occurs in a dolerite at the center of a vug rimmed by saponite and calcite. Red iron-hydroxide-rich alteration halos occur from 0 to 310 meters sub-basement; primary sulfides in these halos are oxidized, and the rocks have lost large amounts of sulfur. The anhydrite in this sample has a d34S value of 18.5 per mil, and it is interpreted to have formed from a fluid containing a mixture of seawater sulfate (20.9 per mil) and basaltic sulfur (0 per mil) released during the oxidation of primary sulfides. Anhydrite in Sample 504B-48-3 (14-18 cm), which was found at 376 meters sub-basement, occurs intergrown with gyrolite at the center of a 1-cm-wide vein that is rimmed by saponite and quartz. At sub-basement depths below 310 meters to the bottom of the Leg 70 section (562 m sub-basement), the rocks exhibit the effects of anoxic alteration with common secondary pyrite. Anhydrite in Sample 504B-48-3 (14-18 cm) has a d34S value of 36.7 per mil, and it is interpreted to have formed from seawater-derived fluids enriched in 34S through sulfate reduction. Temperatures of alteration calculated from oxygen isotope data range from 60 to 100°C. Sulfate reduction may have occurred in situ, or elsewhere at higher temperature, possibly deeper in the crust. The secondary mineral paragenetic sequence indicates a progressive decrease in Mg and increase in Ca in the circulating fluids. This eventually led to anhydrite formation late in the alteration process.
    Type: Dataset
    Format: text/tab-separated-values, 18 data points
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  • 82
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    In:  Supplement to: Pertsev, Nikolay N; Boronikhin, V A (1983): Secondary K-feldspar in basalts at Deep Sea Drilling Project Hole 504B and the problem of K-feldspathization in oceanic basalts. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 589-591, https://doi.org/10.2973/dsdp.proc.69.132.1983
    Publication Date: 2018-09-27
    Description: Basalts from some holes of the Deep Sea Drilling Project contain secondary K-feldspar which forms pseudomorphs after calcic (〉76% An) Plagioclase cores, whereas Plagioclase of rims and microlites (68-74% An) remains unaltered. In basalts of Hole 504B two such grains with relics of Plagioclase in the central parts of phenocysts were recovered. The composition of the Plagioclase rims and of non-replaced phenocrysts is An79-81; the composition of relics is An83. The An and Ab contents of the K-feldspar is higher than in K-feldspar from altered basalt in Hole 418A in the Atlantic Ocean near the Bermuda Rise. Replacement of plagioclases by K-feldspar evidently is caused by oxygen-rich nearbottom sea water penetrating into basalts. The temperature interval of K-feldspathization is probably in the range 30 to 80°C, more-calcic Plagioclase being replaced by K-feldspar at higher temperatures.
    Type: Dataset
    Format: text/tab-separated-values, 249 data points
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  • 83
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    In:  Supplement to: Wilkens, Roy H; Christensen, Nikolas I; Slater, L (1983): High-pressure seismic studies of Leg 69 and 70 basalts. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 683-686, https://doi.org/10.2973/dsdp.proc.69.142.1983
    Publication Date: 2018-09-27
    Description: Shear-wave and compressional-wave velocities of 26 basalt samples collected at Site 504 during Deep Sea Drilling Project Legs 69 and 70 were measured at elevated confining pressures. The young basalts have higher velocities than average DSDP basalts, because of their lack of alteration. Measurements of sample porosity are combined with laboratory and in situ velocity measurements to yield estimates of total crustal porosity: 13% at the top of Layer 2, and very low porosity below a depth of 2.0 km.
    Type: Dataset
    Format: text/tab-separated-values, 2320 data points
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  • 84
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    In:  Supplement to: Kvenvolden, Keith A; Blunt, David J (1982): Amino acids in sediments from Leg 68 Site 502. In: Prell, WL; Gardner, JV; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 68, 475-480, https://doi.org/10.2973/dsdp.proc.68.122.1982
    Publication Date: 2018-12-14
    Description: In this chapter, we will report on the amino acids in the total acid hydrolysate of eight sediment samples from Leg 68 Site 502. This site was located on a topographic high at a depth of 3051 meters in the Colombian Basin of the western Caribbean Sea. Four holes were cored at the site by means of the hydraulic piston corer to a maximum sediment depth of 218 meters. The composite section is a virtually continuous, undisturbed sediment record covering almost 8 million years from the Holocene to late Miocene. Age estimates for the section are based on excellent magnetostratigraphic and biostratigraphic records. Four lithostratigraphic units (A, B, C, and D) were recognized, based on differences in color and content of clay, ash, foraminifers, and siliceous microfossils (Prell, Gardner, et al., 1980): A, yellowish brown to light brownish gray foraminifer-bearing (〉 10%) nannofossil marl; B, gray to olive gray foraminifer-bearing nannofossil marl with occasional ash beds; C, light gray to dark greenish gray calcareous clay and foraminifer-bearing (〈 10%) nannofossil marl; D, pale green to grayish green calcareous, ash-bearing clay with siliceous microfossils. The calcium carbonate content of these sediments increases from about 27 to about 49% from late Miocene to middle Pliocene (about 3.6 Ma) and remains uniform at about 48 to 50% from that time throughout the Quaternary. The eight sediment samples for amino acid analyses came from the third (502B) and fourth (502C) holes at Site 502. Samples ranged in sub-bottom depth from 4.3 to 225 meters spanning time from 0.3 to 7.7 Ma.
    Type: Dataset
    Format: text/tab-separated-values, 189 data points
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  • 85
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    In:  Supplement to: Gieskes, Joris M; Elderfield, Henry; Nevsky, Brad (1983): Interstitial water studies, Leg 65, Deep Sea Drilling Project. In: Lewis, BTR; Robinson, P; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 65, 441-449, https://doi.org/10.2973/dsdp.proc.65.118.1983
    Publication Date: 2019-01-28
    Description: Studies of the chemical composition of interstitial waters obtained at Sites 482, 483, 484, and 485 on DSPP Leg 65 have revealed the following: (1) Early diagenetic processes in these rapidly deposited sediments led to large decreases in dissolved sulfate and concomitant increases in dissolved ammonia and bicarbonate (alkalinity). Associated with these processes of biodegradation of organic matter are carbonate-precipitation reactions leading to minima in dissolved calcium. (2) In Sites 482, 483, and 485 a flux of dissolved calcium from the basalts of Layer 2 into the sediments is implied. This flux is diffusive in nature, and in none of the sites, drilled on very young oceanic crust, is there any evidence for convective motion of pore fluids in the sediment column. (3) As a result of elevated temperatures in the sediments (caused by relatively high heat flow on young oceanic crust), silica diagenesis occurs at a relatively early stage. This diagenesis is associated with processes involving the alteration of volcanic matter in the sediments (low dissolved 87Sr/86Sr), which results in decreases in dissolved silica, magnesium, and potassium, and increases in dissolved calcium, lithium, and strontium.
    Type: Dataset
    Format: text/tab-separated-values, 680 data points
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  • 86
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    In:  Supplement to: Spiker, Elliot C; Simoneit, Bernd R T (1982): Appendix III. Radiocarbon dating of sediments from the Cariaco Trench, Deep Sea Drilling Project Site 147. In: Watkins, JS; Casey Moore, J; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 66, 863-864, https://doi.org/10.2973/dsdp.proc.66.app3.1982
    Publication Date: 2018-09-27
    Description: Samples from Holes 147, 147A, and 147B have been dated by the radiocarbon method; ages ranged to 27,000 years ago at about 20 meters sub-bottom. The sedimentation rates were approximately 50 cm/10**3 y. for the last 5000 years and 10 to 75 cm/10**3 y. prior to that.
    Type: Dataset
    Format: text/tab-separated-values, 100 data points
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  • 87
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    In:  Supplement to: Gutiérrez-Estrada, Mario; Salisbury, Matthew H (1983): Physical properties of sediments from the mouth of the Gulf of California, Leg 65, Deep Sea Drilling Project. In: Lewis, BTR; Robinson, P; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 65, 675-684, https://doi.org/10.2973/dsdp.proc.65.134.1983
    Publication Date: 2018-10-11
    Description: The physical properties of 138 unconsolidated hemipelagic silty clays and turbidites from the mouth of the Gulf of California were analyzed in order to determine their grain size, shear strength, compressional wave velocity, porosity, specific gravity, wet-bulk density, water content, void ratio, and degree of saturation. As at other Deep Sea Drilling Project (DSDP) sites, the wet-bulk density, sonic velocity, and shear strength tended to increase with depth while the porosity and water content decreased in response to increasing compaction. The grain size and clay fraction varied irregularly with depth. The wet-bulk density ranged from 1.34 to 2.58 g/cm**3, while, the shear strength and compressional wave velocity ranged from 0.03 to 1.05 tons/ft.**2 and 1.47 to 4.25 km/s, respectively. The porosity varied between 8 and 79%, while the water content ranged from 28.0 to 175.6%; most samples were effectively 100% saturated. The specific gravity ranged from 1.71 to 3.24 and showed a tendency to be directly related to the wet-bulk density and thus inversely related to porosity. The physical properties of the hemipelagic sediments and turbidites are noticeably different, and the properties of both were modified by diagenesis near the basement.
    Type: Dataset
    Format: text/tab-separated-values, 1098 data points
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  • 88
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    In:  Supplement to: Day, Ron (1983): Paleomagnetism of igneous rocks from Deep Sea Drilling Project Sites 482, 483, and 485. In: Lewis, BTR; Robinson, P; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 65, 705-715, https://doi.org/10.2973/dsdp.proc.65.138.1983
    Publication Date: 2018-09-27
    Description: The principal objective of DSDP Leg 65 was to sample oceanic crust near the crest of the East Pacific Rise. The sites that we drilled, close to the mouth of the Gulf of California, are areas where the sedimentation rate is high and where high seismic velocities indicated that the basement could be successfully drilled. We occupied four sites (482-485) and drilled 15 holes, of which 8 reached basement. Although we attempted to drill re-entry holes at Sites 482 and 483, we lost them because of operational problems.
    Type: Dataset
    Format: text/tab-separated-values, 573 data points
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  • 89
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    In:  Supplement to: Swain, Frederick M; Bratt, Judy M (1982): Carbohydrate residues in Leg 64 Core Samples. In: Curray, JR; Moore, DG; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 64, 881-882, https://doi.org/10.2973/dsdp.proc.64.133.1982
    Publication Date: 2018-09-27
    Description: We analyzed 10 core samples of Pleistocene and Pliocene sediment for residual carbohydrates. All yielded positive results for total carbohydrates and acid-extractable glucose. We also detected galactose, mannose, arabinose, xylose, and traces of ribose and fucose in the Pleistocene samples. In the Pliocene samples we found only rare mannose. Only one Pleistocene sample yielded measurable cellulose and amylose.
    Type: Dataset
    Format: text/tab-separated-values, 145 data points
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  • 90
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    In:  Supplement to: Shackleton, Nicholas J; Hall, Michael A (1982): Oxygen isotope study of continuous scrape samples from Site 480. In: Curray, JR; Moore, DG; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 64, 1251-1254, https://doi.org/10.2973/dsdp.proc.64.165.1982
    Publication Date: 2019-01-27
    Description: During the cleaning of the HPC core surfaces from Hole 480 for photography, the material removed was conserved carefully in approximately 10 cm intervals (by K. Kelts); this material was made available to us in the hope that it would be possible to obtain oxygen isotope stratigraphy for the site. The samples were, of course, somewhat variable in size, but the majority were probably between 5 and 10 cm**3. Had this been a normal marine environment, such sample sizes would have contained abundant planktonic foraminifers together with a small number of benthics. However, this is clearly not the case, for many samples contained no foraminifers, whereas others contained more benthics than planktonics. Among the planktonic foraminifers the commonest species are Globigerina bulloides, Neogloboquadrina dutertrei, and N. pachyderma. A few samples contain a more normal fauna with Globigerinoides spp. and occasional Globorotalia spp. Sample 480-3-3, 20-30 cm contained Globigerina rubescens, isolated specimens of which were noted in a few other samples in Cores 3,4, and 5. This is a particularly solution-sensitive species; in the open Pacific it is only found widely distributed at horizons of exceptionally low carbonate dissolution, such as. the last glacial-to-interglacial transition.
    Type: Dataset
    Format: text/tab-separated-values, 301 data points
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