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  • American Meteorological Society (AMS)
  • PANGAEA
  • 1990-1994  (288)
  • 1980-1984  (42)
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  • 1
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    Unknown
    PANGAEA
    In:  Supplement to: Cyamex Scientific Team; Francheteau, Jean; Needham, H D; Choukroune, P; Juteau, Thierry; Séguret, Marie J M; Ballard, R D; Fox, P J; Normark, William R; Carranza, A; Cordoba, D; Guerrero, Gerardo; Rangin, Claude (1981): First manned submersible dives on the East Pacific Rise at 21�N (project RITA): General results. Marine Geophysical Research, 4(4), 345-379, https://doi.org/10.1007/BF00286034
    Publication Date: 2023-08-28
    Description: A submersible study has been conducted in February - March 1978 at the axis of the East Pacific Rise near 21°N. The expedition CYAMEX, the first submersible program to be conducted on the East Pacific Rise, is part of the French-American-Mexican project RITA (Rivera - Tamayo), a 3-year study devoted to detailed geological and geophysical investigations of the East Pacific Rise Crest. On the basis of the 15 dives made by CYANA in the axial area of the Rise, a morphological and tectonic zonation can be established for this moderately-fast spreading center. A narrow, 0.6 to 1.2 km wide zone of extrusion (zone 1), dominated by young lava flows, is flanked by a highly fissured and faulted zone of extension (zone 2) with a width of 1 to 2 km. Further out, zone 3 is dominated by outward tilted blocks bounded by inward-facing fault scarps. Active or recent faults extend up to 12 km from the axis of extrusion of the East Pacific Rise. This represents the first determination from direct field evidence of the width of active tectonism associated with an accreting plate boundary. Massive sulfide deposits, made principally of zinc, copper and iron, were found close to the axis of the Rise. Other signs of the intense hydrothermal activity included the discovery of benthic fauna of giant size similar to that found at the axis of the Galapagos Rift. We emphasize the cyclic character of the volcanicity. The main characteristics of the geology of this segment of the East Pacific Rise can be explained by the thermal structure at depth below this moderately-fast spreading center. The geological observations are compatible with the existence of a shallow magma reservoir centered at the axis of the Rise with a half-width of the order of 10 km.
    Keywords: CY78-16DF; CY78-17V; CY78-18V; CYAMEX; Cyana (Submersible); Deposit type; DEPTH, sediment/rock; Description; East Pacific Rise; Event label; Identification; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; OBSE; Observation; Position; Quantity of deposit; Sediment sample; Sediment type; SES; Substrate type; Visual description
    Type: Dataset
    Format: text/tab-separated-values, 21 data points
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  • 2
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    Unknown
    PANGAEA
    In:  Supplement to: Juteau, Thierry; Eissen, Jean-Philippe; Francheteau, Jean; Needham, David; Choukroune, P; Rangin, Claude; Séguret, Marie J M; Ballard, R D; Fox, P J; Normark, William R; Carranza, A; Cordoba, D; Guerrero, J (1980): Homogeneous basalts from the East Pacific Rise at 21° N: seady state magma reservoirs at moderately fast spreading centers. Oceanologica Acta, 3(4), 487-503, https://archimer.ifremer.fr/doc/00323/43430/
    Publication Date: 2023-08-28
    Description: Forty basaltic rocks collected by submersible during the Cyamex expedition (1978) on the East PacifIc Rise at 21°N, a moderately fast spreading segment (6 cm/year opening rate) of the mid-ocean ridge, consist of angular pillow fragments and glass buds, sheet-flow slabs and samples of columnar pillars standing in collapsed fossillava pools. Most of the rocks are from the crestal are a of the Rise. The collection shows a striking petrographic homogeneity wh en compared with the range of basalts found on other segments of midocean ridges: olivine-phyric, or highly plagioclase-phyric rocks, so common in the slowspreading Famous are a in the Atlantic, are absent. All samples are typical lowpotassium oceanic tholeiites with a limited fractionation trend. Pillow-lavas, thin and thick sheet-flows cannot be distinguished by their major element compositions, as in the Galapagos rift which has the same spreading rate as the EPR at 21°N. Further, ferrobasalts have been described from the Galapagos rift, but do not appear in the Cyamex rocks. In the Cyamex area, olivine and plagioclase are the main silicate phases, and clinopyroxene is absent. In the pillows and sheet-flow samples, four generations of olivine and plagioclase crystals are distinguished. Samples from the fossillava pools are aphyric. The corresponding magma batches are presumed to have migrated rapidly through the magma chamber, and to have been extruded in large volumes, possibly during episodes ofhigh instantaneous opening rate. Fe-Ni and Fe-Cu-rich sulphide phases are common in an lava types as massive globules scatterred through the glass, or as microglobules decorating the walls of empty vesicles. Palagonite and Fe-Mn oxide thicknesses across the strike of the Rise indicate relative ages compatible with successive extrusions at the Rise axis.
    Keywords: CY-78-07-12D; CY-78-10-17D; CY-78-10-18D; CY-78-11-26D; CY-78-12-35D; CY-78-13-42D; CY-78-13-43D; CY-78-13-44D; CY-78-15-55D; CY-78-15-56D; CY-78-16-57D; CY-78-16-58D; CY-78-17-60D; CY-78-17-61D; CY-78-18-63D; CY-78-18-65D; CY-78-18-66D; CY-78-19-69D; CY-78-20-76D; CYAMEX; Cyana (Submersible); Deposit type; DEPTH, sediment/rock; Description; East Pacific Rise; Elevation of event; Event label; Identification; Latitude of event; Longitude of event; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Percentage; Position; ROBA; Robotic arm; Sediment type; Substrate type; Visual description
    Type: Dataset
    Format: text/tab-separated-values, 108 data points
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  • 3
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    PANGAEA
    In:  Supplement to: Corrigan, Jeffrey D; Crowley, Kevin D (1990): Fission-track analysis of detrital apatites from Sites 717 and 718, Leg 116, central Indian Ocean. In: Cochran, JR; Stow, DAV; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 116, 75-92, https://doi.org/10.2973/odp.proc.sr.116.118.1990
    Publication Date: 2024-01-09
    Description: This paper presents fission-track ages and confined track-length measurements from detrital apatites recovered from Ocean Drilling Program Leg 116 Site 717 and 718 cores. We interpret these data in terms of the post-depositional thermal history at these two sites and the thermotectonic history of apatite source areas. Composite apatite samples were derived by combining fine-grained sand samples from Sites 717 and 718 cores over 70- to 120-m intervals over the total depth penetrated at Sites 717 (T.D. = 820 mbsf) and 718 (T.D. = 960 mbsf). Thirty apatite grains per composite sample from ten samples (at least every other sampled interval) were dated and track-length measurements (20-50 per sample) were obtained for all samples. Mean track lengths from Site 717 samples are statistically identical, ranging from 14.4 ± 0.4 to 14.8 ± 0.3 ?m (all errors are the 95% confidence interval), and mean fission-track ages increase monotonically downhole from 4.8 ± 1.1 to 14.3 ± 2.3 Ma. For Site 718, located approximately 7 km to the south of Site 717 on an adjacent fault block, mean track lengths to 560 mbsf are equivalent to those measured from Site 717 samples. A decrease in mean track length (14.6 ± 0.3 to 13.2 ± 0.4 µm) and a corresponding decrease in mean fission-track age (21.1 ± 2.9 to 15.8 ± 2.4 Ma) with depth for samples between 560 and 960 mbsf from Site 718 indicates that post-depositional downhole shortening of fission tracks at elevated temperatures has taken place. Track-length shortening, based on mean track lengths relative to an unannealed mean track length of 16.3 µm, is approximately 10% for all Site 717 samples and for samples from the upper 560 m of Site 718. The total amount of shortening of the lowermost sample from Site 718 is approximately 20%. Based on extrapolation of published laboratory annealing experiments, maximum isothermal time-temperature condition extremes that could produce this degree of annealing at the base of Site 718 are estimated to range from 50°C for a duration of 17 m.y. (since deposition) to 55°C for a duration of 7.5 m.y. (since the onset of deformation). These estimates argue against regional thermal conduction as the only mechanism for post-depositional heating and support seafloor heat flow and shipboard geochemical evidence for local convective heat transfer in the vicinity of Site 718. In terms of source-area implications, dated samples have mean apatite fission-track ages that are only 0 to 10 m.y. older than depositional ages. These young ages imply rapid transport of sediment to the distal Bengal Fan and source areas characterized by high denundation rates (〈300 m/m.y.). These rates suggest that source areas similar to parts of the present-day Himalayas supplied sediment to the distal Bengal Fan since at least 17 Ma.
    Keywords: 116-717; 116-717B; 116-717C; 116-718; 116-718C; 116-718E; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg116; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 4
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    PANGAEA
    In:  Supplement to: Rea, David K; Lohmann, Kyger C; MacLeod, Norman D; House, Martha A; Hovan, Steven A; Martin, Gale D (1991): Oxygen and carbon isotopic records from the oozes of Sites 752, 754, 756, and 757, eastern Indian Ocean. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 229-240, https://doi.org/10.2973/odp.proc.sr.121.130.1991
    Publication Date: 2024-01-09
    Description: Oxygen and carbon isotopic records have been developed for the Cenozoic carbonate oozes of Sites 752, 754, 756, and 757 based on the analysis of monospecific benthic foraminifers. The intent of this report is to provide a basic isotopic stratigraphy for use in other paleoceanographic studies. The oxygen isotope record displays the enrichments associated with cooling or ice volume buildup at the Eocene/Oligocene boundary, in the middle Miocene, and in the upper Pliocene. The carbon isotopic record contains the Chron 16 enrichment in the lower Miocene and the Chron 6 depletion in the uppermost Miocene.
    Keywords: 121-752A; 121-754A; 121-756B; 121-756C; 121-757B; DRILL; Drilling/drill rig; Joides Resolution; Leg121; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 5
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    Unknown
    PANGAEA
    In:  Supplement to: Proust, D; Meunier, A; Fouillac, A M; Dudoignon, P; Sturz, Anne Aleda; Charvet, Jacques; Scott, Steven D (1992): Preliminary results on the mineralogy and geochemistry of basalt alteration, Hole 794D. In: Tamaki, K; Suychiro, K; Allan, J; McWilliams, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 127/128(2), 883-889, https://doi.org/10.2973/odp.proc.sr.127128-2.205.1992
    Publication Date: 2024-01-09
    Description: The basaltic rocks of Hole 794D drilled during Leg 128 are strongly altered. Microprobe analyses and XRD spectra on small quantities of matter extracted from thin sections show that primary minerals and glassy zones of the groundmass are totally or partially replaced by clay minerals with chlorite/saponite mixed-layer composition whatever the rock sample considered. This mixed-layer was also identified in veins and vesicles where it crystallizes in spheroidal aggregates. The largest veins and vesicles are filled by a zoned deposit: the chlorite/saponite mixed-layer always occupies the central part and is rimmed by pure saponite. Calcite crystallizes in secondary fractures which crosscut the clayey veins and vesicles. Chemographic analysis based on the M+-4Si-3R2+ projection shows that the chemical composition of the saponite component in the mixed-layer is identical to that of the free saponite. This indicates that the clay mineral crystallization was controlled by the chemical composition of the alteration fluids. From petrographic evidence, it is suggested that both chlorite/saponite mixed-layer and free saponite belong to the same hydrothermal event and are produced by a temperature decrease. This is supported by the stable isotopic data. The isotopic data show very little variation: d18O saponite ranges from 13.1 per mil to 13.5 per mil, and dD saponite from -73.6 per mil to -70.0 per mil. d18O calcite varies from +19.7 per mil to +21.9 per mil vs SMOW and d13C from -3.2 per mil to +0.4 per mil vs. PDB. These values are consistent with seawater alteration of the basalt. The formation of saponite took place at 150°-180°C and the formation of calcite at about 65°C.
    Keywords: 128-794D; Description; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Japan Sea; Joides Resolution; Leg128; Mass spectrometer Finnigan Delta-E; Ocean Drilling Program; ODP; Sample code/label; δ13C; δ18O; δ Deuterium
    Type: Dataset
    Format: text/tab-separated-values, 26 data points
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  • 6
    Publication Date: 2024-01-09
    Keywords: 120-747A; Age model; Age model, optional; Age model, paleomag, Berggren et al (1985); Age model, paleomag, Cande and Kent (1992); Ageprofile Datum Description; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Joides Resolution; Leg120; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: text/tab-separated-values, 66 data points
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  • 7
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    PANGAEA
    In:  Supplement to: Herbert, Timothy D; d'Hondt, Steven L (1990): Precessional climate cyclicity in Late Cretaceous-Early Tertiary marine sediments: a high resolution chronometer of Cretaceous-Tertiary boundary events. Earth and Planetary Science Letters, 99(3), 263-275, https://doi.org/10.1016/0012-821X(90)90115-E
    Publication Date: 2024-01-06
    Description: We report well-dated Late Cretaceous and Early Tertiary precessional climatic cycles, recorded by rhythmic carbonate maxima and minima in South Atlantic deep sea sites. Spectral analyses of digitized sediment color, a suitable carbonate proxy, show prominent regularities in the spacing marl-carbonate beds. Magnetostratigraphic dating over a number of magnetic chrons constrains the duration of the cycles, which can be detected over at least 20 Myr of sedimentation at 7 coring locations. Their mean absolute period of 23.5 +/- 4.4kyr agrees closely with the predicted late Cretaceous precessional period of 20.8 kyr. Because they can be matched to a physical forcing mechanism with a known repeat time, the cycles offer a new high-resolution tool to measure rates of climate change before and after the Cretaceous-Tertiary (K/T) boundary. From counts of carbonate cycles, we derive the position of the K/T boundary within C29R at 350 kyr after the base of the reversal. The constancy of cycle thickness (linearly related to sedimentation rate) and amplitude up to the “boundary clay” does not give evidence for climate instability preceding the boundary. Orbital chronometry records a step-function decrease in sediment accumulation rate at the Cretaceous-Tertiary boundary that is consistent with a geologically instantaneous event.
    Keywords: 39-356; 39-357; 72-516F; 74-525A; 74-527; 74-528; 74-529; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg39; Leg72; Leg74; South Atlantic; South Atlantic/CONT RISE; South Atlantic/CREST; South Atlantic/PLATEAU; South Atlantic/RIDGE; South Atlantic/SLOPE
    Type: Dataset
    Format: application/zip, 7 datasets
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  • 8
    Publication Date: 2024-01-06
    Keywords: 39-356; AGE; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Duration; Glomar Challenger; Leg39; Sample code/label; Sample code/label 2; South Atlantic/PLATEAU; Spacing
    Type: Dataset
    Format: text/tab-separated-values, 12 data points
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  • 9
    Publication Date: 2024-01-06
    Keywords: 72-516F; AGE; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Duration; Glomar Challenger; Leg72; Sample code/label; Sample code/label 2; South Atlantic/CONT RISE; Spacing
    Type: Dataset
    Format: text/tab-separated-values, 77 data points
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  • 10
    Publication Date: 2024-01-06
    Keywords: 39-357; AGE; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Duration; Glomar Challenger; Leg39; Sample code/label; South Atlantic/CONT RISE; Spacing
    Type: Dataset
    Format: text/tab-separated-values, 23 data points
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