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  • 1990-1994  (22)
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  • 1
    Electronic Resource
    Electronic Resource
    Molecules record sea change (1992)
    [s.l.] : Nature Publishing Group
    Nature 356 (1992), S. 385-386 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] LONG-CHAIN (Q^-Q^) alkenones are organic molecular fossils from a class of phytoplankton which can be used to create a record of sea surface temperature from marine sediment deposits. Eglinton et al. on page 423 of this issue1 have used this technique to produce a 650,000-year record ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/356385a0
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Geochemistry of ODP Leg 117 sites (1991)
    PANGAEA
    In:  Supplement to: Jarrard, Richard D; Lyle, Mitchell W (1991): High-resolution geochemical variations at Sites 723, 728, and 731: a comparison of x-ray fluorescence and geochemical logs. In: Prell, WL; Niitsuma, N; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 117, 473-498, https://doi.org/10.2973/odp.proc.sr.117.174.1991
    Details
    Publication Date: 2024-01-09
    Description: Geochemical logging is a routine part of the Ocean Drilling Program, yet the reliability of ODP geochemical logs has rarely been evaluated quantitatively. On ODP Leg 117, geochemical logs were obtained at Sites 723, 728, and 731. We report here an evaluation of ODP geochemical log quality based on high-resolution sampling and X-ray fluorescence measurement of 398 core samples from the three sites. At these sites we lacked the complete suite of high-quality logs needed for accurate log-based estimation of elemental percentages; only calcium and silicon logs had magnitudes similar to those from XRF. However, relative variations of log-based elemental abundances could be determined. Our comparisons of the XRF analyses with the character of variations in geochemical logs indicates that the reliability of ODP geochemical logs varies substantially, within short intervals and particularly between sites. In general, the geochemical logs are capable of detecting changes in formation geochemistry that are larger than the following thresholds: 2% for Ca, 2%-6% for Si, 0.5%-1% for K, 0.1% for Ti, 0.5% for Fe, and 0.4% for Al. All sulfur variations observed in the XRF data, as well as many of the iron variations, were below the resolving power of the geochemical logging tools. These precisions are generally similar to those determined at the Conoco test well by Chapman et al. (1987), in spite of the very different ODP logging conditions.
    Keywords: 117-723B; 117-728B; 117-731A; 117-731B; 117-731C; Arabian Sea; DRILL; Drilling/drill rig; Joides Resolution; Leg117; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    (Appendix) Calcium carbonate content in OD Hole 130-806B (1993)
    PANGAEA
    In:  Supplement to: Pratson, Elizabeth Lewis; Lyle, Mitchell W; Tivy, Jennifer (1993): Data report: Geochemical well logs through Cenozoic sediments from Sites 805 and 806. In: Berger, WH; Kroenke, LW; Mayer, LA; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 130, 775-788, https://doi.org/10.2973/odp.proc.sr.130.056.1993
    Details
    Publication Date: 2024-01-09
    Description: Geochemical well logs were obtained in sediment at Sites 805 and 806 of Ocean Drilling Program Leg 130. Corrections have been applied to the logs to account for variations in bore-hole size, drilling-fluid composition, and drill-pipe attenuation. Oxide and calcium carbonate weight percentages were calculated from the logs and are compared with available carbonate measurements from core. Log-derived CaCO3 values from Hole 805C, though lower than shipboard CaCO3 core measurements, show a similar variation in character. In Hole 806B, log and shipboard CaCO3 sample values have a similar mean and variance. The CaCO3 high-resolution sample values from Hole 806B, however, have a similar mean but a lower variance than the CaCO3 logs. It is probable that discrepancies result from gamma-ray spectrometry tool malfunctions experienced throughout the logging operations of this leg as well as from chlorine-induced interference in the calcium yield. Because the amplitude of CaCO3 variations was extremely low (standard deviation of 1.38 on high-resolution samples), the tool, which has a sensitivity of roughly 2% for Ca, probably would not have been able to detect these variations, even if the tool had been working properly.
    Keywords: 130-806B; Calcium carbonate; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg130; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 578 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    (Table 3) Geochemistry of ODP Site 117-731 (1991)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 117-731A; 117-731B; 117-731C; Aluminium; Arabian Sea; Barium; Calcium; Chromium; Cobalt; Copper; Depth, composite; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Intercore correlation; Iron; Joides Resolution; Lanthanum; Lead; Leg117; Magnesium; Manganese; Nickel; Ocean Drilling Program; ODP; Phosphorus; Potassium; Rubidium; Salt content; Sample code/label; Silicon; Sodium; Strontium; Sulfur, total; Thorium; Titanium; Uranium; X-ray fluorescence (XRF); Zinc
    Type: Dataset
    Format: text/tab-separated-values, 2820 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    (Table 2) Geochemistry of ODP Hole 117-728B (1991)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 117-728B; Aluminium; Arabian Sea; Barium; Calcium; Chromium; Cobalt; Copper; Depth, composite; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Intercore correlation; Iron; Joides Resolution; Lanthanum; Lead; Leg117; Magnesium; Manganese; Nickel; Ocean Drilling Program; ODP; Phosphorus; Potassium; Rubidium; Salt content; Sample code/label; Silicon; Sodium; Strontium; Sulfur, total; Thorium; Titanium; Uranium; X-ray fluorescence (XRF); Zinc
    Type: Dataset
    Format: text/tab-separated-values, 3629 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    (Table 1) Geochemistry of ODP Hole 117-723B (1991)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 117-723B; Aluminium; Arabian Sea; Barium; Calcium; Chromium; Cobalt; Copper; Depth, composite; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Intercore correlation; Iron; Joides Resolution; Lanthanum; Lead; Leg117; Magnesium; Manganese; Nickel; Ocean Drilling Program; ODP; Phosphorus; Potassium; Rubidium; Salt content; Sample code/label; Silicon; Sodium; Strontium; Sulfur, total; Thorium; Titanium; Uranium; X-ray fluorescence (XRF); Zinc
    Type: Dataset
    Format: text/tab-separated-values, 3846 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Age-depth correlations for Ontong Java Plateau sites (1993)
    PANGAEA
    In:  Supplement to: Lyle, Mitchell W; Wilkens, Roy H; Mayer, Larry A (1993): Detailed stratigraphic correlation of the Neogene sedimentary sequences on the Ontong Java Plateau by well logging: ODP Sites 803, 805, 806, 807, and DSDP Site 586. In: Berger, WH; Kroenke, LW; Mayer, LA; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 130, 587-606, https://doi.org/10.2973/odp.proc.sr.130.043.1993
    Details
    Publication Date: 2024-04-11
    Description: We used well logs, in some cases combined with shipboard physical properties measurements to make more complete profiles and to correlate between sites on the Ontong Java Plateau. By comparing sediment bulk density, velocity, and resistivity logs from adjacent holes at the same site, we showed that even subtle features of the well logs are reproducible and are caused by variations in sedimentation. With only minor amounts of biostratigraphic information, we could readily correlate these sedimentary features across the entire top of the Ontong Java Plateau, demonstrating that for most of the Neogene the top of the plateau is a single sedimentary province. We found it more difficult, but still possible, to correlate in detail sites from the top of the plateau to those drilled on the flanks. The pattern of sedimentation rate variation down the flank of the plateau cannot be interpreted as simply controlled by dissolution. Site 805, in particular, oscillates between accumulating sediment at roughly the same rate as cores on top of the Ontong Java Plateau, and accumulating sediment as slowly as Site 803, 200 m deeper in the water column. These oscillations do not match earlier reconstructions of central Pacific carbonate compensation depth variations.
    Keywords: 130-803D; 130-805C; 130-806B; 130-807A; 130-807C; 89-586C; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Joides Resolution; Leg130; Leg89; North Pacific Ocean; Ocean Drilling Program; ODP; South Pacific; West equatorial Pacific Ocean
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    (Table 1) Age-depth correlations for ODP Leg 130 sites and DSDP Hole 89-586C (1993)
    PANGAEA
    Details
    Publication Date: 2024-04-11
    Keywords: 130-803D; 130-805C; 130-806B; 130-807A; 89-586C; Age model; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; Event label; Glomar Challenger; Joides Resolution; Leg130; Leg89; North Pacific Ocean; Ocean Drilling Program; ODP; South Pacific; West equatorial Pacific Ocean
    Type: Dataset
    Format: text/tab-separated-values, 2713 data points
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    DATA PANGAEA
  • 9
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    (Table 2) Age-depth correlations for ODP Leg 130 sites (1993)
    PANGAEA
    Details
    Publication Date: 2024-04-11
    Keywords: 130-803D; 130-806B; 130-807A; 130-807C; Age model; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; Joides Resolution; Leg130; North Pacific Ocean; Ocean Drilling Program; ODP; West equatorial Pacific Ocean
    Type: Dataset
    Format: text/tab-separated-values, 2642 data points
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    DATA PANGAEA
  • 10
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    (Table 3) Stable isotope ratios measured on Uvigerina sp. from sediment core W8709A-8TC (1992)
    PANGAEA
    Details
    Publication Date: 2024-05-02
    Keywords: DEPTH, sediment/rock; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Mass spectrometer Finnigan MAT 251; TC; Trigger corer; Uvigerina sp., δ13C; Uvigerina sp., δ18O; W8709A; W8709A-8TC; Wecoma
    Type: Dataset
    Format: text/tab-separated-values, 17 data points
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    DATA PANGAEA
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