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Datasets of project "Ocean Drilling Program"

Mostrando recursos 1 - 20 de 39.366

  1. Authigenic uranium, mass accumulation rates, benthic d13C and SST reconstruction for ODP Site 177-1094

    Hayes, Christoper T; Martinez-Garcia, Alfredo; Hasenfratz, Albin; Jaccard, Samuel L; Hodell, David A; Sigman, Daniel M; Haug, Gerald H; Anderson, Robert F

  2. Authigenic uranium, mass accumulation rates, benthic d13C and SST during the last interglacial period of ODP Site 177-1094

    Hayes, Christoper T; Martinez-Garcia, Alfredo; Hasenfratz, Albin; Jaccard, Samuel L; Hodell, David A; Sigman, Daniel M; Haug, Gerald H; Anderson, Robert F
    Southern Ocean sediments reveal a spike in authigenic uranium 127,000 years ago, within the last interglacial, reflecting decreased oxygenation of deep water by Antarctic Bottom Water (AABW). Unlike ice age reductions in AABW, the interglacial stagnation event appears decoupled from open ocean conditions and may have resulted from coastal freshening due to mass loss from the Antarctic ice sheet. AABW reduction coincided with increased North Atlantic Deep Water (NADW) formation, and the subsequent reinvigoration in AABW coincided with reduced NADW formation. Thus, alternation of deep water formation between the Antarctic and the North Atlantic, believed to characterize ice ages, apparently...

  3. Age model for the period spanning 140-118 ka of ODP Site 177-1094

    Hayes, Christoper T; Martinez-Garcia, Alfredo; Hasenfratz, Albin; Jaccard, Samuel L; Hodell, David A; Sigman, Daniel M; Haug, Gerald H; Anderson, Robert F

  4. Age determination of sediments and biomarkers of ODP Hole 169-1034C

    Smittenberg, Rienk H; Hopmans, Ellen C; Schouten, Stefan; Hayes, John M; Eglinton, Timothy I; Sinninghe Damsté, Jaap S
    The radiocarbon contents of various biomarkers extracted from the varve-counted sediments of Saanich Inlet, Canada, were determined to assess their applicability for dating purposes. Calibrated ages obtained from the marine planktonic archaeal biomarker crenarchaeol compared favorably with varve-count ages. The same conclusion could be drawn for a more general archaeal biomarker (GDGT-0), although this biomarker proved to be less reliable due to its less-specific origin. The results also lend support to earlier indications that marine crenarchaeota use dissolved inorganic carbon (DIC) as their carbon source. The average reservoir age offset DR of 430 years, determined using the crenarchaeol radiocarbon ages,...

  5. (Table 4a) Calibrated age ranges obtained with the atmospheric calibration curve, of sedimentary total organic carbon, terrestrial macrofossils, and isolated biomarkers originating from differently aged sediment layers, ODP Hole 169-1034C

    Smittenberg, Rienk H; Hopmans, Ellen C; Schouten, Stefan; Hayes, John M; Eglinton, Timothy I; Sinninghe Damsté, Jaap S

  6. (Table 5) Reservoir ages in 14C years BP and reservoir age offsets DR for ODP Hole 169-1034C samples

    Smittenberg, Rienk H; Hopmans, Ellen C; Schouten, Stefan; Hayes, John M; Eglinton, Timothy I; Sinninghe Damsté, Jaap S

  7. (Table 4b) Calibrated age ranges obtained with the marine calibration curve, of sedimentary total organic carbon, terrestrial macrofossils, and isolated biomarkers originating from differently aged sediment layers, ODP Hole 169-1034C

    Smittenberg, Rienk H; Hopmans, Ellen C; Schouten, Stefan; Hayes, John M; Eglinton, Timothy I; Sinninghe Damsté, Jaap S

  8. (Table 3) Radiocarbon contents and d13C values of DIC presented at the ODP Hole 169-1034C position

    Smittenberg, Rienk H; Hopmans, Ellen C; Schouten, Stefan; Hayes, John M; Eglinton, Timothy I; Sinninghe Damsté, Jaap S

  9. (Table 2) Amounts, stable and radiocarbon isotopic compositions of sedimentary total organic carbon, terrestrial macrofossils, and isolated biomarkers originating from differently aged sediment layers, ODP Hole 169-1034C

    Smittenberg, Rienk H; Hopmans, Ellen C; Schouten, Stefan; Hayes, John M; Eglinton, Timothy I; Sinninghe Damsté, Jaap S

  10. (Table 3) Initial radiocarbon contents and conventional radiocarbon ages of sedimentary total organic carbon, terrestrial macrofossils, and isolated biomarkers originating from differently aged sediment layers, ODP Hole 169-1034C

    Smittenberg, Rienk H; Hopmans, Ellen C; Schouten, Stefan; Hayes, John M; Eglinton, Timothy I; Sinninghe Damsté, Jaap S

  11. (Table 1) Origin and age of the sediment subsamples of ODP Hole 169-1034C

    Smittenberg, Rienk H; Hopmans, Ellen C; Schouten, Stefan; Hayes, John M; Eglinton, Timothy I; Sinninghe Damsté, Jaap S

  12. Calcite accumulation in the eastern equatorial Pacific

    Loubere, Paul; Mekik, Figen; Francois, Roger; Pichat, Sylvain
    The eastern equatorial Pacific (EEP) is an important center of biological productivity, generating significant organic carbon and calcite fluxes to the deep ocean. We reconstructed paleocalcite flux for the past 30,000 years in four cores collected beneath the equatorial upwelling and the South Equatorial Current (SEC) by measuring ex230Th-normalized calcite accumulation rates corrected for dissolution with a newly developed proxy for "fraction of calcite preserved". This method produced very similar results at the four sites and revealed that the export flux of calcite was 30-50% lower during the LGM compared to the Holocene. The internal consistency of these results supports...

  13. (Table 2) Calcite accumulation rates in the eastern equatorial Pacific

    Loubere, Paul; Mekik, Figen; Francois, Roger; Pichat, Sylvain

  14. (Table 3) Th230 excess content and calcite accumulation rates in the eastern equatorial Pacific

    Loubere, Paul; Mekik, Figen; Francois, Roger; Pichat, Sylvain

  15. (Table 2) Replicate nitrogen isotope analyses of twelve aliquots of bulk freeze-dried sediment taken from ODP Hole 117-724C

    Higginson, Matthew J; Altabet, Mark A

  16. (Table 1) Previously published, corrected postpublication and new measurements of Nitrogen abundance and stable isotope ratios in ODP Hole 117-724C

    Higginson, Matthew J; Altabet, Mark A

  17. Comparison of nitrogen isotopic values from different preparation methods

    Higginson, Matthew J; Altabet, Mark A
    We are writing to comment on the work of Tamburini et al. (2003, doi:10.1029/2000PA000616). During the course of subsequent discussions between the authors and ourselves, it has become clear that the published sedimentary nitrogen isotopic values for Ocean Drilling Program (ODP) Site 724 are in error. Our reanalysis of sediment samples from the same intervals has revealed a significant offset from the original d15N data, requiring a revised assessment of their initial interpretation. The purposes of this comment are to (1) address the origin of these errors; (2) outline a protocol for future validation of nitrogen isotopic analyses; and (3)...

  18. Mg/Ca ratios in planktonic foraminifera

    Klinkhammer, Gary P; Haley, Brian A; Mix, Alan C; Benway, Heather M; Cheseby, Maziet
    The primary Mg/Ca ratio of foraminiferal shells is a potentially valuable paleoproxy for sea surface temperature (SST) reconstructions. However, the reliable extraction of this ratio from sedimentary calcite assumes that we can overcome artifacts related to foraminiferal ecology and partial dissolution, as well as contamination by secondary calcite and clay. The standard batch method for Mg/Ca analysis involves cracking, sonicating, and rinsing the tests to remove clay, followed by chemical cleaning, and finally acid-digestion and single-point measurement. This laborious procedure often results in substantial loss of sample (typically 30-60%). We find that even the earliest steps of this procedure can...

  19. (Table 1) Reproducibility of flow-through ratios of Mg/Ca and Sr/Ca in untreated samples of Ontong Java Plateau

    Klinkhammer, Gary P; Haley, Brian A; Mix, Alan C; Benway, Heather M; Cheseby, Maziet

  20. Morphometric data for Globigerinoides sacculifer and Globorotalia tumida (size and Fourier coefficients) and temperature proxy reconstructions (UK37' and Tex86H) from samples from ODP sites 165-999/165-1000 and 202-1241 spanning the last 10Ma

    Schmidt, Daniela N; Caromel, Aude G M; Seki, Osamu; Rae, James William B; Renaud, Sabrina
    Sediment samples from both Site 165-999/165-1000 (Atlantic) and Site 202-1241 (Pacific) were chosen at 1Ma intervals over the period 0.3-9.3Ma. Samples were washed and sieved <150µm. Splits of the sediment fraction were picked completely to obtain, where possible, at least 30 specimens each of planktic foraminifer species Globigerinoides sacculifer and Globorotalia tumida, on which outline analysis (Fourier) was performed. Sea surface and thermocline temperatures were reconstructed from palaeoenvironmental proxies (UK37' and Tex86H respectively).

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