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Datasets of project "Deep Sea Drilling Project"

Mostrando recursos 1 - 20 de 18.953

  1. Stable isotope record of Maestrichtian foraminifera

    Frank, Tracy D; Arthur, Michael A
    A global compilation of deep-sea isotopic records suggests that Maastrichtian ocean-climate evolution was technically driven. During the early Maastrichtian the Atlantic intermediate-deep ocean was isolated from the Pacific, Indian, and Southern Oceans; deep water formed in the high-latitude North Atlantic and North Pacific. At the early/late Maastrichtian boundary a major reorganization of oceanic circulation patterns occurred, resulting in the development of a thermohaline circulation system similar to that of the modern oceans. A combination of isotopic and plate kinematic data suggests that this event was triggered by the final breaching of tectonic sills in the South Atlantic and the initiation...

  2. Stable isotope ratios of Maestrichtian foraminifera of DSDP Hole 80-548

    Frank, Tracy D; Arthur, Michael A

  3. Stable isotope ratios of Maestrichtian foraminifera of DSDP Hole 44-390

    Frank, Tracy D; Arthur, Michael A

  4. Stable isotope ratios of Maestrichtian foraminifera of DSDP Hole 39-357

    Frank, Tracy D; Arthur, Michael A

  5. Stable isotope ratios of Maestrichtian foraminifera of DSDP Hole 39-357

    Frank, Tracy D; Arthur, Michael A

  6. Sable isotope record and sediment composition of Cretaceous samples of Deremara Rise

    Bice, Karen L; Birgel, Daniel; Meyers, Philip A; Dahl, Kristina A; Hinrichs, Kai-Uwe; Norris, Richard D
    We estimate tropical Atlantic upper ocean temperatures using oxygen isotope and Mg/Ca ratios in well-preserved planktonic foraminifera extracted from Albian through Santonian black shales recovered during Ocean Drilling Program Leg 207 (North Atlantic Demerara Rise). On the basis of a range of plausible assumptions regarding seawater composition at the time the data support temperatures between 33° and 42°C. In our low-resolution data set spanning ~84-100 Ma a local temperature maximum occurs in the late Turonian, and a possible minimum occurs in the mid to early late Cenomanian. The relation between single species foraminiferal d18O and Mg/Ca suggests that the ratio...

  7. (Table 2) Paleolatitude and reconstructed temperatures for Cretaceous samples of Demerara Rise

    Bice, Karen L; Birgel, Daniel; Meyers, Philip A; Dahl, Kristina A; Hinrichs, Kai-Uwe; Norris, Richard D

  8. (Table 1) Average stable isotope and Mg/Ca values for single species Cretaceous samples of Demerara Rise

    Bice, Karen L; Birgel, Daniel; Meyers, Philip A; Dahl, Kristina A; Hinrichs, Kai-Uwe; Norris, Richard D

  9. Chronology and petrology in MIS4-2 of DSDP Site 94-609

    Obrochta, Stephen P; Miyahara, Hiroko; Yokoyama, Yusuke; Crowley, Thomas J
    Ice-rafting evidence for a '1500-year cycle' sparked considerable debate on millennial-scale climate change and the role of solar variability. Here, we reinterpret the last 70,000 years of the subpolar North Atlantic record, focusing on classic DSDP Site 609, in the context of newly available raw data, the latest radiocarbon calibration (Marine09) and ice core chronology (GICC05), and a wider range of statistical methodologies. A ~1500-year oscillation is primarily limited to the short glacial Stage 4, the age of which is derived solely from an ice flow model (ss09sea), subject to uncertainty, and offset most from the original chronology. Results from...

  10. (Table 3) Revised age model of DSDP Site 94-609

    Obrochta, Stephen P; Miyahara, Hiroko; Yokoyama, Yusuke; Crowley, Thomas J

  11. (Table 2) Tie points of DSDP Site 94-609 and Greenland ice cores

    Obrochta, Stephen P; Miyahara, Hiroko; Yokoyama, Yusuke; Crowley, Thomas J; Bond, Gerard C

  12. (Table 1) DSDP Site 94-609 radiocarbon dates

    Obrochta, Stephen P; Miyahara, Hiroko; Yokoyama, Yusuke; Crowley, Thomas J; Bond, Gerard C

  13. (Table S3) Abundance of Neogloboquadrina pachyderma (s) in MIS4-2 of DSDP Site 94-609

    Bond, Gerard C; Heinrich, Hartmut; Broecker, Wallace S; Labeyrie, Laurent D; McManus, Jerry F; Andrews, John T; Huon, Sylvain; Jantschik, Ruediger; Clasen, Silke; Simet, Christine; Tedesco, Kathy; Klas, Mieczyslawa; Bonani, Georges; Ivy, Susan; Obrochta, Stephen P

  14. (Table S4) Stable carbon and oxygen isotope ratios of Neogloboquadrina pachyderma (s) in MIS4-2 of DSDP Site 94-609

    Obrochta, Stephen P; Miyahara, Hiroko; Yokoyama, Yusuke; Crowley, Thomas J; Bond, Gerard C

  15. (Table S2) Lithic grains in MIS4-2 of DSDP Site 94-609, large fraction

    Bond, Gerard C; Heinrich, Hartmut; Broecker, Wallace S; Labeyrie, Laurent D; McManus, Jerry F; Andrews, John T; Huon, Sylvain; Jantschik, Ruediger; Clasen, Silke; Simet, Christine; Tedesco, Kathy; Klas, Mieczyslawa; Bonani, Georges; Ivy, Susan; Obrochta, Stephen P

  16. Age model of IODP Site 303-U1308

    Obrochta, Stephen P; Crowley, Thomas J; Channell, James E T; Hodell, David A; Baker, Paul A; Seki, Arisa; Yokoyama, Yusuke

  17. Stratigraphic correlation of IODP Site 303-U1308

    Obrochta, Stephen P; Crowley, Thomas J; Channell, James E T; Hodell, David A; Baker, Paul A; Seki, Arisa; Yokoyama, Yusuke

  18. Ichthyolith accumulation and age models from DSDP 527, DSDP 596, ODP 886, ODP 1209, and Gubbio

    Sibert, Elizabeth C; Hull, Pincelli M; Norris, Richard D
    Open ocean ecosystems experienced profound disruption in biodiversity and structure during the Cretaceous-Paleogene (K-Pg) mass extinction ~66 million years ago. Extinction scenarios have suggested that a collapse of phytoplankton production rippled up the food chain causing wholesale loss of consumers and top predators. Pelagic fishes represent a key trophic link between primary producers and top predators and provide a means to examine the influence of trophic relationships during extinctions. Here we show that there is geographic heterogeneity in the abundance of fishes through the mass extinction using the accumulation rate of ichthyoliths (i.e., microscopic fish teeth and shark dermal scales)....

  19. Ichthyolith counts and MAR at DSDP Hole 91-596

    Sibert, Elizabeth C; Hull, Pincelli M; Norris, Richard D

  20. Ichthyolith counts and MAR at DSDP Hole 74-527

    Sibert, Elizabeth C; Hull, Pincelli M; Norris, Richard D

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