Oxygen and carbon isotopes from foraminifers and benthic foraminiferal abundance at DSDP Holes 71-511 and 71-512, supplement to: Muza, Jay Phillip; Williams, Douglas F; Wise, Sherwood W (1983): Paleogene oxygen record for Deep Sea Drilling Project Sites 511 and 512, subantarctic South Atlantic Ocean: Paleotemperatures, paleoceanographic changes, and the Eocene/Oligocene boundary event. In: Ludwig, WJ; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 71, 409-422
An Eocene-Oligocene oxygen and carbon isotope history based on planktonic and benthic foraminifers from Deep Sea Drilling Project Leg 71 cores has been constructed for the Maurice Ewing Bank of the eastern Falkland Plateau, Southwest Atlantic Ocean. Specifically, the cores cover portions of the midd...
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Format: | Article in Journal/Newspaper |
Language: | English |
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PANGAEA - Data Publisher for Earth & Environmental Science
1983
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Online Access: | https://dx.doi.org/10.1594/pangaea.815065 https://doi.pangaea.de/10.1594/PANGAEA.815065 |
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ftdatacite:10.1594/pangaea.815065 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Drilling/drill rig Leg71 Glomar Challenger Deep Sea Drilling Project DSDP |
spellingShingle |
Drilling/drill rig Leg71 Glomar Challenger Deep Sea Drilling Project DSDP Muza, Jay Phillip Williams, Douglas F Wise, Sherwood W Oxygen and carbon isotopes from foraminifers and benthic foraminiferal abundance at DSDP Holes 71-511 and 71-512, supplement to: Muza, Jay Phillip; Williams, Douglas F; Wise, Sherwood W (1983): Paleogene oxygen record for Deep Sea Drilling Project Sites 511 and 512, subantarctic South Atlantic Ocean: Paleotemperatures, paleoceanographic changes, and the Eocene/Oligocene boundary event. In: Ludwig, WJ; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 71, 409-422 |
topic_facet |
Drilling/drill rig Leg71 Glomar Challenger Deep Sea Drilling Project DSDP |
description |
An Eocene-Oligocene oxygen and carbon isotope history based on planktonic and benthic foraminifers from Deep Sea Drilling Project Leg 71 cores has been constructed for the Maurice Ewing Bank of the eastern Falkland Plateau, Southwest Atlantic Ocean. Specifically, the cores cover portions of the middle Eocene, upper Eocene, and lower Oligocene. Surface water isotopic temperatures postulated for the middle Eocene at Site 512 fluctuated within about four degrees but generally averaged about 9°C. Bottom isotopic temperatures at Site 512 (water depth, 1846 m) were generally a degree lower than surface water temperatures. Surface water isotopic temperatures at Site 511 initially averaged about 11°C during the late Eocene, but dropped to an average of 7°C in the early Oligocene. Bottom isotopic temperatures at Site 511 (water depth, 2589 m) generally record temperatures between 12.5°C and 8°C, similar to the range in the surface water isotopic temperatures. During the early Oligocene, bottom isotopic temperatures dropped sharply and averaged about 2°C (very close to present-day values). Surface water temperature values also decreased to an average of about 7°C, therefore leading to a significant divergence between surface and bottom water isotopic temperatures during the early Oligocene. Comparisons among Southern Ocean DSDP Sites 511, 512, and 277, and between these and other DSDP sites from central and northern latitudes (Sites 44, 167, 171, 292, 357, 398, 119, and 401) show that much of the Eocene was characterized by relatively warm temperatures until sometime in either the middle Eocene, late Eocene, or early Oligocene. At each site, conspicuous 18O enrichments occur in both the benthic and planktonic foraminifers over a relatively short period of time. Although a general trend toward a climatic deterioration is evident, the density of data points among the various studies is still too sparse to determine either synchrony or time-transgression between the major isotopic events. A close correlation could be made between the Site 511 oxygen isotope temperature curve and paleoclimatic trends derived independently from radiolarian studies. The sharp temperature drop and the divergence between bottom and surface water temperatures during the early Oligocene apparently reflect a major expansion of the antarctic water mass. The migration of the boundary between the subantarctic and antarctic water masses over the site at this time would account in part for the sharp temperature changes. Sharp changes of this nature would not necessarily be noted in other geographic areas, particularly those to the north which have different oceanographic regimes. |
format |
Article in Journal/Newspaper |
author |
Muza, Jay Phillip Williams, Douglas F Wise, Sherwood W |
author_facet |
Muza, Jay Phillip Williams, Douglas F Wise, Sherwood W |
author_sort |
Muza, Jay Phillip |
title |
Oxygen and carbon isotopes from foraminifers and benthic foraminiferal abundance at DSDP Holes 71-511 and 71-512, supplement to: Muza, Jay Phillip; Williams, Douglas F; Wise, Sherwood W (1983): Paleogene oxygen record for Deep Sea Drilling Project Sites 511 and 512, subantarctic South Atlantic Ocean: Paleotemperatures, paleoceanographic changes, and the Eocene/Oligocene boundary event. In: Ludwig, WJ; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 71, 409-422 |
title_short |
Oxygen and carbon isotopes from foraminifers and benthic foraminiferal abundance at DSDP Holes 71-511 and 71-512, supplement to: Muza, Jay Phillip; Williams, Douglas F; Wise, Sherwood W (1983): Paleogene oxygen record for Deep Sea Drilling Project Sites 511 and 512, subantarctic South Atlantic Ocean: Paleotemperatures, paleoceanographic changes, and the Eocene/Oligocene boundary event. In: Ludwig, WJ; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 71, 409-422 |
title_full |
Oxygen and carbon isotopes from foraminifers and benthic foraminiferal abundance at DSDP Holes 71-511 and 71-512, supplement to: Muza, Jay Phillip; Williams, Douglas F; Wise, Sherwood W (1983): Paleogene oxygen record for Deep Sea Drilling Project Sites 511 and 512, subantarctic South Atlantic Ocean: Paleotemperatures, paleoceanographic changes, and the Eocene/Oligocene boundary event. In: Ludwig, WJ; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 71, 409-422 |
title_fullStr |
Oxygen and carbon isotopes from foraminifers and benthic foraminiferal abundance at DSDP Holes 71-511 and 71-512, supplement to: Muza, Jay Phillip; Williams, Douglas F; Wise, Sherwood W (1983): Paleogene oxygen record for Deep Sea Drilling Project Sites 511 and 512, subantarctic South Atlantic Ocean: Paleotemperatures, paleoceanographic changes, and the Eocene/Oligocene boundary event. In: Ludwig, WJ; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 71, 409-422 |
title_full_unstemmed |
Oxygen and carbon isotopes from foraminifers and benthic foraminiferal abundance at DSDP Holes 71-511 and 71-512, supplement to: Muza, Jay Phillip; Williams, Douglas F; Wise, Sherwood W (1983): Paleogene oxygen record for Deep Sea Drilling Project Sites 511 and 512, subantarctic South Atlantic Ocean: Paleotemperatures, paleoceanographic changes, and the Eocene/Oligocene boundary event. In: Ludwig, WJ; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 71, 409-422 |
title_sort |
oxygen and carbon isotopes from foraminifers and benthic foraminiferal abundance at dsdp holes 71-511 and 71-512, supplement to: muza, jay phillip; williams, douglas f; wise, sherwood w (1983): paleogene oxygen record for deep sea drilling project sites 511 and 512, subantarctic south atlantic ocean: paleotemperatures, paleoceanographic changes, and the eocene/oligocene boundary event. in: ludwig, wj; krasheninnikov, va; et al. (eds.), initial reports of the deep sea drilling project (u.s. govt. printing office), 71, 409-422 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1983 |
url |
https://dx.doi.org/10.1594/pangaea.815065 https://doi.pangaea.de/10.1594/PANGAEA.815065 |
long_lat |
ENVELOPE(-55.817,-55.817,-63.133,-63.133) ENVELOPE(-61.257,-61.257,-69.924,-69.924) ENVELOPE(-50.000,-50.000,-51.000,-51.000) ENVELOPE(-43.500,-43.500,-50.667,-50.667) |
geographic |
Antarctic Southern Ocean The Antarctic Maurice Ewing Falkland Plateau Maurice Ewing Bank |
geographic_facet |
Antarctic Southern Ocean The Antarctic Maurice Ewing Falkland Plateau Maurice Ewing Bank |
genre |
Antarc* Antarctic South Atlantic Ocean Southern Ocean |
genre_facet |
Antarc* Antarctic South Atlantic Ocean Southern Ocean |
op_relation |
https://dx.doi.org/10.2973/dsdp.proc.71.117.1983 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.815065 https://doi.org/10.2973/dsdp.proc.71.117.1983 |
_version_ |
1766263334904004608 |
spelling |
ftdatacite:10.1594/pangaea.815065 2023-05-15T13:56:06+02:00 Oxygen and carbon isotopes from foraminifers and benthic foraminiferal abundance at DSDP Holes 71-511 and 71-512, supplement to: Muza, Jay Phillip; Williams, Douglas F; Wise, Sherwood W (1983): Paleogene oxygen record for Deep Sea Drilling Project Sites 511 and 512, subantarctic South Atlantic Ocean: Paleotemperatures, paleoceanographic changes, and the Eocene/Oligocene boundary event. In: Ludwig, WJ; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 71, 409-422 Muza, Jay Phillip Williams, Douglas F Wise, Sherwood W 1983 application/zip https://dx.doi.org/10.1594/pangaea.815065 https://doi.pangaea.de/10.1594/PANGAEA.815065 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.2973/dsdp.proc.71.117.1983 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Drilling/drill rig Leg71 Glomar Challenger Deep Sea Drilling Project DSDP Collection article Supplementary Collection of Datasets 1983 ftdatacite https://doi.org/10.1594/pangaea.815065 https://doi.org/10.2973/dsdp.proc.71.117.1983 2021-11-05T12:55:41Z An Eocene-Oligocene oxygen and carbon isotope history based on planktonic and benthic foraminifers from Deep Sea Drilling Project Leg 71 cores has been constructed for the Maurice Ewing Bank of the eastern Falkland Plateau, Southwest Atlantic Ocean. Specifically, the cores cover portions of the middle Eocene, upper Eocene, and lower Oligocene. Surface water isotopic temperatures postulated for the middle Eocene at Site 512 fluctuated within about four degrees but generally averaged about 9°C. Bottom isotopic temperatures at Site 512 (water depth, 1846 m) were generally a degree lower than surface water temperatures. Surface water isotopic temperatures at Site 511 initially averaged about 11°C during the late Eocene, but dropped to an average of 7°C in the early Oligocene. Bottom isotopic temperatures at Site 511 (water depth, 2589 m) generally record temperatures between 12.5°C and 8°C, similar to the range in the surface water isotopic temperatures. During the early Oligocene, bottom isotopic temperatures dropped sharply and averaged about 2°C (very close to present-day values). Surface water temperature values also decreased to an average of about 7°C, therefore leading to a significant divergence between surface and bottom water isotopic temperatures during the early Oligocene. Comparisons among Southern Ocean DSDP Sites 511, 512, and 277, and between these and other DSDP sites from central and northern latitudes (Sites 44, 167, 171, 292, 357, 398, 119, and 401) show that much of the Eocene was characterized by relatively warm temperatures until sometime in either the middle Eocene, late Eocene, or early Oligocene. At each site, conspicuous 18O enrichments occur in both the benthic and planktonic foraminifers over a relatively short period of time. Although a general trend toward a climatic deterioration is evident, the density of data points among the various studies is still too sparse to determine either synchrony or time-transgression between the major isotopic events. A close correlation could be made between the Site 511 oxygen isotope temperature curve and paleoclimatic trends derived independently from radiolarian studies. The sharp temperature drop and the divergence between bottom and surface water temperatures during the early Oligocene apparently reflect a major expansion of the antarctic water mass. The migration of the boundary between the subantarctic and antarctic water masses over the site at this time would account in part for the sharp temperature changes. Sharp changes of this nature would not necessarily be noted in other geographic areas, particularly those to the north which have different oceanographic regimes. Article in Journal/Newspaper Antarc* Antarctic South Atlantic Ocean Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean The Antarctic Maurice ENVELOPE(-55.817,-55.817,-63.133,-63.133) Ewing ENVELOPE(-61.257,-61.257,-69.924,-69.924) Falkland Plateau ENVELOPE(-50.000,-50.000,-51.000,-51.000) Maurice Ewing Bank ENVELOPE(-43.500,-43.500,-50.667,-50.667) |