Stable isotope record and trace element ratios of Eocene and Oligocene foraminifers from ODP Site 120-748
Stable carbon and oxygen isotope analyses were conducted on well-preserved planktonic and benthic foraminifers from a continuous middle Eocene to Oligocene sequence at Ocean Drilling Program (ODP) Site 748 on the Kerguelen Plateau. Benthic foraminifer d18O values show a 1.0 per mil increase through...
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1992
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.758907 2024-09-15T17:41:18+00:00 Stable isotope record and trace element ratios of Eocene and Oligocene foraminifers from ODP Site 120-748 Zachos, James C Berggren, William A Aubry, Marie-Pierre Mackensen, Andreas LATITUDE: -58.441000 * LONGITUDE: 78.998100 * DATE/TIME START: 1988-03-13T00:00:00 * DATE/TIME END: 1988-03-23T22:54:00 1992 application/zip, 6 datasets https://doi.pangaea.de/10.1594/PANGAEA.758907 https://doi.org/10.1594/PANGAEA.758907 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.758907 https://doi.org/10.1594/PANGAEA.758907 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Zachos, James C; Berggren, William A; Aubry, Marie-Pierre; Mackensen, Andreas (1992): Isotope and trace element geochemistry of Eocene and Oligocene foraminifers from Site 748, Kerguelen Plateau. In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 839-854, https://doi.org/10.2973/odp.proc.sr.120.183.1992 120-748 120-748B 120-748C COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg120 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean dataset publication series 1992 ftpangaea https://doi.org/10.1594/PANGAEA.75890710.2973/odp.proc.sr.120.183.1992 2024-07-24T02:31:20Z Stable carbon and oxygen isotope analyses were conducted on well-preserved planktonic and benthic foraminifers from a continuous middle Eocene to Oligocene sequence at Ocean Drilling Program (ODP) Site 748 on the Kerguelen Plateau. Benthic foraminifer d18O values show a 1.0 per mil increase through the middle and upper Eocene, followed by a rapid 1.2 per mil increase in the lowermost Oligocene (35.5 Ma). Surface-dwelling planktonic foraminifer d18O values increase in the lowermost Oligocene, but only by 0.6 per mil whereas intermediate-depth planktonic foraminifers show an increase of about l.0 per mil. Benthic foraminifer d13C values increase by 0.9 per mil in the lowermost Oligocene at precisely the same time as the large d18O increase, whereas planktonic foraminifer d13C values show little or no change. Site 748 oxygen isotope and paleontological records suggest that southern Indian Ocean surface and intermediate waters underwent significant cooling from the early to late Eocene. The rapid 1.2 per mil oxygen isotope increase recorded by benthic foraminifers just above the Eocene/Oligocene boundary represents the ubiquitous early Oligocene d18O event. The shift here is unique, however, as it coincided with the sudden appearance of ice-rafted debris (IRD), providing the first direct link between Antarctic glacial activity and the earliest Oligocene d18O increase. The d18O increase caused by the ice-volume change in the early Oligocene is constrained by (1) related changes in the planktonic to benthic foraminifer d18O gradient at Site 748 and (2) comparisons of late Eocene and early Oligocene planktonic foraminifer d18Ovalues from various latitudes. Both of these records indicate that 0.3 per mil to 0.4 per mil of the early Oligocene d18O increase was ice-volume related. Other/Unknown Material Antarc* Antarctic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(78.998100,78.998100,-58.441000,-58.441000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
120-748 120-748B 120-748C COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg120 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
spellingShingle |
120-748 120-748B 120-748C COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg120 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean Zachos, James C Berggren, William A Aubry, Marie-Pierre Mackensen, Andreas Stable isotope record and trace element ratios of Eocene and Oligocene foraminifers from ODP Site 120-748 |
topic_facet |
120-748 120-748B 120-748C COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg120 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
description |
Stable carbon and oxygen isotope analyses were conducted on well-preserved planktonic and benthic foraminifers from a continuous middle Eocene to Oligocene sequence at Ocean Drilling Program (ODP) Site 748 on the Kerguelen Plateau. Benthic foraminifer d18O values show a 1.0 per mil increase through the middle and upper Eocene, followed by a rapid 1.2 per mil increase in the lowermost Oligocene (35.5 Ma). Surface-dwelling planktonic foraminifer d18O values increase in the lowermost Oligocene, but only by 0.6 per mil whereas intermediate-depth planktonic foraminifers show an increase of about l.0 per mil. Benthic foraminifer d13C values increase by 0.9 per mil in the lowermost Oligocene at precisely the same time as the large d18O increase, whereas planktonic foraminifer d13C values show little or no change. Site 748 oxygen isotope and paleontological records suggest that southern Indian Ocean surface and intermediate waters underwent significant cooling from the early to late Eocene. The rapid 1.2 per mil oxygen isotope increase recorded by benthic foraminifers just above the Eocene/Oligocene boundary represents the ubiquitous early Oligocene d18O event. The shift here is unique, however, as it coincided with the sudden appearance of ice-rafted debris (IRD), providing the first direct link between Antarctic glacial activity and the earliest Oligocene d18O increase. The d18O increase caused by the ice-volume change in the early Oligocene is constrained by (1) related changes in the planktonic to benthic foraminifer d18O gradient at Site 748 and (2) comparisons of late Eocene and early Oligocene planktonic foraminifer d18Ovalues from various latitudes. Both of these records indicate that 0.3 per mil to 0.4 per mil of the early Oligocene d18O increase was ice-volume related. |
format |
Other/Unknown Material |
author |
Zachos, James C Berggren, William A Aubry, Marie-Pierre Mackensen, Andreas |
author_facet |
Zachos, James C Berggren, William A Aubry, Marie-Pierre Mackensen, Andreas |
author_sort |
Zachos, James C |
title |
Stable isotope record and trace element ratios of Eocene and Oligocene foraminifers from ODP Site 120-748 |
title_short |
Stable isotope record and trace element ratios of Eocene and Oligocene foraminifers from ODP Site 120-748 |
title_full |
Stable isotope record and trace element ratios of Eocene and Oligocene foraminifers from ODP Site 120-748 |
title_fullStr |
Stable isotope record and trace element ratios of Eocene and Oligocene foraminifers from ODP Site 120-748 |
title_full_unstemmed |
Stable isotope record and trace element ratios of Eocene and Oligocene foraminifers from ODP Site 120-748 |
title_sort |
stable isotope record and trace element ratios of eocene and oligocene foraminifers from odp site 120-748 |
publisher |
PANGAEA |
publishDate |
1992 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.758907 https://doi.org/10.1594/PANGAEA.758907 |
op_coverage |
LATITUDE: -58.441000 * LONGITUDE: 78.998100 * DATE/TIME START: 1988-03-13T00:00:00 * DATE/TIME END: 1988-03-23T22:54:00 |
long_lat |
ENVELOPE(78.998100,78.998100,-58.441000,-58.441000) |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Supplement to: Zachos, James C; Berggren, William A; Aubry, Marie-Pierre; Mackensen, Andreas (1992): Isotope and trace element geochemistry of Eocene and Oligocene foraminifers from Site 748, Kerguelen Plateau. In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 839-854, https://doi.org/10.2973/odp.proc.sr.120.183.1992 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.758907 https://doi.org/10.1594/PANGAEA.758907 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.75890710.2973/odp.proc.sr.120.183.1992 |
_version_ |
1810487441225678848 |