Stable oxygen and carbon isotopes from ODP sites on Maud Rise and Kerguelen Plateau
Paleogene stable oxygen and carbon isotopes were measured in formainifera from ODP Sites 689 and 690 at Maud Rise in the Atlantic Ocean sector of the Southern Ocean, and from Sites 738, 744, 748 and 749 at the southern Kerguelen Plateau in the Indian Ocean sector. These data were compared with sedim...
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1992
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.759625 2023-05-15T13:42:10+02:00 Stable oxygen and carbon isotopes from ODP sites on Maud Rise and Kerguelen Plateau Mackensen, Andreas Ehrmann, Werner MEDIAN LATITUDE: -62.280625 * MEDIAN LONGITUDE: 50.705213 * SOUTH-BOUND LATITUDE: -65.161000 * WEST-BOUND LONGITUDE: 1.204900 * NORTH-BOUND LATITUDE: -58.441000 * EAST-BOUND LONGITUDE: 82.787800 * DATE/TIME START: 1987-01-16T08:00:00 * DATE/TIME END: 1988-03-25T09:45:00 1992-04-19 application/zip, 8 datasets https://doi.pangaea.de/10.1594/PANGAEA.759625 https://doi.org/10.1594/PANGAEA.759625 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.759625 https://doi.org/10.1594/PANGAEA.759625 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Mackensen, Andreas; Ehrmann, Werner (1992): Middle Eocene through early Oligocene climate history and paleoceanography in the Southern Ocean: Stable oxygen and carbon isotopes from ODP Sites on Maud Rise and Kerguelen Plateau. Marine Geology, 108(1), 1-27, https://doi.org/10.1016/0025-3227(92)90210-9 113-689B 113-690B 119-738B 119-744A 119-744B 120-748B 120-749B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg113 Leg119 Leg120 Ocean Drilling Program ODP South Atlantic Ocean South Indian Ridge South Indian Ocean Dataset 1992 ftpangaea https://doi.org/10.1594/PANGAEA.759625 https://doi.org/10.1016/0025-3227(92)90210-9 2023-01-20T07:32:08Z Paleogene stable oxygen and carbon isotopes were measured in formainifera from ODP Sites 689 and 690 at Maud Rise in the Atlantic Ocean sector of the Southern Ocean, and from Sites 738, 744, 748 and 749 at the southern Kerguelen Plateau in the Indian Ocean sector. These data were compared with sedimentological data from the same sample set. Both benthic and planktic d18O values document a cooling trend beginning around 49.5 Ma at all sites. During the late middle Eocene planktic d18O values indicate a steepening latitudinal temperature gradient from 14°C at the northern sites towards 10°C at the southernmost sites. Terrigeneous sand grains of probably ice rafted origin and clay mineral assemblages point to the existence of a limited East Antarctic ice cap with some glaciers reaching sea level as early as middle Eocene time around 45.5 Ma. Between 45 and 40 Ma, average paleotemperatures were between 5° and 7°C in deep and intermediate water masses, while near-surface water masses ranged between 6° and 10°C. During the late Eocene, between 40 and 36 Ma, average temperatures further decreased to 4°-5°C in the deep and intermediate water masses and to 5°-8°C near the sea surface. Abruptly increasing d18O values at approximately 35.9 Ma exactly correlate with a sharp pulse in the deposition of ice-rafted material on the Kerguelen Plateau, a dramatic change in clay mineral composition, and an altered Southern Ocean circulation indicated by a differentiation of benthic d13C values between sites, increasing opal concentrations and decreasing carbonate contents. For planktic and benthic foraminifera this d18O increase ranges between 1.0 and 1.3 per mil, and between 0.9 and 1.4 per mil, respectively. We favour a hypothesis that explains most of the d18O shift at 35.9 Ma with a buildup of a continental East Antarctic ice sheet. Consequently, relatively warm Oligocene Antarctic surface water temperatures probably are explained by a temperate, wet-based nature of the ice sheet. This would also aid in the fast build-up of an ... Dataset Antarc* Antarctic Ice cap Ice Sheet South Atlantic Ocean Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic East Antarctic Ice Sheet Indian Kerguelen Maud Rise ENVELOPE(3.000,3.000,-66.000,-66.000) Southern Ocean ENVELOPE(1.204900,82.787800,-58.441000,-65.161000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
113-689B 113-690B 119-738B 119-744A 119-744B 120-748B 120-749B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg113 Leg119 Leg120 Ocean Drilling Program ODP South Atlantic Ocean South Indian Ridge South Indian Ocean |
spellingShingle |
113-689B 113-690B 119-738B 119-744A 119-744B 120-748B 120-749B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg113 Leg119 Leg120 Ocean Drilling Program ODP South Atlantic Ocean South Indian Ridge South Indian Ocean Mackensen, Andreas Ehrmann, Werner Stable oxygen and carbon isotopes from ODP sites on Maud Rise and Kerguelen Plateau |
topic_facet |
113-689B 113-690B 119-738B 119-744A 119-744B 120-748B 120-749B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg113 Leg119 Leg120 Ocean Drilling Program ODP South Atlantic Ocean South Indian Ridge South Indian Ocean |
description |
Paleogene stable oxygen and carbon isotopes were measured in formainifera from ODP Sites 689 and 690 at Maud Rise in the Atlantic Ocean sector of the Southern Ocean, and from Sites 738, 744, 748 and 749 at the southern Kerguelen Plateau in the Indian Ocean sector. These data were compared with sedimentological data from the same sample set. Both benthic and planktic d18O values document a cooling trend beginning around 49.5 Ma at all sites. During the late middle Eocene planktic d18O values indicate a steepening latitudinal temperature gradient from 14°C at the northern sites towards 10°C at the southernmost sites. Terrigeneous sand grains of probably ice rafted origin and clay mineral assemblages point to the existence of a limited East Antarctic ice cap with some glaciers reaching sea level as early as middle Eocene time around 45.5 Ma. Between 45 and 40 Ma, average paleotemperatures were between 5° and 7°C in deep and intermediate water masses, while near-surface water masses ranged between 6° and 10°C. During the late Eocene, between 40 and 36 Ma, average temperatures further decreased to 4°-5°C in the deep and intermediate water masses and to 5°-8°C near the sea surface. Abruptly increasing d18O values at approximately 35.9 Ma exactly correlate with a sharp pulse in the deposition of ice-rafted material on the Kerguelen Plateau, a dramatic change in clay mineral composition, and an altered Southern Ocean circulation indicated by a differentiation of benthic d13C values between sites, increasing opal concentrations and decreasing carbonate contents. For planktic and benthic foraminifera this d18O increase ranges between 1.0 and 1.3 per mil, and between 0.9 and 1.4 per mil, respectively. We favour a hypothesis that explains most of the d18O shift at 35.9 Ma with a buildup of a continental East Antarctic ice sheet. Consequently, relatively warm Oligocene Antarctic surface water temperatures probably are explained by a temperate, wet-based nature of the ice sheet. This would also aid in the fast build-up of an ... |
format |
Dataset |
author |
Mackensen, Andreas Ehrmann, Werner |
author_facet |
Mackensen, Andreas Ehrmann, Werner |
author_sort |
Mackensen, Andreas |
title |
Stable oxygen and carbon isotopes from ODP sites on Maud Rise and Kerguelen Plateau |
title_short |
Stable oxygen and carbon isotopes from ODP sites on Maud Rise and Kerguelen Plateau |
title_full |
Stable oxygen and carbon isotopes from ODP sites on Maud Rise and Kerguelen Plateau |
title_fullStr |
Stable oxygen and carbon isotopes from ODP sites on Maud Rise and Kerguelen Plateau |
title_full_unstemmed |
Stable oxygen and carbon isotopes from ODP sites on Maud Rise and Kerguelen Plateau |
title_sort |
stable oxygen and carbon isotopes from odp sites on maud rise and kerguelen plateau |
publisher |
PANGAEA |
publishDate |
1992 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.759625 https://doi.org/10.1594/PANGAEA.759625 |
op_coverage |
MEDIAN LATITUDE: -62.280625 * MEDIAN LONGITUDE: 50.705213 * SOUTH-BOUND LATITUDE: -65.161000 * WEST-BOUND LONGITUDE: 1.204900 * NORTH-BOUND LATITUDE: -58.441000 * EAST-BOUND LONGITUDE: 82.787800 * DATE/TIME START: 1987-01-16T08:00:00 * DATE/TIME END: 1988-03-25T09:45:00 |
long_lat |
ENVELOPE(3.000,3.000,-66.000,-66.000) ENVELOPE(1.204900,82.787800,-58.441000,-65.161000) |
geographic |
Antarctic East Antarctic Ice Sheet Indian Kerguelen Maud Rise Southern Ocean |
geographic_facet |
Antarctic East Antarctic Ice Sheet Indian Kerguelen Maud Rise Southern Ocean |
genre |
Antarc* Antarctic Ice cap Ice Sheet South Atlantic Ocean Southern Ocean |
genre_facet |
Antarc* Antarctic Ice cap Ice Sheet South Atlantic Ocean Southern Ocean |
op_source |
Supplement to: Mackensen, Andreas; Ehrmann, Werner (1992): Middle Eocene through early Oligocene climate history and paleoceanography in the Southern Ocean: Stable oxygen and carbon isotopes from ODP Sites on Maud Rise and Kerguelen Plateau. Marine Geology, 108(1), 1-27, https://doi.org/10.1016/0025-3227(92)90210-9 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.759625 https://doi.org/10.1594/PANGAEA.759625 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.759625 https://doi.org/10.1016/0025-3227(92)90210-9 |
_version_ |
1766164039815135232 |