Neogene benthic foraminifers from the Kerguelen Plateau
Benthic foraminifers were studied quantitatively in 120 lower Miocene through upper Pleistocene samples from Ocean Drilling Program Site 747 (Central Kerguelen Plateau) and Sites 748 and 751 (Southern Kerguelen Plateau). These sites are situated on an 450-km-long, north-south transect between 54°49&...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.760258 2024-09-15T17:44:16+00:00 Neogene benthic foraminifers from the Kerguelen Plateau Mackensen, Andreas MEDIAN LATITUDE: -56.818133 * MEDIAN LONGITUDE: 78.396303 * SOUTH-BOUND LATITUDE: -58.441000 * WEST-BOUND LONGITUDE: 76.794000 * NORTH-BOUND LATITUDE: -54.811000 * EAST-BOUND LONGITUDE: 79.814800 * DATE/TIME START: 1988-03-06T22:30:00 * DATE/TIME END: 1988-04-19T23:30:00 1992 application/zip, 6 datasets https://doi.pangaea.de/10.1594/PANGAEA.760258 https://doi.org/10.1594/PANGAEA.760258 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.760258 https://doi.org/10.1594/PANGAEA.760258 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Mackensen, Andreas (1992): Neogene benthic foraminifers from the southern Indian Ocean (Kerguelen Plateau): biostratigraphy and Paleoecology. In: S.W. Wise, JR., R. Schlich, et al., Proceedings of the Ocean Drilling Program, Scientific Results, 120, College Station, TX (Ocean Drilling Program), 649-674, https://doi.org/10.2973/odp.proc.sr.120.167.1992 120-747A 120-748B 120-751A 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.76025810.2973/odp.proc.sr.120.167.1992 2024-07-24T02:31:20Z Benthic foraminifers were studied quantitatively in 120 lower Miocene through upper Pleistocene samples from Ocean Drilling Program Site 747 (Central Kerguelen Plateau) and Sites 748 and 751 (Southern Kerguelen Plateau). These sites are situated on an 450-km-long, north-south transect between 54°49'S and 58°26'S at present water depths between 1696 and 1288 m. Principal component analysis on the census data of the most abundant 92 taxa helped to identify 8 benthic foraminifer assemblages. These benthic foraminifer assemblages were compared with Holocene faunas from southern high latitudes to reconstruct paleoenvironmental conditions. Middle lower Miocene sediments are characterized by a Uvigerina hispidocostata assemblage, indicating high paleoproductivity and/or not well-ventilated bottom water. From late early to late middle Miocene time, the Southern Kerguelen Plateau was bathed by a young, well-oxygenated, and carbonate-aggressive water mass, as indicated by a Nuttallides umbonifer-dominated benthic foraminifer assemblage. During late middle Miocene time, an Astrononion pusillum assemblage took over for only about 1 m.y., probably indicating the first injection of an aged water mass, similar to the North Atlantic Deep Water (NADW), into a developing circumpolar current system. Around the middle to late Miocene boundary, the fauna again became dominated by N. umbonifer. After the last appearance of N. umbonifer, reestablishment of the A. pusillum assemblage from the early late through at least the late late Miocene, indicated the established influence of a NADW-like water mass. The latest Miocene through middle late Pliocene benthic foraminifer assemblage was characterized by Epistominella exigua and strong carbonate dissolution, indicating very high biosiliceous production, and this in turn may indicate the formation and paleoposition of an Antarctic Polar Frontal Zone. From the late late Pliocene, a Trifarina angulosa assemblage (indicative today of sandy substrate and vigorous bottom currents) strongly ... Other/Unknown Material Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(76.794000,79.814800,-54.811000,-58.441000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
120-747A 120-748B 120-751A DRILL Drilling/drill rig Joides Resolution Leg120 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
spellingShingle |
120-747A 120-748B 120-751A DRILL Drilling/drill rig Joides Resolution Leg120 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean Mackensen, Andreas Neogene benthic foraminifers from the Kerguelen Plateau |
topic_facet |
120-747A 120-748B 120-751A DRILL Drilling/drill rig Joides Resolution Leg120 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
description |
Benthic foraminifers were studied quantitatively in 120 lower Miocene through upper Pleistocene samples from Ocean Drilling Program Site 747 (Central Kerguelen Plateau) and Sites 748 and 751 (Southern Kerguelen Plateau). These sites are situated on an 450-km-long, north-south transect between 54°49'S and 58°26'S at present water depths between 1696 and 1288 m. Principal component analysis on the census data of the most abundant 92 taxa helped to identify 8 benthic foraminifer assemblages. These benthic foraminifer assemblages were compared with Holocene faunas from southern high latitudes to reconstruct paleoenvironmental conditions. Middle lower Miocene sediments are characterized by a Uvigerina hispidocostata assemblage, indicating high paleoproductivity and/or not well-ventilated bottom water. From late early to late middle Miocene time, the Southern Kerguelen Plateau was bathed by a young, well-oxygenated, and carbonate-aggressive water mass, as indicated by a Nuttallides umbonifer-dominated benthic foraminifer assemblage. During late middle Miocene time, an Astrononion pusillum assemblage took over for only about 1 m.y., probably indicating the first injection of an aged water mass, similar to the North Atlantic Deep Water (NADW), into a developing circumpolar current system. Around the middle to late Miocene boundary, the fauna again became dominated by N. umbonifer. After the last appearance of N. umbonifer, reestablishment of the A. pusillum assemblage from the early late through at least the late late Miocene, indicated the established influence of a NADW-like water mass. The latest Miocene through middle late Pliocene benthic foraminifer assemblage was characterized by Epistominella exigua and strong carbonate dissolution, indicating very high biosiliceous production, and this in turn may indicate the formation and paleoposition of an Antarctic Polar Frontal Zone. From the late late Pliocene, a Trifarina angulosa assemblage (indicative today of sandy substrate and vigorous bottom currents) strongly ... |
format |
Other/Unknown Material |
author |
Mackensen, Andreas |
author_facet |
Mackensen, Andreas |
author_sort |
Mackensen, Andreas |
title |
Neogene benthic foraminifers from the Kerguelen Plateau |
title_short |
Neogene benthic foraminifers from the Kerguelen Plateau |
title_full |
Neogene benthic foraminifers from the Kerguelen Plateau |
title_fullStr |
Neogene benthic foraminifers from the Kerguelen Plateau |
title_full_unstemmed |
Neogene benthic foraminifers from the Kerguelen Plateau |
title_sort |
neogene benthic foraminifers from the kerguelen plateau |
publisher |
PANGAEA |
publishDate |
1992 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.760258 https://doi.org/10.1594/PANGAEA.760258 |
op_coverage |
MEDIAN LATITUDE: -56.818133 * MEDIAN LONGITUDE: 78.396303 * SOUTH-BOUND LATITUDE: -58.441000 * WEST-BOUND LONGITUDE: 76.794000 * NORTH-BOUND LATITUDE: -54.811000 * EAST-BOUND LONGITUDE: 79.814800 * DATE/TIME START: 1988-03-06T22:30:00 * DATE/TIME END: 1988-04-19T23:30:00 |
long_lat |
ENVELOPE(76.794000,79.814800,-54.811000,-58.441000) |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
op_source |
Supplement to: Mackensen, Andreas (1992): Neogene benthic foraminifers from the southern Indian Ocean (Kerguelen Plateau): biostratigraphy and Paleoecology. In: S.W. Wise, JR., R. Schlich, et al., Proceedings of the Ocean Drilling Program, Scientific Results, 120, College Station, TX (Ocean Drilling Program), 649-674, https://doi.org/10.2973/odp.proc.sr.120.167.1992 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.760258 https://doi.org/10.1594/PANGAEA.760258 |
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.76025810.2973/odp.proc.sr.120.167.1992 |
_version_ |
1810491692292243456 |