Relative abunances of benthic foraminifera in Late Oligocene to Miocene sediments of ODP Hole 121-757B from the southeastern Indian Ocean (Appendix Table 1)
We quantitatively analyzed deep-sea benthic foraminifera from >125 µm size fraction from Ocean Drilling Program (ODP) Site 757 to understand deep-sea paleoceanographic changes in the southeastern Indian Ocean during the late Oligocene-Miocene (26.5–5.35 Ma). We used the knowledge of the ecology o...
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2004
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ftdatacite:10.15468/rnrqfg 2023-05-15T13:43:43+02:00 Relative abunances of benthic foraminifera in Late Oligocene to Miocene sediments of ODP Hole 121-757B from the southeastern Indian Ocean (Appendix Table 1) Singh, Raj K Gupta, Anil K 2004 https://dx.doi.org/10.15468/rnrqfg https://www.gbif.org/dataset/95498928-f762-11e1-a439-00145eb45e9a en eng PANGAEA - Publishing Network for Geoscientific and Environmental Data https://dx.doi.org/10.1594/pangaea.676895 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY OCCURRENCE Dataset dataset 2004 ftdatacite https://doi.org/10.15468/rnrqfg https://doi.org/10.1594/pangaea.676895 2022-04-01T17:07:31Z We quantitatively analyzed deep-sea benthic foraminifera from >125 µm size fraction from Ocean Drilling Program (ODP) Site 757 to understand deep-sea paleoceanographic changes in the southeastern Indian Ocean during the late Oligocene-Miocene (26.5–5.35 Ma). We used the knowledge of the ecology of Recent deep-sea benthic foraminifera for environmental interpretations. Factor and cluster analyses were run using percentages of 46 highest-ranked species that helped identify six biofacies defining six clusters of samples. The faunal data document a major shift in deep-sea ventilation, organic carbon flux and productivity at ~8.3 Ma, coinciding with the major intensification of the Indian Ocean monsoon system. This marks a change from cold and well-oxygenated deep waters with low and pulsed organic carbon flux during 26.5 to ~8.3 Ma to oxygen-poor deep waters with sustained flux of organic matter. From 15.0 to 7.6 Ma, the deep-sea currents were stronger in the southeastern Indian Ocean probably due to major expansion of the East Antarctic ice sheet and increased production of deep waters and in turn increased deep-sea circulation. The productivity increased in the Indo-Pacific region in the late Miocene and the modern monsoon regime probably established at 8.3 Ma. Dataset Antarc* Antarctic Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) Antarctic East Antarctic Ice Sheet Pacific Indian |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
description |
We quantitatively analyzed deep-sea benthic foraminifera from >125 µm size fraction from Ocean Drilling Program (ODP) Site 757 to understand deep-sea paleoceanographic changes in the southeastern Indian Ocean during the late Oligocene-Miocene (26.5–5.35 Ma). We used the knowledge of the ecology of Recent deep-sea benthic foraminifera for environmental interpretations. Factor and cluster analyses were run using percentages of 46 highest-ranked species that helped identify six biofacies defining six clusters of samples. The faunal data document a major shift in deep-sea ventilation, organic carbon flux and productivity at ~8.3 Ma, coinciding with the major intensification of the Indian Ocean monsoon system. This marks a change from cold and well-oxygenated deep waters with low and pulsed organic carbon flux during 26.5 to ~8.3 Ma to oxygen-poor deep waters with sustained flux of organic matter. From 15.0 to 7.6 Ma, the deep-sea currents were stronger in the southeastern Indian Ocean probably due to major expansion of the East Antarctic ice sheet and increased production of deep waters and in turn increased deep-sea circulation. The productivity increased in the Indo-Pacific region in the late Miocene and the modern monsoon regime probably established at 8.3 Ma. |
format |
Dataset |
author |
Singh, Raj K Gupta, Anil K |
spellingShingle |
Singh, Raj K Gupta, Anil K Relative abunances of benthic foraminifera in Late Oligocene to Miocene sediments of ODP Hole 121-757B from the southeastern Indian Ocean (Appendix Table 1) |
author_facet |
Singh, Raj K Gupta, Anil K |
author_sort |
Singh, Raj K |
title |
Relative abunances of benthic foraminifera in Late Oligocene to Miocene sediments of ODP Hole 121-757B from the southeastern Indian Ocean (Appendix Table 1) |
title_short |
Relative abunances of benthic foraminifera in Late Oligocene to Miocene sediments of ODP Hole 121-757B from the southeastern Indian Ocean (Appendix Table 1) |
title_full |
Relative abunances of benthic foraminifera in Late Oligocene to Miocene sediments of ODP Hole 121-757B from the southeastern Indian Ocean (Appendix Table 1) |
title_fullStr |
Relative abunances of benthic foraminifera in Late Oligocene to Miocene sediments of ODP Hole 121-757B from the southeastern Indian Ocean (Appendix Table 1) |
title_full_unstemmed |
Relative abunances of benthic foraminifera in Late Oligocene to Miocene sediments of ODP Hole 121-757B from the southeastern Indian Ocean (Appendix Table 1) |
title_sort |
relative abunances of benthic foraminifera in late oligocene to miocene sediments of odp hole 121-757b from the southeastern indian ocean (appendix table 1) |
publisher |
PANGAEA - Publishing Network for Geoscientific and Environmental Data |
publishDate |
2004 |
url |
https://dx.doi.org/10.15468/rnrqfg https://www.gbif.org/dataset/95498928-f762-11e1-a439-00145eb45e9a |
geographic |
Antarctic East Antarctic Ice Sheet Pacific Indian |
geographic_facet |
Antarctic East Antarctic Ice Sheet Pacific Indian |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_relation |
https://dx.doi.org/10.1594/pangaea.676895 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.15468/rnrqfg https://doi.org/10.1594/pangaea.676895 |
_version_ |
1766192308631371776 |