Benthic foraminiferal changes across the miocene/pliocene boundary in the Northern Indian ocean: paleoceanographic implications
The distribution pattern of deep sea bemhic foraminifera across the Miocene/ Pliocene boundary in the northern Indian Ocean DSDP sites 219, 237 and 238 were examined in order to determine their relationship with the bottom water circulation pattern. Of the 153 species of benthic foraminifera encount...
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ftindianacasci:oai:repository.ias.ac.in:89849 2023-05-15T13:59:04+02:00 Benthic foraminiferal changes across the miocene/pliocene boundary in the Northern Indian ocean: paleoceanographic implications Rai, Ajai K. Srinivasan, M. S. 1993 http://repository.ias.ac.in/89849/ unknown Indian National Science Academy Rai, Ajai K. Srinivasan, M. S. (1993) Benthic foraminiferal changes across the miocene/pliocene boundary in the Northern Indian ocean: paleoceanographic implications Proceedings of the Indian National Science Academy - Part A: Physical Sciences, 59 (6). pp. 507-518. ISSN 0370-0046 QE Geology Article PeerReviewed 1993 ftindianacasci 2013-01-20T13:36:25Z The distribution pattern of deep sea bemhic foraminifera across the Miocene/ Pliocene boundary in the northern Indian Ocean DSDP sites 219, 237 and 238 were examined in order to determine their relationship with the bottom water circulation pattern. Of the 153 species of benthic foraminifera encountered at the Miocene/Pliocene transition Uvigerina spp. [mainly U. probosci-dw): Cibicides wuellerstorfi, C kullenbergi Globoaissidulinn subglobosa, Buli-mina alazanensis, Oridorsalis umbonatus and Stilostomella lepidula show marked changes in their relative abundances. The relative abundance curves of dominant bemhic foramimleral taxa. species diversity; H(SJ and equitahiltty; t' during Miocene/Pliocene transition at the DSDP situs 219, 237 and 238 were taken into account Lo explain bottom water history in the northern Indian Ocean. The latest Miocene and earliest Pliocene in all the examined sites are marked by fagh Uvigerina spp. abundances, bottom water cooling, increased upwellmg and intensified bottom water circulation. However, low abundance of Uvigerina spp. at 5.2 Ma (Miocene/Pliocene boundary) suggests a short interval of relative warming of bottom waters. The intermittent peaks of occurrence of Nuttallides umbonifera at site 238 relied recurrent incursions of Antarctic Bottom WalerjAABW) in this region. Article in Journal/Newspaper Antarc* Antarctic Indian Academy of Sciences: Publication of Fellows Antarctic Indian |
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Open Polar |
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Indian Academy of Sciences: Publication of Fellows |
op_collection_id |
ftindianacasci |
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topic |
QE Geology |
spellingShingle |
QE Geology Rai, Ajai K. Srinivasan, M. S. Benthic foraminiferal changes across the miocene/pliocene boundary in the Northern Indian ocean: paleoceanographic implications |
topic_facet |
QE Geology |
description |
The distribution pattern of deep sea bemhic foraminifera across the Miocene/ Pliocene boundary in the northern Indian Ocean DSDP sites 219, 237 and 238 were examined in order to determine their relationship with the bottom water circulation pattern. Of the 153 species of benthic foraminifera encountered at the Miocene/Pliocene transition Uvigerina spp. [mainly U. probosci-dw): Cibicides wuellerstorfi, C kullenbergi Globoaissidulinn subglobosa, Buli-mina alazanensis, Oridorsalis umbonatus and Stilostomella lepidula show marked changes in their relative abundances. The relative abundance curves of dominant bemhic foramimleral taxa. species diversity; H(SJ and equitahiltty; t' during Miocene/Pliocene transition at the DSDP situs 219, 237 and 238 were taken into account Lo explain bottom water history in the northern Indian Ocean. The latest Miocene and earliest Pliocene in all the examined sites are marked by fagh Uvigerina spp. abundances, bottom water cooling, increased upwellmg and intensified bottom water circulation. However, low abundance of Uvigerina spp. at 5.2 Ma (Miocene/Pliocene boundary) suggests a short interval of relative warming of bottom waters. The intermittent peaks of occurrence of Nuttallides umbonifera at site 238 relied recurrent incursions of Antarctic Bottom WalerjAABW) in this region. |
format |
Article in Journal/Newspaper |
author |
Rai, Ajai K. Srinivasan, M. S. |
author_facet |
Rai, Ajai K. Srinivasan, M. S. |
author_sort |
Rai, Ajai K. |
title |
Benthic foraminiferal changes across the miocene/pliocene boundary in the Northern Indian ocean: paleoceanographic implications |
title_short |
Benthic foraminiferal changes across the miocene/pliocene boundary in the Northern Indian ocean: paleoceanographic implications |
title_full |
Benthic foraminiferal changes across the miocene/pliocene boundary in the Northern Indian ocean: paleoceanographic implications |
title_fullStr |
Benthic foraminiferal changes across the miocene/pliocene boundary in the Northern Indian ocean: paleoceanographic implications |
title_full_unstemmed |
Benthic foraminiferal changes across the miocene/pliocene boundary in the Northern Indian ocean: paleoceanographic implications |
title_sort |
benthic foraminiferal changes across the miocene/pliocene boundary in the northern indian ocean: paleoceanographic implications |
publisher |
Indian National Science Academy |
publishDate |
1993 |
url |
http://repository.ias.ac.in/89849/ |
geographic |
Antarctic Indian |
geographic_facet |
Antarctic Indian |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Rai, Ajai K. Srinivasan, M. S. (1993) Benthic foraminiferal changes across the miocene/pliocene boundary in the Northern Indian ocean: paleoceanographic implications Proceedings of the Indian National Science Academy - Part A: Physical Sciences, 59 (6). pp. 507-518. ISSN 0370-0046 |
_version_ |
1766267433743548416 |