Uvigerina proboscidea abundances and paleoceanography of the northern Indian Ocean DSDP Site 214 during the late neogene
This study attempts to understand the significance of Uvigerina proboscidea in paleoceanographic reconstructions at the northern (tropical) Indian Ocean DSDP Site 214 from the Late Miocene through the Pleistocene. In this interval at this site, U. proboscidea is the most abundant species of the bent...
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1992
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ftindianacasci:oai:repository.ias.ac.in:21962 2023-05-15T14:02:40+02:00 Uvigerina proboscidea abundances and paleoceanography of the northern Indian Ocean DSDP Site 214 during the late neogene Gupta, Anil K. Srinivasan, M. S. 1992-08 http://repository.ias.ac.in/21962/ http://linkinghub.elsevier.com/retrieve/pii/037783989290038L unknown Elsevier Science Gupta, Anil K. Srinivasan, M. S. (1992) Uvigerina proboscidea abundances and paleoceanography of the northern Indian Ocean DSDP Site 214 during the late neogene Marine Micropaleontology, 19 (4). pp. 355-367. ISSN 0377-8398 QE Geology Article PeerReviewed 1992 ftindianacasci 2013-01-20T10:26:08Z This study attempts to understand the significance of Uvigerina proboscidea in paleoceanographic reconstructions at the northern (tropical) Indian Ocean DSDP Site 214 from the Late Miocene through the Pleistocene. In this interval at this site, U. proboscidea is the most abundant species of the benthic assemblage and shows abrupt frequency changes (about 1-74%). Based on relative percentages of U. proboscidea calibrated with oxygen and carbon isotope record and the sediment accumulation rates, the modern distribution of the species in the Indian Ocean, and other evidence, the peaks of abundance of U. proboscidea are inferred to represent times of high-surface productivity. This productivity is related to intensified trade winds during strong southwest (SW) Indian monsoons, causing widespread upwelling along equatorial divergence in the Indian Ocean. The sudden increase of U. proboscidea abundance at approximately 8.5-7.5 Ma reflects significant upwelling at the equatorial divergence. This event corresponds to the permanent build-up of West Antarctic ice sheets, and a major increase in SW Indian monsoons related upwelling in the northwestern Indian Ocean. The Chron-6 carbon shift at approximately 6.2 Ma is marked by another peak of abundance, reflecting widespread ocean fertility. The highest abundances of U. proboscidea and highest sediment accumulation rates occur between 5.8 and 5.1 Ma, which coincides with the greatest development of Antarctic ice sheets and strong southwest monsoons. The higher percentages at 3.2-3.1 Ma, approximately 2.4 Ma, and 1.6 Ma all represent phases of high productivity at the equatorial divergence. Article in Journal/Newspaper Antarc* Antarctic Indian Academy of Sciences: Publication of Fellows Antarctic Indian |
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Open Polar |
collection |
Indian Academy of Sciences: Publication of Fellows |
op_collection_id |
ftindianacasci |
language |
unknown |
topic |
QE Geology |
spellingShingle |
QE Geology Gupta, Anil K. Srinivasan, M. S. Uvigerina proboscidea abundances and paleoceanography of the northern Indian Ocean DSDP Site 214 during the late neogene |
topic_facet |
QE Geology |
description |
This study attempts to understand the significance of Uvigerina proboscidea in paleoceanographic reconstructions at the northern (tropical) Indian Ocean DSDP Site 214 from the Late Miocene through the Pleistocene. In this interval at this site, U. proboscidea is the most abundant species of the benthic assemblage and shows abrupt frequency changes (about 1-74%). Based on relative percentages of U. proboscidea calibrated with oxygen and carbon isotope record and the sediment accumulation rates, the modern distribution of the species in the Indian Ocean, and other evidence, the peaks of abundance of U. proboscidea are inferred to represent times of high-surface productivity. This productivity is related to intensified trade winds during strong southwest (SW) Indian monsoons, causing widespread upwelling along equatorial divergence in the Indian Ocean. The sudden increase of U. proboscidea abundance at approximately 8.5-7.5 Ma reflects significant upwelling at the equatorial divergence. This event corresponds to the permanent build-up of West Antarctic ice sheets, and a major increase in SW Indian monsoons related upwelling in the northwestern Indian Ocean. The Chron-6 carbon shift at approximately 6.2 Ma is marked by another peak of abundance, reflecting widespread ocean fertility. The highest abundances of U. proboscidea and highest sediment accumulation rates occur between 5.8 and 5.1 Ma, which coincides with the greatest development of Antarctic ice sheets and strong southwest monsoons. The higher percentages at 3.2-3.1 Ma, approximately 2.4 Ma, and 1.6 Ma all represent phases of high productivity at the equatorial divergence. |
format |
Article in Journal/Newspaper |
author |
Gupta, Anil K. Srinivasan, M. S. |
author_facet |
Gupta, Anil K. Srinivasan, M. S. |
author_sort |
Gupta, Anil K. |
title |
Uvigerina proboscidea abundances and paleoceanography of the northern Indian Ocean DSDP Site 214 during the late neogene |
title_short |
Uvigerina proboscidea abundances and paleoceanography of the northern Indian Ocean DSDP Site 214 during the late neogene |
title_full |
Uvigerina proboscidea abundances and paleoceanography of the northern Indian Ocean DSDP Site 214 during the late neogene |
title_fullStr |
Uvigerina proboscidea abundances and paleoceanography of the northern Indian Ocean DSDP Site 214 during the late neogene |
title_full_unstemmed |
Uvigerina proboscidea abundances and paleoceanography of the northern Indian Ocean DSDP Site 214 during the late neogene |
title_sort |
uvigerina proboscidea abundances and paleoceanography of the northern indian ocean dsdp site 214 during the late neogene |
publisher |
Elsevier Science |
publishDate |
1992 |
url |
http://repository.ias.ac.in/21962/ http://linkinghub.elsevier.com/retrieve/pii/037783989290038L |
geographic |
Antarctic Indian |
geographic_facet |
Antarctic Indian |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Gupta, Anil K. Srinivasan, M. S. (1992) Uvigerina proboscidea abundances and paleoceanography of the northern Indian Ocean DSDP Site 214 during the late neogene Marine Micropaleontology, 19 (4). pp. 355-367. ISSN 0377-8398 |
_version_ |
1766273011552354304 |