Please use this identifier to cite or link to this item: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/3787
Title: Late Eocene onset of the Proto-Antarctic Circumpolar Current
Authors: SARKAR, SUDIPTA
Basak, Chandranath
Frank, Martin
Berndt, Christian
Huuse, Mads
Badhanis, Shray
Bialas, Joerg
Dept. of Earth and Climate Science
Keywords: Eastern New-Zealand
Fossil fish teeth
Southern-Ocean
Deep-water
Pacific-ocean
Climate-change
Bounty trough
Seawater SR
Circulation
Evolution
TOC-JUL-2019
2019
Issue Date: Jul-2019
Publisher: Nature Publishing Group
Citation: Scientific Reports, 9.
Abstract: The formation of the Antarctic Circumpolar Current (ACC) is critical for the evolution of the global climate, but the timing of its onset is not well constrained. Here, we present new seismic evidence of widespread Late Eocene to Oligocene marine diagenetic chert in sedimentary drift deposits east of New Zealand indicating prolonged periods of blooms of siliceous microorganisms starting ~36 million years ago (Ma). These major blooms refect the initiation of the arrival and upwelling of northern-sourced, nutrient-rich deep equatorial Pacifc waters at the high latitudes of the South Pacifc. We show that this change in circulation was linked to the initiation of a proto-ACC, which occurred ~6Ma earlier than the currently estimated onset of the ACC at 30Ma. We propose that the associated increased primary productivity and carbon burial facilitated atmospheric carbon dioxide reduction contributing to the expansion of Antarctic Ice Sheet at the Eocene-Oligocene Transition.
URI: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/3787
https://doi.org/10.1038/s41598-019-46253-1
ISSN: 2045-2322
Appears in Collections:JOURNAL ARTICLES

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