1 million years of Pacific Ocean paleoceanography viewed from IODP Exp350 sites 1436C and 1437B foraminifers' records recovered near the IZU subduction Arc

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• Maryline Vautravers (University of Cambridge)
• Thursday 21 April 2016, 17:30-18:30
• Thirkill Room, Clare College.

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In 2014 I sailed for 2 months on IODP EXP350 on board JOIDES Resolution, South of Japan near the Izu-Arc formed by the subduction of the West Pacific plate under the Phillippine plate. The area investigated near 30° N is affected by the Kuroshio Current. The age models for 2 Sites; U1436C and U1437B are based on stable isotopes stratigraphy N. dutertrei. The quantitative micropaleontological (planktonic foraminifer) content for 460 samples includes the indices of calcium carbonate preservation, individual shell weight, percent planktonic foraminifer fragments, planktonic foraminifer concentrations, various faunal proxies, and benthic/planktonic ratio. Altogether evidencing qualitative surface temperatures changes traced by faunal polar/subpolar versus subtropical assemblages recording the changing influences in the Kuroshio/Oyashio currents over the last 1 My. The remarkable locations of the sites at intermediate water depth in the Pacific Ocean; but separated by the hydrographic divide created by the Izu rise provide a rare insight opportunity into the operation of intermediate circulations and the influence of Quaternary Northern Hemisphere glaciations on the operation of the intermediate water mass as can be traced by changes in carbonates preservation recorded by foraminifers. The study points to the so-called Pacific carbonate cycles pattern recorded in the NW Pacific at intermediate depth to be the result of climatological and/or geochemical changes originating in the North Atlantic affecting the NADW production during interglacials and the NAGW during glacials. In term of paleoceanographic/climatic evolution it also points at MIS17 as a remarkable interglacial within the Pacific Ocean realm.

This talk is part of the Quaternary Discussion Group (QDG) series.

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