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SUMMARY:1 million years of Pacific Ocean paleoceanography viewed from IODP
  Exp350 sites 1436C and 1437B foraminifers' records recovered near the IZU
  subduction Arc - Maryline Vautravers (University of Cambridge)
DTSTART:20160421T163000Z
DTEND:20160421T173000Z
UID:TALK65538@talks.cam.ac.uk
CONTACT:Della Murton
DESCRIPTION:In 2014 I sailed for 2 months on IODP EXP350 on board JOIDES R
 esolution\, South of Japan near the Izu-Arc formed by the subduction of th
 e West Pacific plate under the Phillippine plate.  The area investigated n
 ear 30° N is affected by the Kuroshio Current. The age models for 2 Sites
 \; U1436C and U1437B are based on stable isotopes stratigraphy N. dutertre
 i. The quantitative micropaleontological (planktonic foraminifer) content 
 for 460 samples includes the indices of calcium carbonate preservation\, i
 ndividual shell weight\, percent planktonic foraminifer fragments\, plankt
 onic foraminifer concentrations\, various faunal proxies\, and benthic/pla
 nktonic ratio. Altogether evidencing qualitative surface temperatures chan
 ges traced by faunal polar/subpolar versus subtropical assemblages recordi
 ng 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 t
 he Izu rise provide a rare insight opportunity into the operation of inter
 mediate circulations and the influence of Quaternary Northern Hemisphere g
 laciations on the operation of the intermediate water mass as can be trace
 d by changes in carbonates preservation recorded by foraminifers.  The stu
 dy points to the so-called Pacific carbonate cycles pattern recorded in th
 e NW Pacific at intermediate depth to be the result of climatological and/
 or geochemical changes originating in the North Atlantic affecting the NAD
 W production during interglacials and the NAGW during glacials. In term of
  paleoceanographic/climatic evolution it also points at MIS17 as a remarka
 ble interglacial within the Pacific Ocean realm.
LOCATION:Thirkill Room\, Clare College
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