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SUMMARY: Palaeoenvironmental records from the West Antarctic Peninsula dri
 ft sediments over the last 75 ka. - Dr Maryline Vautravers\, Earth Science
 s\, University of Cambridge
DTSTART:20121029T163000Z
DTEND:20121029T173000Z
UID:TALK40974@talks.cam.ac.uk
CONTACT:Steven Palmer
DESCRIPTION:We present results of a multi-proxy study on marine sediment c
 ore JR179-PC466 recovered from the crest of a sediment drift off the west 
 Antarctic Peninsula at roughly 2300 m water depth. The 10.45-m long core c
 onsists dominantly of glaciomarine terrigenous sediments with only traces 
 of calcium carbonate (<1 wt.%). Despite the very low abundance of calcareo
 us foraminifera\, planktonic shell numbers are sufficient for stable isoto
 pe analyses in 2/3 of the samples studied. The core chronology is based on
  oxygen isotope stratigraphy and correlation of its relative palaeomagneti
 c intensity (RPI) with a stacked reference curve.  Planktonic foraminifera
  are present in the Holocene\, but more abundant in sediments deposited du
 ring MIS3 (29-57 ka BP)\, owing to less dilution by terrigenous detritus a
 nd/or better carbonate preservation. During MIS3\, foraminifera maxima cor
 relate with Antarctic warming events as recorded in the d18O signal of the
  EPICA Dronning Maud Land (EDML) ice core. They indicate higher planktonic
  foraminifera production and better carbonate preservation west of the Ant
 arctic Peninsula during that time. The abundance of Ice Rafted Detritus (I
 RD) in core PC466 increased during the last deglaciation between ~19 and 1
 1 ka BP\, when numerous icebergs drifted across the core site\, thereby re
 leasing IRD. During this time sea-level rise destabilized the Antarctic Pe
 ninsula (APIS) and West Antarctic (WAIS) ice sheets that had advanced onto
  the shelf during the sea-level low-stand of the Last Glacial Maximum (LGM
 \; ~19-23 ka BP). Overall\, our results demonstrate that it is possible to
  establish an age model and reconstruct palaeoceanographic and climatologi
 c changes at high temporal resolution from sedimentary sequences recovered
  at 2300 m water depth from a West Antarctic drift.\n
LOCATION:Scott Polar Research Institute\, main lecture theatre
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