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SUMMARY:New insights into early Cenozoic glaciation: Eocene-Oligocene clim
 ate records from IODP Exp. 318\, Wilkes Land\, Antarctica - Claire Huck\, 
 National Oceanography Centre\, Univ of Southampton
DTSTART:20151124T160000Z
DTEND:20151124T170000Z
UID:TALK60393@talks.cam.ac.uk
CONTACT:Alex Piotrowski
DESCRIPTION:The Eocene (approx 56-34 Ma) and Oligocene (approx 34-23 Ma) E
 pochs encompass a 33-Myr time interval characterised by a major revolution
  in Earth’s climate from a Greenhouse to an Icehouse regime. The onset o
 f Antarctic glaciation at the Eocene-Oligocene Transition (EOT\; approx 33
 .7 Ma) is associated with evidence for rapidly decreasing atmospheric CO2 
 levels as well as major reorganisation of Southern Ocean tectonic gateways
  and ocean circulation patterns. In recent years\, however\, studies have 
 suggested both the potential for Antarctic glaciation during the high pCO2
 -world of the Eocene and large-scale instability of the Antarctic ice shee
 ts during the cool Oligocene\, highlighting that the relationships between
  the fundamental drivers of high-latitude climate are far from straight fo
 rward. \n\nThe Eocene and Oligocene climate history of Antarctica is prima
 rily known from a limited number of pelagic Southern Ocean sediment cores 
 (e.g.\, Maud Rise and Kerguelen Plateau). However\, in March 2010\, IODP E
 xpedition 318 sailed to the Wilkes Land margin of Antarctica and recovered
  a sedimentary drillcore section adjacent to the Wilkes Subglacial Basin t
 hat spans the Eocene and Oligocene. These cores provide unique insight int
 o regional climate change on the Antarctic continent over this crucial tim
 e period and serve as a link between ice-proximal and ice-distal climate r
 ecords of the Southern Ocean. I will discuss the Eocene-Oligocene erosiona
 l record of the Wilkes margin\, as reconstructed using the neodymium isoto
 pic composition of marine sediments. These data reveal both long-term and 
 short-term regional climate variability on the East Antarctic margin throu
 gh the Eocene-Oligocene time interval\, suggesting a potentially mobile An
 tarctic ice sheet during this time.\n
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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