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SUMMARY:The paleoceanography frontier: proxies\, new technologies and nove
 l questions - Prof. Howard J. Spero (University of California)
DTSTART:20131024T150000Z
DTEND:20131024T170000Z
UID:TALK47789@talks.cam.ac.uk
CONTACT:27005
DESCRIPTION:*Please note different time and venue: Latimer Room\, 4pm*\n\n
 In recent years\, new geochemical proxies and emerging technologies have b
 een combined to explore novel paleoclimatic questions that were only dream
 ed about a decade ago. In this presentation I will discuss how the applica
 tion of new technologies such as laser ablation ICP-MS (e.g. Mg/Ca\, Ba/Ca
 )\, SIMS (e.g. d18O\, d13C) and nanoSIMS can be used to address old and ne
 w paleoceanographic problems. I will present data from laboratory experime
 nts with living planktonic foraminifera that have allowed us to calibrate 
 these proxies and reduce the spatial resolution of geochemical analyses to
  the micron and sub-micron level. These data confirm many of the fundament
 al geochemical relationships used by researchers to reconstruct ocean temp
 eratures and water geochemistry from the fossil record. When individual fo
 raminifera from a fossil assemblage are analyzed using LA-ICP-MS (Mg/Ca\, 
 Ba/Ca) and coupled to d18O measurements from standard isotope ratios mass 
 spectrometry (IRMS)\, we may be able to extract novel information from the
  fossil record that was not previously possible.  I will present data coll
 ected at the interface of these two geochemical technologies that has allo
 wed us to calculate the oxygen isotopic composition of Laurentide Ice Shee
 t meltwater during the last deglaciation.
LOCATION:Latimer  Room\, Clare College
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