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SUMMARY:Geological Histories of Earth and Mars - Vic Baker\, University of
  Arizona
DTSTART:20121009T153000Z
DTEND:20121009T163000Z
UID:TALK38983@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:International Section of GSA's choice for a Distinguished Lect
 urer.\n\nRecent advances in astronomy hold the prospect of discovery of a 
 great many Earth-like planets\, rich in both water and possible habitats f
 or life\, thereby greatly expanding from the current sample of one.  Never
 theless\, until it proves possible to do geology for these numerous potent
 ial exo-Earths\, we can greatly advance the geological science of Earth-li
 ke planets by study of Mars. \n \nThe early geological histories of both M
 ars and Earth are closely tied to the role of water\, extending from the n
 ature of planetary accretion to the origin of a physically coupled atmosph
 ere and ocean\, the prospects for initiating plate tectonics\, and histori
 cal records of punctuated greenhouse-to-icehouse climatic transitions.  Re
 cent discoveries from Mars missions reveal the extensive role of water in 
 generating sedimentary rocks\, active and relict glacial and periglacial f
 eatures\, aqueous weathering products (clay minerals and sulfates)\, alluv
 ial fans and deltas\, the extensive development of paleolakes\, and even a
  probable\, though transient\, ocean.
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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