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Paleoenvironmnetal Reconstruction on Ancient Earth and Mars (SETI Talks)

SETI Institute

Tuesday, April 21, 2015 from 12:00 PM to 1:00 PM (PDT)

Paleoenvironmnetal Reconstruction on Ancient Earth and...

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Event Details

Tom Bristow, SETI Institute

Clay minerals often form at or near rocky planetary surfaces under low temperature hydrous conditions.  Careful identification of the types of clay minerals and consideration of their geological context can yield information on ancient environmental conditions, including inferences of atmospheric composition.  However, this task is complicated by multiple potential sources of clays and overprinting by subsequent diagenetic or hydrothermal processes.  Dr Bristow will discuss approaches to paleoenvironmental interpretation of clay mineral-bearing sedimentary rocks with a focus on recent findings from the Mars Science Laboratory (MSL) rover Curiosity.  MSL’s discovery of clay minerals in ancient lake sediments at Yellowknife Bay is critical evidence of habitable conditions in the past.  Determination of the origins of the clay minerals at Yellowknife Bay provides constraints on the longevity of aqueous conditions, redox state within sediments, and potential chemical energy sources for organisms.

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When & Where

SETI Institute
189 N Bernardo Ave
Mountain View, CA 94043

Tuesday, April 21, 2015 from 12:00 PM to 1:00 PM (PDT)

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SETI Institute

The mission of the SETI Institute is to explore, understand and explain the origin, nature and prevalence of life in the universe.

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