Events

Friday, September 11, 2015 - 12:00pm
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Haller Hall (Room 102), Geological Museum, 24 Oxford Street, Cambridge

Geochemistry and Cosmochemistry Special Seminar

Pierre Haenecour, NASA Earth and Space Science Fellow, Washington University in St. Louis, presents "From Stars to the Laboratory: Presolar Silicates in the Solar System.” Presented by The Department of Earth and Planetary Sciences, Harvard University. 

Abstract: Presolar silicates survived the formation of the solar system and can be found today in the most primitive extraterrestrial materials. These grains formed in stellar outflows or ejecta, outside the solar system. Since their first discovery about a decade ago, close to a thousand presolar silicate grains have been identified in primitive extraterrestrial materials. The characterization of the isotopic and elemental compositions of presolar grains opened a new field in Astronomy and Astrophysics, allowing the in-situ study individual stars and providing ground-truth information on nucleosynthetic processes and grain condensation in circumstellar envelopes. More recently, presolar silicates have also been used as possible tracers of alteration processes (heating or aqueous alteration) in the early solar system history. I will introduce presolar silicates and present two examples presolar silicate abundance as tracers of aqueous alteration.

Contact Name: 

Kun Wang

Research Areas: 

Harvard University
Center for the Environment

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