CfA Colloquium Schedule Fall 2013
 21 November 2013

21 November 2013

Speaker: Ben Weiss (MIT)

Title:Differentiated Planetesimals and the Parent Bodies of Meteorites

Abstract: Meteorites are samples of dozens of small planetary bodies that formed in the early solar system. They exhibit great petrologic diversity, ranging from primordial accretional aggregates (chondrites) to once fully molten magmas (achondrites). It has long been thought that no single parent body could be the source of more than one of these three meteorite lithologies. Our magnetic measurements of meteorites, combined with a diversity of other observations, suggest that some chondrites could in fact be samples of the outer, unmelted crusts of otherwise differentiated planetesimals with silicate mantles and metallic cores. This may have major implications for the origin of meteorite groups, the rates and onset times of accretion, mass and momentum transfer in the protoplanetary disk, and the interior structures and histories of asteroids.


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