Volatile-and Siderophile-Element Depletion by Impact Processing of Chondritic Planetesimals

Details Volatile-and Siderophile-Element Depletion by Impact Processing of Chondritic Planetesimals Volatile-and Siderophile-Element Depletion by Impact Processing of Chondritic Planetesimals

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998lpico.957...28n&link_type=abstract

Origin of the Earth and Moon, Proceedings of the Conference held 1-3 December, 1998 in Monterey, California. LPI Contribution N

Astronomy and Astrophysics

Astrophysics

Chondrites, Geochemistry, Impact Melts, Meteoritic Composition, Planetary Evolution, Protoplanets, Meteorite Collisions, Silicates, Terrestrial Planets, Asteroid Collisions

Scientific paper

The L-chondrite parent body suffered a massive, possibly catastrophic impact event at about O.5 Ga, producing achondritic impact melt from achondritic precursor. We are investigating the geochemical consequences of this event in Chico, a 105-kg L chondrite composed of about 60% impact melt intruding host chondrite. The chondrite is shocked to stage S6. The melt is clast-poor and consists of fine-grained, euhedral olivines, pyroxenes, and interstitial glass. Metallic globules up to 2 cm in diameter are concentrated along the center of the dike, suggesting an early stage of metal-silicate immiscibility. Chico thus provides a natural laboratory in which to study the behavior of volatile and siderophile elements during impact melting of chondritic planetesimals. Depletion of volatile elements and metal-silicate fractionation are characteristic features of the terrestrial planets, so, conceivably, similar processes on larger scales may have influenced the composition of planetesimals during the early history of the solar system.

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