Impact-Induced Devolatilization and D/H Isotopic Fractionation of Serpentine-Metal Mixtures

Details Impact-Induced Devolatilization and D/H Isotopic Fractionation of Serpentine-Metal Mixtures Impact-Induced Devolatilization and D/H Isotopic Fractionation of Serpentine-Metal Mixtures

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1349t&link_type=abstract

Lunar and Planetary Science, volume 27, page 1349

Physics

Devolatilization, Fractionation: Isotope, Impacts, Serpentine, Shock

Scientific paper

Impact-induced devolatilization is a process fundamental to accretion. Impact velocities of infalling planetesimals increase in proportion to planetary radius. At some point in a planet's accretion history, minimum infall velocities will be sufficient to cause incipient devolatilization of incident planetesimals, thereby creating a planet's earliest proto-atmosphere. Reaction of shock released water with iron or iron sulfides will influence both primordial atmospheric development and core formation. Previous studies have examined impact-induced devolatilization in serpentine, carbonates, sulfates, and Murchison. Our earlier studies have established that for serpentine and Murchison, impact-induced devolatilization caused D:H fractionation between released gas and residual solid, with H being preferentially partitioned into the released gas. In this study, we have shocked serpentine-iron and serpentine-pyrrhotite mixtures to examine the influence of a metal phase on the impact-induced devolatilization and D/H isotopic fractionation of water driven from serpentine by shock. _

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