Impact-induced devolatilization of CaSO4 anhydrite and implications for K-T extinctions: Preliminary results

Details Impact-induced devolatilization of CaSO4 anhydrite and implications for K-T extinctions: Preliminary results Impact-induced devolatilization of CaSO4 anhydrite and implications for K-T extinctions: Preliminary results

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24.1449t&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z p 1449-1450 (SEE N94-20636 05-91

Mathematics

Logic

Bolides, Decomposition, Gypsum, Impact, Sulfates, Volatility, Aerosols, Gas Composition, Minerals, Stainless Steels, Thermodynamics

Scientific paper

The recent suggestions that the target area for the K-T bolide may have been a sulfate-rich evaporite and that the resulting sulfuric acid-rich aerosol was responsible for the subsequent cooling of the Earth and the resulting biological extinctions has prompted us to experimentally examine the impact-induced devolatization of the sulfate minerals anhydrite (CaSO4) and gypsum (CaSO4(2H2O)). Preliminary results for anhydrite are reported. Up to 42 GPa peak shock pressure, little or no devolatilization occurs, consistent with chemical thermodynamic calculations. Calculation of the influence of the partial pressure of the gas species on impact-induced devolatilization suggests that an even greater amount of sulfur than that proposed by Brett could have been released to the atmosphere by an impact into a sulfate-rich layer. Solid recovery, impact-induced devolatilization experiments were performed on the Caltech 20mm gun using vented, stainless steel sample assemblies.

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