High-Temperature Vaporization of Mg-Ca-Carbonate-Sulfate-Quartz-Alumina Targets

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Carbon: Trapping, Condensates, Impacts: Simulation, Sulfur: Trapping, Vaporization

Scientific paper

In a series of experiments we studied the chemistry of high-temperature vaporization in the Ca-carbonate-sulfate-quartz system in relation to the Chicxulub impact. Since Mg-carbonates are a major constituent of the rocks in the Chicxulub crater area, it is important to study the evaporative chemistry of MgCO3 together with the cited system. We performed high-temperature vaporization of MgCO3 + CaCO3 + CaSO4/CaSO4 x 2H2O + SiO2 (in one experiment we used anhydrite and in another gypsum) targets using standard laser-pulse heating technique to simulate impact vaporization. In the third experimental run we added Al2O3 to simulate the alumo-silicate component of Chicxulub target rocks and to investigate the behavior of Al during vaporization. The results show a complex chemistry which occurs in the vapor cloud, resulting in (1) noticeable trapping of S, C, and of H2O by condensing products; (2) formation of Mg and Al sheet silicates in experiments with water-containing targets; and (3) strong reduction processes in experiments with water-containing targets.

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