Shock induced vaporization of anhydrite CaSO[sub 4] and calcite CaCO[sub 3]

Gupta, Satish C.; Ahrens, Thomas J.; Yang, Wenbo
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p1259
Academic Journal
Discovery of abundant anhydrite (CaSO[SUP4]) and gypsum (CaSO[SUP4].2H[SUP2]O) in the otherwise carbonate sediments comprising the upper portion of the rocks contained within the Chicxulub impact crater has prompted research on the shock-induced vaporization of these minerals. We use a vaporization criterion determined by shock-induced entropy. We reanalyze the shock wave experiments of Yang [1]. He shocked 30% porous anhydrite and 46% porous calcite. Post-shock adiabatic expansion of the sample across a 5 mm-thick gap and then impact upon an aluminum witness plate backed by LiF window that is monitored with a VISAR. Reanalysis uses Herrman's P-α model [2] for porous materials, and a realistic interpolation gas equation-of-state for vaporization products. Derived values of the entropies for incipient and complete vaporization for anhydrite are 1.65±0.12 and 3.17±0.12 kJ(kg.K)[SUP-1], and for calcite these are 0.99±0.11 and 1.93±0.11 kJ(kg.K)[SUP-1]. Corresponding pressures for incipient and complete vaporization along the Hugoniot of non-porous anhydrite are 32.5 ±2.5 and 122±13 GPa and for non-porous calcite are 17.8 ±2.9 and 54.1±5.3 GPa, respectively. These pressures are a factor of 2-3 lower than reported earlier by Yang.


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