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The AAPG/Datapages Combined Publications Database

Journal of Petroleum Geology

Abstract

Journal of Petroleum Geology, Vol.10, No.1, pp. 73-86, 1987

┬ęCopyright 2000 Scientific Press, Ltd.

PETROLOGY AND KINETICS OF GYPSUM -- Previous HitANHYDRITENext Hit TRANSITIONS

S. M. Billo*

* Geology Dept., King Saud University, Ad-Dir'yah, Riyadh, Saudi Arabia.


Abstract

Despite suggestions by some workers that most, if not all, the calcium sulphate in natural evaporites was originally deposited as gypsum, controversy concerning the origin of Previous HitanhydriteNext Hit has arisen, both because bedded Previous HitanhydriteNext Hit is common throughout much of the geologic record, and also as a result of the discovery of the recent Previous HitanhydriteNext Hit formations in the UAE, Persian/Arabian Gulf, and other areas. In addition, an inability to synthesize Previous HitanhydriteNext Hit in the laboratory under geologically reasonable conditions has caused the reliability of previous experimental methods to be doubted. However, new evidence from studies of chemical kinetics indicates that supersaturation and surface energies in the CaSO4--H2O system may regulate primary Previous HitanhydriteNext Hit precipitation. Arguments for and against the universality of gypsum as the sole origin of Previous HitanhydriteTop are here related to specific facts and relevant observations from the fields of petrology, geology, and geochemistry.

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