Recognition of Primary Facies Characteristics of Evaporites and The Differentiation of These Forms from Diagenetic Overprints
B. Charlotte Schreiber, Mark S. Roth, Marc L. Helman, 1982. "Recognition of Primary Facies Characteristics of Evaporites and The Differentiation of These Forms from Diagenetic Overprints", Depositional and Diagenetic Spectra of Evaporites - A Core Workshop, C. Robertson Handford, Robert G. Loucks, Graham R. Davies
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Over the past fifteen years a great deal of information has been gained concerning evaporites, such that it is now possible to examine core and outcrop material in order to accurately work out the environ-ment(s) of deposition and some of the subsequent diagenetic history. It must be admitted that because of postdepositional alteration many cores or outcrops convey little information save the presence or absence of one or another mineral phase. In these cases, inferences as to the condition of origin must be made through a veil of obfuscation. Simple processes, such as burial with attendant compaction and loss of water of crystallization due to modest geothermal heating, can result in rocks which look superficially similar to those produced as the primary facies of a different origin. Subtleties within the rock record may reveal clues important in unraveling features of primary deposition, as opposed to later diagenesis.
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Geologists do not often have an opportunity to examine evaporites, whether in outcrops as badly weathered exposures, or in the subsurface, where evaporites are not as frequently cored as other rock types. Nevertheless, evaporites are important economically (mineral resource, seals for hydrocarbons, disposal sites for radioactive wastes, etc.) and geologists are, by necessity, becoming more aware of their origins. This workshop is intended to increase awareness and provide useful information for comparison to other evaporites, all of which should eventually benefit geologists in their efforts to understand the depositional and diagenetic spectra of evaporites.