Criteria for the Recognition of Diverse Dolomite Types with an Emphasis on Studies on Host Rocks for Mississippi Valley-Type Ore Deposits
Published:January 01, 1980
Frank W. Beales, Jenna L. Hardy, 1980. "Criteria for the Recognition of Diverse Dolomite Types with an Emphasis on Studies on Host Rocks for Mississippi Valley-Type Ore Deposits", Concepts and Models of Dolomitization, Donald H. Zenger, John B. Dunham, Raymond L. Ethington
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Dolomites are the favored host rocks for low-temperature lead /zinc ore deposits, probably because many dolomites have formed in evaporitic environments. Association with a local sulfur source probably enhanced the chances of ore formation. Reduction of sulfate in the presence of organic matter such as gas or oil is the most likely intermediate step. If so, the presence of sulfide ores in apparently sulfate-free dolomites may indicate a former sulfate abundance. Ore bodies are commonly associated with solution-collapse breccias, which are often attributed to evaporite solution. The nearly complete subsequent removal of the evaporites makes this difficult to prove,...
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Concepts and Models of Dolomitization
Special Publication 28 has its roots in the 22nd Annual Research Symposium of SEPM entitled Concepts and Models of Dolomitization – Their Intricacies and Significance held on April 3,1979 in Houston, Texas as part of the joint annual meetings of AAPG and SEPM. The purpose of that symposium was to express the state-of-the-art of the study of the elusive process(es) of dolomitization. Most of the contributions in this volume are concerned with apparent early, nearsurface dolomitization, either by hypersaline brines, by the marine-meteoric mixing model or some variant thereof, or by both mechanisms where more than one phase or kind of dolomite exists, or where the origin of a particular dolomite is uncertain. Other models and aspects of dolomitization are treated here as well.