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.
Mississippian Non-Supratidal Dolomite, Ste. Genevieve Limestone, Illinois Basin: Evidence for Mixed-Water Dolomitization
Published:January 01, 1980
Philip W. Choquette, Randolph P. Steinen, 1980. "Mississippian Non-Supratidal Dolomite, Ste. Genevieve Limestone, Illinois Basin: Evidence for Mixed-Water Dolomitization", Concepts and Models of Dolomitization, Donald H. Zenger, John B. Dunham, Raymond L. Ethington
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In a 140 km2 subsurface area along the La Salle anticline, southeastern Illinois, a 5–12 m sequence of shaUow-marine, subtidal lime mudstone and wackestone in the upper Ste. Genevieve Limestone (Meramecian) has been altered in pa?chy fashion to porous (25–40%), oil-productive, microcrystalline dolomite. Information from about 150 wells (46 cored) shows the dolomite to occur in lens-shaped bodies up to 12 m (38 ft) thick, 0.5–2.5 km (0.3–1.5 mi) across by 1–5 km (0.6–3 mi) long, in places probably interconnected, and strongly oriented E-W to NE-SW. The dolomite interfingers with lime mudstone/wackestone, which it closely resembles in primary...