Regional Epigenetic Dolomitization in the Bonneterre Dolomite (Cambrian), Southeastern Missouri
A dolomite bed averaging 6 m in thickness forms the base of a limestone and shale facies of the Bonneterre Dolomite (Cambrian), southeastern Missouri. It is proposed that this basal dolomite formed as a result of interaction with warm, basin-derived water circulating through the underlying Lamotte Sandstone, and that the dolomitization event coincided with the emplacement of Mississippi Valley-type sulfide ores in the nearby Viburnum Trend. This hypothesis is supported by (1) petrographic evidence that suggests an origin at temperatures > 50°C, (2) cathodoluminescent microstratigraphy of dolimite cements which is correlative with that in gangue dolomite cements in the nearby orebodies, and (3) stable oxygen and carbon isotope values that are consistent with a basinal origin of the dolimitizing water. The basal dolomite bed may represent one of the most extensive epigenetic dolomites yet documented. This implies that a basinal water can alter rocks over a wide area at a considerable distance from its source.
J. M. Gregg, "Regional Epigenetic Dolomitization in the Bonneterre Dolomite (Cambrian), Southeastern Missouri," Geology, vol. 13, no. 7, pp. 503-506, Geological Society of America (GSA), Jul 1985.
The definitive version is available at http://dx.doi.org/10.1130/0091-7613(1985)13<503:REDITB>2.0.CO;2
Geosciences and Geological and Petroleum Engineering
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© 1985 Geological Society of America (GSA), All rights reserved.