Microfabrics and Geochemistry of Meteorically Altered Dolomite in Devonian and Mississippian Carbonates, Montana and Idaho

摘要: Regional studies of Devonian and Mississippian carbonate sequences in Montana Idaho illustrate the ability meteoric water to alter early near-surface dolomite. Early precursor dolomites these rocks formed various settings, such as evaporitic tidal flats, shallow subsurface reflux environments, subtidal marine environments on broad platforms that extended across study area. The best preserved dolomites, or their remnants, typically are nonstoichiometric, isotopically heavy, trace element enriched. also generally predate compaction calcite cements exhibit zoned irregular cathodoluminescence (CL) patterns.