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- W168922534 abstract "Filled sinks were Middle Pennsylvanian surface-solution sinkholes developed on Cambrian and Ordovician carbonates. As sea level fell they continued to deepen and fill, their contents leached and desilicated by organic-acid-rich waters. Today they contain white and hematitic kaolinite and aluminum oxides (flint clays), massive iron sulfides, and some iron oxides. Ba-, Cu-, U-, P-, and Sr-bearing minerals have been reported in them. Several lines of evidence point to alteration of sink-fill contents by later fluids. Some, generally white, flint clays contain pockets of cookeite-like dioctahedral chlorite with > 5,000 ppm Li in whole-rock samples. Chlorite coats (postdates) kaolinite plates, which are corroded in areas. O/D isotopic data from filled-sink kaolinites, chlorites, and mixtures thereof, fall to the high-temperature side of values expected for low-temperature formation of kaolinite. Hematite in breccia fragments and cement at the base of a clay-filled sink shows close grouping of remanent magnetizations, indicating postdepositional chemical alteration. More southerly iron sulfide-filled sinks have [delta][sup 34]S signatures of +8 to [minus]14, similar to those of MVT deposits of similar stratigraphic horizon. Farther north, some hematitic flint clays were bleached white as warm reducing, MVT-related fluids rose toward the surface through the bottoms of those sinks. There the fluids'more » pH increased through the hydrolysis of kaolinite, and temperature decreased. Lithium, derived via contact with underlying St. Francois granite-rhyolite terrane, was incorporated into an epithermal dioctahedral chlorite that formed from the dissolution of karstic kaolinite and boehmite.« less" @default.
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- W168922534 date "1993-03-01" @default.
- W168922534 modified "2023-09-28" @default.
- W168922534 title "MVT fluids altered filled-sink deposits of the Ozark uplift" @default.
- W168922534 hasPublicationYear "1993" @default.
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