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- W1607029367 abstract "Burial dolomitization of platform carbonates is often attributed to fluids derived from shale basins. This study focuses on the application of geochemistry to trace the direction of fluid flow and hypothesize about fluid source(s) during burial diagenesis of the Maryville Limestone. Petrographic analyses along a depositional transect from platform-margin to basin reveals that dolomite is the principal burial diagenetic phase. The authors have identified four different generations of dolomite based on petrographic and geochemical analyses. Type 1 dolomite occurs as irregular disseminations typically within mud rich facies. Type 2 dolomite typically occurs as inclusions of planar-euhedral rhombs (ferroan) 5 to 300 [mu] size in blocky clear ferroan calcite (meteoric) spar. Type 2 dolomite consists of non-luminescent rhombs under cathodoluminescence. Type 1 and 2 dolomites are interpreted to have formed during shallow-intermediate burial diagenesis. Type 3 dolomite consists of subhedral to anhedral crystals of approximately 10 [mu] to 150 [mu] size. It occurs as thin seams along stylolites and as thick bands measuring a few mm. Under cathodoluminescence the crystals are dominantly non-luminescent and less commonly show orange luminescence and zoning. Type 4 dolomite is baroque or saddle dolomite that occurs as non-luminescent, subhedral to anhedral crystals 100--1,500 [mu] size. Typemore » 4 dolomite probably formed during maximum burial. Based on the Fe and Mn distributions in saddle dolomite, the authors propose a west-east fluid flow during late burial diagenesis. Depleted oxygen isotope compositions suggests that the fluids were warm. Presence of saddle dolomite confirms this conclusion. Similar Sr-isotope compositions for Type 3 and Type 4 dolomite suggest that they formed from fluid of similar composition. Finally enriched Sr-isotope ratio is consistent with a siliciclastic source for the fluids during deep burial.« less" @default.
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- W1607029367 date "1992-01-01" @default.
- W1607029367 modified "2023-09-27" @default.
- W1607029367 title "Petrographic and geochemical constraints for fluid source and possible pathways during burial diagenesis of Maryville Limestone (M. Cambrian) southern Appalachians" @default.
- W1607029367 hasPublicationYear "1992" @default.
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