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- W289559854 abstract "The mineralogy of local occurrences of fine-grained material, commonly called clay pods at the Sweetwater and Viburnum 29 mines in the viburnum Trend, has been investigated by petrographic, reflected light microscopic, XRD, SEM-EDS, and cathodoluminescence (CL) microscopic (CLM) techniques. Although the pods contain clay-size grains, only a small amount of illite is present. They are comprised principally of fine-grained sericite and adularia in an average of ratio of about 3:1. Sericite plates are 1--10 um in size, partially altered to illite, and locally observed by RLM and SEM to have formed prior to and be included within adularia. Adularia occurs as euhedral rhomb-shaped crystals, about 5 to 25 um across. CLM study has shown that about 60% of the adularia crystals, which are non-CL, contain cores of rounded, blue CL, detrital feldspar that was present as an insoluble residue from dissolution of the host Bonneterre Formation and that acted as a catalyst for adularia overgrowth deposition. This study has defined the paragenetic position of the potassic alteration to a narrow time period. It formed relatively late, during or after east-west faulting that is essentially perpendicular to the dominant trends of the orebodies, and during dissolution of earlier deposited octahedral galena.more » It formed prior to cubic galena, hydrothermal quartz, late chalcopyrite, late marcasite, and calcite, because sericite and/or adularia were observed to be included in those minerals. It coincides with a major period of sulfide dissolution.« less" @default.
- W289559854 created "2016-06-24" @default.
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- W289559854 date "1993-03-01" @default.
- W289559854 modified "2023-09-26" @default.
- W289559854 title "Mineralogy and paragenesis of potassic alteration associated with late copper and iron mineralization at the Sweetwater and Viburnum 29 mines in the Viburnum Trend, southeast Missouri" @default.
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