Geochemistry and origin of manganese-rich rocks related to iron-formation and sulfide deposits, western Georgia.
Wonder JD; Spry PG; Windom KE
Econ Geol 1988 Aug; 83(5):1070-1081
Base metal, gold deposits, and algoma-type iron formation in western Georgia were products of hydrothermal activity. The protoliths of coticule and garnet-bearing iron formation were hydrothermal sediments deposited on or very near sea-floor basalt in the vicinity of a hydrothermal vent and mixed with significant quantities, possibly >50 pct in the case of coticules, of pelagic or terrigenous sediments. The original sediments were probably ferromanganiferous cherts similar to those described by Crerar et al. From the franciscan assemblage, but the formation of garnet from a siliceous fe-mn sediment requires the presence of aluminous material (clay). The precursor fe-mn minerals were likely oxides, manganite, birnessite, todorokite, and goethite that form commonly in hydrothermal hot springs on the ocean floor. Models for the tectonic setting of the Appalachians remain controversial.
Metal-compounds; Metallic-compounds; Metallic-ions; Mineral-deposits; Minerals
OP; Final Contract Report; Journal Article
Iowa State University,g1164119