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Geochemistry and origin of manganese-rich rocks related to iron-formation and sulfide deposits, western Georgia.

Authors
Wonder-JD; Spry-PG; Windom-KE
Source
Econ Geol 1988 Aug; 83(5):1070-1081
NIOSHTIC No.
10007740
Abstract
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.
Keywords
Metal-compounds; Metallic-compounds; Metallic-ions; Mineral-deposits; Minerals
CODEN
ECGLAL
Publication Date
19880801
Document Type
OP; Final Contract Report; Journal Article
Fiscal Year
1988
NTIS Accession No.
NTIS Price
Identifying No.
MIR 20-90
Issue of Publication
5
ISSN
0361-0128
NIOSH Division
WO
Source Name
Economic Geology
State
GA; IA
Performing Organization
Iowa State University,g1164119
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