Genesis and evolution of the ore deposits in the early Precambrian greenstone belts and adjacent high grade metamorphic terrains of Peninsular India — A study in similarity and contrast
作者： S.C. Sarkar
DOI: 10.1016/0301-9268(88)90054-X
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摘要: Abstract Karnataka and the adjacent areas of Tamil Nadu Andhra Pradesh in Peninsular India are characterized by sublinear ‘greenstone belts’ set a tonalite-trondhjemite dominated gneissic terrain (mainly 3400-3000 Ma) skirted high grade metamorphic (amphibolite-granulite facies) belt south east. The greenstone belts divided into sedimentary-volcanic Sargur-Holenarsipur-Nuggihalli type (> 3000 Ma), volcanic-dominated Kolar-Ramagiri-Hutti (⩾ sediment-dominated Dharwar (3000-2600 arranged order increasing areal coverage. granulite facies metamorphism Gneiss associated supracrustals took place 2500–2600 Ma ago. first is poor ore content. These contain few lean base metal deposits, chromite deposits Ti- V-bearing magnetite places. Locally banded also present. second known for its Au belt, course, contains rich Fe Mn rare small Cu. Ore deposition as Sargur belt. Whatever metallizations occur there confined to supracrustal enclaves. Differential metallization different segments explained terms differential development crust, atmosphere biosphere.
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