The South Kolar Greenstone Belt (SKGB) which is the southern extension of the main Kolar belt hosts several gold deposits and prospects. Among them Chigargunta (CG) and Bisanatham (BN) deposits are most significant deposits. Excluding the western lode of CG which is within the mafic volcanic rocks, majority of the auriferous lodes are hosted in the felsic volcanics (Champion Gneiss) that forms the main eastern mineralization system. In BN, mineralisation is hosted mainly within mafic volcanic rocks that are in closer proximity with Bisanatham granite. Different litho-association has certainly impacted in the development of distinct alteration zones which are mineralogically different in each of these prospects. Three distinct alteration zones with specific mineral assemblages were reported in CG and, at least two zones were identified in BN. The present study focuses on alteration mineralogy and its changes within the alteration zones to characterize the hydrothermal alterations of two distinct gold hosting rocks, in terms of mineralogy and mineral chemistry, in SKGB.
Characterization of Hydrothermal Alteration at Chigargunta and Bisanatham Gold Deposits, South Kolar Greenstone Belt, Dharwar Craton, India
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The South Kolar Greenstone Belt (SKGB) which is the southern extension of the main Kolar belt hosts several gold deposits and prospects. Among them Chigargunta (CG) and Bisanatham (BN) deposits are most significant deposits. Excluding the western lode of CG which is within the mafic volcanic rocks, majority of the auriferous lodes are hosted in the felsic volcanics (Champion Gneiss) that forms the main eastern mineralization system. In BN, mineralisation is hosted mainly within mafic volcanic rocks that are in closer proximity with Bisanatham granite. Different litho-association has certainly impacted in the development of distinct alteration zones which are mineralogically different in each of these prospects. Three distinct alteration zones with specific mineral assemblages were reported in CG and, at least two zones were identified in BN. The present study focuses on alteration mineralogy and its changes within the alteration zones to characterize the hydrothermal alterations of two distinct gold hosting rocks, in terms of mineralogy and mineral chemistry, in SKGB.
Publication Mode |
Online |
---|---|
Publication Author |
Debasis Pal, Sakthi Saravanan Chinnasamy, Swapnendu Goon |
Publication Language |
English |
Publication Type |
Conference Paper |
Publication Year |
2021 |
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