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Geochemistry and origin of gold mineralization in the Kolar Schist BeltGeological, mineralogical, mineral-textural and geochemical data of the sulfide lodes in the belt indicate that the gold mineralization could be related to low temperature, low Eh and high pH rock-dominated geothermal systems set up in the submarine volcanic pile prior to amphibolite metamorphism. A relatively long-lived geothermal system produced an economic deposit, whereas short-lived ones, because of rapid burial by younger basalts throttled the geothermal system and diffused the discharge yielding low grade ore bodies. The source for gold and iron could be iron enriched tholeiites derived from source regions enriched in komatiitic melt components and komatiitic rocks derived by very low extents of melting of metasomatised mantle sources. On the other hand, the geographical restriction of the quartz-calcite lodes, their mineralogical and geochemical data and their estimated temperature of formation all seem to suggest that a major part of the hydrothermal fluids, and a significant portion of gold could have been derived from mantle derived intrusive, sanukitoid type magma sources, similar to the Champion Gneiss occurring on the eastern part of the belt. However, the possibility of some input by remobilization of a premetamorphic sulfide protore to quartz lodes cannot be ruled out completely.
Document ID
19890012880
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Siddaiah, N. Siva (Jawaharlal Nehru Univ. New Delhi, India)
Rajamani, V. (Jawaharlal Nehru Univ. New Delhi, India)
Date Acquired
September 5, 2013
Publication Date
January 1, 1988
Publication Information
Publication: Lunar and Planetary Inst., Workshop on the Deep Contiental Crust of South India
Subject Category
Geophysics
Accession Number
89N22251
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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