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Multiple origins of gahnite associated with hydrothermal alteration from the Bhuyari base metal prospect of Proterozoic Betul Belt, Madhya Pradesh
M.N. Praveen,
Published in
2007
Volume: 69
   
Issue: 2
Pages: 233 - 241
Abstract
Multiple origin of gahnite of different generations and their relationship with other coexisting minerals like garnet, biotite, chlorite and sphalerite were studied in metamorphosed synvolcanic hydrothermally altered rock associated with base metal mineralisation from the Proterozoic Bhuyari prospect, Betul Belt, Central India. The present assemblages appear to be the result of overprinting of amphibolite grade metamorphism on primary hydrothermal alteration products. Gahnite is found in a quartz + biotite + muscovite + plagioclase + gahnite + garnet + chlorite assemblage. Petrographic evidence with supporting mineral composition data suggests the presence of two generations of gahnite. The first generation gahnite is found surrounding sphalerite grains and may be the product of desulphidation of primary sphalerite involving first generation garnet. Second generation gahnite show petrographic evidence of transformation from biotite and might be the result of overstepping of the zinc saturation limit of biotite during alteration to chlorite. The Bhuyari area was subjected to one prograde event followed by a retrograde metamorphic event and mineral paragenesis is in conformity with the metamorphic history. © Geol. Soc. India.
About the journal
JournalJournal of the Geological Society of India
ISSN00167622