Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

K. S. Balasubramaniam ¹, V. Panchapakesan ¹, K. C. Sahu ¹

Affiliations
1 Indian Institute of Technology, Bombay, IN

Abstract

The homogenisation studies of gas-liquid fluid inclusions in fluorites from Handev Dongar-Ambadongar (Gujarat) and Kahela-Mandokipal (Rajasthan) carried out with a fabricated heating stage corroborates the earlier view that both the deposits are typically of a low hydrothermal origin.

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K. S. Balasubramaniam ¹, J. S. Bhosale ¹

Affiliations
1 Geology Section, Indian Institute of TechnoIogy, Bombay 400 076, IN

Abstract

Fluorite occurs as replacement and cavity filling type in a shear zone traversing the Dongargarh granites where basic rocks' are encountered. This region is different in two ways: 1. presence of basic rocks in the shear zone and 2. absence of any calcareous type of rocks as compared to other fluorite occurrences like Ambadongar in Gujarat and Kahela-Mandokipal in Rajasthan. Fluorite, tysonite, borofluorite and yittrofluorite are the minerals identified. Geochemical studies combined with thermodynamic data throw a better light on the genesis of the fluorite deposits of this area which can be classified as low temperature hydrothermal.

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K. S. Balasubramaniam ¹, A. L. Paropkari ², R. Nagarajan ¹

Affiliations
1 Geology Section, Indian Institute of Technology, Bombay 400076, IN
2 National Institute of Oceanography, Goa, IN

Abstract

Laboratory studies of three bauxitic profiles from Maharashtra and Tamil Nadu suggest that plagioclase feldspar alters to gibbsite via halloysite and not from kaolinite. The alteration characteristics of feldspars and the morphological aspects of clays leading to the genesis of bauxites were studied under electron microscope.

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