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Sharma, N.
- Geothermometry of the Granitoids of Eastern Higher Kumaun Himalaya, India
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Authors
Affiliations
1 Department of Geology, M.S.University of Baroda, Vadodara-390002, IN
2 Department of Geology, University of Delhi, Delhi-110007, IN
1 Department of Geology, M.S.University of Baroda, Vadodara-390002, IN
2 Department of Geology, University of Delhi, Delhi-110007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 53, No 2 (1999), Pagination: 211-217Abstract
The granitoids of eastern Higher Kumaun Himalaya show a metamorphic history extending from the Precambrian to Tertiary. The granitisation and formation of the granitoids within the Higher Himalaya were related to an early metamorphism (M1) that took place during Precambrian. Temperatures of the granitoids of eastern Higher Kumaun Himalaya are estimated based on co-existing feldspar pairs, alkali feldspar-muscovite geothermometer and Ti content in micas and are found to be in conformity with temperatures prevailing in the upper amphibolite facies.Keywords
Geothermometry, Metamorphism, Granitoids, Kumaun Himalaya.
- Characterization of Bauxite Deposits from Kachchh Area, Gujarat
Abstract Views :743 |
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Authors
Affiliations
1 Department of Earth Sciences, IIT Bombay, Powai, Mumbai - 400 076, IN
2 Department of Geology, M.S.University of Baroda, Vadodara - 390 002, IN
1 Department of Earth Sciences, IIT Bombay, Powai, Mumbai - 400 076, IN
2 Department of Geology, M.S.University of Baroda, Vadodara - 390 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 3 (2012), Pagination: 351-362Abstract
The bauxites deposits of Kachchh area in Gujarat are investigated to characterize them based on mineralogical and petrographic studies. The major bauxitic mineral in these occurrences is gibbsite, with minor concentration of boehmite and diaspore. Apart from the bauxitic minerals, the other associate minerals are kaolin, calcite, alunite and the iron ore minerals such as hematite and goethite and titanium rich anatase. The iron ore minerals (hematite and goethite) are 10-50microns in size and are disseminated throughout the oolitic and pisolitic bauxitic minerals. At places the goethite exhibits colloform texture. The preservation of basaltic texture in some of the samples indicate that the insitu nature of these bauxites, which are formed by the alteration of calcic plagioclase from the parent basalt. Although, the basalt occurs as the main parent rock for these bauxites, the presence of calcite in some of the samples represent the possibility of having a limestone parent rock at least in some of the bauxite occurrences.Keywords
Gibbsite, Boehmite, Diaspore, Alunite, Oolite, Pisolite, Colloform Texture, Kachchh, Gujarat.References
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