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Baskar, Ramanathan
- Alkali Amphiboles and Pyroxenes from Siwana Granite and the Associated Acid Volcanics, Rajasthan
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Authors
Affiliations
1 Department of Environmental Sciences & Engineering, Guru Jambheshwar University, Hisar 125 001, IN
2 Department of Geology, Panjab University, Chandigarh 160 014, IN
1 Department of Environmental Sciences & Engineering, Guru Jambheshwar University, Hisar 125 001, IN
2 Department of Geology, Panjab University, Chandigarh 160 014, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 4 (2005), Pagination: 427-437Abstract
Compositional characteristics and substritutional schemes of the amphiboles and pyroxenes of the alkali granites and the associated volcanics around Goliya Bhaylan area are studied. In the alkali granite, the amphiboles evolve from ritchterite to arfvedsonite, in trachytes from winchite to riebeckite and in the case of rhyolites from ritchterite through arfvedsonite to riebeckite with dominant substitution of the type NaM4 +R3+ for Ca + R2+. The pyroxenes in alkali granite evolve from hedenbergite to degirine through Aegirine-Augite representing the acmitic hedenbergite trend with dominant NaFe3+= Ca(Mg,Fe)2+substitution and a minor amount of NaAl = CaFe2+substitution , whereas the pyroxenes in the acid volcanics are aegirine representing the acmitic trend, with the same substitution characteristics as those found in the alkali granites. The occurrence of TI aegrine and aenigmatite is also reported. The chemical trends of the pyroxenes and amphiboles indicate that they are formed from a highly evolved peralkaline residual melt.Keywords
Pyroxenes, Amphiboles, Peralkaline, Alkali Granite, Siwana, Rajasthan.
- Calcite Precipitation by Rhodococcus sp. Isolated from Kotumsar Cave, Chhattisgarh, India
Abstract Views :253 |
PDF Views:93
Authors
Affiliations
1 Environmental Studies, School of Interdisciplinary and Transdisciplinary Studies, Indira Gandhi National Open University, New Delhi 110 068, IN
2 Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology, Hisar 125 001, IN
1 Environmental Studies, School of Interdisciplinary and Transdisciplinary Studies, Indira Gandhi National Open University, New Delhi 110 068, IN
2 Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology, Hisar 125 001, IN
Source
Current Science, Vol 114, No 05 (2018), Pagination: 1063-1074Abstract
The precipitation of carbonate minerals by Rhodococcus sp. strain S14 isolated from Kotumsar cave, Chhattisgarh, India is reported. The speleothems at Kotumsar showed high microbial cell enumeration on B4 agar; iron agar (3.4 x 105 CFU/g) and sulphite agar (7.2 x 102 CFU/g). National Centre for Biotechnology Information database was used for the BLASTn sequence search of 16S rRNA sequences. The S14 strain gave similarity scores of ≥99% with the respective organisms on the database. The strain was identified as Rhodococcus sp. Culture experiments performed using the isolated strains suggested that the rate of precipitation was dependent on pH, temperature and bacterial growth. Rhodococcus sp. S14 strain induced the formation of calcite in vitro and the biominerals produced were calcified spherulites with pores (as imaged with SEM). The precipitate, at the end of the experimental period of 35 days, had the appearance of coccoliths. This is the initial report on the possible involvement of Rhodococcus sp. in the precipitation of carbonates at Kotumsar cave.Keywords
Biocalcification, Cave Geomicrobiology, Precipitation, Rhodococcus sp.Full Text
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