Chemistry of calcic amphiboles from the area around Terakanambi, southern Karnataka

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Shadakshara Swamy, N. and Mahabaleswar, B. (1988) Chemistry of calcic amphiboles from the area around Terakanambi, southern Karnataka. Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences, 97 (1). pp. 1-10. ISSN 0973-774X

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Official URL: https://doi.org/10.1007/BF02861622

Abstract

Chemial analyses of twelve amphiboles from the area around Terakanambi are presented. Results indicate that they are ferro-hornblende and ferro-pargasitic hornblende types in banded iron formations; magnesio hornblende in ultramafic rocks and edenite; and ferroan pargasite and ferroan pargasitic hornblende types in calcamphibolites. Titanium content in the amphiboles of the present study is relatively low compared to results from similar zones elsewhere. The lower titanium content of the amphiboles may be attributed to either bulk chemical composition or to low oxygen fugacity. Mg/Fe ratios vary considerably and it is mainly controlled by host rock composition. The plots of calcic amphiboles on (lOONa/Ca + Na)/(100 Al/Si + Al) and Aliv/Alvi diagrams indicate that they are of medium to low pressure type. © 1988 Indian Academy of Sciences.

Item Type: Article
Additional Information: cited By 2
Uncontrolled Keywords: Calcic amphiboles Terakanambi high grade terrain chemical analyses
Subjects: Faculty of Science > Earth Sciences > Geology
Divisions: Jnana Bharathi / Central College Campus > Department of Geology
Depositing User: Mr. Kirana Kumar D
Date Deposited: 01 Feb 2016 06:47
Last Modified: 27 Feb 2016 08:36
URI: http://eprints-bangaloreuniversity.in/id/eprint/351

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