Mineral chemistry of hornblendes from the charnockites of Karnataka, India

Mahabaleswar, B. and Vasant Kumar, I.R. (1983) Mineral chemistry of hornblendes from the charnockites of Karnataka, India. Acta Mineralogica-Petrographica, 26 (1). pp. 115-123. ISSN 0365-8066

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Abstract

The mineral geochem. was studied of the Ca amphiboles in the charnockites of Karnataka. The majority of the analyzed amphiboles occur within a narrow range of the Fetotal/(Fetotal + Mg) values. The minerals show all the chem. characteristics of high-​Al2O3, high-​Ti, and alkali hornblendes from other granulite-​facies areas. According to the nomenclature of B. E. Leake (1978)​, they are ferroan pargasitic hornblende [95725-​82-​9]​. The variation of the Si-​Al in the samples is due to a combination of independent parameters, namely pressure, temp. of metamorphic crystn., and O2 fugacity. The AlIV and AlVI relation in the hornblendes is a function of Ti substitution.

Item Type: Article
Subjects: Faculty of Science > Earth Sciences > Geology
Divisions: Jnana Bharathi / Central College Campus > Department of Geology
Depositing User: Mr . Chandrashekar
Date Deposited: 20 Sep 2016 07:22
Last Modified: 20 Sep 2016 07:22
URI: http://eprints-bangaloreuniversity.in/id/eprint/5851

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