Geothermometry of ultramafic rocks around Terakanambi, southern Karnataka

Shadakshara, S.N. and Manjunatha, R.B. (1989) Geothermometry of ultramafic rocks around Terakanambi, southern Karnataka. Current Science, 58 (9). pp. 494-495. ISSN 0011-3891

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Ultramafic rocks (UR) from the Tarakanambi area (India) are assocd. with trondhjemitic gneisses, belites, amphibolites, etc. The UR include gabbroic anorthosites, and form a layered complex. Based on their mineral assocns., 6 groups of UR are recognized. Orthopyroxenes in these UR are enstatite, with a relatively high Al content. The clinopyroxene is diopsidic, with total Al 0.068 atom​/formula unit. The pale green coloration of hornblende is due to the low (0.95​%) TiO2 content; it is a magnesio-​hornblende. Temp. calcns. using the model proposed by P.R.A. Wells (1977) for the pyroxene pains from the UR yielded a value of 690°. This metamorphic temp. of 690° for the UR indicates imprints of upper amphibolite-​facies metamorphism

Item Type: Article
Subjects: Faculty of Science > Earth Sciences > Geology
Divisions: Jnana Bharathi / Central College Campus > Department of Geology
Depositing User: Ms. Rekha Jadhav
Date Deposited: 27 Sep 2016 09:28
Last Modified: 27 Sep 2016 09:28

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