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Pyroxene-garnet granulite from Koppal, raichur district, mysore state

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Proceedings / Indian Academy of Sciences

Abstract

The results of the investigation carried out on pyroxene-garnet granulite which is closely associated with quartzite and ferruginous quartzite in the granitic rocks of Koppal area, Raichur District, Mysore State, have been described and discussed. Optical and chemical studies of light green pyroxene and pale pink garnet suggest that the clinopyroxene is ferrosalite with Tsch17Jd3Hd50Di30 (Yoder and Tilley, 1963) and the garnet is almandine rich with Alm72 Sp12 Py8 Gro8. On the basis of the distribution coefficient of Fe+2 and Mg+2 in co-existing pyroxene and garnet it has been concluded that the present mineral assemblage of the granulite is possibly due to regional metamorphism of ferruginous shale rich in lime, under conditions intermediate between glaucophane schist and granulite facies. Evidences are given in support of this conclusion.

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Authors and Affiliations

  1. Departmeat of geology, Karnatak University, Dharwar-3

    S. M. Appanagoudar

Authors
  1. M. S. Sadashivaiah
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  2. S. M. Appanagoudar
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Additional information

Communicated by Dr. B. P. Radhakrishna,f.a.sc.

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Sadashivaiah, M.S., Appanagoudar, S.M. Pyroxene-garnet granulite from Koppal, raichur district, mysore state. Proc. Indian Acad. Sci. 76, 194–200 (1972). https://doi.org/10.1007/BF03051316

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  • DOI: https://doi.org/10.1007/BF03051316

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