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The charnockite series of Amaravathi, Gunter District, Andhra Pradesh, South India

Published online by Cambridge University Press:  01 May 2009

A. Ramaswamy  and
M. S. Murty
A. Ramaswamy
Affiliation:
Department of Geology, S. V. University, Titupati, South India
M. S. Murty
Affiliation:
Department of Geology, S. V. University, Titupati, South India
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Summary

The charnockite series consisting of pyroxene granulites and charnockites are not formed by magmatic differentiation, although both units had their antecedents in igneous material. The solid-state recrystallization of pyroxene granulite and the liquid-state crystallization of charnockite are inferred from the field criteria. The pyroxene granulites with the associated paragneisses are formed from the original sedimentary-volcanic sequence under granulite facies of metamorphism. The magmatic charnockites emplaced into these rocks resulting in the development of intermediate varieties by the partial assimilation and incorporation of the pyroxene granulites. The stability of the minerals is not affected by this migmatization, which is therefore thought to have taken place under granulite facies conditions. The evolutionary trend of the charnockite series is one of retrogression from the earlier granulite facies to the later almandine-amphibolite facies, caused by the subsequent granite invasion.

Type
Articles
Information
Geological Magazine , Volume 110 , Issue 2 , March 1973 , pp. 171 - 184
Copyright
Copyright © Cambridge University Press 1973

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References

Barth, T. F. W. 1952. Theoretical Petrology. John Wiley & Sons, Inc., New York, 387 pp.Google Scholar
Cooray, P. G. 1962. Charnockites and their associated gneisses in the Pre-Cambrian of Ceylon. Q. Jl geol. Soc. Lond. 118, 239–73.CrossRefGoogle Scholar
Cooray, P. G. 1969. Charnockites as metamorphic rocks. Am. J. Sci. 267, 969–82.CrossRefGoogle Scholar
Eskola, P. 1957. On the mineral facies of Charnockites. J. Madras Univ. B.27, 101–19.Google Scholar
Fyfe, W. S., Turner, F. J. & Verhoogen, J. 1958. Metamorphic reactions and metamorphic facies. Mem. geol. Soc. Am. 73.Google Scholar
Holland, T. H. 1900. The charnockite series, a group of Archean hypersthene rocks in peninsular India. Mem. geol. Surv. India 28, 119–249.Google Scholar
Howie, R. A. 1955. The geochemistry of the charnockite series of Madras, India Trans. R. Soc. of Edinb. 62, 725–68.CrossRefGoogle Scholar
Howie, R. A. 1964. Geology. Sci. prog. 52, 208, 628–43.Google Scholar
Larsen, E. S. Jr. 1938. Some new variation diagrams for groups of igneous rocks. J. Geol. 46, 505.CrossRefGoogle Scholar
Leake, B. E. 1964. The chemical distinction between ortho- and para-amphibolites Jour. Petrology 5, 238–54.CrossRefGoogle Scholar
Leake, B. E. 1969. The discrimination of ortho- and para-charnockitic rocks, anorthosites and amphibolites. Ind. Min. 10, 89–104.Google Scholar
Michot, P. 1951. Essai sur la géologic de la catozone. Acad. Royale de Belgique. Bull. classe des scil. 37, 5th ser., 271–2.Google Scholar
Nockolds, S. R. 1954. Average chemical composition of some igneous rocks. Bull. geol. Soc. Am. 65, 1007–32.CrossRefGoogle Scholar
Oliver, R. L. 1964. Note on some garnetiferous rocks from Ceylon. XXII Int. geol. Cong. 13, 59–78.Google Scholar
Parras, K. 1958. On the charnockites in the light of a highly metamorphic rock complex in Southwestern Finland. Geologinen Tulkimuslatos. Bull. Comm. Geol. Finlande 18.Google Scholar
Pichamuthu, C. S. 1953. The charnockite problem. Mysore Geol. Ass. India, 178 pp.Google Scholar
Prider, R. T. 1945. Charnockite and related cordierite-bearing rocks from Dangin, Western Australia. Geol. Mag. 82, 145–73.CrossRefGoogle Scholar
Quensel, P. 1951. The charnockite series of Varberg District on the South-western coasts of Sweden. Ark. Miner. Geol. Band 1, 10, 227–332.Google Scholar
Ramberg, H., 1949. The facies classification of rocks. J. Geol. 57, 18.CrossRefGoogle Scholar
Ramberg, H., 1952. The Origin of metamorphic and metasomatic rocks—a treatise, on recrystallization and replacement in the earth's crust. Univ. Chicago Press, 317 pp.Google Scholar
Rosenqvist, J. T. H. 1952. The metamorphic facies and the felspar minerals. Univ. Bergen Arbok, 1952, 1–108.Google Scholar
Subramaniam, A. P. 1959. Charnockites of the type area near Madras—A reinterpretation: Am. J. Sci. 257, 321–53.CrossRefGoogle Scholar
Sutton, J. & Watson, J. 1951. The pre-Torridonian metamorphic history of the Loch Torridon and Scourie areas in the North-West Highlands and its bearing on the chronological classification of the Lewisian. Q. Jl geol. Soc. Lond. 106, 241–96.CrossRefGoogle Scholar
Wilson, A. F. 1952. The charnockite problem in Australia. Univ. of Adelaide, Sir Douglas Mawson Anniversary Vol., 203–24.Google Scholar