Skip to main content
Log in

Coexisting pyroxenes from the basic granulites of Visakhapatnam area in the Eastern Ghats terrain

  • Published:
Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences Aims and scope Submit manuscript

Abstract

Fifteen pairs of coexisting pyroxenes from basic granulites associated with leptynites in the khondalite suite of rocks are analysed and the distribution of Mg and Fe2+ ratios is presented. Temperature estimates for the coexisting pyroxenes from the basic granulites of Visakhapatnam may be expressed as 750±100†C corresponding to intermediate pressure granulites.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

References

  • Bartholome P 1962 Iron-magnesium ratio in associated pyroxenes and olivines;Geol. Soc. Am. Bull., Buddington Volume 1–20

  • Bertrand P and Mercier J C C 1985 The natural solubility of coexisting ortho- and clino-pyroxenes towards an absolute geothermometer for the natural system;Earth. Planet. Sci. Lett. 76 109–122

    Article  Google Scholar 

  • Davidson P M and Lindsley D H 1989 Thermodynamic analysis of pyroxene-olivine-quartz equilibria in the system CaO−MgO−FeO−SiO2;Am. Mineral. 74 18–30

    Google Scholar 

  • Deer W A, Howie R A and Zussman J 1963Rock-forming minerals; 1 ortho- and ring-silicates (London: Longmans)

    Google Scholar 

  • Fonarev V I and Graphchicov A A 1987Physical-chemical petrology (Moscow: Nauka)14 118–136 (in Russian)

    Google Scholar 

  • Halden N M, Bowers D R and Dash B 1982 Structural evolution of migmatites in granulite facies terraine, Precambrian crystalline complex of Angual, Orissa, India,Trans. R. Soc., Edin. Earth Sci. 73 109–118

    Google Scholar 

  • Hess H H 1949 Chemical composition and optical properties of common clinopyroxenes; Part I;Am. Mineral. 34 621–666

    Google Scholar 

  • Hess H H 1952 Orthopyroxenes of the Bushveld type: Ion substitutions and changes in unit cell dimensions;Am. J. Sci., Bowen Volume 173–188

  • Howie R A 1955 The geochemistry of the charnockite series of Madras, India;R. Soc. Edin. Trans. 62 725–768

    Google Scholar 

  • Jayawardena D E Des and Carswell D A 1976 The geochemistry of charnockite and their constituent ferro-magnesium minerals from the Precambrian of Southeast Sri Lanka;Miner. Mag. 40 541–554

    Article  Google Scholar 

  • Kretz R 1961 Some applications of thermodynamics of coexisting minerals of varying compositions. Examples: Ortho- pyroxenes—clinopyroxenes and orthopyroxenes-garnet;J. Geol. 69 361–387

    Google Scholar 

  • Kretz R 1963 Distribution of magnesium and iron between orthopyroxene and clinopyroxene in natural mineral assemblages;J. Geol. 71 773–785.

    Google Scholar 

  • Kretz R 1982 Transfer and exchange equilibria in a portion of the pyroxene quadrilateral as deducted from natural and experimental data;Geochim. Cosmochim Acta. 46, 411–421

    Article  Google Scholar 

  • Leelanandam C 1967 Chemical study of pyroxenes from the charnockitic rocks of Kondapalli, Andhra Pradesh, India; with emphasis on the distribution of elements in coexisting pyroxenes;Miner. Mag. 36 153–179

    Article  Google Scholar 

  • Lindsley D H 1983 Pyroxene thermometry;Am. Mineral. 68 477–493

    Google Scholar 

  • Mueller R F 1960 Compositional characteristics and equilibrium relations in mineral assemblages of metamorphosed iron formation;Am. J. Sci. 258 581–598

    Google Scholar 

  • Muir I D 1951 The clinopyroxenes of the Skaergaard intrusion, Eastern Greenland;Miner. Mag. 29 690–714

    Article  Google Scholar 

  • Paul D K, Ray Barman T, Mcnaughton N J, Fletcher I R and Potts P J 1990 Archaean-Proterozoic evolution of Indian charnockites: Isotopic and geochemical evidence from granulites of the Eastern Ghats belt;J. Geol. 98 253–263

    Article  Google Scholar 

  • Perraju P, Kovach A and Svingor E 1979 Rubidium-strontium ages of some rocks from parts of the Eastern Ghats of Orissa and Andhra Pradesh, India;J. Geol. Soc. India 20 290–296

    Google Scholar 

  • Powell R 1978 The thermodynamics of pyroxene geotherms;Philos. Trans. R. Soc. London A288 457–469

    Article  Google Scholar 

  • Rao A T and Rao P N V 1987 Reaction zones from leptynites of Visakhapatnam, Andhra Pradesh;Geophys. Res. Bull. 25 191–195

    Google Scholar 

  • Sriramdas A and Rao A T 1979 Charnockites of Visakhapatnam, Andhra Pradesh;J. Geol. Soc. India 20 512–517

    Google Scholar 

  • Yoshida M, Funaki M and Vitanage P W 1990 Justapositon of India-Sri Lanka-Antarctica in proterozoic to mesozoic Gondwana. (eds) Y Hiroi and Y Motoyoshi; inStudy of geological correlation between Sri Lanka and Antarctica; Interim report of Japan-Sri Lanka Joint Research 118–131

  • Wells P R A 1977 Pyroxene thermometry in simple and complex systems;Contrib. Miner. Petrol. 62 129–139

    Article  Google Scholar 

  • Wood B J and Banno S 1973 Garnet-orthopyroxene and ortho-pyroxene-clinopyroxene relationships in simple and complex systems;Contrib. Miner. Petrol. 42 109–124

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Rights and permissions

Reprints and permissions

About this article

Cite this article

Rao, A.T., Rao, J.U., Rao, A.M. et al. Coexisting pyroxenes from the basic granulites of Visakhapatnam area in the Eastern Ghats terrain. Proc. Indian Acad. Sci. (Earth Planet Sci.) 100, 281–291 (1991). https://doi.org/10.1007/BF02895988

Download citation

  • Received:

  • Revised:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02895988

Key words

Navigation