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Structural evolution of migmatites in granulite facies terrane: Precambrian crystalline complex of Angul, Orissa, India

Published online by Cambridge University Press:  03 November 2011

N. M. Halden ,
D. R. Bowes  and
B. Dash
N. M. Halden
Affiliation:
Department of Geology, University of Glasgow, Glasgow G12 8QQ, Scotland.
D. R. Bowes
Affiliation:
Department of Geology, University of Glasgow, Glasgow G12 8QQ, Scotland.
B. Dash
Affiliation:
Department of Geology, Utkal University, Bhubaneswar 751 004, Orissa, India.
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Abstract

Basic granulites, a variety of gneisses including sillimanite-garnet gneiss (khondalite), charnockite and intruded quartzofeldspathic material make up a migmatite complex showing evidence of polyphase deformation, polymetamorphism and successive neosome emplacement. The heterogeneity of the migmatites is dominantly the result of folding and boudinage rather than igneous activity.

Tight to isoclinal folds of the second recognised deformational phase affect lithological layering, granulite facies fabric elements of the first deformational phase and early neosome; they played a major role in the development of the macroscopically heterogeneous nature of the complex and they are also a key structure for correlation. Upright folds of the third deformational phase control the major disposition of lithological units and, together with their axial planar fabric, controlled the uprise of quartzofeldspathic neosome and of volatiles and heat which caused localised ‘charnockitisation’ of sillimanite-bearing gneisses. The effects of semibrittle and brittle deformation, including kink bands, fractures and shears, express late deformational phases during which there was neosome emplacement, some at 854 ± 6 m.y. ago (Rb–Sr muscovite age).

Keywords

boudinage‘charnockitisation’deformational phasefoldinggneissmuscoviteneosomepolymetamorphismpolyphase deformationRb–Sr mineral agesillimanite.
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 73 , Issue 2 , 1982 , pp. 109 - 118
Copyright
Copyright © Royal Society of Edinburgh 1982

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References

7. References

Beckinsale, R. D., Drury, S. A. & Holt, R. W. 1980. 3360-Myr old gneisses from the South Indian Craton. NATURE 283, 469–70.CrossRefGoogle Scholar
Black, L. P., Bell, T. H., Robenach, M. J. & Withnall, I. W. 1979. Geochronology of discrete structural–metamorphic events in a multiply deformed terrain. TECTONOPHYSICS 54, 103–38.Google Scholar
Bowes, D. R. 1978. Shield formation in early Precambrian times: the Lewisian complex. In Bowes, D. R. & Leake, B. E. (eds) Crustal evolution in northwestern Britain and adjacent regions, 39–80. GEOL J SPEC ISSUE 10.Google Scholar
Bowes, D. R., & Hopgood, A. M. 1976. Significance of structural trend in Precambrian terrain. ACTA GEOL POL 26, 57–82.Google Scholar
Campbell, D. S. 1980. Structural and metamorphic development of migmatites in the Svecokarelides, near Tampere, Finland. TRANS R SOC EDINBURGH EARTH SCI 71, 185–200.Google Scholar
Campbell, D. S., Treloar, P. J. & Bowes, D. R. 1979. Metamorphic history of staurolite bearing schists from the Svecokarelides, near Heinävaara, eastern Finland. GEOL FOREN FORH STOCKHOLM 101, 105–18.Google Scholar
Halden, N. M. 1982. Structural, metamorphic and igneous history of migmatites in the deep levels of a wrench fault regime, Savonranta, eastern Finland. TRANS R SOC EDINBURGH EARTH SCI 73, 17–30.Google Scholar
Hopgood, A. M. 1968. The structural geology and tectonic history of Pre-Cambrian rocks exposed in the Kinarsani River, eastern Andhra Pradesh. J INDIAN GEOSCI ASSOC 8, 13–34.Google Scholar
Hopgood, A. M. 1980. Polyphase fold analysis of gneisses and migmatites. TRANS R SOC EDINBURGH EARTH SCI 71, 55–68.CrossRefGoogle Scholar
Hopgood, A. M. & Bowes, D. R. 1978. Neosomes of polyphase agmatites as time-markers in complexly deformed migmatites. GEOL RUNDSCH 67, 313–30.Google Scholar
Hopgood, A. M., Bowes, D. R. & Addison, J. 1976. Structural development of migmatites near Skåldö, south-west Finland. BULL GEOL SOC FINL 48, 43–62.Google Scholar
Hopgood, A. M., Bowes, D. R., Kouvo, O. & Halliday, A. N. 1983. U-Pb and Rb-Sr isotopie study of polyphase deformed migmatites in the Svecokarelides, southern Finland. In Atherton, M. P. & Gribble, C. D. (eds) High grade metamorphism, migmatites and melting. Orpington: Shiva.Google Scholar
Janardhan, A. S., Newton, R. C. & Smith, J. V. 1979. Ancient crustal metamorphism at low P112o: charnockite formation at Kabbaldurga, south India. NATURE 278, 511–4.CrossRefGoogle Scholar
Krishnan, M. S. 1953. The structural and tectonic history of India. MEM GEOL SURV INDIA 81, 1–109.Google Scholar
Lyon, T. D. B. & Bowes, D. R. 1977. Rb-Sr, U-Pb and K-Arisotopie study of the Lewisian between Durness and Loch Laxford, Scotland. KRYSTALINIKUM 13, 53–72.Google Scholar
Mehnert, K. R. 1968. Migmatites and the origin of granitic rocks. Amsterdam: Elsevier.Google Scholar
Naha, K. 1964. A critique of “orogenic trends” in Archaean correlation in India. TECTONOPHYSICS 1, 431–8.CrossRefGoogle Scholar
Pichamuthu, C. S. 1967. The Precambrian of India. In Rankama, K. (ed.) The Precambrian 3, 1–96. New York: John Wiley.Google Scholar
Raith, M., Raase, P., Ackermand, D. & Lal, R. K. 1982. Regional geothermobarometry in the granulite facies terrane Of South India TRANS R SOC EDINBURGH EARTH SCI 73 (in press).Google Scholar
Ray, S. & Bose, M. K. 1975. Tectonic and petrologie evolution of the Eastern Ghats Precambrian belt. GEOL CHAYANICA 1, 1–13.Google Scholar
Sederholm, J. J. 1967. Selected works: granites and migmatites. Edinburgh: Oliver & Boyd.Google Scholar
Swami Nath, J. & Ramakrishnan, M. 1981. Early Precambrian supracrustals of Southern Karnataka. MEM GEOL SURV INDIA 112.Google Scholar