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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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