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Petrology and tectonic development of supracrustal sequence of Kerala Khondalite Belt, Southern IndiaThe granulite terrain of southern India, of which the Kerala Khondalite belt (KKB) is a part, is unique in exposing crustal sections with arrested charnockite growth in different stages of transformation and in varied lithological association. The KKB with rocks of surficial origin and incipient charnockite development, poses several problems relating to the tectonics of burial of vast area and mechanisms involved in expelling initial H2O (causes of dryness) for granulite facies metamorphism. It is possible to infer the following sequence of events based on the field and laboratory studies: (1) derivation of protoliths of KKB from granitic uplands and deposition in fault bounded basin (cratonic rift); (2) subhorizontal deep burial of sediments; (3) intense deformation of infra and supracrustal rocks; (4) early granulite facies metamorphism predating F sub 2 - loss of primary structure in sediments and formation of charnockites from amphibole bearing gneisses and khondalites from pelites; (5) migmatisation and deformation of metasediments and gneisses; (6) second event of charnockite formation probably aided by internal CO2 build-up; and (7) isothermal uplift, entrapment of late CO2 and mixed CO2-H2O fluids, formation of second generation cordierites and cordierite symplectites.
Document ID
19890012873
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kumar, G. R. Ravindra (Centre for Earth Science Studies Trivandrum (India)., United States)
Chacko, Thomas (Chicago Univ. IL., United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1988
Publication Information
Publication: Lunar and Planetary Inst., Workshop on the Deep Continental Crust of South India
Subject Category
Geophysics
Accession Number
89N22244
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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