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  • 1
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    The Kerala Khondalite Belt (KKB) of Southern India: An ensialic mobile belt (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: The Proterozoic Kerala Khondalite belt of the Southern Indian Shield is described, a belt dominated by granulite grade (750 C, 5 to 6 kbar) supracrustal rocks whose protoliths included arkoses and shales with cratonic provenances. Rare earth elements and other geochemical signatures suggest a granitic source for these metasediments, possibly the spatially associated charnockite massifs. The presence of intercalated mafic gneisses, interpreted as basalts, implies a cratonic rift basin rather than a foreland basin setting. It was argued that the Kerala, as well as other early Proterozoic mobile belts formed during abortive continental rifting without major additions of new crust.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst., Workshop on the Growth of Continental Crust; p 45-47
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Petrology and tectonic development of supracrustal sequence of Kerala Khondalite Belt, Southern India (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The 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.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst., Workshop on the Deep Continental Crust of South India; p 149-150
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    NASA TECHNICAL REPORTS
  • 3
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    Water activities in the Kerala Khondalite Belt (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The author and colleagues presented their determinations of water activities in various granulite-facies rocks of the Kerala Khondalite Belt. Using mineral equilibria, thermodynamic data, and assumed geopressure-geotemperature conditions of 5.5 kbar and 750 C, they calculated uniformly low a(H2O) values of about 0.27 over a large geographic region. They suggested that these conditions were produced by the presence of abundant CO2-rich fluids, derived either from deeper levels or from metamorphic reactions involving graphite.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst., Workshop on the Deep Continental Crust of South India; p 40-42
    Format: application/pdf
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