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Tectonometamorphic Evolution of Jutulsessen, Gjelsvikfjella, cDML, East Antarctica

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Journal of the Geological Society of India

Abstract

The Jutulsessen area, can provide a vital clue to the supercontinent assembly of Gondwana Land as it is situated within the Circum East Antarctic Mobile Belt just east of the Penksockett rift marking the divide between the central Dronning Maud Land from the Western Dronning Maud Land. This landmass is dominated by migmatitic quartzo-feldspathic rocks intruded by syn to post-tectonic granites. The work highlights the data from western part cDML area with a view to arrive at a more comprehensive model for the cDML and subsequently to the super continent assembly. Granitic and migmatitic gneisses comprising of amphibolitic and biotite rich enclaves. The gneisses show variations from quartzo-felspathic gneiss to amphibolitic gneiss. The area has witnessed complex geological history involving at different deformational episodes with concomitant metamorphism. The pervasive dominant foliation trends NW-SE with shallow to medium dips towards SW. In the Stabben area, a nonfoliated intrusive syenite-gabbro pluton limits the gneissic exposures. Compositionally, the orthogneisses plot in the monzogranitegranodiorite field where as the mafic dykes/enclaves plot in the basalt-andesite-rhyodacite field. The bulk geochemical characteristics suggest significant crustal contamination. Garnet-biotite Fe-Mg exchange thermometry gives peak metamorphic temperature of 483° C for the gneisses and 628° C for the dioritic enclave within gneisses. A peak metamorphic grade of upper amphibolite to granulite facies is deduced from the mineral assemblages. Widespread anatexis has led to extensive occurrence of migmatites in the area. Recent geochronological studies assign an age of 1170 Ma to 970 Ma for the migmatites/gneisses and an emplacement age of 501 Ma for the Stabben gabbro and syenite. The discriminant plots of the Jutulsessen rocks indicate diverse origin ranging from pre-plate collision to post-collision orogenic tectonic setting. The mafic enclaves/dykes show ocean island arc to MORB affinities. Voluminous addition of juvenile crust during the Pan-African orogeny strongly overprints earlier structures.

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Authors and Affiliations

  1. Polar Studies Division, Geological Survey of India, Faridabad, 121 001, India

    Amit Dharwadkar

  2. State Unit Sikkim, Geological Survey of India, Gangtok, 737 101, India

    Prakash K. Shrivastava

  3. Department of Geology, Banaras Hindu University, Varanasi, 221 005, India

    Hari B. Srivastava

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  1. Amit Dharwadkar
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  2. Prakash K. Shrivastava
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Correspondence to Prakash K. Shrivastava.

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Dharwadkar, A., Shrivastava, P.K. & Srivastava, H.B. Tectonometamorphic Evolution of Jutulsessen, Gjelsvikfjella, cDML, East Antarctica. J Geol Soc India 92, 265–280 (2018). https://doi.org/10.1007/s12594-018-1003-x

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