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Preliminary magnetic susceptibility characteristics of the Bharati promontory (Grovness Peninsula), Larsemann Hills, Prydz Bay region, East Antarctica

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Journal of the Geological Society of India

Abstract

The coastal tract of the Prydz Bay region in the East Antarctica exposes Archean to Late Proterozoic magmatic and medium- to high grade (amphibolite — granulite facies) metamorphic rocks. The para- and ortho gneisses from the Bharati promontory (Grovness Peninsula) forming a part of the Larsemann Hills in the southern segment of Prydz Bay were investigated for magnetic characterization. In this small peninsula the upper amphibolite facies gneisses occur as NE-trending bands. The para-gneisses show a range of mineral assemblages (± cordierite ± sillimanite ±garnet) while ortho-gneiss mineralogy includes quartz, feldspar, biotite, garnet. All the lithological units in Bharati promontory contain ubiquitous magnetite, however, with wide variation in the volume proportions. This has resulted in a wide range in magnetic susceptibility (10−4 to 10−2 SI). Magnetic foliations show a correspondence with the general trend of lithounits (050° NE) and define a resulting geometry of mainly D1 and D2 foliations. The magnetic lineations show a preferred orientation with moderate easterly plunge (mean vector 093/36). The findings have implications for the magnetic field survey because such fabrics would impart a strong horizontal component of induced magnetization.

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  1. Department of Geology, University of Rajasthan, Jaipur, 302 004, India

    Manoj K. Pandit

  2. Geozentrum Nordbayern, Universitat Erlangen-Nürnberg, Schlossgarten 5, D-91054, Erlangen, Germany

    Helga de Wall

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  1. Manoj K. Pandit
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Pandit, M.K., de Wall, H. Preliminary magnetic susceptibility characteristics of the Bharati promontory (Grovness Peninsula), Larsemann Hills, Prydz Bay region, East Antarctica. J Geol Soc India 84, 163–173 (2014). https://doi.org/10.1007/s12594-014-0119-x

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