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Petrology of High Grade Migmatitic Gneisses of the Lesser-Higher Himalayan Rocks of Western Sikkim, India

Jindal, Jayprakash (2013) Petrology of High Grade Migmatitic Gneisses of the Lesser-Higher Himalayan Rocks of Western Sikkim, India. Masters thesis, Indian Institute of Scienc e Education and Research Kolkata.

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    Abstract

    This dissertation was carried out in the Lesser-Higher Himalayan migmatitic gneisses in western Sikkim, India. The study area is represented dominantly by thick sequence of pelitic migmatites, characterized by quartzofeldspathic leucosomes alternating with melanosomes, containing a combination of garnet, biotite, sillimanite, and the metapelites are completely devoid of muscovite. Textural features establish operation of Muscovite dehydration-melting reactions. Modeling of phase equilibria was carried out with the help of pseudosections using average bulk composition of pelites. In the present dissertation peak as well as retrograde pressure-temperature conditions of metamorphism were deduced using conventional geothermobarometric method. The results of individual thermobarometry shows that the rocks of Higher Himalaya in the study region has suffered a peak pressure-temperature of 9.6 kbar, 900⁰C were as the peak conditions for Lesser Himalayan rocks were 8.9kbar, 750⁰C.

    Item Type: Thesis (Masters)
    Additional Information: Supervisors: Prof Somnath Dasgupta and Dr. Vadlamani Ravikant
    Uncontrolled Keywords: Petrology; Migmatitic Gneisses; Lesser-Higher Himalayan Rocks; Western Sikkim; Pelitic Migmatites; Quartzofeldspathic Leucosomes;
    Subjects: Q Science > QE Geology
    Divisions: Faculty of Engineering, Science and Mathematics > School of Geography
    Depositing User: IISER Kolkata Librarian
    Date Deposited: 08 May 2013 09:14
    Last Modified: 12 Nov 2014 10:22
    URI: http://eprints.iiserkol.ac.in/id/eprint/65

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