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Manudip Kaur ¹, L. S. Chamyal ¹

Affiliations
1 Department of Geology, M. S. University of Baroda, Baroda-390 002, IN

Abstract

In the Higher Kumaun Himalaya granitoids are widely distributed and occur as bands, lenses or sheet-like bodies. They include different varieties of gneissic granites (schistose, foliated, augen and porphyroblastic). The field, petrographic as well as chemical data indicate that the granitoids of Kumaun Higher Himalaya are formed due to metasomatic transformation of metasediments by alkalirich emanations. The geochemistry of these reveal their calc-alkaline, peraluminous, S-type nature and compositionally mainly represent granite. Trace elements discriminate the granitoids in the syncollisional environment.

Keywords

Granitoids, Metasomatism, Kumaun Himalaya.

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Manudip Kaur ¹, L. S. Chamyal ¹, N. Sharma ¹, T. N. Jowhar ²

Affiliations
1 Department of Geology, M.S.University of Baroda, Vadodara-390002, IN
2 Department of Geology, University of Delhi, Delhi-110007, IN

Abstract

The granitoids of eastern Higher Kumaun Himalaya show a metamorphic history extending from the Precambrian to Tertiary. The granitisation and formation of the granitoids within the Higher Himalaya were related to an early metamorphism (M₁) that took place during Precambrian. Temperatures of the granitoids of eastern Higher Kumaun Himalaya are estimated based on co-existing feldspar pairs, alkali feldspar-muscovite geothermometer and Ti content in micas and are found to be in conformity with temperatures prevailing in the upper amphibolite facies.

Keywords

Geothermometry, Metamorphism, Granitoids, Kumaun Himalaya.

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