Abstract
The study area situated in the eastern Arunachal Pradesh forms a part of the Trans-Himalayan belt which is also known as the Lohit Himalaya. The main stratigraphic units of the area are Lohit Granitoid Complex and Etalin Formation, and their contact is intrusive in nature. The Lohit Granitoid Complex forms the most conspicuous unit in the eastern Arunachal Pradesh. It consists of multi variant plutonic rocks of multiphase character with several restites of high grade metasediments. The granitoids include diorite, granodiorite, tonalite, hornblende-biotite granite and leucogranite. The high grade restites are designated as Etalin Formation. The overall bulk composition of the Lohit Granitoid is dioritic to quartz dioritic. After analysing the geochemical data, it has been deciphered that Lohit granitoid is I-type, calc alkaline and metaluminous in nature. This granitoid represents the Andean type magmatism due to melting of the north dipping Tethyan oceanic crust below an island arc situated along the southern margin of Eurasia.
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