The Crystalline Thrust Sheets in the Himachal Himalaya and the Age of Amphibolite Facies Metamorphism

Abstract

Three distinct crystalline thrust sheets exist in the Himachal Himalaya. These in ascending tectonic order of superposition are: (i) Kulu Thrust Sheet, (ii) Jutogh Thrust Sheet and (iii) Vaikrita Thrust Sheet. The crystalline thrust sheets show five deformations and polyphase metamorphism. The analysis of existing data suggests that there have been Precambrian deformations and attendant metamorphism. The Kulu and Vaikrita Thrust Sheets extend throughout the length of the Himalaya and the latter's equivalents consistently form the floor for the Tethyan sequences.