Abstract
The metamorphic rocks of the Jutogh Series around Simla, structurally overlying the less metamorphosed rock groups along a thrust contact, have been involved in three phases of deformation and two episodes of metamorphism. The first metamorphism is in the albite-epidote-amphibolite facies in a major part of the area, reaching the amphibolite facies locally in the central part. This metamorphism is late-to post-kinematic with reference to the F 1 movement, the thermal peak having been reached in a post-F 1 pre-F 2 static phase. The second metamorphism, syn-to post-tectonic with respect to F 2 but preceding F 3, is generally in the greenschist facies, and only locally in the albite-epidote-amphibolite facies in the higher structural levels. Metamorphic overprinting has caused widespread retrogression and disequilibrium assemblages. As the large scale recumbent folding and thrusting of F 1 and F 2 phases belong to the Tertiary Himalayan orogeny, the metamorphism in the Jutogh Series could not have been Precambrian in age.
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Naha, K., Ray, S.K. Metamorphic history of the Jutogh Series in the Simla klippe, lower Himalayas. Contr. Mineral. and Petrol. 28, 147–164 (1970). https://doi.org/10.1007/BF00404996
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DOI: https://doi.org/10.1007/BF00404996