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Petrology of Jutogh Metapelites near Chaur, Himachal Himalaya, India
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The Jutogh metasediments in Chaur area have undergone three phases of deformation D1, D2 and D3 respectively, associated with two metamorphic episodes M1 and M2. The M1 episode was synkinematic in relation to the F1 folding phase (D1) and continued postkinematically to F1. reaching its climax during a static phase between D1 and D2. Most of the porphyroblastic minerals such as staurolite, kyanite, sillimanite and even garnet crystallized during this period. The M2 metamorphism superposed M1 during D2 deformation and was of retrograde nature. The isograds have been delineated by specific mineral reactions and the zones are characterised by critical mineral assemblages.
Metamorphic conditions suggest pressure of about 6.0 (±0.5) kb, and temperatures of 540°C (±10°C), 560°C (±10°C), 640°C (±10°C) and 650°C (±10°C) in zones (B) garnet-chlorite, (C) staurolite-biotite, (D) kyanite-biotite and (E) sillimanitegarnet-biotite, respectively.
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