Volume 16, Issue 1 (4-2008)                   www.ijcm.ir 2008, 16(1): 3-12 | Back to browse issues page

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HT-MP metamorphism at the Shahindezh Metamorphic Core (SMC) –NW Iran; Mineral chemistry and thermobarometry of metapelites. www.ijcm.ir. 2008; 16 (1) :3-12
URL: http://ijcm.ir/article-1-645-en.html
Abstract:   (2624 Views)

On the basis of microstructural evidence it is clear that SMC metapelites have experienced at least two regional (RM1, RM2) and one contact metamorphism (CM). During RM2, several porphyroblasts including kyanite, andalusite, staurolite, cordierite, garnet and fibrous sillimanite have grown in the mica - schists. In order to estimate the PT condition of metamorphism of metapelites, we used cation exchange and multi-equilibrium methods. Temperature of RM2 estimated using, Grt - Bt and Grt - Chl thermometry 650 - 700 °C. Also PT conditions are calculated by THERMOCALC computer program which is based on multi-equilibrium reactions. Kyanite - staurolite - cordierite - bearing mica - schists are metamorphosed at pressure ~5 - 7 kbar and temperature ~650  ±50 °C. Thermal gradient at the SMC is considered to be ~ 40 °C/km. This thermal gradient is similar to those from continent-continent collision settings.

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Type of Study: Research | Subject: Special

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