Thermobarometry of the Astaneh Pluton and its Related Subvolcanic Rocks (Sanandaj-Sirjan Zone, Western Iran)

Abstract Volume of Sixth Nepal Geolgical Congress on Geology, Natural Resources, Infrastructures, Climate Change and Natural Disasters, 15 – 17 November 2010, Kathmandu, Nepal

“…Application of hornblendeplagioclase thermometer to calculate the temperature of crystallisation of the basement rocks are 680-725ºC and Alin-hornblende barometry results yielded a pressure range 4.9-6.4 kbar at 680-725ºC (Hossain et al 2009). The occurrences of Mg-rich pargacite, magnesio-hornblende and Fe 2+ biotite in dioritic rocks suggest relatively oxidized magma (Tahmasbi et al 2009). Wones (1989) made quantitative estimation of fugacity based on the equilibrium expression:…”