Geothermobarometry and pryrogenesise of Jaghin Gabbro in southeast of Rudan city, Hormozgan Province

Jaghin ophiolite rocks are located in the east of Hormozgan Province and southeast of Rudan city in the ‎direction of the Makran zone. Lithologically, ultrabasic rocks such as dunite and harzburgite, and basic magma, including gabbro-norite and basalt, have been identified. According to chemical crystal analysis, the composition of pyroxenes in basic (Gabbro-norite) rocks is more than iron and magnesium, and poor of sodium, which included clinopyroxen with diopside and sometimes augite composition, as well as orthopyroxene is more than bronzite composition. Plagioclase crystals present in gabbro-norite rocks, also divide into high-sodium and medium-calcium types, which have mostly composition between albite and bitonite. Due to the thermometric of these masses and the utilize of the two-pyroxene method, the ‎temperature of forming these masses is determined to be 800-1200 °C and‎, also using the barometric of aluminum distribution in pyroxenes, the pressure on the clinopyroxenes formation estimated to be about 6-12 kbars.