Mineral chemistry and thermobarometry of Bibi Maryam granitoid (Northeast of Nehbandan, East of Iran)


Department of geology, faculty of sciences, University of Birjand


Bibi Maryam granitoid is located in Nehbandan ophiolite, the northern part of Sistan suture zone.Field evidence proves anintrusion of granitoid into ultramafic and mafic host rocks. This mass is mainly composed of tonalite (to quartzdiorite). The main minerals are plagioclase, quartz, biotite, hornblende and little alkali feldspar and the accessory minerals include sphene, apatite, zircon and opaque (magnetite). Microprobe analyses show that plagiclases with composition ranges between Ab63.6، An36.4 to Ab50 are of andesine type. Micas are Mg-rich biotite and have tendency toward phlogobite. On the basis of biotites chemistry, Bibi Maryam granitoid is made up of a calc-alkaline magma. Calcic amphibole with magnesiohornblende composition is one of the mafic minerals in the rocks. The amphiboles under study are related to suprasubduction amphibole, S-Amph. On the basis of Al content in hornblende barometry, Bibi Maryam granitoid made under varying pressures, appeared to be 3.1-5.2 kbar; Also, according to coexisting hornblende and plagioclase thermometry, the temperature ranged from 730 to 780ºC. The estimated temperature, using zircon content versus cationic ratio [(Na+K+2Ca)/(Al*Si)] for Bibi Maryam tonalite is 750-770ºC which is comparable to that obtained by hornblende - plagioclase thermometry.


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