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Research Article
Petrography and Mineral Chemistry of the Boroujerd Pluton (Sanandaj-Sirjan Zone, Western Iran)

A. Ahmadi Khalaji, Z. Tahmasbi and R. Zarei Sahamieh

Journal of Applied Sciences, 2009, 9(5), 843-853.

Abstract

The Boroujerd pluton is chiefly constituted of quartz-diorite, granodiorite and monzogranite. The mineral chemistry and microprobe analysis of mineral assemblages in these rocks indicate that the magma in this area has a metaluminous to slightly peraluminous composition, related to calc-alkaline, arc-type magmas and displays features typical of I-type granitoids. Also, the average pressure and temperature is estimated at 1.093 ± 0.6 k bars and 785 ± 40 in quartz-diorites, respectively. All analyzed samples have log FO2-14.1 which show this magma crystallized in high oxygen fugacity. Also, the occurrence of magnesio-hornblende and Fe2+biotite in Boroujerd rocks suggest relatively oxidized magma.

ASCI-ID: 35-2855

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