University of Isfahan Petrological Journal 2228-5210 1 1 2010 05 22 Petorgenesis of the granitoid body in the south of Shazand (South western Arak) Petorgenesis of the granitoid body in the south of Shazand (South western Arak) 87 102 16033 FA Zahra Tahmasbi Mahmoud Khalili Ahmad Ahmadi Khalaji دانشگاه لرستان، دانشکده علوم پایه، گروه زمین شناسی Mohammad Ali Makki Zadeh Journal Article 2016 06 14 The Astaneh granitoid massif represents a small portion of Sanandaj – Sirjan zone and consists of tonalite, granodiorite, monzogranite and rhyodacite, being the granodiorites the most dominant rocks. Petrological, mineralogical, field and geochemical investigations suggest that the Astaneh granitoid is similar to those of the high-K calc-alkaline series, metaluminous to weakly peraluminous, and displays features typical of I-type granites. Low Al2O3/ (FeO+MgO+TiO2) and (Na2O+K2O)/ (FeO+MgO+TiO2) ratios, and the trace and rare-earth elements patterns suggest that these rocks formed along a destructive plate margin and were derived from a lower crustal source. The granitoid magma involves partial melting of lower crustal protoliths (Amphibolites) and fractional crystallization of the melts in higher crustal levels generated the whole spectrum of rock types represent in the Astaneh massif. Mantle-derived basaltic magmas emplaced into the lower crust are the most likely heat sources for partial melting. The Astaneh granitoid massif represents a small portion of Sanandaj – Sirjan zone and consists of tonalite, granodiorite, monzogranite and rhyodacite, being the granodiorites the most dominant rocks. Petrological, mineralogical, field and geochemical investigations suggest that the Astaneh granitoid is similar to those of the high-K calc-alkaline series, metaluminous to weakly peraluminous, and displays features typical of I-type granites. Low Al2O3/ (FeO+MgO+TiO2) and (Na2O+K2O)/ (FeO+MgO+TiO2) ratios, and the trace and rare-earth elements patterns suggest that these rocks formed along a destructive plate margin and were derived from a lower crustal source. The granitoid magma involves partial melting of lower crustal protoliths (Amphibolites) and fractional crystallization of the melts in higher crustal levels generated the whole spectrum of rock types represent in the Astaneh massif. Mantle-derived basaltic magmas emplaced into the lower crust are the most likely heat sources for partial melting. https://ijp.ui.ac.ir/article_16033_4e254da7a847f01c03280ffa988df7a4.pdf