TY - JOUR T1 - Geochemistry, petrogenesis and mineralization of Namen plutonic rocks, SW of Sabzevar zone TT - ژئوشیمی، سنگ‌زایی و کانی‌زایی سنگ‌های نفوذی نامن، جنوب غربی پهنهی سبزوار JF - ijcmir JO - ijcmir VL - 23 IS - 3 UR - http://ijcm.ir/article-1-158-en.html Y1 - 2015 SP - 517 EP - 532 KW - Geochemistry KW - petrology KW - magnetite KW - Namen pluton KW - Sabzevar zone N2 - Namen pluton is located in the SW of Sabzevar Zone and is composed of three different phases include two granitoid units and a basic phase. Namen syeno-granites (SG unit) are high temperature magmas enriched in HFSE such as Ga, Nb, Ta and Zr; and classified as aluminous A-type granitoids. This magmatic phase has been generated by partial melting of felsic rocks. The main phase of Namen pluton (BG unit) contains assemblage of various granitoids (granodiorite, quartz monzodiorite, quartz diorite). This phase shows I-type granitoid characteristics and has been yielded by amphibolite melting in the lower crust. Mafic rocks consist of hornblende gabbros which have cumulative texture of amphibole and plagioclase. There are diffused and circular patches of magnetite ore in some sections of gabbroic occurrences. Magnetite-hosted hornblende gabbros (MHB) are enriched of V, Cr, Co, Cu, Zn and Ca and depleted from incompatible elements of LILE and HFSE relative to other gabbros (HB). The separation of volatile phases during the gabbroic magma evolution has led to the segregation of primary magma. Finally, the F- P and H2O-S enriched parts of this fractionated magma have formed HB and MHB rocks, respectively. M3 ER -