Vol. 3,No. 9, September 2013

Author(s): Amin panahi, Reza Keshavarzi, Masood kiani, Mansor Taheri, Bahman Javadian

Abstract: The Neshveh intrusive mass is located in the Northeast of Saveh and is considered as a part of the Urumieh-Dokhtar magmatic arc (UDMC). The mass is replaced in the Eocene-Oligocene volcanosedimentary rocks consist mainly of quartz monzodiorite, granodiorite and granite. Based on the Field studies, petrographical and geochemical evidences, the Neshveh rocks have derived from a K-rich, metaluminous calc-alkline magma. P2O5 versus SiO2 has a decreasing trend that is a sign of I-type rocks. Due to entrance into the structure of minerals like: Fe-Ti oxides, plagioclase and hornblende, MgO, Fe2O3, MnO, Al2O3 and TiO2decrease with increasing SiO2. On the other hand Rb and Ba increasing trend demonstrate no fractionation of biotite and K-feldspar during the magma evolution. Y decreasing trend results from fractionation of hornblende. REE patterns of the studied rocks normalized by Chondrite, follow same trend representing their unity source and the role of the fractionation in the magma evolution. Low amounts of some elements such as; V, Co, Cr, Ni, Mg# in Neshveh intrusive rocks reveal their formation from an evolved magma.

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