Geology,Petrography and geochemical of the Selijerd Intrusive Rocks, Northeast Saveh, Central Iran
Journal Title: International Research Journal of Applied and Basic Sciences - Year 2014, Vol 8, Issue 10
Abstract
The Selijerd 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 Selijerd 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 Selijerd intrusive rocks reveal their formation from an evolved magma.
Authors and Affiliations
Reza Keshavarzi| Department of geology ,University of Tehran, Iran, Mohammad hasan Bijani| Faculty of Sciences, Islamic Azad University, Khorram abad Branch, Iran, Daryosh Esmaeili| Department of geology ,University of Tehran, Iran, Mehdi Rezaei Kahkhaei| Department of geology , shahrod University, Iran, Mohammad Reza Naghdian| Department of geology , Islamic Azad University, Science and Research Branch, Alborz, Iran, Sasan vosooghi| Faculty of Sciences, Islamic Azad University, Khorram abad Branch, Iran
Keywords
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