PETROLOGY AND GEOCHEMISTRY OF GHOSHCHI BATHOLITH, NW IRAN

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ADVAY MEHRAN; JAHANGIRI AHMAD; MOJTAHEDI MANSOUR; GHALAMGHASH JALIL

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2010 | Volume:17 | Issue:4 Page(s): 716-733

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Title

PETROLOGY AND GEOCHEMISTRY OF GHOSHCHI BATHOLITH, NW IRAN

Author(s)

ADVAY MEHRAN | JAHANGIRI AHMAD | MOJTAHEDI MANSOUR | GHALAMGHASH JALIL | Issue Writer Certificate

Keywords

A-TYPE GRANITESQ2

PETROLOGYQ2

GEOCHEMISTRYQ2

SANANDAJ-SIRJAN ZONEQ3

GHOSHCHI BATHOLITHQ3

Abstract

The GHOSHCHI BATHOLITH, ~150 km2 in size is a granitoidic pluton, which intruded the Permian country rocks, in SANANDAJ-SIRJAN ZONE, NW Iran. This granitoidic pluton is covered by Oligocene-Miocene sedimentary rocks known as Qom Formation. The GHOSHCHI BATHOLITH comprises five plutons with following compositions: (a) gabbro-diorite (b) biotite granite, (c) alkali granite, (d) syenites, and (e) aplitic dikes. Gabbro-diorites are the oldest intrusive unit and have interaction zone with biotite granites. These rocks have within-plate tholeiitic nature. Graphic, microgranophyric, and perthitic textures can be found in alkali-feldspar granites, indicate their shallow emplacement depth and hypersolvus nature. Alkali-feldspar granites geochemically are high-k alkaline, metaluminous to mildly peralkaline. The alkali-feldspar granitic rocks contain lower Al2O3, CaO, Fe2O3, TiO2, Ba, Rb, and Sr but higher SiO2, Na2O, K2O, Nb, Th, Y and Zr than biotite granites samples. Alkali-feldspar A-type within-plate granites were presumably formed by high degree of fractional crystallization of mantle derived mafic magmas. Plagioclase and amphibole are two main fractionated minerals. The Alkali-feldspar granites fall into the A1 group (mantle derived) suggesting an anorogenic tectonic setting. Biotite granites and syenites are per aluminous and have crustal source.

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APA: Copy

ADVAY, MEHRAN, JAHANGIRI, AHMAD, MOJTAHEDI, MANSOUR, & GHALAMGHASH, JALIL. (2010). PETROLOGY AND GEOCHEMISTRY OF GHOSHCHI BATHOLITH, NW IRAN. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 17(4), 716-733. SID. https://sid.ir/paper/4198/en

Vancouver: Copy

ADVAY MEHRAN, JAHANGIRI AHMAD, MOJTAHEDI MANSOUR, GHALAMGHASH JALIL. PETROLOGY AND GEOCHEMISTRY OF GHOSHCHI BATHOLITH, NW IRAN. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2010;17(4):716-733. Available from: https://sid.ir/paper/4198/en

IEEE: Copy

MEHRAN ADVAY, AHMAD JAHANGIRI, MANSOUR MOJTAHEDI, and JALIL GHALAMGHASH, “PETROLOGY AND GEOCHEMISTRY OF GHOSHCHI BATHOLITH, NW IRAN,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 17, no. 4, pp. 716–733, 2010, [Online]. Available: https://sid.ir/paper/4198/en

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