RB/SR AND SM/ND ISOTOPE GEOCHEMISTRY AND PETROGENESIS OF MISHU GRANITOID ROCKS, NORTHWEST OF IRAN

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SHAHZEIDI MALIHE; MOAYYED MOHSEN

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Journal: PETROLOGY Year:2016 | Volume:6 | Issue:24 Page(s): 87-113

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Title

RB/SR AND SM/ND ISOTOPE GEOCHEMISTRY AND PETROGENESIS OF MISHU GRANITOID ROCKS, NORTHWEST OF IRAN

Author(s)

SHAHZEIDI MALIHE | MOAYYED MOHSEN | Issue Writer Certificate

Keywords

SHOSHONITIC MAGMATISM

MAGMA MIXING

MISHU ENRICHED MANTLE

CENTRAL IRAN

UROMIEH-DOKHTAR MAGMATIC ZONE

Abstract

Abstract The Mishu granitoids occur in northwest of CENTRAL IRAN and are part of the Khoy-Takab Precambrian metamorphic belt. Based on petrographic studies, this complex comprises several intrusions of granitic rocks ranging in composition from diorite to leucogranite. Geochemical studies indicate these granitic rocks can be divided into the three groups which have undergone a complex history of magmatic process. I-type and S-type granitoidic rocks and leucogranites generally having features typical of medium to high-K calc-alkaline to shoshonitic rocks. Primitive mantle-normalized trace element spider diagrams display enrichment in LILE and depletion in some HFSE which is typical of an enriched mantle source. Rb-Sr and Pb-Pb isotopic data determine the ages of 530±30 and 500±74 Ma for the rocks studied. S-type granites show high (87Sr/86Sr)i values between 0.7081 and 0.7104 and negative eNd values -4.18 to -4.72, whereas I-type granites have a much wider range in eNd of -0.8 to -4.3 and lower (87Sr/86Sr)i of 0.704867 to 0.708046. Initial eNd values for leucogranites range from +0.98 to +1.25. However, their variable Sr and Nd isotope compositions together with major and trace element geochemistry suggest that they were produced by mixing of crustal anatectic melts with variable amounts of mantle-derived basaltic liquids. The present study, therefore demonstrates that these granitic rocks formed on an active continental margin during convergence of Centeral Iran and Alborz-Azerbaijan to Arabian platform during Precambrian (closure of branch of the Proto Tethys Ocean).

Cites

Petrogensis and tectonomagmatic setting of Moghanlu Granitoid (NW of Iran)

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APA: Copy

SHAHZEIDI, MALIHE, & MOAYYED, MOHSEN. (2016). RB/SR AND SM/ND ISOTOPE GEOCHEMISTRY AND PETROGENESIS OF MISHU GRANITOID ROCKS, NORTHWEST OF IRAN. PETROLOGY, 6(24), 87-113. SID. https://sid.ir/paper/196899/en

Vancouver: Copy

SHAHZEIDI MALIHE, MOAYYED MOHSEN. RB/SR AND SM/ND ISOTOPE GEOCHEMISTRY AND PETROGENESIS OF MISHU GRANITOID ROCKS, NORTHWEST OF IRAN. PETROLOGY[Internet]. 2016;6(24):87-113. Available from: https://sid.ir/paper/196899/en

IEEE: Copy

MALIHE SHAHZEIDI, and MOHSEN MOAYYED, “RB/SR AND SM/ND ISOTOPE GEOCHEMISTRY AND PETROGENESIS OF MISHU GRANITOID ROCKS, NORTHWEST OF IRAN,” PETROLOGY, vol. 6, no. 24, pp. 87–113, 2016, [Online]. Available: https://sid.ir/paper/196899/en

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