Petrogenesis of Ghoshchi acidic patches, based on zircon U-Pb dating and isotopic analyses, NW Iran

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Asadpour Manijeh; Heuss Soraya

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Journal: GEOSCIENCES Year:2020 | Volume:30 | Issue:117 Page(s): 295-308

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Title

Petrogenesis of Ghoshchi acidic patches, based on zircon U-Pb dating and isotopic analyses, NW Iran

Author(s)

Asadpour Manijeh | Heuss Soraya | Issue Writer Certificate

Keywords

U-Pb datingQ1

Sm-NdQ1

Rb-Sr isotopesQ1

Acidic patchesQ1

Qushchi complexQ1

Abstract

Acidic patches with alkali-granite nature have been intruded within the mafic rocks of the Qushchi complex (70 Km north of Urmia city). This area is northwestern part of the SSz zone with Precambrian basement. These granits have high amounts of K2O and SiO2 (over 70 wt%). Dating by U-Pb age of zircon grains show 303. 4 ± 2. 2 Ma, indicating late Carboniferous-early Permian magma activity. The presence of older cores in some of zircon grains with age between 400 to 600 Ma, indicate presence of older rocks in the study area. The whole-rock isotopic analysis show negative initial  Nd (t) =-1. 3 with TDM = 1. 61. These data provide evidence for partial melting of crust (with Neoproterozoic-Cambrian age) in early Permian. The 87Sr/86Sr = 0. 752348 and ε Nd =-1. 4 of whole rock and Th/U (>0. 5) values in zircons show the involvement of more crustal and less mantle components, during the opening of Neo-Tethys Ocean. Due to the same mineralogical and geochemical composition and homogeneity with Qushchi granite, it is inferred that these patches are genetically related to Qushchi granite and are A type granite.

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APA: Copy

Asadpour, Manijeh, & Heuss, Soraya. (2020). Petrogenesis of Ghoshchi acidic patches, based on zircon U-Pb dating and isotopic analyses, NW Iran. GEOSCIENCES, 30(117 ), 295-308. SID. https://sid.ir/paper/387512/en

Vancouver: Copy

Asadpour Manijeh, Heuss Soraya. Petrogenesis of Ghoshchi acidic patches, based on zircon U-Pb dating and isotopic analyses, NW Iran. GEOSCIENCES[Internet]. 2020;30(117 ):295-308. Available from: https://sid.ir/paper/387512/en

IEEE: Copy

Manijeh Asadpour, and Soraya Heuss, “Petrogenesis of Ghoshchi acidic patches, based on zircon U-Pb dating and isotopic analyses, NW Iran,” GEOSCIENCES, vol. 30, no. 117 , pp. 295–308, 2020, [Online]. Available: https://sid.ir/paper/387512/en

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