Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Tectonic setting of a granitoid pluton in southwest of Neyasar, the central part of Urmia-Dokhtar magmatic arc; petrography, U-Pb geochronology, geochemistry and interpretation of aeromagnetic data approaches

Document Type : Original Research Paper

Authors
Shima Shomali 1
Mansour Ghorbani 1
Mohamad Reza Ghassemi 2
1 Deprtment of Geology, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
2 Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran
10.22071/gsj.2023.410160.2107
Abstract
The Marphioon pluton in the southwest of Neyasar city and central part of Urmia-Dokhtar magmatic arc is among the Neotethyan oceanic lithosphere subduction-related intrusions. We used field evidences, petrography, geochemistry and U-Pb geochronological and aeromagnetic data to suggest a tectonomagmatic scenario for the intrusion. The composition of this circular pluton that has intruded into the Eocene volcano-sedimentary units changes from intermediate rocks to more tonalitic ones. The Marphioon granitoid gives rise to contact aureole zone with different peripheral thicknesses. U-Pb geochronology of a sample from southern part of the pluton suggests that these rocks have crystallized at 18.89±0.20 Ma in Early Miocene (Burdigalian). The rocks belong to medium-K calc-alkaline series and are metaluminous with I-type affinities. In terms of geodynamic setting, this intrusion is classified as volcanic arc granites and active continental margin granites. Qualitative interpretation of aeromagnetic data suggested a dioritic to gabbroic composition due to high magnetic susceptibility. The Marphioon intrusion is strongly tectonized due to faulting. Basement dextral strike-slip faults and their sinistral conjugates are potential mechanisms for its exposure. The pluton appears as two or three segmented bodies due to the presence of minor faults. Based on the aeromagnetic data this intrusion has a dip towards the northeast. It seems that the Marphioon magma in an active continental margin, originated from the partial melting of the lower continental crust with the involvement of mantle-derived melts, where mafic magma in mantle wedge has provided optimal temperature and fluids for this melting in the lower crust. Collectively, the Marphioon intrusion seems to be emplaced during the transition time from subduction to collision in the Urmia-Dokhtar magmatic arc contemporaneous with the closure of the Neotethyan Ocean.
Keywords
Neyasar
Neotethys
Early Miocene
Calk-alkaline
I-type granitoid
Aeromagnetic data
Active continental margin

Subjects

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Scientific Quarterly Journal of Geosciences
Volume 34, Issue 2 - Serial Number 132
Summer 2024, Vol. 34, Issue 2, Serial No. 132
Spring 2024
Pages 107-130