Geochemistry, Sr-Nd isotope data and petrogenesis of the Marziyan granitoid, Sanandaj-Sirjan Zone, western Iran

Date

2015-04-01

Author

Datvishi, E.
Khalili, M.
Toksoy Köksal, Fatma
Köksal, Serhat
Beavers, R.

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The Marziyan granitoid is part of the widespread granitoid bodies in the Sanandaj-Sirjan Zone. It intruded Mesozoic regional metamorphic rocks of this belt and is composed of leucogranite and subordinate granite. The mineralogy of the granitoid is dominated by quartz, K-feldspar, plagioclase, biotite, muscovite, garnet, tourmaline and accessory apatite, zircon and ilmenite. The peraluminous nature of these rocks is manifested by high molar A/CNK ratio (>1.1), and the presence of garnet and minor sillimanite. Strong enrichment in alkalies and depletion in high field strength elements as well as high initial Sr-87/Sr-86 ratios (>0.71) and low initial epsilon Nd(t) values (-0.8 to 3.7) suggest that the melt was derived from a metapelitic source. Part of the heat required for the formation of the Marziyan granitic magma was supplied by shear heating imposed by regional tectonic forces. The granitoids exhibit a high-K and calc-alkaline nature and show features typical of syn-collisional magmatic intrusions. Based on geological, mineralogical and geochemical data, we suggest that magma intrusion took place at mid to upper crustal levels possibly under vapour-absent conditions during the collision of the Afro-Arabian continental plate with the Central Iranian microplate.

Subject Keywords

Granitoid, Peraluminous, Syn-collision, Marziyan, Sanandaj-Sirjan Zone, Iran

URI

https://hdl.handle.net/11511/33166

Journal

NEUES JAHRBUCH FUR MINERALOGIE-ABHANDLUNGEN

DOI

https://doi.org/10.1127/njma/2015/0281

Collections

Department of Geological Engineering, Article

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Citation Formats

E. Datvishi, M. Khalili, F. Toksoy Köksal, S. Köksal, and R. Beavers, “Geochemistry, Sr-Nd isotope data and petrogenesis of the Marziyan granitoid, Sanandaj-Sirjan Zone, western Iran,” NEUES JAHRBUCH FUR MINERALOGIE-ABHANDLUNGEN, pp. 195–210, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/33166.