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Journal of Applied Sciences

Year: 2008 | Volume: 8 | Issue: 23 | Page No.: 4238-4250
DOI: 10.3923/jas.2008.4238.4250
The Role of Shear Zone on the Emplacement of Malayer Granitoid Rocks, NW Iran
V. Ahadnejad, M.V. Valizadeh and D. Esmaeily

Abstract: Malayer complex is emplaced within the early to middle Jurassic regional metamorphic rocks which consist of slate, phyllite and schist so called Hamadan phyllite in the Sanandaj-Sirjan Zone (SSZ). The Sanandj-Sirjan Zone is produced by oblique collisional event between Arabian plate and Central Iran microcontinent. The Malayer plutonic complex, in the Northern Sanandj-Sirjan Zone (Western Iran), is a composite, roped-shaped intrusive body, range from alkali granite, syenogranite, monzogranite, granodiorite, to tonalite in composition with high-K calc-alkaline affinity and some little massives of basic-to-intermediate, gabbro and diorite that have different geological history. They typically have angular to spherical-shaped magmatic and metamorphic enclaves. A persistent control on the emplacement of the various suites by a nearby oblique, strike-slip pressional is suggested by several features. Among them are: (a) shapes of individual intrusions and their location in transpressional sites (b) metric to decimetric-thick sheets emplaced along shear bands (c) fold axial surfaces (d) transitions between viscous- to solid-state fabrics in the pluton and (e) bearing the same orientation and kinematics as in their country rocks. Furthermore, intergrowth textures such as myrmekite and perthite, mylonitic granites, complex deformation and elongated shape imply injection of melt along the high-strain shear zone.

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How to cite this article
V. Ahadnejad, M.V. Valizadeh and D. Esmaeily, 2008. The Role of Shear Zone on the Emplacement of Malayer Granitoid Rocks, NW Iran. Journal of Applied Sciences, 8: 4238-4250.

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