MECHANISM OF DEFORMATION AND THE ASSOCIATED MICROSTRUCTURES IN THE BASIC MYLONITIC ROCKS, NW URUMIEH

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MOHAMMADIHA K.; SABZEHIE M.; GHAHRAIE POUR M.; RADFAR J.

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Journal: GEOSCIENCES Year:2012 | Volume:22 | Issue:85 Page(s): 47-54

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Title

MECHANISM OF DEFORMATION AND THE ASSOCIATED MICROSTRUCTURES IN THE BASIC MYLONITIC ROCKS, NW URUMIEH

Author(s)

MOHAMMADIHA K. | SABZEHIE M. | GHAHRAIE POUR M. | RADFAR J. | Issue Writer Certificate

Keywords

BASIC MYLONITIC ROCKSQ2

DEFORMATIONQ2

BRECCIATED ZONESQ2

METAMORPHISMQ2

URUMIEHQ2

Abstract

A large widespread outcrop of granitoid - mylonitic gabbros complexes is observed in northeastern part of Serow, NW Iran. Those rocks were considered as Precambrian gneiss and metamorphic rocks (Haghipour and Aghanabati, 1977), or alternatively, a complex of acidic to basic igneous rocks which have undergone intense DEFORMATION and dynamic METAMORPHISM by shearing (Mohammadiha, 2000; Mohammadi Torkabad, 2001). The BASIC MYLONITIC ROCKS in the studied area are simply composed of plagioclase, hornblende, actinolite, chlorite, and epidote. They display minor remains of primary pyroxenes which are largely replaced by amphibole. Feldspars have been altered to epidote, and secondary plagioclase (more sodic) and roughly sericite. There are some gabbros with clastic and lentiform fabric which were not affected by dynamic DEFORMATION in the shear zone. Cataclastic flow, micro fracturing, dislocation creep, recovery, diffusion creep, grain boundary sliding and pressure dissolution are the dominant DEFORMATION mechanisms influenced the complexes. The consequent structures are foliation, lineation, undoluse extinction, porphyroclasts with core-mantle structure, micro fractures parallel and unparallel with brecciation, mechanical twining, mica fish structure, banded differentiated structure and kinked foliation. We conclude that the whole observed evidences demonstrate a major dynamic DEFORMATION in a brecciated zone in the studied area.

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APA: Copy

MOHAMMADIHA, K., SABZEHIE, M., GHAHRAIE POUR, M., & RADFAR, J.. (2012). MECHANISM OF DEFORMATION AND THE ASSOCIATED MICROSTRUCTURES IN THE BASIC MYLONITIC ROCKS, NW URUMIEH. GEOSCIENCES, 22(85), 47-54. SID. https://sid.ir/paper/31797/en

Vancouver: Copy

MOHAMMADIHA K., SABZEHIE M., GHAHRAIE POUR M., RADFAR J.. MECHANISM OF DEFORMATION AND THE ASSOCIATED MICROSTRUCTURES IN THE BASIC MYLONITIC ROCKS, NW URUMIEH. GEOSCIENCES[Internet]. 2012;22(85):47-54. Available from: https://sid.ir/paper/31797/en

IEEE: Copy

K. MOHAMMADIHA, M. SABZEHIE, M. GHAHRAIE POUR, and J. RADFAR, “MECHANISM OF DEFORMATION AND THE ASSOCIATED MICROSTRUCTURES IN THE BASIC MYLONITIC ROCKS, NW URUMIEH,” GEOSCIENCES, vol. 22, no. 85, pp. 47–54, 2012, [Online]. Available: https://sid.ir/paper/31797/en

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