STRUCTURAL ANALYSIS, ORIGIN AND DEFORMATION CONDITIONS OF DUCTILE SHEAR ZONES IN DEHNOW GRANITOIED PLUTON-WEST OF MASHHAD

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RAHIMI BEHNAM; ALIZADEH HOSSEIN

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2010 | Volume:18 | Issue:3 Page(s): 0-0

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Title

STRUCTURAL ANALYSIS, ORIGIN AND DEFORMATION CONDITIONS OF DUCTILE SHEAR ZONES IN DEHNOW GRANITOIED PLUTON-WEST OF MASHHAD

Author(s)

RAHIMI BEHNAM | ALIZADEH HOSSEIN | Issue Writer Certificate

Keywords

DUCTILE SHEAR ZONEQ3

DEHNOW DIORITEQ3

MASHHADQ2

Abstract

The MASHHAD ophiolitic and metamorphic complex was intruded by MASHHAD granitoids in three different episodes of magmatisms. Dehnow pluton with diorite-granodiorite composition was intruded in earliest stage of magmatism in late Triassic (Norian, 215±4My).This pluton is cut across by the NW-SE trending DUCTILE SHEAR ZONEs which are dominated by an intense ductile deformation. The rocks of the Dehnow pluton along the shear zones are converted into protomylonite, mylonite and ultra-mylonite with steeply dipping mylonitic foliation and gently plunging stretch lineation on it. Kinematic analysis of shear sense indicators such as S-C fabrics, asymmetric folds, asymmetric porphyroclasts, mica fish and domino-type fragmented porphyroclasts reveal that the ductile deformation is related to right lateral reverse slip that may describe by a transpressional deformation regime. the minerals in the mylonitic rocks shows variable microstructures such as patchy to crosshatch undulose extinction, shear fracture, deformation lamellae, subgrains formation, bulging dynamic recrystalization (BLG) and subgrain rotation recrystalization (SGR) in quartz grains, also subgrain formation , deformation twins, flame-shaped prethities , dynamic recrystalization (BLG) in feldspars , all indicated that the ductile deformation have occured in 300-500oC (upper green schist and lower amphibolites facies conditions). Age and cross cutting relations between various lithological units in the study area revealed that the DUCTILE SHEAR ZONEs were formed during Cimmerian orogeny between Norian to Early Jurassic age.

Cites

STRUCTURAL ANALYSIS AND DEFORMATION CONDITIONS IN THE KUH-E-SARHANGI SHEAR ZONE OF THE DEH ZAMAN GRANITE, NW OF THE LUT BLOCK

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APA: Copy

RAHIMI, BEHNAM, & ALIZADEH, HOSSEIN. (2010). STRUCTURAL ANALYSIS, ORIGIN AND DEFORMATION CONDITIONS OF DUCTILE SHEAR ZONES IN DEHNOW GRANITOIED PLUTON-WEST OF MASHHAD. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 18(3), 0-0. SID. https://sid.ir/paper/358933/en

Vancouver: Copy

RAHIMI BEHNAM, ALIZADEH HOSSEIN. STRUCTURAL ANALYSIS, ORIGIN AND DEFORMATION CONDITIONS OF DUCTILE SHEAR ZONES IN DEHNOW GRANITOIED PLUTON-WEST OF MASHHAD. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2010;18(3):0-0. Available from: https://sid.ir/paper/358933/en

IEEE: Copy

BEHNAM RAHIMI, and HOSSEIN ALIZADEH, “STRUCTURAL ANALYSIS, ORIGIN AND DEFORMATION CONDITIONS OF DUCTILE SHEAR ZONES IN DEHNOW GRANITOIED PLUTON-WEST OF MASHHAD,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 18, no. 3, pp. 0–0, 2010, [Online]. Available: https://sid.ir/paper/358933/en

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