Microstructure analysis of Zarab region, south of Kerman

Geotechnical Geology

دوره 4، شماره 4، اسفند 2008، صفحه 259-270   

نوع مقاله: Original Research

نویسندگان

Farnaz Iranmanesh¹؛ Amir Shafiei Bafti^{* 2}؛ Sohrab Shahriari³؛ Mohsen Pourkermani⁴

¹Department of Geology, Faculty of Basic Sciences, Sciences & Research Branch, Islamic Azad University, Tehran, Iran

²Department of Geology, Islamic Azad University - Zarand Branch, Zarand, Iran

³Department of Geology, Faculty of Earth Science, Shahid Beheshti University, Tehran, Iran

⁴Department of Geology, Islamic Azad University - North of Tehran, Tehran, Iran

چکیده

Zarab region situated in south of Baft city and Northern Boundary of Sanandaj-Sirjan zone. Petrographical studies indicate the metamorphism grade of Rock units is about of moderately green schist facies and contain of: orthogenesis, Marble and abundance schist>s in mentioned region. flow structures are seen In the mentioned rock unites specially in marble rock unite. Microstructural studies show various microstructures as like S-C structures, σ and δ structures Mica Fishes in mica schist>s which those indicate dextral shear stress sense, which caused Microstructures. The amounts of tension strains in normal section that prepared from oriented samples indicate prolate form strain ellipsoid parallel to schistosity fabrics. Field studies show, which the thrust faults, have a dextral movement (co orientation with microstructures shear sense), similar orientation and slip movement and absence of fault plan erosion. Varieties between faulting deformation (brittle deformation) and shear sense of microstructures (ductile deformation), reveal two deformation phase with a nonconcurring deformation time.

کلیدواژه‌ها

Sanandaj-Sirjan Metamorphic zone؛ Microstructures؛ Strain analysis؛ Relationship between metamorphism- deformations