Strain Geometry and Vorticity Analysis of the Deformed Radiolarian Rocks in the Abade-Tashk Area,the Zagros Suture Zone,Iran

作     者：Roghyeh Tavakkoli Khalil Sarkarinejad Saeede Keshavarz Seyed Rahim Hosseini Roghyeh Tavakkoli;Khalil Sarkarinejad;Saeede Keshavarz;Seyed Rahim Hosseini

作者机构：Department of Earth SciencesSchool of ScienceShiraz UniversityShiraz ***Iran Department of Earth SciencesGraduate University of Advanced TechnologyKerman ***Iran 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2022年第33卷第2期

页      面：525-540页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 

基　　金：KGUT Shiraz University Graduate University of Advanced Technology, GUAT 

主　　题：transpression Zagros suture zone deformed radiolarian microfossils vorticity analysis Abade-Tashk area tectonicstranspression Zagros suture zone deformed radiolarian microfossils vorticity analysis Abade-Tashk area tectonics 

摘      要：Deformation in the Zagros suture zone is a result of the oblique collision of the AfroArabian continent with the Central Iranian microcontinents.Various types of folding and faulting are characteristic features of the study area and indicate the performance of a high strain tectonic regime in this region.To distinguish deformation geometry during the collisional events,strain measurements have been carried out,using the R_(f)/φ method on deformed radiolarian microfossils,in the Zagros suture zone.Based on the results,the strain ellipsoid shape is in the range of general flattening to plane strain(K=0.16 – 1.12).Measured mean kinematic vorticity number(W_(m)) in the deformed radiolarian rocks ranges between 0.50 and 0.87,which implies that exhumation of the Abade-Tashk area was facilitated by a general shear flow(35%simple shear65% and 45%pure shear65%).Kinematic vorticity numbers,the amounts of Octahedral shear strain,the ellipsoid eccentricity,and strain ratios systematically increasing towards the thrust fault.The study of deformation in the study area shows that the Zagros suture zone can be considered as a transpressional zone.