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Intercontinental response to variations in the Arabia-Eurasia Plate convergence,calcite e-twin evidence of the Kuhbanan Fault system,central Iran

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Journal of Mountain Science 2021年第5期18卷 1321-1339页

作者： Sara ESMAEILIAN Saeed MADANIPOUR Shahram SHAAFIEIBAFTI Yasamin EBRAHIMI Department of Geology Tarbiat Modares UniversityTehran 14115-175Iran Department of Geology Shahid Bahonar UniversityKerman ***Iran

Variations in the plate convergence direction have generally reflected on the kinematics of the major fault zones developed in the intercontinental parts of the collision *** Kuhbanan Fault system is one of the most important intercontinental faults in the Arabia-Eurasia collision zone with a dextral strike slip *** fault system is composed of three fault strands including Kuhbanan,Bazargan,and Kerman *** we used calcite e-twin analysis of the vein samples developed in these fault zones to reconstruct deformation condition and the paleodifferential stress direction and magnitude at the Kuhbanan Fault *** results represent 190°C-200°C of the deformation temperature and related 5–6±1 km of deformation depth at the Kuhbanan Fault *** paleodifferential stress magnitude in the Kuhbanan Fault system using e-twin parameters ranges from 169-196 MPa similar to the inner parts of the orogenic *** the data set of the Kuhbanan Fault system with previous studies at the Zagros orogen represents an increase of deformation depth and paleodifferential stress magnitudes from the foreland of the Zagros orogen to its hinterland and finally northward around the Kuhbanan Fault system in the central iranian *** have also proposed a shift of the stress direction from paleo NE to recent N directed by comparing paleostress direction deduced from the calcite e-twin and recent stress direction calculated from GPS and earthquake data analysis around the Kuhbanan Fault *** kinematics change due to plate reorganization is in agreement with the observed regional variation in convergence direction all in the Arabia-Eurasia collision zone.

关键词： Kuhbanan Fault system Calcite e-twin analysis Paleodifferential stress Arabia Eurasia collision central iranian blocks Paleostress analysis

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