The positive flower structure of the Yalchigulovsky fault in the Southern Urals
The structure and kinematics of the Yalchigulovsky fault, which relates to the longitudinal faults of the second order of the zone of the Main Ural Fault in the Southern Urals, are characterized. The results of the structural-paragenetic and tectonophysical analysis of small structural forms (duplexes, fractures, drag folds) developed in the Yalchigulovsky fault zone are given. The structural constructions are based on the data of detailed mapping of the surface of the fault zone. It was established that the Yalchigulovsky fault is a transpressive right strike-slip fault, which has a positive flower structure at the latitude of Karagaykul Lake. The axial part of the flower structure is formed by subvertical reverse faults with dextral strike-slip component. On the flanks, packages of tectonic plates are developed, which are bounded by thrusts with dextral strike-slip component and a gentle dip toward the center of the fault zone. According to the results of tectonophysical reconstructions, two phases of right-sided movements along the Yalchigulovsky fault were identified, which occurred under conditions of near-horizontal compression of the north-east-southwest direction. It is shown that a transressive right strike-slip fault was formed in the Late Paleozoic at the collisional stage of development of the zone of the Main Ural Fault.