Signs of Polychronous Deformations in Carbonate Rock Microstructures of the Katav–Yuryuzan Transpression Zone (Southern Urals)

The Katav-Ivanovsk transpression zone experienced at least two stages of tectonic deformations and the sequence of deformations was approximately the same throughout the entire zone from the Bakal–Satka fault in the south to the Suleya fault in the north. Three stages of the development of structural parageneses were identified. The parageneses of the first and the second stages were formed in a pure shear environment, while the paragenesis of the third stage formed in a simple shear environment. Stylolites (S 1 ) occur, arranged parallel to the bedding, and mineral veins (V 1 ) in the paragenesis of the first stage. The paragenesis of the second stage includes stylolites (S 2 ), mineral veins (V 2 ), and intergranular cleavage (S 2 ). The paragenesis of the third stage includes schistosity (S 3 ), mylonites (S 3 ), cataclasites, mica sheets (SC-structures), and the rotation structures of porphyroblasts.