ANGULAR UNCONFORMITIES IN THE TURKESTAN-ALAI REGION AND CORRELATED GEOLOGICAL EVENTS OF THE CARBONIFEROUS TIME

Abstract

The Middle-Late Carboniferous events in sedimentation, tectonics, magmatism, and ore formation are correlated using paleotectonic reconstructions for the convergence zone between the Alai and Kyrgyz continents. The pre-Bashkirian folding and angular unconformities originated here during the early collision between lithospheric plates that also gave rise to the continental subduction progressing till the end of the Permian. Interaction of the Alai and Kyrgyz continents with the Karachatyr microcontinent, which was distinguished between them, actuated two subduction-collision zones that functioned until the terminal late Moscovian time being responsible for the collision magmatism and mineral deposition. That interaction also resulted in the two-member (cyclic) structure of the flysch-olistostrome formation. According to the reconstructions, the continental subduction of the Late Paleozoic time was dipping northward.