ТЕКТОНИЧЕСКИЕ СТРУКТУРЫ ЮГО-ВОСТОЧНОГО ФЛАНГА ЗОНЫ СОЧЛЕНЕНИЯ ИНЬЯЛИ-ДЕБИНСКОГО СИНКЛИНОРИЯ И ОМУЛЕВСКОГО ТЕРРЕЙНА

Abstract

For the first time in the studied region, a sharp angular and azimuthal unconformity was found between intensely deformed Middle Jurassic clastic deposits and Upper Jurassic volcaniclastic rocks. Two stages of deformations are established. The complex intense folding of the Middle Jurassic rocks has a northwestern strike, while the superimposed simple large open folds by the Upper Jurassic rocks are oriented in the sub-latitudinal direction. It was established that structural paragenesis, represented by interlayer faults, thrusts, normal faults, and strike slip faults was formed in a single stress field with the folding of the first stage of deformations. Intensive folding occurred in the region at the end of the Middle Jurassic or at the beginning of the Late Jurassic, which led to the formation of the modern structural plan of the northwestern strike. The accumulation of Late Jurassic volcaniclastic rocks and the intrusion of subvolcanic rocks occurred already on / into the deformed sediments of the Middle Jurassic.