New data on the structure of Permian-Triassic Complex of the Ustyurt Plateau, Uzbekistan

Abstract

The tectonic features of the Permian-Triassic Complex in the Ustyurt Plateau are considered on the basis of up-to-date seismic exploration methods against the background of a regional structural review. The peculiar structural style of the complex under consideration is characterized by the following attributes: the widespread Permian-Triassic faults that control block tectonics; the leading role of grabens various in morphology among negative paleostructures; the critical role of pre-Upper Permian rejuvenated faults in localization of grabens; the predominant extension of the Earth’s crust during origin and development of grabens and subsequent shortening; the appearance of an inversion of the Permian-Triassic graben, deepest in region; the posthumous local uplifts formed in Permian-Triassic and Jurassic-Cenozoic. The morphological typification of graben-like paleotroughs of the transitional stage has been proposed. This stage predates typical platform regime at the young platforms.