THREE-DIMENSIONAL DEFORMATION ALONG THE ALTYN TAGH FAULT ZONE AND UPLIFT OF THE ALTYN MOUNTAIN, NORTHERN TIBET

摘要

he convergence between India and Eurasia is partly accommodated by motion of a few large blocks along strike|slip faults. About 1800km long Altyn Tagh fault strikes in N60～80°E and allows the northeastward displacement of the Tibet plateau relative to the Tarim. The Altyn Tagh fault zone is a typical transpressional fault zone, characterized by blocks rotation and crustal shortening and vertical extrusion of blocks within the Altyn Tagh strike|slip system. Differences of three|dimensional deformation and configuration of the active structures are recognized at different segment of the Altyn Tagh fault zone.1 Structural configuration of the Altyn Tagh fault zone;In the Altyn Tagh strike|slip fault zone, the assemblage pattern of the (active) faults is in the form of parallel plumes, especially in the eastern and the western segments of the Altyn Tagh fault zone. These plumes structures in the eastern segment are assembled by string|like left lateral strike|slip fault and broom|like thrusting faults, and in the western segment by arc|like left lateral strike|slip faults along with thrusting faults and normal faults. In the middle segment of the Altyn Tagh fault zone, the structures are characterized by the string|like left lateral strike|slip faults in the center and reverse thrusting faults on the two sides.