Subsidence characteristics of Turpan Basin nd its tectonic implications

摘要

The Turpan Basin, a back-arc basin formed during Late Permian, underwent first thermal subsi- dence and then flexure subsidence. The thermal subsidence took place during Late Permian and Early Triassic follow- ing the period of magmatic activities in this region. The flexural subsidence was throughout the Middle triassic to Ear- ly Tertiary induced by orogenic movements which produced periods of high subsidence rates. Accelerated subsided pe- riods occurred during Late Triassic/Early Jurassic, Late Jurassic, terminal Jurassic/initial Cretaceous, and terminal Cretaceous/early Cenozoic, indicating the effect of the collision and accretion onto the south Asian continental margin Of the Qiangtang Block in Late Triassic/Early Jurassic, the Gangdise Block in Late Jurassic/initial Cretaceous, and the Indian subcontinent in the terminal Cretaceous/early Cenozoic.