Thrust Structure and Bidirectional Paleocurrent in the Jingzhushan Formation during the Late Cretaceous in the Nyima Basin, Tibet Plateau, China: Approach of Magnetic Fabric and Zircon Chronology

(1) Background: The widely developed thrust structures in the Jingzhushan Formation of late Cretaceous Nyima Basin are related to collision which leads orogeny between Lhasa and Qiangtang blocks. Clarifying tectonic properties is great significance characterize evolution block block. (2) Methods: Combined with mineralogy petrology U-Pb zircon dating extrusive rocks, a detailed magnetic fabric test rock experiment were carried out on red sandstones Late Basin. (3) Results: sedimentary fabrics at three sampling locations southern part basin paleocurrents. strained one site north, including pencil-like tensile linear fabrics, SE-NW stress. average susceptibility value sandstone lower than that fabric, its size controlled by mica paramagnetic minerals. Ferromagnetic minerals magnetite or hematite. In addition, age from matches eruptive Coqen Basin, 92 Ma. (4) Conclusions: near fault, can explain basin. was an ocean-continent transitional foreland under background arc-arc “soft collision”.