西昆仑早古生代增生楔造山与陆壳增生

A Paleo-ocean which is referred to as "Proto-Pacific" developed in Pt3~Pz1 in western Kunlun Mts. Along the Xinzang highway (from Yecheng, Xinjiang to Shiquanhe, Tibet), Early Paleozoic accretionary wedge orogeny belt is composed of subduction-type ductile shear zone, undeformed potassic Kudibei granite, schistose "128" granodiorite, fore-arc basin volcanics and flyshes. They have temporally and spatially relation: large-scale shear zone contains ophilite blocks and intruded by lamprophyres dyke and Kudabei granite, "128" granite formed by the subduction shearing process. Kudabei granite, "128" granite and ductile zone are mainly made from the accretionary complex rocks. The metamorphic age of accretionary complex is 426-451Ma with 40Ar/39Ar method by dating metamorphic genetic biotite of mica schist and amphibole of plagioclase-amphibole gneiss.. These data provide constraints on the Early Paleozoic tectonic evolution in western Kunlun: Proto-Pacific developed in early Paleozoic with passive continental sedimentary building up in Pt3~Pz1; About in Ordovician, the subduction of Proto-Tethys resulted active margin volcanism, and the accretionary wedge complex was building up with some blocks of oceanic materials. During the shearing process, the sedimentary rocks and basalt suffered intense ductile strain and green schist metamorphism and the 128 granite formed; In late Early Paleozoic, the subduction ceased with a tectonic reverse and the lamprophyres and Kudibei granite intruded. However, it is inferred that there is no collision happened until Mesozoic Tarim collided with Qiangtang. .The accretionary wedge complex reworked by ductile shearing process and melting to granite provide a mode of lateral growth of continental crust..

以造山系统动力学研究为主线，综合运用地质学、地球化学、地球物理的方法和手段，对西昆仑早古生代增生楔进行详尽的野外观察和室内分析，查明各地质体之间的时空成生关系，揭示增生楔造山的深部动力学过程，建立增生楔造山模型，探讨陆壳侧向生长理论。