东昆仑南部构造带俯冲增生作用与构造过程

增生型造山作用因其复杂的构造过程，因而成为探讨多块体（小陆块）拼合方式、大陆侧向增生的良好载体，也是发展板块构造、构建大陆构造理论的关键。本申请拟瞄准特提斯北缘多陆块拼合机制关键科学问题，选择东昆仑造山带南部增生杂岩带，进行多学科研究。重点研究：1）增生杂岩带内关键岩浆事件的性质、时代及构造环境；2）增生杂岩带内不同构造岩块、混杂基质的性质、年龄、变形和变质作用；3）增生杂岩带内不同构造-地层系统、不整合性质及构造意义；4）重建增生过程的U-Pb、40Ar/39Ar、ZFT和AFT构造-年代学格架；5）恢复昆南构造带俯冲增生时-空精细过程，厘定原特提斯与古特提斯构造关系，探讨特提斯北缘构造演化过程。该研究不仅能够成为长期俯冲-增生造山作用与过程研究的典范，而且是确定特提斯北部构造转换的关键。对于探索岗瓦纳大陆裂解-劳亚大陆增生、东亚大陆的聚合方式和过程等重大科学问题具有重要的意义.

Because of its complex tectonic process, accretionary orogeny has become a good carrier for discussing the amalgamation of multiple blocks (small blocks) and lateral accretion of continents. It is, therefore, the key to developing the Theory of Plate Tectonics and establishing a Continental Tectonic Theory. Aiming at the key scientific issues of the multi-block assembling mechanism and process in the northern margin of Tethys, this application selects the Southern Kunlun Accretionary Belt (SKAB) , East Kunlun orogenic belt for multi-disciplinary research, which will mainly focus on: (1) Investigations on the petrogenesis, geochronology and tectonic setting of magmatic rocks in the SKAB; (2) Research on the nature and timing of deformation and metamorphic processes of individual tectonic blocks and matrices in the SKAB; (3) Systematic identification of the tectonic process of different tectonic-stratigraphic units, the tectonic implications of a series of unconformities in the SKAB; (4) Establishing a detailed geochronological framework for the tectonic evolution of the SKAB by means of multiple minerals U-Pb, 40Ar/39Ar, ZFT, AFT and U-Th/He systematic isotopic dating ; (5) Reconstruction the detailed temperal-spatial accretionary process of the SKAB, identifying the tectonic correlation of the Proto-Tethys and Paleo-Tethys, and exploring the tectonic evolutionary history along the northern margin of Tethys. This project can not only serve as a model for an investigation of long-term subduction-accretionary orogeny, but also be the key to understanding the tectonic transition from Proto-Tethys and Paleo-Tethys in northern Tethys domain. It is also of great significance for exploring the tectonic regime and dynamics of Gondwana breakup and accretion to Laurasia, as well as the convergence of the East Asian Continent.