在威尔逊旋回中，大洋岩石圈俯冲起始和终止是两个非常重要的时间节点，分别对应于增生造山过程和碰撞造山作用的开始。因此，造山带是回溯地质历史中洋陆相互作用和构造格局转变的过程最重要的窗口，对大洋岩石圈俯冲起始和终止这两个时间节点的限定就显得尤其重要。.除理论探讨外，如何通过造山带中地质记录限定大洋岩石圈俯冲起始是一个非常现实的问题。以西太平洋俯冲起始在IBM和新喀里多尼亚弧前产生的地质特征作为参考实例，通过比较分析中亚造山带西南部的地质资料，本项目提出，西准噶尔南部是中亚造山带中研究古亚洲洋西南部俯冲起始的最佳区域，如果能够确定埃迪卡拉纪—寒武纪SSZ型蛇绿岩、蛇纹岩基质中产出的弧岩浆岩和高压/低温蓝片岩—榴辉岩相变质岩的空间分布，建立它们的年龄序列，就能够以其中时代最老、时空关系密切、成因相互关联的SSZ型蛇绿岩、弧岩浆岩和高压/低温变质岩作为三重标志组合，严格约束古亚洲洋西南部的俯冲起始。

In the Wilson cycle，there are two major time nodes for evolution of oceanic lithosphere. The subduction initiation of oceanic lithosphere is in correspondence to the onset of accretionary orogeny, followed by the subduction cessation after long-term subduction, when the accretionary orogeny is switched to the collisional orogeny. Therefore, orogens are the best sites for reconstructing the processes of ocean-continent interaction and transformation during geologic history, in which it is extremely important to constrain the timing of the subduction initiation and cessation of oceanic lithosphere..In addition to investigations in theory, the subduction initiation, like the subduction cessation, is an important event in an accretionary orogen, but it is puzzling what geologic features preserved in an orogen can be used as constraints on the event. Fortunately, the forearcs of the Izu-Bonin-Mariana and New Caledonia in western Pacific, which are characterized by the trinity of SSZ-type ophiolitite and almost coeval arc magmatic rocks and slightly younger HP/LT blueschist-eclogite facies metamorphic rocks, are currently the best examples for reference to the southwestern Central Asian Orogenic Belt, and the southern part of the West Junggar, NW China, is the best site for exploring the subduction initiation of the southwestern Paleo-Asian Ocean, where the Ediacaran-Cambrian SSZ-type ophiolitic gabbroids and arc magmatic and HP/LT metamorphic rocks are dispersed in serpentite matrix. This work aims at determining the spatial distribution, age sequence and genetic relationship of SSZ-type ophiolitic, arc magmatic and HP/LT metamorphic rocks. Finally, the oldest group of SSZ-type ophiolitic, arc magmatic and HP/LT metamorphic rocks will be used to constrain the subduction initiation of the southwestern Paleo-Asian Ocean.