岛弧是大洋板块向另一大洋板块下俯冲的产物，它是增生型造山带最为主要的构造单位并且记录了汇聚板块的俯冲过程，因而对恢复增生造山历史发挥着关键的作用。位于东天山地区的大南湖岛弧,是中亚造山带内地壳生长和成矿作用较为显著的地区，然而其演化过程没有被很好的限制。大南湖岛弧出露大量的古生代火山岩，了解其源区性质和成因机制对揭示大南湖岛弧的形成与演化以及成矿动力学机制有着重要意义。本项研究拟对东天山大南湖岛弧的火山岩开展系统的野外地质调查、年代学、岩相学、元素地球化学以及Sr-Nd-O-B同位素地球化学研究。通过深入剖析这些岩石地球化学数据以及整合现有的地质资料，查明其源区性质和岩石成因，进而限制大南湖岛弧的演化过程并为该地区的金属成矿提供制约。

As the primary tectonic units in accretionary orogenic belts, island arcs that generated by subduction of one oceanic plate beneath another, record the subduction processes of convergent plates and thus play an important role in reconstruction of ancient accretionary orogens. The Dananhu arc, located on the Eastern Tianshan, has been considered to be a major site for crustal growth and mineralization in the Central Asian Orogenic Belt, however, the evolutionary process of this arc is not well constrained. The Dananhu arc is characterized by the occurrence of voluminous Paleozoic volcanic rocks, whose source nature and petrogenesis are crucial in deciphering the tectonic evolution of the Dananhu arc during the Paleozoic as well as geodynamic background for metallogenesis in this area. This project focuses on the Dananhu volcanic rocks in the Eastern Tianshan, with a comprehensive study including geological investigation, petrographic, geochemical and Sr-Nd-O-B isotopes. By parsing these geochemical data and synthesizing the existing geological data, this project aims to: (1) understand their source nature and petrogenesis; and (2) constrain the geodynamic process of the Dananhu arc as well as implications for metallogenesis in this area.