苏门答腊（印度尼西亚）中部三叠纪花岗岩成因及其对认识古特提斯南缘大陆地壳形成与演化的制约

Triassic granitoid magmatism on Sumatra in Indonesia was an important magmatic indicator of tectono-magmatic transition from the Paleo-Tethys to Meso-/Neo-Tethys. They show complex temporal-spatial variation, which resulted probably from different petrogenesis processes in variable tectonic settings. This is one of the key to discuss continental formation and tectonic evolution on the southern margin of the Paleo-Tethys. Therefore, an in-depth study on magma source and petrogenetic evolution could play an important role in the reconstruction of the Sundaland and southern Paleo-Tethyan tectonic evolution.. The proposal focuses on petrogenesis and tectonic settings of the Triassic granitoids in the middle Sumatra. The different magmatic episodes would be divided by detailed field geology and zircon U-Pb dating. By integrating with regional geology, whole-rock geochemical and Sr-Nd isotopic analyses and zircon Hf-O isotopic analyses, this framework will further discuss their magma source, petrogenetic evolution, emplacement mechanism and tectonic settings as well as their tectonic implications in the early Mesozoic tectonic evolution of the Paleo-Tethys. These results, combined with a comparison on coeval granitoids in different tectonic belts from the Southeast Asia, could shed a new light on the tectono-magmatism of the southern Paleo-Tethys.

苏门答腊（印度尼西亚）三叠纪花岗质岩浆作用蕴含着东南亚巽他大陆古生代向中新生代构造-岩浆演化的重要信息，它们显示了复杂的时空变化，可能揭示不同构造背景下的岩浆成因演化过程，是探讨该区古特提斯南缘大陆地壳形成与演化的关键之一。因此，对该区三叠纪花岗岩开展深入研究，查明其源区特征和岩浆的演化过程，对于重塑巽他大陆的聚合过程及古特提斯南缘的构造演化具有重要的科学意义。.本项目拟以苏门答腊中部三叠纪花岗岩为研究对象，主要针对岩浆成因演化和构造环境两个关键问题，进行详细的野外地质研究和锆石U-Pb定年，划分三叠纪花岗岩形成的岩浆期次；通过系统的地球化学、Sr-Nd同位素和锆石Hf-O同位素研究，并结合区域地质背景，确定不同期次的岩浆性质、成因和侵位机制及岩浆的演化过程和构造背景。综合分析对比东南亚相关构造带三叠纪花岗岩的成因联系和构造关系，为揭示古特提斯南缘早中生代大地壳形成和演化过程提供依据。

苏门答腊（印度尼西亚）三叠纪花岗质岩浆作用蕴含着东南亚巽他大陆古生代向中新生代构造-岩浆演化的重要信息，它们显示了复杂的时空变化，可能揭示不同构造背景下的岩浆成因演化过程，是探讨该区古特提斯南缘大陆地壳形成与演化的关键之一。因此，对该区三叠纪花岗岩开展深入研究，查明其源区特征和岩浆的演化过程，对于重塑巽他大陆的聚合过程及特提斯南缘的构造演化具有重要的科学意义。.本项目以苏门答腊中部三叠纪花岗岩为研究对象，主要针对岩浆成因演化和构造环境两个关键问题，进行了详细的野外地质研究和锆石U-Pb定年，确定三叠纪花岗岩形成的时代；通过系统的地球化学、锆石Hf同位素研究，并结合区域地质背景，揭示出研究区从晚三叠世开始发育中/新特提斯演化相关的三期新生弧岩浆作用，成果发表在Geology和Tectonics。