华南东南部中生代热演化和垂向构造运动：中-低温热年代学制约

华南东南部中生代垂向构造运动对于理解华南板块中生代构造演化及其板块构造动力学机制至关重要。华南东南部地区如今广泛出露的中生代花岗质岩体和曾经出现的下中生界海相盆地，说明中生代以来大规模垂向构造运动的发生。系统的热年代学研究是揭示华南东南部中生代垂向构造运动过程的突破口。本申请拟以华南板块东南部上三叠统–下侏罗统浅海相盆地砂岩地层和区内三叠纪–早侏罗世花岗质岩体为研究对象，分别应用碎屑白云母40Ar/39Ar和碎屑锆石(U-Th)/He测年，和角闪石和黑云母40Ar/39Ar定年、磷灰石裂变径迹分析等中-低温热年代学方法，示踪下中生界盆地及其物源区热史，和早中生代花岗质岩体的冷却剥露历史，恢复早中生代造山带隆升剥蚀过程和下中生界盆地埋藏史，揭示华南东南部中生代热演化和垂向构造运动动态演化过程，为探讨华南中生代构造-热演化及其板块构造动力学机制提供热年代学支撑。

The vertical tectonic movements in southeastern South China is critical to the understanding of the Mesozoic tectonic evolution of South China and its evolving plate tectonic dynamics. The now widely-exposed Mesozoic granitic intrusions, and the Upper Triassic-Lower Jurassic shallow marine basin once appeared in the region, indicate that large-scale vertical tectonic movements have occurred in southeastern South China since the Mesozoic. Systematic thermochronological study will facilitate the establishment of vertical tectonic process of southeastern South China. This study applies detrital muscovite 40Ar/39Ar and detrital zircon (U-Th)/He dating, and the hornblende and biotite 40Ar/39Ar and apatite fission-track analysis, to sandstones from the Upper Triassic – Lower Jurassic shallow marine basins and Triassic – Early Jurassic granites in the southeastern South China, respectively. The results will be utilized to trace the thermal history of the Lower Mesozoic basin and its source area, and the cooling history of the Early Mesozoic granites, in order to reconstruct the exhumation history of the Early Mesozoic orogen and the thermal history of Lower Mesozoic basin. The aim of this study is to decode the thermal evolution and the spatial and temporal distribution of vertical tectonic movements in South China, and to provide thermochronological constraints on the Mesozoic tectono-thermal evolution and plate tectonic dynamics of the southeastern South China.