江汉盆地及其周缘碎屑岩热年代学及其对长江三峡形成演化的约束

长江是中华民族的母亲河，备受地学界和大众关注。然而，关于“长江东流水系形成于何时”这一关键科学问题却一直存在重大争议，持续了将近一个世纪。研究针对长江三峡段的形成演化及其在江汉盆地的沉积响应这一科学问题，以江汉盆地内钻井碎屑岩和长江三峡河流两岸的基岩为主要研究对象，开展碎屑锆石U-Pb和(U-Th)/He、磷灰石裂变径迹、磷灰石(U-Th)/He等定年分析，并与碎屑岩岩相学特征、碎屑成分、重矿物组成和前人沉积相及构造地貌等研究相结合，通过多种技术方法的综合应用和相互结合、相互验证，厘清长江东出三峡后进入江汉盆地的源-汇关系，揭示长江三峡段的形成演化及其成因机制，探索精确限定复杂沉积物源区的多年代学重建技术，为新生代亚洲地区重大构造事件及其资源环境效应的研究提供基础数据和重要参考。

The Yangtze River is the mother river of the Chinese nation, which attracts much attention from the geo-academia and the public. However, “When the Yangtze River was formed” has been strongly debated over a century. Especially there is no consensus on timing of the Yangtze channeling through the Three Gores area. In this study, drilling clastic rocks in Jianghan Basin and bedrocks on both sides of the Yangtze Three Gorges River are chosen as the research objects. The key technologies mainly are zircon U-Pb and (U-Th)/He dating, apatite fission track thermochronology, apatite (U-Th)/He dating and so on. This study will integrate these multiple geochronology techniques and the other methods including clastic lithofacies, clastic composition, heavy mineral composition to clarify the source-to-sink relationship of the Yangtze River east-flowing the Jianghan Basin after incision of the Three Gorges. This study attempts to reveal the formation and evolution of the Three Gorges section of the Yangtze River and its genetic mechanism. Reconstruction techniques for precisely defining complex sediment provenances will be explored. The study can provide basic data and important reference for further understanding of major tectonic events and their resource and environmental effects in Cenozoic Asia.