龙门山的逆冲-推覆和隆升：来自于山前飞来峰的年代制约

作为青藏高原的东部边界，龙门山逆冲推覆构造带被认为是世界范围内大陆动力学新理论、新观点和新发现的重要源区。以往的研究结果揭示龙门山分别经历了中生代和新生代的逆冲推覆和构造隆升，由此引发了对其现今巨大地貌落差的形成过程和机制的强烈争论。龙门山中央断裂带（映秀-北川断裂）与前山断裂（灌县-安县断裂）之间分布着数十个飞来峰，被认为是推覆构造的外来体；而在它们的底部还堆积了数千米厚的中生代与新生代的陆源碎屑沉积岩，代表了逆冲推覆之前的原地系统以及逆冲推覆过程中的沉积响应。因此，这些外来推覆体的侵位过程为研究青藏高原东缘的隆升历史和动力学机制提供了全新的研究视角。本研究拟通过断层泥伊利石年代学技术和物源示踪手段来厘定龙门山飞来峰的形成时间和就位机制，得到的结果将有效制约龙门山的隆升历史，从不同的角度认识青藏高原东缘的隆升过程，及其整体性和差异性，从而能更深刻的阐明青藏高原东缘形成的动力学机制。

As the eastern boundary of Tibetan Plateau, Longmen Shan thrust-nappe belt is considered as one of the important craddles for new theories, new models, and new discoveries in continental dynamics . Previous studies indicate that the Longmen Shan experienced thrust-nappe and uplift during Mesozoic and Cenozoic, respectively, which resulted in a great debate on the formation processes and mechanisms of its peculiar geomorphology. Currently tens of klippen composed of Devonian to mid-Triassic calcite overlie Late Triassic to Jurassic continental deposits between Yingxiu-Beichuan and Guanxian-Anxian fault zones, which are considered as the allochthon. In addition, continental clastic rocks of a few thousand meters thick are filled under the klippen, representing the autochthon system before thrusting and the sediments corresponding to the thrust-nappe. The emplacement of these klippen in the foreland basin therefore provides new objects allowing study of the uplift history of east Tibet. This project aims on understanding the uplift history of Longmen Shan by dating the Longmen Shan klippen via gouge illite thermochronological techniques. Combined with sediment provenance analysis, we intend to provide additional evidence for the uplift process of east Tibet. By Comparison with different parts of the Longmen Shan thrust belt, we hope to eventually understand the orogenic mechanism of formation of the eastern Tibetan Plateau.