青藏高原东北缘及其与外围克拉通盆地构造转换区岩石圈精细结构及变形的深部过程

The northeastern Tibetan plateau and its surrounding transition zones, from Tibetan plateau to the Alashan block and Ordos craton and Sichuan basin, is a natural laboratory for investigating the lithospheric deformation and deep process of intra-continent. Two reasons derive the above statement. The first is that the complex lithospheric structure and deformation in this region has recorded the lithospheric processes of the tectonic transitions from Tibet Plateau to the surrounding craton, and the second is that it has controlled some important tectonic processes, such as continental material convergence – thickening – collapse and lateral escaping. The tectonic transition zones to be studied in this project are also the main resource and seismic belts in China. Thus, Investigating the fine lithospheric structure and deformation process in the studying region not only has important scientific significance, but also help to understanding the deep background of seismic hazards and hydrocarbon generation. We propose here an integrated study of the fine lithospheric structure in the key area. The deep seismic reflection profile will be used as the primary imaging tools. The existing data will be integrated with some supplied geological and geophysical observations to interpret and reconstruct the whole lithospheric deformation behavior and deformation style, and to reveal the lithospheric deformation contrast and deep process in the tectonic transition belts. These results will contribute to a better understanding of some geodynamic issues, including the uplift and lateral extension of the Tibetan plateau, and the intra-continental tectonic deformation, and their impact on resources and earthquake hazards.

青藏高原东北缘及其与阿拉善、鄂尔多斯、四川等克拉通盆地接合地区，岩石圈结构复杂，变形样式丰富，记录着自高原内部向外围克拉通构造转换的岩石圈变形过程，控制了大陆物质会聚-增厚-垮塌以及侧向逃逸等岩石圈变形作用，为探索大陆内部岩石圈构造变形与深部过程，提供了一个备受全球瞩目的天然实验室。同时，这一高原-盆地构造转换区也是我国能源和地震灾害的聚集地。揭示其精细岩石圈结构、探索岩石圈变形深部过程，不仅具有重要科学意义，而且对于更好地理解地震灾害、油气生成的深部背景也是非常必要和紧迫的。本项目针对这一关键地区，以深地震反射剖面为先锋，从探测岩石圈精细结构入手，通过适当补充地质与地球物理观测和已有数据约束处理解释，浅表联系深部，对岩石圈变形行为与变形样式进行恢复性研究，揭示不同构造转换边界岩石圈变形的差异性和深部过程。进一步理解高原隆升、侧向生长和大陆内部构造变形的地球动力学，及其对资源、灾害的影响。

青藏高原东北缘及其与阿拉善、鄂尔多斯、四川等克拉通盆地接合地区，岩石圈结构复杂 ，变形样式丰富，记录着自高原内部向外围克拉通构造转换的岩石圈变形过程，控制了大 陆物质会聚-增厚-垮塌以及侧向逃逸等岩石圈变形作用，为探索大陆内部岩石圈构造变形 与深部过程，提供了一个备受全球瞩目的天然实验室。同时，这一高原-盆地构造转换区 也是我国能源和地震灾害的聚集地。揭示其精细岩石圈结构、探索岩石圈变形深部过程， 不仅具有重要科学意义，而且对于更好地理解地震灾害、油气生成的深部背景也是非常必 要和紧迫的。本项目针对这一关键地区，以深地震反射剖面为先锋，从探测岩石圈精细结 构入手，通过适当地补充地质与地球物理观测和已有数据约束处理解释，浅表联系深部，对岩石圈变形行为与变形样式进行了恢复研究，揭示了不同构造转换边界岩石圈变形的差异性和深部过程。进一步理解了高原隆升、侧向生长和大陆内部构造变形的地球动力学，及其对资源、灾害的影响。