吕梁山地区中—新生代隆升演化探讨

对吕梁山地区中—新生代隆升时限及其演化的认识，是恢复鄂尔多斯盆地沉积东界的基础，也是探讨华北克拉通演化和破坏等科学问题的有机组成部分。本文以改造盆地与盆山耦合的研究思路为指导，通过对研究区及邻区前中生代地质演化、中生代原始沉积面貌、中生代构造变动与岩浆活动以及新生代以来与相邻地堑发育耦合关系等的分析，并结合裂变径迹测年与热史模拟，认为吕梁山地区在中生代鄂尔多斯盆地发育的主要时期是大型沉积盆地的一部分，与鄂尔多斯盆地经历了同步沉降—抬升过程。晚白垩世以来是吕梁山地区主要的隆升期，可进一步分为缓慢隆升（100～21±2Ma）、加速隆升（21±2～8Ma）及强烈隆升（8Ma以来）3个隆升演化阶段。吕梁山地区中—新生代以来的隆升演化，与相邻鄂尔多斯盆地的抬升消亡及其周边断陷盆地的发育从属统一的区域动力学环境，主要与滨太平洋构造域的活动和演化息息相关，同时受更广阔的区域地球动力学环境的影响。

Uplifting and Evolution Characteristics in the Lliang Mountain and Its Adjacent Area during the Meso-Cenozoic

The significance of the research on uplifting and evolution of the Lliang mountain during Meso-Cenozoic lies in its importance to restore the eastern sedimentary boundary of the Ordos basin. Furthermore, this study also is an important aspect to discuss the evolution and breakup of the North China Craton. The thoughts to research on reformed basin and basin-mountain coupling are followed in this paper. Based on the study of the geologic evolution pre-Mesozoic, the structural deformation, magmatism and the original sedimentary framework in the Mesozoic, the coupling relationship with the neighboring graben in the Cenozoic and so on, combined with the fission track dating and modeling, it's suggested that the study area was a part of the Ordos basin, and experienced subsiding-eroding processes similar to the residual Ordos basin in the Mesozoic. The large-scaled uplifting of the Lliang mountain took place after the Late Cretaceous. It can be divided into three stages, that is slowly uplifting (100Ma～21±2Ma), accelerated uplifting (21±2Ma～8Ma) and intensive uplifting (since 8Ma). The uplifting and evolution of the Lliang mountain during the Meso-Cenozoic, the uplifting and dying out of the Ordos basin and the development of the adjacent grabens controlled by the uniform regional dynamic setting, mainly related with the the movement and evolution of the Pacific tectonic domain, while affected by wider regional geodynamic setting simultaneously.