断层泥显微结构与矿物成分研究进展——以龙门山断裂带为例
Research Progress on Microstructure and Mineral Composition of Fault Gouge—A Case Study of the Longmenshan Fault Zone
摘要: 断层泥是活动断裂带内最具代表性的软弱断层岩,其形成与构造剪切、颗粒破碎、流体–岩石相互作用及低温蚀变等过程密切相关,能够连续记录断层长期活动的力学环境、变形方式与演化历史。显微结构是断层泥在剪切过程中形成的直观痕迹,可用于判别断层是地震式快速滑动,还是稳定蠕滑;矿物组成尤其是黏土矿物组合,则对变形温度、流体性质、蚀变强度具有敏感响应。二者结合,已成为判断断裂活动性、分析强震机理、评价工程地质稳定性的重要依据。龙门山断裂带位于青藏高原东缘,是典型的大陆内部逆冲推覆构造带,历史上发生过多次强震,断裂带内部断层泥发育完整、露头连续,为开展微观结构与矿物成分研究提供了良好条件。文章在总结国内外相关研究的基础上,系统梳理了断层泥的野外采集、显微观测与矿物分析的主要方法,详细阐述了断层泥显微结构类型、矿物组成特征及其地质意义,重点讨论了显微结构与矿物组合联合用于判别滑动方式、活动期次、变形环境和工程稳定性的思路,并以龙门山断裂带为例,总结了该区域在断层泥研究方面的主要成果。最后指出当前研究存在的不足,并对未来发展方向进行展望。
Abstract: Fault gouge is one of the most representative weak fault rocks in active fault zones. Its formation is closely related to tectonic shearing, grain fragmentation, fluid-rock interaction and low-temperature alteration, which can continuously record the mechanical environment, deformation pattern and evolution history of long-term fault activity. The microstructure is an intuitive trace formed during the shearing process of fault gouge, which can be used to distinguish whether the fault slips rapidly in earthquakes or creeps steadily. The mineral composition, especially clay mineral assemblage, is sensitive to deformation temperature, fluid properties and alteration intensity. The combination of microstructure and mineral composition has become an important basis for judging fault activity, analyzing strong earthquake mechanisms and evaluating engineering geological stability. Located on the eastern margin of the Qinghai-Xizang Plateau, the Longmenshan Fault Zone is a typical intracontinental thrust belt. Many large earthquakes have occurred in history, and the fault gouge inside the fault zone is well developed and continuously exposed, providing favorable conditions for the study of microstructure and mineral composition. Based on the summary of relevant research, this paper systematically sorts out the main methods of field collection, microscopic observation and mineral analysis of fault gouge, expounds the types of microstructure, mineral composition characteristics and their geological significance, and focuses on the idea of combining microstructure and mineral assemblage to identify slip patterns, activity stages, deformation environment and engineering stability. Taking the Longmenshan Fault Zone as an example, this paper summarizes the main research results of fault gouge in this area. Finally, the deficiencies of current research are pointed out, and the future development direction is prospected.
文章引用:黄晓可. 断层泥显微结构与矿物成分研究进展——以龙门山断裂带为例[J]. 地球科学前沿, 2026, 16(4): 524-537. https://doi.org/10.12677/ag.2026.164047

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