牟平—即墨断裂带南端断裂构造特征及动力学成因  

Features and Dynamic Mechanism of the Southern End of Muping-Jimo Fault

作　　者：葛君[1] 张泽坤[1] 倪金龙[1] 韩帅[1] 侯孝欢 李民[1] 

机构地区：[1]山东科技大学地球科学与工程学院,山东青岛266590

出　　处：《现代地质》2015年第4期747-754,共8页Geoscience

基　　金：山东省自然科学基金项目(ZR2013DM007);国家重点基础研究发展计划项目(2012CB723104);全国大学生科技创新项目(201310424033)

摘　　要：牟平—即墨断裂带南端位于青岛西海岸地区。基于详细的野外地质考察,查明了青岛西海岸地区断裂构造特征,探讨了断裂形成时的古构造应力状态及动力学机制。结果表明,青岛西海岸断裂构造以大量剪节理为主,次为断层和脉岩。剪节理的走向优势方位主要为NW—SE、NE—SW、近E—W及近S—N等4组,断层以近NE—SW向延伸为主;古构造应力状态恢复反映了晚白垩世以来青岛西海岸地区经历了两期挤压变形,即早期的近S—N向、晚期的近E—W向。早期的挤压变形可能与燕山运动晚期华北克拉通NW—SE向挤压派生的S—N向局部应力场相关;晚期的近E—W向挤压变形可能与古近纪以来青藏高原向东部的挤出及日本海的张开造成向西的挤压相关。晚白垩世以来,牟平—即墨断裂带南端至少发生了两期压扭性运动,先后分别为左行走滑与右行走滑运动。The southern end of Muping-Jimo fault is located in the western coastal region of Qingdao. Based on detailed field geological investigation, the characteristics of the fault were discovered in the area, and the paleo- stress state and dynamic mechanism were also discussed. The results show that, firstly, the structure of the fault along the western coast of Qingdao mainly consists of large numbers of shear joints, smaller faults and dikes; secondly, the dominant directions of shear joints are mainly four groups, i. e. NW-SE, NE-SW, E-W and S-N trending, and the extending direction of faults is mainly near NE trending ; thirdly, the inversion of paleo-stress state reflected that the study area had undergone two compressional activities since Late Cretaceous, S-N tren- ding compression in the early stage and nearly E-W trending compression in the later stage; fourthly, the com- pression in the early stage might be associated with NW-SE trending compression occurred in the North China Craton, which derived the local stress field with the S-N direction in the Late Yanshan movement, and the E-W trending compression in the later stage might be related to Qinghai-Tibet Plateau extrusion toward the east since Paleogene and the westward extrusion caused by Japan sea expansion since Miocene; and lastly, Muping- Jimo fault successively occurred at least two strike slip motions since Late Cretaceous, i. e. sinistral strike slip and dextral strike slip.

关 键 词：青岛西海岸 断裂 古构造应力场 牟平—即墨断裂带 

分 类 号：P542[天文地球—构造地质学]