鲁西地块新生代断裂体系活动性与深部动力机制  

Activity of Cenozoic fault system in the Luxi Block and deep dynamics

作　　者：李少俊[1,2] 李三忠 李玺瑶[1,2] 索艳慧 王鹏程 王倩[1,2] 张剑 周在征[1,2] LI Shaojun;LI Sanzhong;LI Xiyao;SUO Yanhui;WANG Pengcheng;WANG Qian;ZHANG Jian;ZHOU Zaizheng(Key Lab of Submarine Geosciences and Prospecting Techniques,MOE,College of Marine Geosciences,Ocean University of China,Qingdao 266100,China;Laboratory for Marine Geology and Environment,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266061,China)

机构地区：[1]海底科学与探测技术教育部重点实验室,中国海洋大学海洋地球科学学院,青岛266100 [2]青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室,青岛266061

出　　处：《海洋地质与第四纪地质》2018年第4期123-134,共12页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金杰出青年基金“构造地质学”(41325009); 山东省泰山学者特聘教授项目; 鳌山卓越科学家计划“洋陆过渡带构造过程的资源灾害效应”(2015ASTP-0S10); 中央高校基本科研业务费专项; 国家科技重大专项“寒武系-中新元古界盆地原型、烃源岩与成藏条件研究”(2016ZX05004001-003)

摘　　要：根据野外观察分析,综合前人研究成果,对新生代时期鲁西地块的深、浅部构造特征、地震活动性以及动力学机制进行了分析。结果表明,鲁西地块新生代浅表主体断裂构造格局为NW—NWW走向断裂构成的多米诺式组合,震源机制解和野外观测揭示,其具有左旋走滑性质,并与NE向断裂共同控制了新生代盆地的形成和发育。地球物理资料揭示,鲁西地块深部15~20km处存在一条缓倾滑脱带和大规模低速异常体,浅表多米诺式断裂体系归并到该滑脱带,表现为深浅部构造的脱耦性,深部高低速异常体的过渡区域控制发育了鲁西地区两条NW向中强地震带。动力学成因上与太平洋板块俯冲作用导致地壳减薄、地幔上涌并在地幔楔中发生小尺度对流有关,并造成了鲁西地块的隆起抬升。Based on field observation and previous researches,this paper devotes to the Cenozoic fault system in the Luxi Block,with focuses on the connection between the shallow and deep earthquakes and geodynamic mechanism.The results show that the NW and WNW-trending shallow faults are both domino-style faults with sinistral strike slipping according to focal mechanisms.The two sets of faults,together with the NE-trending faults control the formation and development of Cenozoic basins.In depth,there is a gently dipping decollement structure on a large-scale low-velocity anomaly,which is coupled with the shallow system.The deep transitional zones between the high and low anomaly zones controls the distribution of two strong NW-trending earthquake zones.The subduction of the Pacific Plate results in crustal thinning and mantle upwelling which triggered a small-scale convetion within the mantle wedge and resulted in uplifting of the Luxi Block.

关 键 词：断裂体系 地震活动 动力机制 鲁西地块 新生代 

分 类 号：P542[天文地球—构造地质学]