华北地块南部断裂体系新构造活动特征  

Neotectonic activity and its kinematics of fault system in the south of North China Block

作　　者：许立青[1,2] 李三忠[1,2] 索艳慧[1,2] 刘鑫[1,2] 戴黎明[1,2] 吴奇[1,2] 王鹏程[1,2] 张丙坤[1,2] 

机构地区：[1]海底科学与探测技术教育部重点实验室,山东青岛266100 [2]中国海洋大学海洋地球科学学院,山东青岛266100

出　　处：《地学前缘》2013年第4期75-87,共13页Earth Science Frontiers

基　　金：中国地质调查局项目(1212011120103);国家自然科学基金项目(41072152;41190072)

摘　　要：根据野外观察、测量与分析,特别是综合华北地块南部断裂体系第四纪活动性质的构造和地貌标志,表明现今华北地块南部NWW NW向断裂活动最为显著,主要表现为左旋走滑性质;在前新生代构造基础上发育的三门峡—鲁山—舞阳断裂带和新构造期发育的新乡—商丘断裂带是具有走滑性质的新生代壳内活动断裂。地球物理资料表明,在介休—新乡—溧阳和巴东—泉州—台湾地震带西北部的深部存在两个NW向构造带,在地幔可能汇聚为一条构造带。综合这些断裂及其所控断陷盆地的展布特征,明确了该区的NE向、NW向及近EW向断裂的运动学关系。即在应力应变基底格局的制约下,两个NW向构造带强烈的左旋走滑拉分运动作用下导致华北地块南部发育拉分盆地,NW向新断裂的形成和先存NNE、NW及近EW向断裂的复活,控制了新生代复杂的断裂或断块构造格局的形成。According to field observations,measurement and analysis of active faults,especially synthesizing morphological and structural evidence for the Quaternary activity of these faults in the south of North China Block,this paper suggests that the NWW NW-trending faults are strong active in the North China Block,and featured by left strike-slipping.The Sanmenxia Lushan-Wuyang Fault inherited from the Pre-Cenozoic fault;the Xinxiang-Shangqiu Faults developed in neotectonic period are Cenozoic intra-crustal faults with sinistral strike-slip component.The geophysical data indicate that there are two NW-trending tectonic and earthquake belts in the deep crustal structure of the northern part of the Jiexiu Xinxiang Liyang and Badang Quanzhou Taiwan earthquake belts,which may have merged into a big one in the mantle.According to spatial distribution of these faults and the related basins,this paper presents a kinematic model of pull-apart basin to clarify the kinematic relations of the NE,the NW-and EW-trending faults in the study area.The two NW-trending tectonic and earthquake belts show sinistral strike-slipping which resulted in pull-apart basins in the south of North China Block and the pre-existing EW-and NNE-trending faults reactivated and some new NW-trending faults developed.Therefore,the complex Cenozoic faults are characterized by block faulting under the control of stress field,strain field and the basement structural framework.

关 键 词：新构造 华北地块南部 地震 活动断裂 左旋走滑 拉分盆地 

分 类 号：P546[天文地球—构造地质学]