渤海海域中西部新构造运动特征  

Neotectonics in the western and central Bohai Sea

作　　者：陈江欣[1,2] 侯方辉 李日辉[1,2] 温珍河 CHEN Jiangxin;HOU Fanghui,;LI Rihui;WEN Zhenhe(The Key Laboratory of Gas Hydrate,Ministry of Natural Resources,Qingdao Institute of Marine Geology,Qingdao 266071,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China)

机构地区：[1]自然资源部天然气水合物重点实验室,青岛海洋地质研究所,青岛266071 [2]青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室,青岛266071

出　　处：《海洋地质与第四纪地质》2018年第4期83-91,共9页Marine Geology & Quaternary Geology

基　　金：中国地质调查“1：100万天津幅海洋区域地质调查项目”(1212011220113); 国家自然科学基金“冷泉流体活动地貌产生机制及其活动性--以中建南盆地为例”(41606077)

摘　　要：依据最新的高分辨率单道地震测网,结合前人研究成果,编制了渤海中西部海域中更新统、上更新统、全新统和中更新统以来的地层厚度图,揭示受到喜马拉雅造山运动的影响,区域应力场从岩石圈热沉降中的裂后弱伸展环境转变为北东东—东西向水平挤压应力场,第四纪以前以渤中凹陷和歧口凹陷中北部为沉降中心差异沉积,早更新世和中更新世,张家口-蓬莱断裂带与秦皇岛-旅顺断裂带沿NW向左旋走滑,发生显著差异沉降,沉降中心北移,并被秦皇岛-旅顺断裂所控制,等厚度线整体呈NW向。共轭NE向新生庙西北-黄河口断裂带发育活动并发生右旋剪切平移,郯庐断裂南段由于其北北东走向受到区域应力场的抑制至少在中更新世以前便失去整体活动性。晚更新世和全新世,区域受喜马拉雅造山运动影响显著减弱,以区域整体沉降和均衡沉降为主,断裂活动减弱,数量也大大减少。From the high resolution single-channel seismic reflection data recently acquired,the sediment thickness of the middle Pleistocene,upper Pleistocene,Holocene and the sediment thickness since middle Pleistocene to Holocene are produced.Results reveal that affected by the Himalayan orogeny,the stress field of the region has changed from a weak stretching environment of post-rift thermal subsidence to a NEE-WE horizontal compressive stress field.Sedimentation was then differentiated in two subsiding centers of the Bozhong depression and north-central Qikou depression before Quaternary.During the early and middle Pleistocene Epoch,the Zhangjiakou-Penglai fault zone and the Qinhuangdao-Lvshun fault zone were leftlateral strike-slip fault zones along the NW direction.Under the control of the Qinhuangdao-Lvshun fault,significant differentiation of subsidence occurred and the subsidence center moved to the north.Isopach map displays a preferential NW orientation.Conjugated and newly generated NE Yellow River estuary-northwest Miao fault zone was activated as a dextral strike-slip shear zone.The southern part of the Tanlu fault zone was inactive at least before middle Pleistocene,due to its NNE trending prohibited by a regional stress field.This region suffered regional isostatic subsidence during the period from late Pleistocene to Holocene,while the activity of the fault zone became weak,and the number of faults decreased significantly.

关 键 词：新构造 构造沉降 活断层 渤海 第四纪 

分 类 号：P736.1[天文地球—海洋地质]