南海陆缘中南-礼乐断裂带的发育与构造活动  

Zhongnan-Liyue Fault Zone Developed at Continental Margins of the South China Sea and Tectonic Movements

作　　者：邱燕[1,2] 聂鑫 阎贫[2,3] 黄文凯 杜文波 鞠东[1,2] Qiu Yan;Nie Xin;Yan Pin;Huang Wenkai;Du Wenbo;Ju Dong(Key Laboratory of Marine Mineral Resources,Ministry of Natural Resources,Guangzhou Marine Geological Survey,Guangzhou 510075,China;Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 511458,China;Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Innovation Academy of South China Sea Ecology and Environmental Engineering,Chinese Academy of Sciences,Guangzhou 510301,China)

机构地区：[1]广州海洋地质调查局,自然资源部海底矿产资源实验室,广东广州510075 [2]南方海洋科学与工程广东省实验室(广州),广东广州511458 [3]中国科学院边缘海与大洋地质重点实验室(南海海洋研究所),南海生态环境工程研究院,广东广州510301

出　　处：《地球科学》2024年第10期3471-3487,共17页Earth Science

基　　金：国家自然科学基金(No.U1901217);南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(No.GML2019ZD0104);中国地质调查局国家海洋专项项目(Nos.DD20221712,DD20240090)。

摘　　要：南海南、北陆缘是否发育与目前中央海盆中存在的中南-礼乐断裂有关的S-N向走滑断裂带,一直是从事南海构造演化研究者关注的焦点之一,皆因资料缺乏等原因而没有定论.通过分析南海陆缘残余中生界的分布特征与精细解释最新地质-地球物理资料破解这一难题.南海陆缘发育S-N向延伸的中南-礼乐断裂带,构造属性为大型走滑断裂,初始活动时间始于中生代.新生代南海发生海底扩张之前,发育在南、北陆缘的中南-礼乐断裂带基本相连,长约700 km.该断裂带在不同时期具有不同的构造活动特征.中生代为左旋走滑构造活动,古近纪早、中期具有走滑拉张的活动特征,晚古近纪与早新近纪以走滑活动为主,新近纪中、晚期为走滑挤压活动特征.Whether a strike-slip fault zone of S-N trend developed in the centre South China Sea(SCS)has been focused by geologists who study tectonic evolution,but no any conclusion due to lack of data.The difficult issue has been resolved in this paper by studying the distribution of residual Mesozoic strata and interpreting new geological and geophysics data in the SCS.Zhongnan-Liyue(ZL)fault zone,a strike-slip fault zone with S-N trend,developed at both southern and northern continental margins and the initial time of its activity was at least in Mesozoic.Before sea-floor spreading of the SCS,this strike-slip fault zone attains about 700 km at southern and northern continental margins.In different geological times this fault zone was of different characteristics of tectonic movement,that was strike slip of left-rotation in Mesozoic,strike slip and extension in Early-Middle Paleogene,in order to strike slip in Late Paleogene and Early Neogene,last one strike slip accompanying pressure function in Middle-Late Neogene.

关 键 词：中南-礼乐断裂带 残余中生界 S-N向走滑断裂 构造活动 南海陆缘的东部 海洋地质学 

分 类 号：P736[天文地球—海洋地质]