南海西南部马来盆地新生代构造沉降特征及其成因分析  

Cenozoic tectonic subsidence and its mechanism of the Malay Basin,southwest South China Sea

作　　者：刘璐[1,2] 施小斌 赵鹏[1,2] 刘唐伟[3] 赵俊峰 LIU Lu;SHI Xiaobin;ZHAO Peng;LIU Tangwei;ZHAO Junfeng(Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 511458,China;University of Chinese Academy of Science,Beijing 100049,China;School of Science,East China University of Technology,Nanchang 330013,China)

机构地区：[1]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,广州511458 [2]中国科学院大学,北京100049 [3]东华理工大学理学院,南昌330013

出　　处：《海洋地质与第四纪地质》2024年第2期171-182,共12页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目“南海西南部西巴兰线东西两侧热状态差异性及其对区域构造演化的制约”(42076075);“南海西沙海域新生代岩石圈热状态、热演化及其对地壳变形的制约”(42276074);“深部地热资源勘探开发中多层介质热传导反问题的建模与计算”(42264007)。

摘　　要：南海西南部是南海构造复杂程度最高的区域之一,为深入认识马来盆地及南海西南部构造演化过程,本文基于最近公开发表的地震剖面和钻井资料,对马来盆地内69个模拟井进行系统的构造沉降史重建,发现马来盆地构造沉降史可以分为张裂期快速沉降、裂后早期异常快速沉降、裂后中期慢速沉降以及裂后晚期缓慢沉降等4个阶段。分析表明马来盆地属于叠加了翼部小幅断裂走滑作用的张裂型沉积盆地,马来盆地裂后早期的快速构造沉降很可能是因加载作用导致的岩石圈非弹性屈服的结果。The southwestern part of the South China Sea(SCS)is one of the most complex tectonic regions of SCS.To further understand the tectonic evolution of the Malay Basin and the southwestern part of the SCS,we systematically rebuilt the tectonic subsidence history for 69 representative pseudo-wells based on recently published seismic and drilling data.Results show that the Cenozoic tectonic subsidence history could be divided into four stages including syn-rift rapid subsidence stage,early post-rift anomalous and rapid subsidence stage,middle post-rift slow subsidence stage,and late post-rift slow subsidence stage.Further analyses suggest that the Malay Basin is a rifted basin and later was superimposed by small-scale strike-slip action in its wings.The anomalous rapid tectonic subsidence in the early post-rift stage might be resulted from inelastic yield of the lithosphere caused by sedimentary loading.

关 键 词：异常沉降 构造演化 构造反转 马来盆地 

分 类 号：P736.1[天文地球—海洋地质]