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南海东南部陆缘S3界面(中中新世末)属性及其意义
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  • 英文篇名:Characteristics of interface S3 (the end of Middle Miocene) on the Southeast South China Sea margin and its geological implications
  • 作者:王利杰 ; 姚永坚 ; 孙珍 ; 卓海腾 ; 赵中贤 ; 殷征欣
  • 英文作者:WANG Lijie;YAO Yongjian;SUN Zhen;ZHUO Haiteng;ZHAO Zhongxian;YIN Zhengxin;CAS Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Key Laboratory of Marine Mineral Resources,Guangzhou Marine Geological Survey,Ministry of Land and Resources;South China Sea Bureau of Ministry of Natural Resources;
  • 关键词:S3地质界面 ; 地震反射特征 ; 下切水道 ; 空盆构造沉降 ; 南海东南部陆缘
  • 英文关键词:S3 interface;;seismic expressions;;incised channel deposits;;unloaded tectonic subsidence;;Southeastern South China Sea margin
  • 中文刊名:海洋地质与第四纪地质
  • 英文刊名:Marine Geology & Quaternary Geology
  • 机构:中国科学院南海海洋研究所边缘海与大洋地质重点实验室;中国科学院大学;广州海洋地质调查局国土资源部海底矿产资源重点实验室;自然资源部南海局;
  • 出版日期:2019-08-19
  • 出版单位:海洋地质与第四纪地质
  • 年:2019
  • 期:04
  • 基金:国家自然科学基金“南沙海域盆地的地层系统与深部结构研究:从南部陆缘解读南海的演化”(41576068);; 广东省自然科学基金研究团队项目“南海中北部陆缘大陆破裂机制的综合地球物理探测与模拟研究”(2017A030312002);; 青年科学基金“红河断裂与南海西缘断裂对接处的构造特征及演化过程”(4170060488)
  • 语种:中文;
  • 页:78-89
  • 页数:12
  • CN:37-1117/P
  • ISSN:0256-1492
  • 分类号:P736.22
摘要
南海东南部陆缘发育多个新生代沉积盆地,其构造—沉积响应记录了南海形成演化的丰富地质信息。中中新世末S3界面是南海东南部新生代沉积盆地热沉降期的重要地质界面,但目前研究尚不充分,且对其地质属性也存在较大争议。在钻井资料约束下,通过对礼乐盆地和西南、西北巴拉望盆地二维地震测线的精细解释,结合钻井岩性资料,从地震相—沉积相、构造沉降速率以及沉积中心迁移等变化角度,系统总结了S3界面的特征。该界面是区域性不整合面,可全区域追踪解释,但在研究区不同构造位置界面特征具有明显差异:在盆地边缘和岛礁发育区界面具有显著的"下削上超"不整合现象,而凹陷内多表现为整合接触,但局部伴生水道下切现象;在西北、西南巴拉望陆架和陆坡区,界面上下存在岩性和沉积相突变现象,局部由半深水—深水相突变为滨—浅海相。构造沉降分析显示,中中新世研究区以区域快速沉降为主,中中新世末(S3界面时期)沉降速率开始普遍减小,可能与南海扩张结束后深部动力机制有关。厘定S3界面的形成时间约为12Ma,认为其可能与菲律宾岛弧与巴拉望岛碰撞造成的大规模抬升事件有关。另外,研究区S3界面之上发育的富砂和富碳酸盐岩的重力流沉积体系则可能是12.5Ma以来全球海平面相对下降的直接响应,期间多次区域性的海退有利于砂质和碳酸盐岩沉积物向深水区的搬运。
        There are several Cenozoic basins on the southeastern margin of the South China Sea, the tectonic-depositional response of which bears a great deal of geological information on the evolution of the sea and basins. Formed by the end of the Middle Miocene,the interface S3 is an insufficiently studied and controversial interface formed within the thermal subsidence stage. Constrained by well data, and combined with the interpretation of 2 D seismic profiles crossing the Liyue and Palawan sub-basins, this paper systematically described the characteristics of the S3 interface, including lithology, seismic-sedimentary facies, tectonic subsidence rate,and migration of depocenters. This interface is marked by a prominent seismic reflector and can be traced over a large area in the study area. It also has different features on various tectonic elements. For example, the seismic expression is an angular truncation unconformity on the shelf of Palawan and part of Dangerous Grounds, whereas the interface is a continuous high amplitude reflection and has conformity contact, partially overlapped by incised channel deposits in the bathyal-abyssal area of Liyue and Palawan sub-basins. What's more, an abrupt change in lithological and sedimentary facies was observed on the northwest/southwest Palawan shelf and slope region, indicating a change from bathyal-abyssal facies to shallow marine facies. The S3 surface also marks an end of the rapid subsiding stage of Middle Miocene, evidenced by a decreasing subsiding rate that might be related with the deep geodynamic regimes after the seafloor spreading of the South China Sea. Based upon the detailed correlation of biostratigraphy of the unconformity, we propose that this interface probably developed at ca. 12 Ma due to the peak continent-arc collisional event between the Philippine Mobile Belt and the Palawan block. The observed gravity flow deposits on the S3 interface are probably linked with the dramatic sea-level fall since 12.5 Ma, which directly triggered the delivery of sand-rich or carbonate-rich sediments into the deep water.
引文
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