热带海洋学报 ›› 2025, Vol. 44 ›› Issue (5): 108-124.doi: 10.11978/2024233CSTR: 32234.14.2024233

• 海洋地质学 • 上一篇    下一篇

上新世早期块体搬运复合体运动标志识别与分析——以琼东南盆地东北陆坡为例*

琚泽龙1,2(), 詹文欢1,2(), 郭建3, 吴晓川4,5, 李健1, 姚衍桃1, 冯英辞1, 孙杰1, 王玭1, 易虎1,2, 黄嘉宪1,2, 熊鑫6   

  1. 1.中国科学院边缘海与大洋地质重点实验室(中国科学院南海海洋研究所), 广东 广州 511458
    2.中国科学院大学, 北京 100049
    3.山东省地矿工程勘察院(山东省地质矿产勘查开发局八〇一水文地质工程地质大队), 山东 济南 250014
    4.页岩气勘探开发国家地方联合工程研究中心, 重庆地质矿产研究院, 重庆 401120
    5.自然资源部页岩气资源勘查重点实验室, 重庆地质矿产研究院, 重庆 401120
    6.东华理工大学测绘与空间信息工程学院, 江西 南昌 330013
  • 收稿日期:2024-12-13 修回日期:2025-02-21 出版日期:2025-09-10 发布日期:2025-10-14
  • 通讯作者: 詹文欢
  • 作者简介:

    琚泽龙(2000—), 男, 安徽省安庆市人, 硕士研究生, 从事海洋地质灾害研究。email:

    *感谢匿名审稿专家提出的宝贵修改意见和建议。

  • 基金资助:
    广东省重大人才工程项目(2023JC07H110); 国家重点研发计划项目(2022YFC3103800); 国家自然科学基金项目(42206069); 国家自然科学基金项目(42272098); 广州市科技计划项目(2023A04J0191); 海南省自然科学基金青年基金资助(423QN321)

Identification and analysis of kinematic indicators of early pliocene mass transport complexes: A case study of the northeastern continental slope in the Qiongdongnan Basin*

JU Zelong1,2(), ZHAN Wenhuan1,2(), GUO Jian3, WU Xiaochuan4,5, LI Jian1, YAO Yantao1, FENG Yingci1, SUN Jie1, WANG Pin1, YI Hu1,2, HUANG Jiaxian1,2, XIONG Xin6   

  1. 1. CAS Key Laboratory of Ocean and Marginal Sea Geology (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 511458, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Shandong Provincial Geo-mineral Engineering Exploration Institute (801 Institute of Hydrogeology and Engineering Geology, Shandong Provincial Bureau of Geology and Mineral Resources), Jinan 250014, China
    4. National Joint Local Engineering Research Center for Shale Gas Exploration and Development, Chongqing Institute of Geology and Mineral Resources, Chongqing 401120, China
    5. Key Laboratory of Shale Gas Exploration, Ministry of Natural Resources, Chongqing Institute of Geology and Mineral Resources, Chongqing 401120, China
    6. School of Surveying and Geoinformation Engineering, East China University of Technology, Nanchang 330013, China
  • Received:2024-12-13 Revised:2025-02-21 Online:2025-09-10 Published:2025-10-14
  • Contact: ZHAN Wenhuan
  • Supported by:
    Major Talent Project in Guangdong Province(2023JC07H110); National key Research and Development Program of China(2022YFC3103800); National Natural Science Foundation of China(42206069); National Natural Science Foundation of China(42272098); Science and Technology Projects of Guangzhou(2023A04J0191); Hainan Provincial Natural Science Foundation of China(423QN321)

摘要:

文章通过对琼东南盆地深水区高分辨率三维地震资料的精细解释, 在琼东南盆地东北部陆坡发现了4期块体搬运沉积复合体(mass transport complexes, MTCs): MTC1、MTC2、MTC3和MTC4。其中, MTC1、MTC2 和 MTC4 发育规模较小, 内部挤压程度低, 平均厚度130~150m; MTC3发育规模最大, 内部变形最为剧烈, 平均厚度200m。通过识别和分析MTC3内部和外部的运动学标志, 确定了其向西南方向搬运, 并将其发育过程划分为初始边坡失稳阶段、滑移阶段和流体转换阶段。根据本次识别的MTCs形态及内部结构特征, 结合研究区的构造与气候演化背景, 认为该多期次MTCs的发育受地层坡度、海平面波动和高沉积速率的共同影响, 而红河断裂带持续走滑运动是其发育的主导控制因素。具体而言, 中新世晚期(10.5Ma)以后海平面的快速降低和上升, 改变了沉积物强度和地层压力参数, 促进了MTCs的发育; 5.5Ma以来琼东南盆地的快速沉降导致可容纳空间增大、物源进积以及坡度加大等, 为多期次MTCs的形成提供了条件; 红河断裂带持续走滑运动引发的断层活动则是触发该区域多期次MTCs的主要因素。

关键词: 琼东南盆地, 块体搬运复合体, 地震反射特征, 运动标志, 发育过程

Abstract:

Through detailed interpretation of high-resolution 3D seismic data from the deepwater area of the Qiongdongnan Basin, this study identifies four stages of Mass Transport Complexes (MTCs) on the northeastern slope of the basin: MTC1, MTC2, MTC3, and MTC4. Among these, MTC1, MTC2, and MTC4 are relatively small in scale with low internal compression, averaging 130-150 m in thickness, while MTC3 is the largest and exhibits the most intense internal deformation, with an average thickness of 200 m. By identifying and analyzing the kinematic indicators within and outside MTC3, its southwestward transport direction was determined, and its developmental process was divided into three stages: initial slope instability, sliding, and fluid transformation. Based on the morphology and internal structural characteristics of the identified MTCs, combined with the tectonic and climatic evolution of the study area, it is concluded that the development of these multi-stage MTCs is influenced by the combined effects of stratigraphic slope, sea-level fluctuations, and high sedimentation rates, with the continuous strike-slip movement of the Red River Fault Zone being the dominant controlling factor. Specifically, the rapid fall and rise of sea levels after the late Miocene (10.5 Ma) altered sediment strength and stratigraphic pressure parameters, promoting MTC development. The rapid subsidence of the Qiongdongnan Basin since 5.5 Ma increased accommodation space, enhanced sediment progradation, and steepened slopes, creating conditions for multi-stage MTC formation. Additionally, fault activity triggered by the continuous strike-slip movement of the Red River Fault Zone is the primary factor triggering the multi-stage MTCs in this region. This study enhances the understanding of the depositional characteristics and triggering factors of multi-phase MTCs on the northeastern slope of the Qiongdongdong Basin and provides insights for exploring MTC development in the South China Sea.

Key words: Qiongdongnan Basin, mass transport complexes, seismic reflection characteristics, kinematic indicators, development process

中图分类号: 

  • P736.121