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*

doi:10.11978/2024233

Abstract

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

CLC Number:

P736.121

JU Zelong, ZHAN Wenhuan, GUO Jian, WU Xiaochuan, LI Jian, YAO Yantao, FENG Yingci, SUN Jie, WANG Pin, YI Hu, HUANG Jiaxian, XIONG Xin. Identification and analysis of kinematic indicators of early pliocene mass transport complexes: A case study of the northeastern continental slope in the Qiongdongnan Basin^*[J].Journal of Tropical Oceanography, 2025, 44(5): 108-124.

Figures/Tables 11

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MTCs	类型	时代	平均厚度/m	运动标志	地震相特征
MTC4	含块体	上新世	130	挤压脊、块体和滑动轨迹	中−强振幅, 杂乱反射, 块体内部表现为杂乱、透明反射特征
MTC3	含块体	上新世	200	挤压脊、沟槽、块体、滑动轨迹和逆冲褶皱带	中−强振幅, 杂乱反射, 块体内部表现为强振幅平行、倾斜堆叠反射特征
MTC2	不含块体	早中新世	150	挤压脊	弱振幅, 高连续性, 水平状
MTC1	不含块体	早中新世	140	挤压脊	弱振幅, 半透明, 杂乱反射

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

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

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Figures/Tables 11

References 71

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