| 南海东北部陆架边缘第四纪高分辨率层序地层和沉积体系演化及其控制因素 |
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| 引用本文： | 刘汉尧,林畅松,张忠涛,张博,姜静,田洪训,刘欢.南海东北部陆架边缘第四纪高分辨率层序地层和沉积体系演化及其控制因素[J].海洋学报(英文版),2019,38(5):86-98. |
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| 作者姓名： | 刘汉尧 林畅松 张忠涛 张博 姜静 田洪训 刘欢 |
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| 作者单位： | 中国地质大学(北京) 海洋学院, 北京, 100083,中国地质大学(北京) 海洋学院, 北京, 100083,中国海油深圳分公司研究院, 深圳, 518000,中国海油深圳分公司研究院, 深圳, 518000,中国地质大学(北京) 海洋学院, 北京, 100083,中国地质大学(北京) 海洋学院, 北京, 100083,中国地质大学(北京) 海洋学院, 北京, 100083 |
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| 基金项目： | The National Natural Science Foundation of China under contract Nos 91328201, 91528301 and 41130422. |
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| 摘 要： | The northeastern shelf margin of the South China Sea(SCS) is characterized by the development of large scale foresets complexes since Quaternary. Based on integral analysis of the seismic, well logging and paleontological data, successions since ～3.0 Ma can be defined as one composite sequence, consist of a set of regional transgressive to regressive sequences. They can be further divided into six 3 rd order sequences(SQ0–SQ5) based on the Exxon sequence stratigraphic model. Since ～1.6 Ma, five sets of deltaic systems characterized by development of wedge-shaped foresets complexes or clinoforms had been identified. High-resolution seismic data and the thick foresets allowed further divided of sub-depositional sequences(4 th order) of regression to transgression, which is basically consistent with published stacked benthic foram O-isotope records. Depositional systems identified in the study area include deltaic deposits(inner-shelf deltas and shelf-edge deltas), incised valleys, and slope slumping massive deposits. Since ～1.6 Ma, clinoforms prograded from the southern Panyu Lower Uplift toward the northern Baiyun Depression, shelf slope break migrated seaward, whereas the shelf edge of SQ0 migrated landward. The development of incised valleys in the continental shelf increased upward,especially intensive on the SB3 and SB2. The slumping massive deposits increased abruptly since SB2, which corresponds to the development of incised valleys. The evolution of depositional systems of continental slope mainly controlled by the combined influence of sea level changes, tectonic movements, sediment supply and climate changes. Since ～3.0 Ma, relative sea level of the northern SCS had been experienced transgression(～3.0 Ma BP) to regression(～1.6 Ma BP). The regional regression and maximum transgressions of the composite sequences were apparently enhanced by uplift or subsidence related to tectono-thermal events. In addition,climatic variations including monsoon intensification and the mid-Pleistocene transition may have enhanced sediment supply by increasing erosion rate and have an indispensable influence on the development of the incised valleys and 5 sets of deltaic systems since ～1.6 Ma.
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| 关 键 词： | 层序格架 沉积体系 陆架斜坡 第四系 珠江口盆地 |
| 收稿时间： | 2017/12/5 0:00:00 |
High-resolution sequence architecture and depositional evolution of the Quaternary in the northeastern shelf margin of the South China Sea |
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| LIU Hanyao,LIN Changsong,ZHANG Zhongtao,ZHANG Bo,JIANG Jing,TIAN Hongxun and LIU Huan.High-resolution sequence architecture and depositional evolution of the Quaternary in the northeastern shelf margin of the South China Sea[J].Acta Oceanologica Sinica,2019,38(5):86-98. |
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| Authors: | LIU Hanyao LIN Changsong ZHANG Zhongtao ZHANG Bo JIANG Jing TIAN Hongxun and LIU Huan |
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| Institution: | 1.School of Ocean Sciences, China University of Geosciences, Beijing 100083, China2.Shenzhen Branch of CNOOC Ltd., Guangzhou 518000, China |
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| Abstract: | The northeastern shelf margin of the South China Sea (SCS) is characterized by the development of large scale foresets complexes since Quaternary. Based on integral analysis of the seismic, well logging and paleontological data, successions since~3.0 Ma can be defined as one composite sequence, consist of a set of regional transgressive to regressive sequences. They can be further divided into six 3rd order sequences (SQ0-SQ5) based on the Exxon sequence stratigraphic model. Since~1.6 Ma, five sets of deltaic systems characterized by development of wedge-shaped foresets complexes or clinoforms had been identified. High-resolution seismic data and the thick foresets allowed further divided of sub-depositional sequences (4th order) of regression to transgression, which is basically consistent with published stacked benthic foram O-isotope records. Depositional systems identified in the study area include deltaic deposits (inner-shelf deltas and shelf-edge deltas), incised valleys, and slope slumping massive deposits. Since~1.6 Ma, clinoforms prograded from the southern Panyu Lower Uplift toward the northern Baiyun Depression, shelf slope break migrated seaward, whereas the shelf edge of SQ0 migrated landward. The development of incised valleys in the continental shelf increased upward, especially intensive on the SB3 and SB2. The slumping massive deposits increased abruptly since SB2, which corresponds to the development of incised valleys. The evolution of depositional systems of continental slope mainly controlled by the combined influence of sea level changes, tectonic movements, sediment supply and climate changes. Since~3.0 Ma, relative sea level of the northern SCS had been experienced transgression (~3.0 Ma BP) to regression (~1.6 Ma BP). The regional regression and maximum transgressions of the composite sequences were apparently enhanced by uplift or subsidence related to tectono-thermal events. In addition, climatic variations including monsoon intensification and the mid-Pleistocene transition may have enhanced sediment supply by increasing erosion rate and have an indispensable influence on the development of the incised valleys and 5 sets of deltaic systems since~1.6 Ma. |
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| Keywords: | sequence architecture depositional systems continental slope Quaternary Zhujiang (Pearl) River Mouth Basin |
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