| 珠江口盆地多期走滑构造与叠合型拉分盆地:以阳江东凹为例 |
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| 引用本文： | 刘欣颖,吴静,朱定伟,索艳慧,周洁,王鹏程,王光增,刘泽,刘博,郭玲莉,朱俊江,李三忠.珠江口盆地多期走滑构造与叠合型拉分盆地:以阳江东凹为例[J].大地构造与成矿学,2021,45(1):6-19. |
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| 作者姓名： | 刘欣颖 吴静 朱定伟 索艳慧 周洁 王鹏程 王光增 刘泽 刘博 郭玲莉 朱俊江 李三忠 |
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| 作者单位： | 深海圈层与地球系统教育部前沿科学中心,海底科学与探测技术教育部重点实验室,中国海洋大学 海洋地球科学学院,山东 青岛 266100;青岛海洋科学与技术国家实验室 海洋矿产资源评价与探测技术功能实验室,山东 青岛 266100;中海石油(中国)有限公司 深圳分公司,广东 深圳 518000 |
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| 基金项目： | 国家自然科学基金项目;中央高校科研经费联合资助;国家科技重大专项;青岛创新领军人才项目;泰山学者项目对李三忠和刘永江教授的资助 |
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| 摘 要： | 珠江口盆地的成盆机制和构造演化过程探讨是该地区烃源岩研究中不可缺少的环节,也是大家广泛关注的焦点问题。本文以阳江东凹为例,通过整体与局部相结合的分析方法,从整体上确定了研究区走滑断裂的发育特征和展布框架,明确了区域构造运动与走滑断裂的成因联系;并将整体划分成局部,聚焦于阳江东凹古近纪盆地构造演化阶段逐步分解与精细检验,对珠江口盆地的成盆机制、发育过程和演化模式进行分阶段解剖和分析。结果表明,研究区的构造演化过程分为三个阶段:文三段沉积期NW-SE向伸展,文二段沉积期南北向区域拉张作用下NE走向断裂右行右阶走滑拉分和文一段-恩平组沉积期NWW向走滑断裂左行左阶拉分。由于三个阶段受到不同的区域构造运动影响,各阶段盆地的打开方式和断裂的分布特征具有一定差异。同时,不同时期的构造演化过程与同时期区域构造应力场的转变一一对应,控制了沉积-沉降中心的分布,据此本文提出珠江口盆地的裂解模式是多期走滑构造控制的"叠合型"拉分盆地的新认识,研究区整体表现为三期构造叠合型盆地,盆地的构造叠合机制与洼陷的生烃排烃具有一定的相关性。
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| 关 键 词： | 珠江口盆地 阳江东凹 三阶段演化 走滑拉分 叠合盆地 |
Superimposition of Strike-slip Faults and Pull-apart Basins in the Pearl River Mouth Basin: A Case Study from the Eastern Yangjiang Sag |
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| LIU Xinying,WU Jing,ZHU Dingwei,SUO Yanhui,ZHOU Jie,WANG Pengcheng,WANG Guangzeng,LIU Ze,LIU Bo,GUO Lingli,ZHU Junjiang,LI Sanzhong.Superimposition of Strike-slip Faults and Pull-apart Basins in the Pearl River Mouth Basin: A Case Study from the Eastern Yangjiang Sag[J].Geotectonica et Metallogenia,2021,45(1):6-19. |
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| Authors: | LIU Xinying WU Jing ZHU Dingwei SUO Yanhui ZHOU Jie WANG Pengcheng WANG Guangzeng LIU Ze LIU Bo GUO Lingli ZHU Junjiang LI Sanzhong |
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| Institution: | (Frontiers Science Center for Deep Ocean Multispheres and Earth System,Key Lab of Submarine Geosciences and Prospecting Techniques,MOE and College of Marine Geosciences,Ocean University of China,Qingdao 266100,Shandong,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266100,Shandong,China;Shenzhen Branch,CNOOC China Limited,Shenzhen 518000,Guangdong,China) |
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| Abstract: | The formation mechanism and tectonic evolution of the Pearl River Mouth Basin,which are critical to understand the development of oil resources in this area,remain controversial.To explore the tectonic evolution and formation mechanism of the eastern Yangjiang Sag,the overall characteristics and directions of strike-slip faults in the area were investigated through comprehensive study of the whole tectonic framework and partial structural analysis.The tectonic evolution of the eastern Yangjiang Sag during the Paleogene can be divided into three stages.During the first stage of the evolution of the Pearl River Mouth Basin,the strike-slip faults were developed under the NW-NE-directed extension.In the second stage,the NE-trending dextral strike-slip faults were developed,which led to the formation of pull-apart basins.During the third stage,the NW sinistral strike-slip faults that control some pull-apart basins were developed.The different tectonic movements of the three stages resulted in the different rift patterns of the basins.Combining the results of this and previous studies,we propose that the extension of the Pearl River Mouth Basin is a pull-apart basin related to multi-stage strike-slip faulting,and is the result of three-stage tectonic superimposition. |
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| Keywords: | Pearl River Mouth Basin eastern Yangjiang Sag three-stage tectonic evolution strike-slip pull-apart superimposed basin |
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