| 琼东南盆地陆架区晚中新世以来断层活动性研究 |
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| 引用本文： | 胡守祥,姚衍桃,李健,李爽,汪灵,詹文欢,李伟,冯英辞.琼东南盆地陆架区晚中新世以来断层活动性研究[J].热带海洋学报,2021,40(2):90-102. |
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| 作者姓名： | 胡守祥 姚衍桃 李健 李爽 汪灵 詹文欢 李伟 冯英辞 |
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| 作者单位： | 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 5103012.中国科学院南海生态环境工程创新研究院, 广东 广州 5103013.中国科学院大学, 北京 100049 |
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| 基金项目： | 国家科技基础资源调查专项(2017FY201406);国家自然科学基金(41876067);中国科学院边缘海与大洋地质重点实验室资助项目(OMG18-11)。 |
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| 摘 要： | 对琼东南盆地陆架区晚中新世以来的断层活动性进行研究, 有助于理解南海西北部晚中新世以来的构造演化, 也对该区钻井平台的安全性评估、海洋工程勘查以及区域稳定性评价等有重要意义。研究区断层走向主要为NWW向, 多数断层在晚中新世时期停止活动。通过对断层几何形态的统计分析以及使用高分辨率断层落差图法(T-Z图示法)对断层活动性进行量化分析, 结果显示: 断层活动性在晚中新世末期(5.5Ma)发生转变; 研究区南部的断层落差值大于北部; 南部断层停止活动的时间较北部断层稍晚。这些研究成果表明, 晚中新世末期研究区断层受构造应力变化的影响, 在生长发育过程中断层活动性质发生了改变, 由逆断层转为正断层。红河断裂带对琼东南盆地的构造演化起着重要的控制作用, 文章推测研究区断层活动性变化是由红河断裂带的构造反转所导致, 因为红河断裂带在5.5Ma时发生了走滑运动的反转, 与研究区的断层活动性变化在时间和性质上相耦合。
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| 关 键 词： | 琼东南盆地 晚中新世以来 断层活动性 高分辨率断层落差图法 红河断裂带 |
| 收稿时间： | 2020-02-23 |
| 修稿时间： | 2020-04-10 |
Study on fault activities since the Late Miocene in the continental shelf of Qiongdongnan Basin |
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| HU Shouxiang,YAO Yantao,LI Jian,LI Shuang,WANG Ling,ZHAN Wenhuan,LI Wei,FENG Yingci.Study on fault activities since the Late Miocene in the continental shelf of Qiongdongnan Basin[J].Journal of Tropical Oceanography,2021,40(2):90-102. |
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| Authors: | HU Shouxiang YAO Yantao LI Jian LI Shuang WANG Ling ZHAN Wenhuan LI Wei FENG Yingci |
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| Institution: | 1. CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China2. Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China3. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The study of fault activities since the late Miocene in the shelf area of the Qiongdongnan Basin helps us understand its tectonic evolution.Such study plays an important role for the safety evaluation of drilling platform,oceaneering and regional stability evaluation.In this paper,the fault characteristics in the Qiongdongnan Basin are analyzed with statistics and the throw-depth(T-Z plots)to quantitatively analyze the fault activities in the region,and to discuss the causes of fault activity change.The faults in the study area were growth faults,the strike was mainly concentrated in the NWW,and most faults ceased in the Late Miocene period.Our quantitative results show that the fault activities changed in the Late Miocene period(5.5 Ma).The value of fault throw in the south part of the study area was much larger than that in the north.Based on the above results,we propose that the faults have been affected by tectonic stress in the process of growth,and the fault activities changed at the end of the late Miocene,from inverse fault to positive fault.The Red River Fault Zone played an important role in the tectonic evolution of the Qiongdongnan Basin,and the controlling factor of this change may be due to the tectonic reversal of the Red River Fault Zone.The reversal of the strike-slip motion of the Red River Fault Zone in 5.5 Ma was coupled with the change of the fault activities and the reverse of the faults in the study area. |
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| Keywords: | Qiongdongnan Basin Late Miocene fault activity T-Z plots Red River Fault Zone |
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