| 琼东南盆地半地堑特征及其动力学探讨 |
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| 引用本文： | 龙根元,吴世敏,刘兵,郭翔燕.琼东南盆地半地堑特征及其动力学探讨[J].大地构造与成矿学,2010,34(1). |
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| 作者姓名： | 龙根元 吴世敏 刘兵 郭翔燕 |
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| 作者单位： | 中国科学院,南海海洋研究所,边缘海地质重点实验室,广东,广州,510301;中国科学院,研究生院,北京,100049;中山大学,地球科学系,广东,广州,510275 |
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| 基金项目： | 国家重点基础研究发展计划项目(2007CB411706-05);;国家自然科学基金(40576025)资助 |
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| 摘 要： | 利用琼东南盆地的反射地震剖面等资料,对其中具有代表性的崖北、北礁凹陷等半地堑的几何学、运动学特征进行分析,划分出旋转半地堑、滚动半地堑和多米诺式半地堑系3种类型,认为半地堑经历了中始新世-早渐新世、晚渐新世-早中新世两个演化阶段,并且在时间上有东早西晚,空间上有"东西分块、南北分带"的特征。在盆地半地堑组合特征及区域构造分析的基础上,指出盆地的发育与演化主要受古太平洋板块俯冲带后撤、红河断裂的左行走滑和南海海盆扩张的联合作用影响,表现为裂陷前期(Tg-T7)主要受古太平洋板块俯冲后撤及红河断裂的左行走滑联合作用,后期(T-T)主要受南海海盆海底扩张作用影响;而盆地张裂是通过纯剪切作用完成的。
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| 关 键 词： | 半地堑 构造样式 琼东南盆地 南海北部 |
Characteristics of Half-Grabens in the Qiongdongnan Basin and Their Dynamic Implications |
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| LONG Genyuan,WU Shimin,LIU Bing,GUO Xiangyan.Characteristics of Half-Grabens in the Qiongdongnan Basin and Their Dynamic Implications[J].Geotectonica et Metallogenia,2010,34(1). |
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| Authors: | LONG Genyuan WU Shimin LIU Bing GUO Xiangyan |
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| Institution: | 1.CAS Key Laboratory of Marginal Sea Geology;South China Sea Institute of Oceanology;Chinese Academy of Sciences;Guangzhou 510301;Guangdong;China;2.Graduate University of Chinese Academy of Sciences;Beijing 100049;3.Department of Earth Sciences;Sun Yat-Sen University;Guangzhou 510275;China |
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| Abstract: | The Qiongdongnan basin is a Tertiary extensional basin developed on the north margin of South China Sea,with a main structural style of half-grabens.Three types of half-grabens,which are rotational,rollover and rotational,have been identified after analyzing the geometry of the half-grabens from the seismic sections in the basin.The half-grabens mainly experienced two evolutionary stages,which were from middle Eocene to early Oligocene and from late Oligocene to early Miocene.Meanwhile,the half-graben's evo... |
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| Keywords: | half-graben structural style Qiongdongnan basin north margin of South China Sea |
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