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| 琼东南盆地基底特征及其构造演化 | |
| 引用本文： | 刘兵,吴世敏,龙根元,郭翔艳.琼东南盆地基底特征及其构造演化[J].地球物理学进展,2012,27(4):1465-1475. |
| 作者姓名： | 刘兵 吴世敏 龙根元 郭翔艳 |
| 作者单位： | 1. 中国科学院边缘海重点实验室,中国科学院南海海洋研究所,广州510301;中国科学院研究生院,北京100039;海南省地质调查院,海口570206 2. 中国科学院边缘海重点实验室,中国科学院南海海洋研究所,广州510301;中山大学地球科学系,广州510275 3. 中国科学院边缘海重点实验室,中国科学院南海海洋研究所,广州510301;中国科学院研究生院,北京100039 |
| 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)联合资助 |
| 摘 要： | 本文通过处理琼东南盆地现有的重磁数据资料,得到琼东南盆地重磁特征,并采用三维Parker法进行重磁基底深度的反演,获得琼东南盆地的重力基底深度变化在1～11 km之间,磁力基底深度变化在5～11 km之间,结合地震剖面的重磁震联合反演结果和钻井资料推断琼东南盆地的基底岩性主要以酸性花岗岩和中性安山岩为主,少量陆相中生界地层.琼东南盆地的基底演化表现为早期主要与古特提斯洋的演化相关,晚期则与太平洋板块的俯冲密切相关. |
| 关 键 词： | 琼东南盆地 三维Parker法 重磁基底 基底岩性 构造演化 |
Basement characteristics and tectonic evolution in Qiongdongnan basin |
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| LIU Bing , WU Shi-min , LONG Gen-yuan , GUO Xiang-yan.Basement characteristics and tectonic evolution in Qiongdongnan basin[J].Progress in Geophysics,2012,27(4):1465-1475. | |
| Authors: | LIU Bing WU Shi-min LONG Gen-yuan GUO Xiang-yan |
| Institution: | 1,2(1.Key Laboratory of Marginal Sea Geology,Chinese Academy of Sciences/South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou510301,China; 2.Graduate University of Chinese Academy of Sciences,Beijing100039,China; 3.Hainan Institute of Geological Survery,Haikou570206,China; 4.Department of earth sciences,Sun Yat-Sen University,Guangzhou510275 China) |
| Abstract: | On the basis of processing gravity and magnetic data in Qiongdongnan basin,the gravity and magnetic characteristics were obtained.Inverted calculation was conducted on the gravity and magnetic basement depth by using Three-dimensional Parker Process.The result shows that the gravity basement depth varies from 1km to 11km while the magnetic basement depth from 5km to 11km.The difference between gravity and magnetic basement depth may result from Mesozoic sedimentary found in the seismic profiles.Furthermore,by contrast with the seismic profiles and well data,the basement characteristics of Qiongdongnan basin were analyzed.The evolutionary history of the basement concluded as follows: Both the South China Block and Indo-China Block belong to the Gondwana super continent from their crystal basement comparison.The South China Block drift from the Gondwana continent from Carboniferous and ocean between the south china block and Indo-china block called the northern branch of Paleo-Tethys.After late Triassic,the two blocks collided and the Paleo-Tethys disappeared and gave rise to the uplift of the NW South China Sea.So that the Mesozoic marine sediments absent in this area. |
| Keywords: | Qiongdongnan basin three-dimensional Parker Process Gravity and magnetic data model basement tectonic evolution |
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