| 白云深水区新生代沉降及岩石圈伸展变形 |
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| 引用本文： | 赵中贤,孙珍,谢辉,颜承志,李元平.白云深水区新生代沉降及岩石圈伸展变形[J].地球物理学报,2011,54(12):3336-3343. |
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| 作者姓名： | 赵中贤 孙珍 谢辉 颜承志 李元平 |
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| 作者单位： | 1. 中国科学院边缘海地质重点实验室,中国科学院南海海洋研究所,广州 510301;
2. 中国科学院研究生院,北京 100049;
3. 中海石油(中国)有限公司深圳分公司研究院,广州 510240 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家科技重大专项 |
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| 摘 要： | 为认识白云深水区新生代构造沉降和岩石圈伸展变形特征,本文对过研究区的两条测线进行了回剥分析和伸展系数计算,结果表明:白云深水区新生代构造沉降具有幕式特点,由快到慢共分4幕:①65～24.4 Ma;②24.4～18.5 Ma；③18.5～13.8 Ma;④13.8～0 Ma,在裂后存在3期快速沉降(24.4～21Ma,1...
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| 关 键 词： | 沉降 伸展系数 岩石圈 白云深水区 |
| 收稿时间： | 2011-08-02 |
Baiyun deepwater cenozoic subsidence and lithospheric stretching deformation |
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| ZHAO Zhong-Xian
,
SUN Zhen
,
XIE Hui
,
YAN Cheng-Zhi
,
LI Yuan-Ping.Baiyun deepwater cenozoic subsidence and lithospheric stretching deformation[J].Chinese Journal of Geophysics,2011,54(12):3336-3343. |
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| Authors: | ZHAO Zhong-Xian SUN Zhen XIE Hui YAN Cheng-Zhi LI Yuan-Ping |
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| Institution: | 1. Key Laboratory of Marginal Sea Geology, Chinese Academy of Sciences, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;
2. Graduate Univ. of Chinese Academy of Sciences, Beijing 100049, China;
3. Institute of Science and Technology, Shenzhen Branch, China National Offshore Oil Corporation, Guangzhou 510240, China |
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| Abstract: | Through backstripping and stretching factor calculating of two profiles across Baiyun Deepwater, the characteristics of Cenozoic subsidence and lithospheric stretching deformation are revealed. Baiyun deepwater is characterized by four episodes of tectonic subsidence during Cenozoic,① 65~24.4 Ma;② 24.4~18.5 Ma;③ 18.5~13.8 Ma;④ 13.8~0 Ma. There exist three fast subsidence periods (24.4~21 Ma,18.5~16.5 Ma,13.8~10.5 Ma) and four slow or uplift periods (30~24.4 Ma,21~18.5 Ma,16.5~13.8 Ma,10.5~0 Ma). Syn-rift subsidence varies from 200~2100 m and that of post-rift from 1000~1500 m, which are all related to basement topography. Stretching factor of lithosphere calculated from syn-rift subsidence changes from 1 to 7 and has the same trend as crust stretching factor. Anomalous subsidence of about 300~700 m generated during post-rift which is inversely proportional to basement topography, about 600 m anomalous subsidence in the uplift and 300 m in the sag which is probably related to the differential subsidence of uplift and sag induced by lithosphere breakup. |
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| Keywords: | Subsidence Stretching factor Lithosphere Baiyun deepwater |
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