| 珠江口盆地白云凹陷裂后异常沉降研究及成因分析 |
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| 引用本文： | 付洁,黎明碧,唐勇,邱文弦,王辉. 珠江口盆地白云凹陷裂后异常沉降研究及成因分析[J]. 海洋学研究, 2013, 31(1): 1-15 |
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| 作者姓名： | 付洁 黎明碧 唐勇 邱文弦 王辉 |
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| 作者单位： | 1.国家海洋局 第二海洋研究所,浙江 杭州 310012; 2.国家海洋局 海底科学重点实验室,浙江 杭州 310012; 3.浙江大学 地球科学系,浙江 杭州 310027; 4.中国地质大学 资源学院,湖北 武汉 430074; 5.中国石油测井有限公司,陕西 西安 710201 |
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| 基金项目： | 国家重点基础研究发展计划资助项目(2007CB41170301);国家海洋公益性行业科研专项经费资助项目(200805078、201205003);国家自然科学基金青年基金资助项目(40906037);国家海洋局第二海洋研究所基本科研业务费专项资金资助项目(JG1007) |
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| 摘 要： | 南海北部大陆边缘的许多盆地都发现了裂后沉降异常,位于深水陆坡区的白云凹陷是其中的典型代表。本文采用盆模软件Temis Suite 2007对穿过白云凹陷的3条地震剖面进行回剥分析,观测其不同时间基底的垂向运动特征,并将其与MCKENZIE经典拉张模型计算的理论裂后沉降值进行对比,发现白云主凹中心的裂后异常沉降量最大超过2.6 km,白云南凹最大异常沉降量接近2 km,高于白云凹陷北部边缘的异常沉降。凹陷东部的裂后沉降作用强于凹陷西部。对沉降曲线的研究发现,白云凹陷在中中新世(16.5～10.5 Ma)期间有一段沉降明显加速的过程,白云南凹尤为明显,可能与南海扩张停止事件有关。白云凹陷发育了巨厚的沉积,并且呈韧性伸展状态,本文认为下地壳流可能是导致白云凹陷裂后异常沉降最主要的因素。
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| 关 键 词： | 白云凹陷 裂后异常沉降 盆地反演模拟 沉降分析 南海 |
| 收稿时间： | 2011-06-29 |
Post-rift subsidence anomaly and its mechanism in the Baiyun Sag,Pearl River Mouth Basin |
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| FU Jie,LI Ming-bi,TANG Yong,QIU Wen-xian,WANG Hui. Post-rift subsidence anomaly and its mechanism in the Baiyun Sag,Pearl River Mouth Basin[J]. Journal of Marine Sciences, 2013, 31(1): 1-15 |
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| Authors: | FU Jie LI Ming-bi TANG Yong QIU Wen-xian WANG Hui |
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| Affiliation: | 1. Second Institute of Oceanography, SOA, Hangzhou 310012, China; 2. Laboratory of Submarine Geosciences, SOA, Hangzhou 310012, China; 3. Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China; 4. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China; 5. China Petroleum Logging Co., Ltd, Xi'an 710201, China |
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| Abstract: | Post-rift subsiding anomalies have been discovered in many basins in the northern continental margin of South China Sea, of which Baiyun Sag is a typical one. We used software Temis Suite 2007 to build the backstripping model of three NNW—SEE-oriented seismic profiles crossing the Baiyun Sag, and analyzed the post-rift subsidence. The results show that the Baiyun Sag experienced anomalous post-rift subsidence. Compared with the Mckenzie's classic port-rift subsidence model, the Main Baiyun Sag subsided over 2.6 km deeper and the Southern Baiyun Sag subsided nearly 2 km. An accelerated subsidence stage could be conducted during 16.5~10.5 Ma, which might relate to the end of sea-floor spreading in the South China Sea. The ductile extension and extreme quick and thick deposition in the Baiyun Sag indicate that the lower-crustal flow might have been the mechanism for the anomaly subsidence. |
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| Keywords: | Baiyun Sag anomaly post-rift subsidence backstripping modeling subsidence analysis South China Sea |
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