| 摘要: |
| 运用平衡剖面技术对珠江口盆地深水区珠二坳陷的典型测线进行构造演化史恢复，计算不同构造时期的拉张 速率及沉积速率等参数,总结其构造沉积演化特征。结果表明:珠二坳陷的构造演化过程可以分为裂陷期和拗陷期 两个发育阶段;23 Ma之前为裂陷期，伸展作用十分强烈,主要断裂构造发育;23 Ma后为裂后的拗陷期,伸展作用减 弱;坳陷新生代拉张系数为1.15-1.35,不同凹陷在拉张作用、沉积速率和断裂发育方面具有明显的差异；白云凹陷 裂陷期发育陆相断陷湖相和水下三角洲沉积,拗陷期发育深水扇和深海沉积序列s |
| 关键词: 珠江口盆地 深水区 平衡剖面 构造演化 |
| DOI： |
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| 基金项目:中国科学院重要方向性项目(KZCX2-YW-203);中国科学院边缘海地质重点实验室开放基金项目(MSGL08-22);国家“973”重 点基础研究项M (2007CB411703) |
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| Cenozoic tectonic and sedimentary evolution of deepwater area, Pearl River Mouth Basin |
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DONG Dong-dong1,2,WANG Da-wei1,ZHANG Gong-cheng3,WU Shi-guo1,4,YUAN Sheng-qiang1,5
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(1.Key Laboratory of Marine Geology and Environment, Institute of Oceanology,Chinese Academy of Sciences t Qingdao 266071, China;2. CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology,Chinese Academy of Sciences, Guangzhou 510301，China ;3. CNOOC Research Center, Beijng 100027，Chirm ;4. College of Geo-Resource and information in China University of Petroleum，Qingdao 266555，China;5. Graduate School of Chinese Academy of Sciences, Beijing 100049, China)
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| Abstract: |
| Balanced cross-section technique was applied to restore tectonic evolution history of the representative seismic lines in the deepwater area of Zhuer depression, Pearl River Mouth Basin，The extensional rate and deposition rate were calculated to discuss the tectonic and sedimentary evolution. The results show that the structural evolution of Zhuer depression could be generally divided into two stages of syn-rift and post-rift. The syn-rift stage is before 23 Ma, when extension and fractrue were strong, and the major faults developed well. The post-rift stage is after 23 Ma, when the extension was weaking. The total stretching factor of the depression is between 1. 15 and 1. 35. There are obvious difference in the extension, deposition rate and fault development among the different sags. The Baiyun sag developed the syn-rift sequence of lacustrine deposits and submerged delta, followed by the post-rift sequence of deepwater fans and pelagic deposits. |
| Key words: Pearl River Mouth Basin deepwater aiea balanced cross-section structural and sedimentary evolution |
