| 琼东南盆地北礁凹陷伸展构造的几何学分析 |
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| 引用本文： | 龙根元, 吴世敏, 曾广东. 琼东南盆地北礁凹陷伸展构造的几何学分析[J]. 海洋地质与第四纪地质, 2010, 30(3): 71-77. doi: 10.3724/SP.J.1140.2010.03071 |
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| 作者姓名： | 龙根元 吴世敏 曾广东 |
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| 作者单位： | 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;中石化,上海海洋油气分公司,上海,200120 |
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| 基金项目： | 国家自然科学基金项目(40576025) 国家重点基础研究发展规划项目(2007CB411706-05) |
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| 摘 要： | 北礁凹陷作为琼东南盆地南部深水区的一个典型半地堑凹陷,层序地层具有明显的膝折变形特征,几何学分析显示出伸展断层转折褶皱模型特点。经过对凹陷内部构造变形的测量和推算,本文确定了北礁凹陷断层转折褶皱的构造几何学特征及其运动学过程,揭示了凹陷主要裂谷阶段的水平伸展量,其总的伸展量可达到12 km,平均伸展速率约为0.44 km/Ma。通过构造几何学方法推测始新世末期该区域海平面上升了约200 m。并运用伸展断层转折褶皱理论,按照平衡剖面原理,正演了北礁凹陷及北礁低隆起的伸展构造发育过程。
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| 关 键 词： | 伸展断层转折褶皱 平衡剖面 北礁凹陷 琼东南盆地 |
| 收稿时间： | 2009-12-24 |
| 修稿时间： | 2010-03-09 |
STRUCTURAL GEOMETRY OF THE BEIJIAO SAG OF THE QIONGDONGNAN BASIN |
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| LONG Genyuan, WU Shimin, ZENG Guangdong. STRUCTURAL GEOMETRY OF THE BEIJIAO SAG OF THE QIONGDONGNAN BASIN[J]. Marine Geology & Quaternary Geology, 2010, 30(3): 71-77. doi: 10.3724/SP.J.1140.2010.03071 |
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| Authors: | LONG Genyuan WU Shimin ZENG Guangdong |
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| Affiliation: | 1 CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 310301, China;;; 2 Department of Earth Sciences, Sun Yat-Sen University, Guangzhou 510275, China;;; 3 Institute of SINOPEC Shanghai Offshore Oil and Gas Company, Shanghai 200120, China |
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| Abstract: | As a typical half-graben in the deep water area of the southern Qiongdongnan basin, the Beijiao sag with the leg bend-like deformation of its sequence stratigraphy is consistent with the model of extensional fault-bend fold. Using the theory of extensional fault bend fold and balanced cross-section, we reconstructed the evolutionary process of the Beijiao sag and Beijiao low-uplift in terms of extentional tectonics. After analysing and measuring the structural deformation of the sag, the geometric character and kinematic process of the fault bend fold are established. It is estimated that the sag totally extended 12 km with an average extension rate of 0.44 km/Ma during the period from 50 Ma to 23 Ma, and the sea level of this area rose about 200 m by the end of Eocene. |
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| Keywords: | extensional fault-bend fold balanced cross-section Beijiao sag Qiongdongnan basin |
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