| 南沙地块内破裂不整合与碰撞不整合的构造分析 |
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| 引用本文： | 孙珍,赵中贤,李家彪,周蒂,王章稳.南沙地块内破裂不整合与碰撞不整合的构造分析[J].地球物理学报,2011,54(12):3196-3209. |
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| 作者姓名： | 孙珍 赵中贤 李家彪 周蒂 王章稳 |
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| 作者单位： | 1. 中国科学院南海海洋研究所边缘海地质重点实验室,广州 510301;
2. 国家海洋局第二海洋研究所,杭州 310012 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，中国科学院知识创新工程重要方向项目群项目，国家科技重大专项 |
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| 摘 要： | 廷贾断裂以东的南沙地块与南海北部陆缘共轭,因此其构造过程研究对认识整个南海的构造演化具有重要意义.地震资料和区域构造背景分析揭示,破裂不整合面(BU)和碰撞不整合面(CU)是控制南沙地块内盆地演化的骨架界面；为了揭示南沙地块内的主要构造过程,本文利用地震剖面分析和数值模拟的方法,侧重对两个重要界面开展构造分析.结果显示...
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| 关 键 词： | 南沙地块 破裂不整合(SCSU) 碰撞不整合(CU) 前隆 岩石圈强度 |
| 收稿时间： | 2011-08-16 |
Tectonic analysis of the breakup and collision unconformities in the Nansha |
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| SUN Zhen
,
ZHAO Zhong-Xian
,
LI Jia-Biao
,
ZHOU Di
,
WANG Zhang-Wen.Tectonic analysis of the breakup and collision unconformities in the Nansha[J].Chinese Journal of Geophysics,2011,54(12):3196-3209. |
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| Authors: | SUN Zhen ZHAO Zhong-Xian LI Jia-Biao ZHOU Di WANG Zhang-Wen |
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| Institution: | 1. CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China;
2. The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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| Abstract: | Nansha block on the east of Tinjar fault (or called Baram Line) is the conjugate counterpart of the Northern continental margin. A research on Nansha block will contribute greatly to the study of the South China Sea evolution. Seismic profiles interpretation and regional tectonic analysis suggested that two unconformities as Breakup Unconformity (BU) and Collision Unconformity (CU) are two most important boundaries, which constitute the evolutionary frame of the Nansha area. In order to reveal the main tectonic process in Nansha block, seismic profiles constrained with drilling data and mathematical modeling were carried out, the main results are as follows. BU is revealed to be a diachronic boundary and dated early Miocene in Liyue basin to the east, while to the west the Beikang and Nanweixi basin is dated middle Miocene around 16 Ma, where B.U. is synchronous with CU. The CU in the east of Nansha block is around 16 Ma. The boundaries after CU are also synchronous, but the rifting boundaries before BU might also be diachronic. Compared the depth as well as the Empty Basin Subsiding Rate (EBSR) simulation, we found that Nansha block experienced deflection since Tg in the middle and west part accompanied with the subduction and the collision thereafter. On 90N09 and 94N07, the top of the forebulge rose to the highest around 16 Ma. The deflection is strong in the west and weak in the east, the position of the forebulge migrates differently. We conjecture that the deflection of the block might be controlled by factors as collision time, lithospheric strength, or oceanic width of the subducted proto South China Sea. |
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| Keywords: | Nansha block Breakup unconformity in Nansha(SCSU) Collision Unconformity(CU) Forebulge Lithospheric strength |
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