| 下扬子区新生代伸展构造变形及其区域构造意义 |
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| 引用本文： | 徐曦,高顺莉,王兴建,黄俊菠,王博.下扬子区新生代伸展构造变形及其区域构造意义[J].地球科学,2015,40(12):1968-1986. |
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| 作者姓名： | 徐曦 高顺莉 王兴建 黄俊菠 王博 |
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| 作者单位： | 1.同济大学海洋与地球科学学院，上海 200092 |
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| 基金项目： | 国家科技重大专项项目2011ZX05023-003 |
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| 摘 要： | 下扬子区是中国东部重要的含油气盆地区之一，其新生代伸展构造变形一直是下扬子新生代构造动力学的核心问题.通过对下扬子海陆全区新生代断陷盆地结构与构造格局分析，明确了下扬子区伸展构造变形特征，探讨了变形成因机制及其区域构造意义.区域构造分析表明，下扬子区伸展变形构造由一系列NNE-NE-NEE走向的总体呈弧形展布的正断层构成，表现为受伸展断裂系统控制的断陷结构，具有多向伸展特征，自南向北可分为江南、沿江-苏北-南黄海和南黄海北部3个构造伸展区.有限元数值与构造物理模拟表明，受控于太平洋板块俯冲推挤传递至陆内的侧向构造作用力，下扬子块体南向蠕移，区域上近南北向伸展变形，郯庐断裂右旋走滑，两者共同构成一个"右旋侧向扩展变形"系统.在区域构造上，大兴安岭-太行山-武陵山重力梯度带以东的中国东部新生代伸展变形构造和盆地成因与古太平洋板缘边界条件密切相关.
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| 关 键 词： | 下扬子区 伸展构造变形 数值模拟 构造物理模拟 构造 |
| 收稿时间： | 2015-05-20 |
Cenozoic Deformation of Extensional Tectonics in the Lower Yangtze Region and Its Tectonic Significance |
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| Abstract: | The Lower Yangtze region is an important area including hydrocarbon basins in eastern China, where Cenozoic tectonic deformation is the core of Cenozoic tectonic dynamics. In order to better understand the mechanism of extensional tectonics and the implications, the structure and framework of the Cenozoic fault basin in the Lower Yangtze region are studied. The regional basin structure reveals that the extensional structure is composed of a series of normal faults with totally arc-like changing strikes from NNE, to NE, and to NEE, displaying multidirectional extension and fault depression structure controlled by extensional fault system in the Lower Yangtze region, which can be divided into three extensional regions from south to north: Jiangnan extensional region, Yanjiang-Subei-South Yellow Sea extensional region, and northern South Yellow Sea extensional region. The numerical and structural physical simulations reveal that, subjected to the lateral tectonic stress triggered by the subduction of the Pacific plate beneath the Eurasian plate, the Lower Yangtze block moves laterally and extends regionally, and the Tan-Lu fault slips dextrally, which have formed a tectonic deformation system with dextral strike slip of Tan-Lu fault and lateral extension of Lower Yangtze block. Tectonically, Cenozoic extensional tectonics and formation mechanism of basins in the east of the Daxing'anling-Taihangshan-Wulingshan gravity lineament have been closely related to boundary condition of the Paleo-Pacific plate. |
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