下扬子区新生代构造变形物理模拟及其主控因素

发布时间：2018-10-19 16:39

【摘要】：下扬子新生代构造变形是中国东部新生代构造研究的重要窗口。为研究其变形机制,基于构造物理模拟,对4个主控因素进行评价与研究。设计对比实验,分析了在不同主控因素的作用下,下扬子区新生代构造的变形过程。应力与模型边界的角度和施加应力的边界位置是下扬子新生代构造变形的最优主控因素。在东侧全段挤压和东侧北段挤压的对比实验中,郯庐断裂带与下扬子及其周缘块体的构造变形均呈现显著变化;在块体厚度的对比实验中,变形与变位状态近似相同,但隆升特征存在显著差别,东西两侧边界挤压效果具有显著差异;与此同时,施加应力与模型边界角度越小,郯庐断裂带呈现右行走滑特征越明显。在最优主控因素模型中,下扬子块体新生代区域伸展构造变形与郯庐断裂带右旋走滑共同构成了一个"右旋侧向扩展变形"构造系统。
[Abstract]:The Cenozoic tectonic deformation in Lower Yangtze is an important window for the study of Cenozoic structures in eastern China. In order to study its deformation mechanism, four main control factors were evaluated and studied based on structural physical simulation. A comparative experiment was designed to analyze the deformation process of Cenozoic structures in the Lower Yangtze region under the action of different main controlling factors. The angle between stress and model boundary and the boundary position of applied stress are the optimal main factors controlling the tectonic deformation of the Lower Yangtze during the Cenozoic. The tectonic deformation of the Tan-Lu fault zone and the lower Yangtze and its surrounding blocks show significant changes in the contrast experiments of the whole section of the east side and the northern segment of the east side, and the deformation and the displacement state are approximately the same in the contrast experiment of the thickness of the block. At the same time, the smaller the angle between the applied stress and the model boundary, the more obvious the characteristics of right strike-slip in the Tan-Lu fault zone. In the optimal dominant factor model, the Cenozoic regional extensional tectonic deformation of the Lower Yangtze block and the right-lateral strike-slip of the Tanlu fault zone constitute a "dextral lateral spreading deformation" tectonic system.
【作者单位】：中国地质大学(武汉);中国国土资源航空物探遥感中心;同济大学海洋与地球科学学院;中海石油(中国)有限公司上海分公司;成都理工大学油气藏地质及开发工程国家重点实验室;
【基金】：国家科技重大专项项目(2011ZX05023-003)资助
【分类号】：P542

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