东海陆架盆地南部中生代成盆过程的数值模拟

发布时间：2018-08-07 11:06

【摘要】：采用I2VIS有限差分方法,模拟了东海陆架盆地南部中生代的盆地演化过程。数值模型的构建主要基于研究区域内现有的地震剖面、测井、层析成像等资料获得的中生代地层结构特征。根据模拟结果,对比已知的岩浆侵入特征和断裂组合规律,定量分析了在不同边界条件下,各阶段盆地演化的岩浆断裂及沉积特征,并探讨了影响盆地构造特征的主要因素。得出以下认识:(1)通过改变模型的边界条件发现,层状含水地幔在拉伸环境下,会对地壳结构造成破坏,中生代东海陆架盆地区域性伸展不是盆地演化过程的唯一主控因素。(2)东海陆架盆地中生代的成盆过程及属性与中生代时期上地幔物质流动有着密切关系。(3)中生代的地幔物质流动导致的大规模岩浆事件很可能作用于闽江凹陷之下,由此导致了闽江凹陷的进一步抬升,形成现今的斜坡带,而基隆凹陷进一步沉降,形成凹陷的沉积中心。基于以上结论,认为区域性伸展和上地幔物质流动导致的岩浆上涌两大因素共同控制下,影响了东海陆架盆地南部中生代的演化。
[Abstract]:The I2VIS finite difference method is used to simulate the Mesozoic basin evolution in the southern shelf basin of the East China Sea. The construction of the numerical model is mainly based on the Mesozoic stratigraphic characteristics obtained from the existing seismic profiles, logging, tomography and other data in the study area. Based on the simulation results, the known characteristics of magmatic intrusion and fault assemblage are compared, and the magmatic faults and sedimentary characteristics of basin evolution in different stages under different boundary conditions are quantitatively analyzed, and the main factors affecting the tectonic characteristics of the basin are discussed. The following conclusions are obtained: (1) by changing the boundary conditions of the model, it is found that the layered water-bearing mantle will destroy the crustal structure in the extensional environment. The regional extension of the Mesozoic East China Sea shelf basin is not the only dominant factor in the evolution of the basin. (2) the Mesozoic basin formation process and its attributes are closely related to the Mesozoic upper mantle material flow. The massive magmatic events caused by the flow of mantle materials in the Minjiang sag are likely to act under the Minjiang sag. This resulted in the further uplift of Minjiang sag, the formation of the present slope zone, and the further subsidence of the Keelung sag, which formed the sedimentary center of the sag. Based on the above conclusions, it is considered that the Mesozoic evolution of the southern shelf basin of the East China Sea was influenced by two major factors, namely, regional extension and magmatic upwelling caused by the upper mantle material flow.
【作者单位】：海底科学与探测技术教育部重点实验室中国海洋大学海洋地球科学学院;青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室;中国地质调查局青岛海洋地质研究所;中国石油大学;
【基金】：国家自然科学基金(41325009,41402172,41476053,41506080) 山东省泰山学者特聘教授项目鳌山卓越科学家计划(2015ASTP-0S10) 国家重点研发计划项目(2016YFC060100)
【分类号】：P736.1

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