基于重磁场的延边微板块地壳结构特征研究

发布时间：2018-06-29 00:22

本文选题：延边 + 重磁　；参考：《地质学报》2017年09期

【摘要】：延边地区位于多个微板块的结合部位,区内发育长白山活动火山群,地震活动频繁。本文通过重磁小波多尺度分解与莫霍面、居里面深度反演分析,研究延边地区的微板块地壳结构特征。其中敦化-密山断裂以东的胶辽地块地壳厚度最大,约38~40km,兴凯地块则最小,约34~36km,敦化-密山断裂以西的松嫩地块地壳厚度变化平缓,约36~37km;NE向敦化-密山断裂为延边地区的一级断裂,切穿莫霍面,为松嫩地块的东侧边界;NW向展布的富尔河-红旗河断裂、秋梨沟老头沟断裂与汪清-敬信断裂则属于胶辽地块与兴凯地块之间的缝合带,控制居里面分区及形态,而居里面隆起区及其边缘则多分布火山口,表明居里面的局部隆起与岩浆活动关系密切。
[Abstract]:Yanbian area is located in the combination of several microplates, Changbai Mountain active volcanoes are developed in the area, and seismic activity is frequent. In this paper, the crustal structure characteristics of microplate in Yanbian area are studied by means of gravity and magnetic wavelet multiscale decomposition and Moho surface inversion analysis. The crust thickness of Jiaoliao block to the east of Dunhua-Mishan fault is the largest, about 38 ~ 40km, and that of Xingkai block is the smallest, about 34 ~ 36km. The crustal thickness of Songnen block to the west of Dunhua-Mishan fault changes slowly. The NE-trending Dunhua-Mishan fault is a first-order fault in Yanbian area, which cuts through Moho, and is the Fuhe-Red Fur River fault with the eastern boundary of Songnen block. The Laotougou fault of Qiuligou and Wangqing-Jingxin fault belong to the suture zone between Jiaoliao block and Xingkai block, which control the zonation and shape of the dwelling area, while the crater is distributed in the uplift area and its edge. It shows that the local uplift in the dwelling is closely related to magmatic activity.
【作者单位】：中国地震局地壳应力研究所地壳动力学重点实验室;中国地质大学(武汉)信息工程学院;
【基金】：中国地震局地壳应力研究所基本科研业务专项(ZDJ2012-15)资助的成果
【分类号】：P313

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