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为了研究南海北部张裂大陆边缘的地壳热结构,利用船载测量磁力数据,通过功率谱方法反演南海北部陆缘居里等温面,并结合深地震剖面、区域断裂及大地热流分布,讨论了深部热结构状态.结果显示研究区居里面深度在13～26km之间,在上下陆坡转换带处与莫霍面相交,北东向断裂多位于居里面梯度带上,北西向断裂多具有分割、错断的特点,居里面深度和大地热流值具有相关性.结果揭示了陆架、上陆坡地区磁性体可能主要位于上地壳和下地壳上部,下陆坡及洋壳区地壳与地幔顶部有被磁化的迹象.磁静区位于居里面上隆区边缘,F3断裂和F4断裂之间可能是残留古洋壳.潮汕凹陷和台西南盆地中央隆起是发生底侵的主要区域,F2断裂为其北界.
In order to study the crustal thermal structure at the cracked continental margin in the northern South China Sea, the in-situ measurement of magnetic force data and the inversion of the Curie isothermal surface in the northern South China Sea by power spectrum method are carried out. Combined with the distribution of deep seismic sections, regional faults and the geothermal flow, Deep thermal structure.The results show that the depth of the inside of the study area is between 13km and 26km and intersects with the Moho at the transition zone between the up and down slope and the north eastward fault is mostly located in the inland gradient zone, The results show that the magnetic body may be mainly located in the upper crust and the upper crust of the upper continental shelf, while the continental shelf and the crust of the lower crust and the top of the mantle are magnetized The magnetotactic zone is located at the margin of Shangli area in the center, and the remnant paleo-oceanic crust may be between the F3 and F4 fractures.The central uplift of the Chaoshan and Taixinan basins is the main area where undergrowth occurs and the F2 fault is the northern boundary.