INTEGRATED INTERPRETATION OF GRAVITY, MAGNETIC AND SEISMIC DATA FOR DETECTING IGNEOUS ROCKS IN THE EAST CHINA SEA
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摘要: 利用1:100万上海幅海洋区域地质调查项目最新获得的重力、磁力和多道地震数据,根据研究区内重、磁场特征,以及已知的火成岩发育状况,在数据处理的基础上,通过剖面和平面相结合,对东海海底的火成岩进行了推断解释,从而得到火成岩在空间上的展布位置。分析认为东海海底火成岩具有沿北北东向成带发育的特点,沿深大断裂侵入于中生代地层;北北西向火成岩带发育时间较晚,规模小,与北西向断裂形成较晚相对应,火成岩分布呈现东西分带的特点,陆架盆地中低部隆起为喜马拉雅早-中期岩浆岩。Abstract: Using the latest gravity, magnetic and seismic data acquired by the marine geological survey project of Shanghai sheet on the scale of 1:1000,000, this paper analyzed the characteristics of gravity and magnetic fields in addition to the structural and lithological interpretation of seismic profiles. Helped by the geophysical features of the known igneous rocks, we inferred the distribution pattern of the igneous rocks in the East China Sea. Our results show that in the East China Sea, igneous rocks largely intrude in the Mesozoic along deep faults and extend in zones along the NNE direction. The small scale NWW trending igneous rocks erupted in later stage follow the later formed NW faults, and are distributed as stripes in E-W. And the early and middle Himalayan magmatic rocks occur in the central uplift of the East China Sea Shelf Basin.
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