摘要
东海磁场区域上呈现“东西分带、南北分块”的格局,根据磁场特征,自西向东可分为六个磁场区,为东海区域构造分区提供了地球物理场依据。东海磁场特征主要反映了上地壳的构造特征。本文结合东海断面重磁曲线的拟合成果,讨论了东海地壳结构、块体对接等问题。我们认为东海基底是晚中生代后由不同块体在不同时代对接而成,由西向东基底年代越来越新,地壳结构也由典型的陆壳过渡到典型的洋壳。
The magnetic field on the East China Sea exhibits a eastwest belted and south-north partitioned pattern, which can be subdivided into six regions to provide geophysical evidence for structure partition. The magnetic field on the East China Sea shows mainly structure feature in upper crust. Fitting gravity and magnetic curves on the crustal section of the East China Sea, we propose that the base of the East China Sea consists of different blocks connected at different times after the Late Mesozoic, the basement of which is transformed west to east from older to younger; and the crust from typical continental to typical oceanic.
关键词
东海
磁场
地壳断面
地壳结构
the East China Sea, magnetic field, crustal section, block connecting.
