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南海东北部及邻区,特别是洋陆转换带地区的复杂地壳结构特征一直是南海岩石层结构研究的热点.本文在Pn波地震层析成像结果和深部地震探测剖面的约束下,利用重力数据建立该区两条剖面的密度模型.两条重力剖面二度半密度正反演的拟合结果支持琼粤隆起至吕宋岛弧区一带的地壳结构中存在下地壳高速层的观点,同时认为台西南盆地的拟合结果表明南部凹陷区仍属于过渡型地壳.本文认为剖面AA′和剖面BB′的构造属性虽然均总体倾向于火山岩型,但二者的地质结构并不完全一致,表明了北部陆缘深部结构的横向差异与构造属性的复杂.
The complicated crustal structure in the northeastern South China Sea and its adjacent areas, especially in the land-sea transition zone has been a hotspot in the research of the rock strata structure in the South China Sea.Under the constraints of Pn seismic tomography and deep seismic exploration profiles, The density model of two sections in the area is established.The fitting results of two half-density inversion of gravity in the two sections support the view that the crustal structure in the area from the Qiongyue uplift to the Luzon arc area has the lower crustal high-velocity layer, The fitting results of the southwestern Taiwan basin show that the southern depression still belongs to the transitional crust. Although the tectonic properties of both section AA ’and section BB’ tend to volcanic rocks in general, the geological structures of the two sections are not exactly the same, The Lateral Differences and Structural Attributes of Deep Structures in Northern Continental Margins.