人们普遍认为大陆架基底是其毗连的大陆岩石圈的一部分.但通过分析整个中国东部侏罗纪-白垩纪花岗岩类的时空分布,我们不难得出结论——中国东海、南海之下的大陆架基底是与中国东部大陆岩石圈无关的外来地体.此外来地体规模大、密度低、浮力大,所以难以俯冲到地幔.这个外来体最有可能是中生代的大洋高原,但更有可能是微陆块,伴随着NW向俯冲的古太平洋板块飘移而来.古太平洋板块的俯冲,可有效解释~190 Ma至~88Ma中国东部花岗岩类的成因.整个中国大陆东部最年轻的花岗 It is generally accepted that the continental shelf basement is part of its contiguous continental lithosphere.But by analyzing the temporal-spatial distribution of Jurassic-Cretaceous granitic rocks in eastern China, it is not difficult to conclude that the continental shelf basement beneath the East China Sea and the South China Sea is In addition, the alluvial terrain, which is unrelated to the lithosphere in the eastern Chinese mainland, has the characteristics of large scale, low density and large buoyancy so that it is difficult to subduct into the mantle, most likely the Mesozoic oceanic plateau, With the subduction of the NW Pacific subducted Paleo-Pacific plate. The subduction of the Paleo-Pacific plateau can effectively explain the genesis of the granites in eastern China from ~ 190 Ma to ~ 88 Ma. The youngest granite in eastern China