大陆下地壳研究的新进展

伴随地球物理、捕虏体岩石学、同位素年代学等方面新资料的不断丰富，大陆深部地质作用及其过程的研究取得了不少新进展。重建下地壳的形成和改造历史，对探讨岩石圈的演化变动具有十分重要的意义。幔源岩浆分异作用、板底垫托作用及局部地壳熔融等在太古代至今下地壳的形成改造和麻粒岩相变质事件中起着关键的作用。活化大陆岛弧的下地壳较为全面地记录了下地壳复杂的演化历史，它是我们研究大陆动力学富有前景的构造区域。

NEW ADVANCES IN RESEARCH CONCERNING THE CONTINENTAL SUBCRUST

With the increasing of the new data on geophysics, petrology and isochronology of xenoliths, many new advances are observed in the researches on deep continental geology. The reconstruction of the history for the formation and reformation of the subcrust is of an important significance to the evolution and alteration of the lithosphere. The differentiation of mantle derived magma, underplating and partial melting of the crust, have played an important role in the formation and reformation of the continental subcrust and in the metamorphism of granulite factes. The subcrust of the activiated continental islands can be defined to be prospective tectonic regions for our research into the continental geodynamics, because the complicated evolutionary history of the continental subcrust has been recorded to a great extent in the rocks there.