摘要
近20年来,中外学者研究认为,拆沉作用导致大陆岩石圈物质快速下沉入软流圈中,伴随大规模的岩浆作用,山脉隆升、伸展和跨塌作用,最后形成拗陷盆地。原始地壳形成时是玄武质的,然而现今的大陆壳整体成分呈现中性,拆沉作用模式很好地解释了地学中的这一困惑,补充和完善了经典板块理论。通过地球物理测探、地球化学示踪和地质学、岩石学方面提供的证据和一些其它的辅助佐证基本可以判定拆沉作用的存在。
On the basis of nearly 20 years research, scholars from both Cinese and foreign admit that delamination leads to the fast sick of the lithospheric mass into the asthenosphere . The process accompanies with large mag-matism, mountains uplift, extension , collapse and formation of sag basins eventually. It is a model which was proposed to explain the dilemma that the primary mantle additions into the crust are principally basaltic, whereas the present- day continental crust has an average intermediate bulk composition. Therefore delamination is an important process for evolution of continental crust and crust - mantle interaction, it also is a complementary to the theory of Plate Tectonics. Delamination bascally can be confirmed by means of geophysical, geochemical methods, together with geological and petrological and other auxiliary evidences.
出处
《化工矿产地质》
CAS
2002年第1期17-22,共6页
Geology of Chemical Minerals
