郑建平, 路凤香, 余淳梅, 等. 华北克拉通破坏的物理

This paper has compared the subcontinental lithospheric mantle (SCLM) properties reflected by xenolith and terrane peridotites occurred in different times and locations in the eastern part of the North China Craton, and discussed the physical and chemical processes of the destruction of the North China Craton. The the lithospheric delamination is hard to interpret the coexistence of the SCLM with refractory, transitional and fertile affinity beneath the same area. Pure peridotite-melt interaction is also difficult to interpret the thinning of the Mesozoic and Cenozoic lithospheric mantle and the LREE depletion of clinopyroxene in Cenozoic lithospheric mantle, which means the transitions of the cratonic mantle (with complicated evolution history) to the occanic lithosphere (with simple evolution history). The destruction of the eastern North China Craton includes various complicated physical and chemical processes of mantle extension, melt-rock interaction, metasomatism and replacement. The earlier large scale lithosphere thinning and the later small scale lithosphere thickening resulted in the mantle replacement and the total lithosphere thinning of the North China Craton lithosphere. The fertile peridotite xenoliths trapped in the 100 Ma Fuxian basalts indicate that the early mantle replacement beneath the eastern North China Craton occurred locally before 100 Ma.