CAJ | 학술논문

Paleozoic diamond- and xenolith-bearing kimberlites and Cenozoic xenolith-bearing basalts, erupted in the eastern part of the North China block (NCB), provide excellent mantle probes for the research of intra-plate processes and the Phanerozoic evolution of the subcontinental lithosphere mantle (SCLM). In this study, the mineral inclusions in diamond and xenoliths from Mengyin (Shandong Province) and Fuxian (Liaoning Province) kimberlites were chosen for constraining the nature of the Paleozoic SCLM, while xenoliths from the Shanwang and Qixia basalt (both in Shandong Province) were chosen for constraining the nature of the Cenozoic SCLM. Shanwang lies astride the Tancheng-Lujiang (Tanlu) fault zone, a major lithospheric fault in Eastern China as well as in Eastern Asia, and Qixia lies east of the fault zone. Based on the research of the petrography of mantle xenoliths, petrochemistry, major and the trace element of mantle minerals, lithospheric thermal state, combined with the modern geophysical data, it is concluded that the attenuation and replacement of Paleozoic SCLM by upwelling asthenospheric materials through thermal erosion and possibly delamination resulted in the formation of irregular-shaped hot bodies, mainly along weak zones within the mantle. The Tanlu fault zone played an important role in the Mesozoic-Cenozoic replacement of the pre-existing lithospheric mantle.