• 责任者：Guo Feng (State Key Laboratory of Isotope Geochemistry ; Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China)
• 刊名：Acta Petrologica et Mineralogica
• 出版年：2013
• 卷期：32(5)
• 关键词：岩石圈地幔 ; lithospheric mantle ; 氧同位素 ; oxygen isotopes ; 华北地台 ; North China Platform
• 页码：p.593-603
• 图表：4 illus., 64 refs.
• 分类号：0400
• issnNo：ISSN1000-6524
• isbnNo：CN11-1966/P

     Oxygen isotopic records from olivine crystals in Mesozoic mafic rocks and xenoliths in Shandong Province indicate an important contribution of both subducted continental crust and oceanic crust to the modifica- tion of the lithospheric mantle beneath the North China Craton （NCC）. The early Cretaceous lithospheric man- tle that has higher 3180 （6.0‰- 7.2‰） than normal mantle was mainly metasomatized by melts/fluids derived from the subducted Yangtze crustal rocks, which included the lower mafic and upper felsic components with sub- ordinate marine carbonates. In contrast, some low-MgO peridotite xenoliths in the late Cretaceous lithospheric mantle that has lower 3180 （4.1‰--5.3‰） than normal mantle were ascribed to the modification of subducted oceanic crust that had been hydrothermally altered prior to the subduction. The incorporation of recycling crustal rocks into the lithospheric mantle through plate subduction was an important mechanism for the modification and destruction of the lithospheric mantle beneath the NCC, e.g. , the introduction of the fertile continental crustal components led to the refertilization of the lithospheric mantle that made it more fusible in response to thermal perturbation. The large-scale early Cretaceous mafic magmatism in NCC resulted probably from the breakoff or detachment of the entire subducted continental slab. The subduction of the paleo-Pacific Ocean since late Me~zoic has exerted a significant impact on the mantle replacement and accretion, resulting in the coexistence of ＂old＂ and ＂newly aeereted＂ mantle domain beneath the NCC.