• 责任者：Liu Chuanzhou (State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; 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 ; 华南地区 ; South China
• 页码：p.637-651
• 图表：9 illus., 105 refs.
• 分类号：0400
• issnNo：ISSN1000-6524
• isbnNo：CN11-1966/P

     Mantle xenoliths entrained in volcanic rocks are direct samples that could provide important informa- tion on both compositions and thermal state of the sub-continental lithospheric mantle （SCLM）. Garnet lherzo- lites trapped by lamproites that were emplaced during the Early Ordovician at Dahongshan of Hubei Province dis- play abundant characteristics of both trace elements and imtopes. Their p-t estimates indicate that the SCLM has a thickness of --110 kin. Mantle xenoliths trapped by the Early Jurassic basalts in the hinterland of South China （Ningyuan and Daoxian） have fertile compositions, representing the mantle residues that were subjected to low degrees of partial melting. The whole-rock Re-Os isotopes of Ninyuan mantle xenoliths support the exis- tence of juvenile mantle in these areas during the Mesozoic, which resulted from the accretion of the astheno- sphere. Therefore, the enriched mantle that had probably existed beneath Ningyuan during the Paleozoic was completely delaminated and replaced by juvenile mantle. The mantle delamination was geodynamically related to the large-scale lithospheric extension, which occurred since --225 Ma. The Cenozoic basalts widely distributed along the coastal areas of South China contain abundant mantle xenoliths, p-t estimates based on mineral compo- sition reveal that the lithospheric mantle has a thickness of 80- 90 km, with a hot geothermal gradient. Both whole-rock and sulfide Re-Os isotopes support the existence of ancient mantle ages beneath the coastal areas of South China during the Cenozoic. Therefore, the sion in this area only triggered partial removal of the ancient lithospheric mantle. residues of Paleoproterozoic Cenozoic lithospheric extension in this area only triggered partial removal of the ancient lithospheric mantle.