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《Geochimica》 2006-01
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Mantlederived xenoliths in Maguan Cenozoic potassic basalt, Southeast Yunnan and its bearing on lithospheric composition and dynamics

XIA Ping and XU Yi-gang(Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China)  
Maguan (southeastern Yunnan) is situated to the northwestern part of South China Sea and extends along the border between China and Vietnam. It is located geologically in the eastern side of the south section of the AilaoshanRed River fault belt, within the South China block on the west margin of the Yangtze Plate, where Cenozoic lava is extensively distributed. This paper mainly deals with the petrology, mineral chemistry, elemental and isotope geochemistry as well as the equilibrium temperature of the peridotite xenoliths in Cenozoic potassic lava in this area. The data are used to investigate the compositions of and the dynamic processes in the upper mantle in the study area. The Maguan peridotite xenoliths in the potassic lava are characterized by simple composition, and represent the remnants resulted from partial melting to various degrees of the upper mantle. Here mantle metasomatism is not remarkable and is limited to a very small number of samples. The Cpx is depleted in LREE and shows typical MORBtype SrNd isotopic signatures (87Sr/86Sr=0.702 2~0.702 9, εNd=9.5~12.3), and these characteristics are rather similar to those for oceanic lithospheric mantle. The relatively depleted peridotite (Fo 90) shows an equilibrium temperature of 928~959 ℃, which is obviously lower than that for saturated peridotite (Fo 90, 955~1 110 ℃), implying that the lithospheric mantle has a stratified structure, which is characterized by saturated composition of the lower part and enriched composition of the upper part and is related to the decompressed melting of an upwelling asthenosphere. The features suggest that the Maguan peridotites may represent the newly accreted lithospheric mantle, which have been converted from the upwelled asthenosphere with a MORBlike signature. This is consistent with the extensional dynamic setting for the study area since the late Cenozoic.
【Fund】: 中国科学院“百人计划”项目;; 国家杰出青年基金(49925308)
【CateGory Index】: P588.145;P594
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