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《Earth Science Frontiers》 2003-03
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THE CHEMICAL COMPOSITION CHARACTERISTICS OF CLINOPYROXENES FROM SPINEL-LHERZOLITE XENOLITHS IN MAGUAN AREA, EASTERN TIBET AND ITS SIGNIFICANCE

WEI Qi-rong~(1,2),WANG Jiang-hai~2,XIE Guang-hong~2(1. Faculty of Material Science & Chemistry Engineering, China University of Geosciences,Wuhan 430074, China;2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China)  
The mineral assemblages of spinel-lherzolite xenoliths in Maguan Area, Eastern Tibet are Ol+Opx+Cpx+Spl. The Cpxs belong to diopside, characterized by high Ca (w(CaO)=18.71%~(20.78%),) Al (w(Al_2O_3)=6.00%~7.30%), and Mg~# value (89.84~91.48), while low Cr~# value ((5.18)~8.72). The contents of SiO_2, TiO_2, FeO~* and Na_2O range from 51.71% to 52.50%, 0.34% to (0.61%,) 2.50% to 3.14%, and 1.46% to 1.80%, respectively. The chemical composition characteristics of Cpxs indicate that the spinel-lherzolite xenoliths belong to the type-A peridotite enclaves and the lower melted continental mantle. The analog computation of Y(18.60~20.90 μg/g) and Yb(1.97~(2.18 μg/g)) values from diopside revealed that the spinel-lherzolite xenoliths were derived from the remnant of a primary mantle after 3% partial melting.
【Fund】: 国家重点基础研究发展规划项目 (G19980 40 80 7) ;; 国家自然科学基金资助项目 (4 9972 0 2 6) ;; 中国科学院知识创新项目(KZCX2 SW 117) ;; 中国博士后科学基金资助项目
【CateGory Index】: P578
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