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《Journal of Changchun University of Science and Technology》 2002-04
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NATURE OF LATE MESOZOIC LITHOSPHERIC MANTLE IN WESTERN LIAONING PROVINCE:EVIDENCES FROM BASALT AND THE MANTLE-DERIVED XENOLITHS

WANG Dong yan 1, XU Wen liang 1, FENG Hong 2, LIN Jing qian 1, ZHENG Chang qing 1 (1.College of Earth Sciences, Jilin University, Changchun 130061,China;2.Northeast Survey and Design Institute, Changchun 130062)  
The petrological, mineralogical and geochemical data of the mantle-derived xenoliths in Mesozoic basalts from western Liaoning province indicate that late Mesozoic lithospheric mantle is composed of older enriched and new accreted lithospheric mantle. The former is representive of amphibole-spinel-lherzolite, which is involved in Na rich mantle metasomatism. The peridotite xenoliths are rich in LREE and have higher w ( 87 Sr)/ w ( 86 Sr) ratios; The latter is representive of pyroxenite, which displays the accumulate texture and has higher REE abundance than the Sp-lherzolite from the region. The pyroxenite is similar tothe mantle-derived pyroxenitexenoliths in Cenozoic basalts from eastern China in mineral composition and REE abundance, which implies that they could be an earlier magmaticaccumulate in the upper mantle.
【Fund】: 高校博士学科点基金资助项目 (2 0 0 10 1830 0 7)
【CateGory Index】: P59
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