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Study on Sulfide-melt Inclusions in Mantle Xenoliths of xinchang, Zhejiang

International Journal of Minerals,Metallurgy and Materials 2000年第1期14卷 5-9页

作者： Jiuhua Xu Xuelei Chu YulingXie Fenglei Bie Dayi Qian University of Science and Technology Beijing, Beijing 100083, China China University of Geosciences, Beijing 100083, China The Research Center of Mineral Resources Exploration, Chinese Academy University of Science and Technology Beijing Beijing 100083 China Research Center of Mineral Resources Exploration Chinese Academy of Sciences Beijing 100101 China Institute of Geology Chinese Academy of Sciences Beijing 100029 China China University of Geosciences Beijing 100083 China

In minerals of mantle xenoliths captured within Tertiary alkali-basalt from xinchang, Zhejiang province, China, many sulfidemelt inclusions were found by the observation of polished thin section. electron microprobe analysis has been applied to detect the components of sulfide-melt inclusions. The result shows that the sulfide phases of inclusions are mainly pentlandite, and secondarily pyrrho- tite, The molar ratio of Ni to Fe, r_Ni,/r_Fe, of mineral phases in sulfide inclusions is related to olivine contents in host mantle xenoliths. The r_Ni/r_Ni, of sulfides from xinchang samples has a possitive correlation to r_(Fe+Ni),/r_S. The r_(Fe+Ni),/r_S, becomes higher with the increasing of r_Ni/r_Fe In single sulfide-melt inclusions, r_Ni,/r_Fe, r_(Fe+Ni),/r, and Ni contents increase from the center to edge, reflecting a result of different cooling speed in an inclusion. A comparison between the data from Hannuoba, West Eifel of Germany and Nograd-Gomor of east Europe suggests that the composition of the inclusions is different for each area, which indicated that a regional differentiation of sulfide in mantle fluids.

关键词： mantle xenolith sulfide-melt inclusion electron microprobe analysis, xinchang

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