江苏六合新生代玄武岩中地幔捕虏体的硫化物相研究

江苏六合一带碱性玄武岩中的出露有以尖晶石二辉橄榄岩为主的地幔捕虏体，这些地幔矿物中普遍有硫化物相出现：（１）被寄主矿物捕获的早期硫化物颗粒。（２）产于矿物晶粒边界或次生裂隙充填物，（３）硫化物包裹体，包括单相硫的包裹体、硫化物－玻璃两相熔体包裹体和ＣＯ／２－硫化物－玻璃（含硅酸盐子矿物）的多相包裹体，电子探针分析表明，硫化物包裹体比例隙中硫化物具有更高的相对Ｆｅ和Ｓ含量，较低的Ｎｉ含量。硫化物包裹

Sulfides in mantle xenoliths of Cenozoic basalts from Liuhe, Jiangsu province, China.

Mantle xenoliths captured in alkali basalt occurs widely in the Liuhe district, Jiangsu province, China, dominantly by spinel lherzolite. Sulfides are commonly found in minerals of the mantle xenoliths. They occur as: (1) early sulfide grains captured by host minerals; (2) intergranular or filling in the fissures; and (3) sulfide melt inclusions, including one phase sulfide inclusions, sulfide glass two phase melt inclusions, and CO 2 sulfide glass (sometimes containing silicate daughter minerals) poly phase melt inclusions. Electron microprobe analysis shows that sulfide melt inclusions have higher Fe and S contents and lower Ni content than sulfides in fissures do. The molar ratios of Ni to Fe, r Ni / r Fe , of sulfide melt inclusions range from 0.14 to 1.73, generally from 0.70 to 1.55, while those of intergranular sulfides range from 1.76 to 7.03 . Like that of Liuhe, sulfide melt inclusions in Hannuoba (Hebei province), Xinchang (Zhejiang province) and Qilin (Guangdong province) have higher Fe and S contents and lower Ni content when compared to intergranular sulfides. For both sulfide melt inclusions and intergranular sulfides, S contents increase from Liuhe, Xinchang, and Hannuoba to Qilin, Fe contents increase from Liuhe, Xinchang, Qilin, to Hannuoba; while Ni( Co) contents decrease from Liuhe, Xinchang, Qilin, to Hannuoba. It is indicated that there is a close relationship between intergranular sulfides and sulfide melt inclusions.