中子活化分析法对洪古勒楞蛇绿岩中变质橄榄岩的地球化学研究

An INAA analysis for metaperidotite from Hongguleleng ophiolite

用预富集中子活化分析法测定了新疆洪古勒楞蛇绿岩中的稀土元素(REE),用仪器中子活化法测定了微量元素。依据测定结果分析了微量的稀土元素和过渡金属元素及不相容元素地球化学特征。认为二辉橄榄岩X-49 可能代表原始地幔的化学成分, 方辉橄榄岩 X-44 可能为上地幔部分熔融后残留的地幔物质, 纯橄榄岩X-55、X-57 可能为镁铁质熔融体在上地幔内以堆晶作用形成的超镁铁质岩类。

A preconcentration INAA method is used for the analysis of very low REE concentrations of the Hongguleleng ophiolite and the normal INAA method for the trace elements of the ophiolites. The analyses show that the lherzolite (sample X-49) may be representative of primary mantle, while the harzburgite (sample X-44) is probably the residual mantle material from partial melting of the upper mantle, and the dunite (samples X-55 and X-57) may be accumulated from mafic magma.