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分析了北羌塘半岛湖新第三纪玻基粗面安山岩中黑云母的常量、微量及稀土元素特征.结果表明,黑云母均属钛铁黑云母类,富集大离子亲石元素Ba以及Sc,Ti,V,Cr,Co,Ni等铁族元素,而相对亏损Th,U,Pb等亲石元素.轻稀土强烈富集,轻重稀土分异显著,但Eu亏损并不严重,暗示原始岩浆来源于一个基性岩质的、相当于榴辉岩矿物相(斜长石相缺失)的源区类型.
The characteristics of trace elements, trace elements and rare earth elements of biotite in the Neogene Epoch of the Neogene in the North Tertiary, North Qiangtang were analyzed. The results show that the biotite belongs to biotite, Sc, Ti, V, Cr, Co, Ni and other iron group elements, while relative loss of Th, U, Pb and other lithophile elements.Light rare earths are strongly enriched, light and heavy rare earth differences significantly, but the Eu loss is not serious, suggesting that primitive Magma is derived from a basic rock type that corresponds to the source zone type of eclogite mineral facies (plagioclase phase loss).