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云南省地质局实验室西盟锡矿专题组最近对西盟地区含矿变质岩系作了初步的岩石学研究。初步资料表明,这里的含矿岩系为一套前寒武纪的变质地层。西盟含矿岩系的变质地层经受了高绿片岩相的区域变质作用和混合岩化作用。至今未获化石。主要是以渗透交代为主的眼球条痕状碱长混合岩类,蠕虫结构等少见。据混合岩中眼球状钾长石的2V(46.5°—82.5°)计算的三斜度与X光衍射测定的三斜度〔△=1.25(d131-d131)〕的结果是一致的。据此,可大致划分
The Ximeng Tin Project Group of the Yunnan Bureau of Geology Laboratory conducted a preliminary petrological study of ore-bearing metamorphic rocks in the Western League. Preliminary data indicate that the ore-bearing rocks here are a set of Precambrian metamorphic formations. The metamorphic strata of the Ximeng ore-bearing series have undergone regional metamorphism and mixed-lithification of high-greenschist facies. So far no fossils. Mainly based on the infiltration account of the eye streak-like alkalescence mixed rock, worm structure rare. The three slopes calculated from the 2V (46.5 ° -82.5 °) of the ocular kappa-feldspar in the mixed rocks are consistent with the results of the three slopes (Δ = 1.25 (d131-d131)] measured by X-ray diffraction. According to this, it can be roughly divided