【摘要】 在峨眉山大火成岩省中,宾川-丽江地区的溢流玄武岩厚度最大,发育较为完整,并有相伴的镁铁-超镁铁侵入岩发育.运用现代岩石成因理论初步分析了该区二叠纪火山岩的岩石学和地球化学特征,并同国内外铜镍铂钯岩浆硫化物矿床产出的地质背景和成矿条件作了比较.研究区二叠纪玄武岩以亚碱性玄武岩序列为主,碱性玄武岩系列次之.据镁质含量可划分为高镁系列(MgO>12%),低镁系列(MgO≤12%);低镁系列又可归为过渡系列(MgO 8%~12%)和低镁系列(MgO≤8%)两个亚系列.研究区及邻区已发现的成矿事实显示,该区二叠纪镁铁-超镁铁岩浆活动具有N i、Cu、PGE资源的成矿潜力.更多还原

【Abstract】 In Emeishan basalts,one of the large igneous province,the basalts of Binchuan and Lijiang County have thickest and a series of rocks,with mafic-ultramafic intrusions.By applying modern theory of petrology formation,systemically some characteristics of Emeishan basalts′ petro-geochemistry and magma activation are described.On the basis of research,the problem whether the deposits can be formed in Binchuan and Lijiang County is discussed,compared with the geological setting and viscosity of the Norils′ k deposits.Through a comprehensive study and comparative analysis of existing datum,some conclusions can be drawn as follow:(1) CFB occurring in this region can be compositionally subdivided into three types: the high-Mg(MgO>12%),transitional-Mg(8%<MgO≤12%) and low-Mg groups(MgO≤8%).(2) Compared with the metallogenic realities,settings and viscosities at home and abroad,especially with Noril’sk region,the perspective of nickel-copper sulfide deposits in Binchuan and Lijiang County is estimated and further assignment can be carried through in order to expand perspective targets.更多还原