云南宾川-丽江地区二叠纪镁铁-超镁铁岩及其成矿问题探讨  

Mafic-ultramafic rocks in permian period and minerogenitic potentialities

作　　者：朱士飞[1] 钱壮志[2] 姜常义[2] 秦勇[1] 高艳青[3] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221008 [2]长安大学地球科学与国土资源学院,西安710054 [3]徐州空军学院机场工程系,江苏徐州221000

出　　处：《桂林工学院学报》2006年第4期456-462,共7页Journal of Guilin University of Technology

基　　金：云南省自然科学基金资助项目(2003D0016Z);中国地质调查局地质大调查综合研究项目(200110200058)

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．据镁质含最可划分为高镁系列（MgO〉12％），低镁系列（MgO≤12％）；低镁系列又可归为过渡系列（MgO8％-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Ni、Cu、PGE资源的成矿潜力．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-uhramafic intrusions. By applying modern theory of petrology formation, systemically some characteristics of Emeishan basalts＇ petro-geocbemistry 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 nickelcopper sulfide deposits in Binchuan and Lijiang County is estimated and further assignment can be carded through in order to expand perspective targets.

关 键 词：大陆溢流玄武岩 岩石地球化学 成矿潜力 宾川-丽江 云南 

分 类 号：P581[天文地球—岩石学] P588.145[天文地球—地质学]