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
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.
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%
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%
引文
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[11]Le BasM J.IUGS reclassfication of the high-Mg and picriticVolcantic rocks[J].Journal of Petrology,2000,41(10):1467-1470.
[12]云南省地质局第一区域地质调查大队.1∶20万丽江幅区域地质调查报[R].昆明:云南省地质矿产局,1977:124-131.
[13]Lightfood P C,Hawkesworth C J.Flood basalts andmagmatic N i,Cu,and PGE sulphide m ineralization:comparative geochem istry of the Noril′sk(Siberian Traps)andW estGreenland sequences[C]//Mahoney J J,CoffinM F.Large Igneous Province:Continental,Oceanic andPlanetary Flood Basalt Volcanism.W ashington D C:Amercian GeophysicalUnion,1997:357-380.
[14]张蓬勃.宾川-程海地区高镁火山岩岩石地球化学特征及含矿性[D].西安:长安大学,2003.
[15]宋谢炎,侯增谦,曹志敏,等.峨眉大火成岩省的岩石地球化学特征与时限[J].地质学报,2001,75(4):498-506.
[2]秦德先,燕永锋,林幼斌.程海断裂带玄武岩及其成矿[J].有色金属矿产与勘查,1999,8(6):373-377.
[3]王登红.关于地幔柱研究中几个问题的探讨[C]//骆耀南.峨眉山地幔柱与资源环境效应学术研讨会论文集,成都:2003:45-56
[4]张云湘,骆耀南,杨崇喜.攀西裂谷[M].北京:地质出版社,1988:1-466.
[5]朱炳泉.关于峨眉山溢流玄武岩省资源勘查的几个问题[J].中国地质,2003,30(4):406-412.
[6]张翼飞,范承钧,秦德厚.云南省区域矿产总结[R].昆明:云南省地质矿产局,1993:363-367,661-707.
[7]陈元琰.云南老厂火山岩型银铅锌铜矿床地质特征及成因[J].桂林工学院学报,1995,15(2):124-130。
[8]魏福玉.云南宁蒗-丽江-鹤庆地区成矿地质特征[J].华南地质与矿产,2000(2):43-47.
[9]Le Maitre R W,Bateman P,Dudek A.A C lassification ofigneous rocks and glossary of terms[M].Oxford:B lackwell,1989:50-52.
[10]Irvine T N,Baragar W V A.A guide to the chem icalclassification of the common volcanis rocks[J].Can.J.Earth Sci.1971(8):523-548.
[11]Le BasM J.IUGS reclassfication of the high-Mg and picriticVolcantic rocks[J].Journal of Petrology,2000,41(10):1467-1470.
[12]云南省地质局第一区域地质调查大队.1∶20万丽江幅区域地质调查报[R].昆明:云南省地质矿产局,1977:124-131.
[13]Lightfood P C,Hawkesworth C J.Flood basalts andmagmatic N i,Cu,and PGE sulphide m ineralization:comparative geochem istry of the Noril′sk(Siberian Traps)andW estGreenland sequences[C]//Mahoney J J,CoffinM F.Large Igneous Province:Continental,Oceanic andPlanetary Flood Basalt Volcanism.W ashington D C:Amercian GeophysicalUnion,1997:357-380.
[14]张蓬勃.宾川-程海地区高镁火山岩岩石地球化学特征及含矿性[D].西安:长安大学,2003.
[15]宋谢炎,侯增谦,曹志敏,等.峨眉大火成岩省的岩石地球化学特征与时限[J].地质学报,2001,75(4):498-506.
目录