| 张勇,李泽峰,刘国燕,林贵,朱传宝.东昆仑喀雅克登中泥盆世二辉橄榄岩的发现及找矿意义[J].矿产勘查,2015,6(4):405-412 |
| 东昆仑喀雅克登中泥盆世二辉橄榄岩的发现及找矿意义 |
| Discovery of Middle Devonian lherzolite and its prospecting significance in Kayakedeng, East Kunlun Mountain |
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| DOI： |
| 中文关键词: 二辉橄榄岩 杂岩体 岩石化学特征 喀雅克登 |
| 英文关键词: lherzolite, ultrabasic complex, geochemical characteristics, Kayakedeng |
| 基金项目:中国地质调查局矿产调查评价项目(编号:1212011221047)资助。 |
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| 中文摘要: |
| 喀雅克登东部的基性—超基性杂岩体,在区域地质调查中一直被认为是早—中泥盆世辉长岩,本次工作利用岩矿鉴定、岩石化学成分分析,结合野外实际工作情况,分析认为该岩体为二辉橄榄岩与辉长岩的杂岩体,且以二辉橄榄岩为主体。二辉橄榄岩m/f比值为3.55～4.00,为铁质超基性岩,具拉斑玄武岩特征,辉长岩m/f比值为0.79～1.27,为铁质基性岩,为钙碱性系列,两者均为加里东造山带造山后伸展环境下的产物。喀雅克登基性—超基性杂岩体与夏日哈木超大型铜镍矿床含矿杂岩体对比发现,两者岩性、地球化学特征、形成时代、构造环境均较为相似,表明在喀雅克登杂岩体中有寻找大型铜镍矿床的前景。 |
| 英文摘要: |
| The basic-ultrabasic complex in the eastern Kayakedeng, has been mapped as the early-middle Devonian gabbro in the regional geological survey. Based on the study result of the mineral identification, petrochemical components analysis and the field observation, the previous mapped basic-ultrabasic complex is lherzolite and gabbro complex dominated with lherzolite. The m/f ratio of lherzolite is 3.55～4.00, which indicates that the complex is iron-ultramafic body with characteristics of tholeiite. The m/f ratio of gabbro is 0.79～1.27 which indicates the complex is ferruginous basic rock with Ca-alklic series. Both are the product of extensional environment after the era of the Caledonian orogen. The comparison of the Kayakedeng basic-ultrabasic complex and the ore-bearing complex of Xiarihamu deposit, a super large-sized Cu-Ni deposit, shows that both complex have similar features in lithology, geochemical characteristics, formation age and tectonic setting, indicates that there is great prospect of exploring the large-sized Cu-Ni deposit in Kayakedeng basic-ultrabasic complex. |
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