因子分析在藏北商旭金矿床地球化学勘查中的应用

 (1．中国地质调查局成都地质调查中心，四川成都610081;2．河南省地质调查院，河南郑州450007;3．西藏自治区地质矿产勘查开发局第五地质大队，青海格尔木816000)

    提要：西藏双湖县商旭金矿床位于班公湖一怒江成矿带中部，矿体受NWW向断裂构造控制，呈脉状、透镜状产出，赋矿围岩为木噶岗日群炭质板岩及变质砂岩，矿石矿物为自然金，矿石类型主要为石英脉型与绢英岩型，为一典型的造山型金矿床。在对矿床地质特征、成矿条件分析的基础上，利用矿区岩屑地球化学数据，运用因子分析等多元统计方法，研究矿区地球化学元素组合，共划分出Cu-Pb-Zn元素组合分区、Au-Ag元素组合分区、As-Sb元素组合分区以及W-Mo-Bi元素组合分区等4个地球化学分区，绘制了因子得分等值线图，并在此基础上探讨找矿方向。

    结合矿区地质特征认为，Au.Ag元素组合和As 、Sb组合为商旭金矿床的最佳地球化学标志元素，下一步地质工作重点应放在Ⅱ₁号、Ⅲ₁号矿体深部及周围，同时可布置适当的工程在Ⅲ号矿段西部A预测区，以追索Ⅲl系列矿体向西的延伸。

    关  键 词：西藏；班公湖一怒江；商旭；因子分析；找矿方向

    中图分类号：P624；P618.51  文献标志码：A  文章编号：1000-3657(2015)04-1126-11

  Factor analysis in geochemical survey of the Shangxu gold deposit, northern TibetLIU Hong', HUANG Han-xiao', LI Guang-ming', XIAO Wan-feng2,

    ZHANG 2hi_lin3, LIU Bo', MA Dong-fang', DONG Lei', MA Dongl

  (1.Chengdu Cente,: China Geological Survey, Chengdu 610081, Sichuan, China;2. Henan Institute of Geological Survey, Zhengzhou

    450007, Henan, China;3,No.5 Geological Party of Tibet Geological Exploration Bureau, Golmud 816000, Qinghai, China)

  Abstract: The Shangxu gold deposit, an orogenic gold deposit in the middle part of Bangong Co-Nujiang metallogenic polymetallicbelt, is located in Shuanghu County of Tibet. Orebodies occur as veins and lens controlled by the NEE fractures, and the host rocksare carbonaceous slate and metasandstone belonging to the Mugagangri Group; quartz vein type ore and altered rock type orecoexist, with distinctive alteration. Based on an analysis of previous research results of geological features and metallogenicconditions, the authors analyzed the debris samples in the Shangxu gold ore district by using factor analysis method, and drew ageochemical subdivision map and a factor score map. Four geochemical subdivisions were recognized, i.e., Cu-Pb-Zn subdivision,Au-Ag subdivision, As-Sb subdivision, and W-Mo-Bi subdivision. Combined with field geological work, the authors hold that Au-Ag, and As-Sb are the optimum element combinations for prospecting prediction. In future work, orebody  III and  orebody III l,aswell as their surroundings should be regarded as the preferred exploration areas. Meanwhile, predicting area A located in the north ofNo.Ⅲore section is also recommended with the purpose of findingⅢl type orebodies which extend westward.

Key words: Tibet; Bangong Co-Nujiang; Shangxu; factor analysis; prospecting potentialAbout the first author: LIU Hong, male, born in 1987, assistant engineer, majors in mineral deposits and mineral exploration, E-mail: cugliu@foxmail.com.

About the corresponding author: LI Guang-ming, male, born in 1965, senior researcher, engages in the study of mineral depositsand mineral exploration; E-mail:cdguangming@cgs.gov.cn.

结论

    (1)综合研究表明，商旭金矿床的最佳地球化学标志元素组合为：1Au、Ag，②As、Sb，其中，As、Sb元素组合为金矿体的前缘晕，Au、Ag元素组合为金矿体的近矿晕，F2、F3分区是工作区内金成矿的有利地质体。

    (2)下一步地质工作重点应放在Ⅱ号矿段、Ⅲ号矿段南部Ⅱ．号、Ⅲ，号矿体及周围。

    (3)可布置适当的工程在Ⅲ号矿段西部A预测区范围以分别追索Ⅲ．系列矿体向西的延伸部分。

    致谢：本文撰写过程中得到中国地质大学（武汉）赵少卿、刘月高和胡庆成博士，中国地质调查局成都地质调查中心和西藏自治区地质矿产勘查开发局第五地质大队多位专家的帮助和指导，审稿专家及责任编辑杨艳老师对论文提出了宝贵修改意见，在此表示衷心感谢！

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