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黄金科学技术 ›› 2022, Vol. 30 ›› Issue (1): 34-45.doi: 10.11872/j.issn.1005-2518.2022.01.047

• 矿产勘查与资源评价 • 上一篇    下一篇

内蒙古毕力赫金矿Ⅱ号矿带原生晕特征及找矿意义

万卫1(),汪明启2,范会虎3,左立波4,杨科科2   

  1. 1.东华理工大学核资源与环境国家重点实验室,江西 南昌 300013
    2.中国地质大学(北京)地球科学与资源学院,北京 100083
    3.中国地质科学院,北京 100037
    4.中国地质调查局天津地质调查中心,天津 300170
  • 收稿日期:2021-04-13 修回日期:2021-09-30 出版日期:2022-02-28 发布日期:2022-04-25
  • 作者简介:万卫(1989-),男,江西南昌人,博士研究生,从事勘查地球化学研究工作。631178404@qq.com
  • 基金资助:
    中国地质调查局地质调查项目“内蒙古毕力赫金矿原生晕研究”(D21404502);东华理工大学博士科研启动基金“地球化学测量方法在覆盖区找矿的试验性研究”(DHBK2017107)

Primary Halo Characteristics of No.2 Ore Belt in Bilihe Gold Deposit,Inner Mongolia and Its Prospecting Significance

Wei WAN1(),Mingqi WANG2,Huihu FAN3,Libo ZUO4,Keke YANG2   

  1. 1.State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 300013, Jiangxi, China
    2.School of Earth Sciences and Resources, China University of Geoscience(Beijing), Beijing 100083, China
    3.Chinese Academy of Geological Sciences, Beijing 100037, China
    4.Tianjin Geological Survey Center, China Geological Survey, Tianjin 300170, China
  • Received:2021-04-13 Revised:2021-09-30 Online:2022-02-28 Published:2022-04-25

摘要:

毕力赫金矿位于华北克拉通北缘,是一座大型低温热液—斑岩型金矿,产于花岗闪长斑岩和围岩火山碎屑岩内外接触带中。随着矿山开采工作的持续进行,该矿山资源量面临危机,加强探边摸底工作势在必行。为了寻找有效的地球化学找矿指标,采用无火焰原子吸收光谱法(AAN)、等离子质谱法(ICP-MS)和原子荧光光谱法(AFS)等多种分析方法,对毕力赫矿区Ⅱ号矿带3个钻孔原生晕元素特征进行了研究。结果表明:毕力赫金矿化的主要指示元素组合为Au、W、Mo、As、Sb和Hg;矿区内出现2组金矿成矿指示元素组合,分别是Au-W-Mo高温元素组合和Au-As-Sb-Hg低温元素组合。其中,Au-W-Mo元素组合指示高品位金矿化,可作为区内寻找高温斑岩型金矿的主要找矿指标;Au-As-Sb-Hg元素组合指示低品位金矿化,可作为区内寻找脉状低温热液型金矿的主要找矿指标。利用原生晕找矿方法进行深部成矿预测和评价,发现了微弱的金矿化活动信息,可为研究区金矿找矿工作提供更准确的地球化学找矿指标,具有重要的实际意义。

关键词: 毕力赫金矿, Ⅱ号矿带, 原生晕找矿方法, 元素特征, 深部找矿, 内蒙古

Abstract:

Bilihe gold deposit is a large low-temperature hydrothermal and porphyry gold metallogenic system in the northern margin of North China Craton,which is hosted in internal and external contact zone of granodiorite and surrounding pyroclastic rock.The mining area has appeared a sharp drop of resource reserves due to continuous mining work.In order to ensure the sustainable development of the mine and improve the utilization rate of gold ore resources,there has arisen a critical necessity to strengthen geochemical exploration of deepand peripheral resources in the mining area.The primary halo prospecting method directly takes rocks or ores as the research target,which is considered to be the most direct and effective deep prospecting method at present and has achieved good results in the exploration of gold deposits.This paper take the mining No.2 ore belt as the research taget and analyze various elements such as Au,Ag,Cu,Pb,W,Mo,Bi,As,Sb,Hg of the primary halo of boreholes.The characteristics of element content,element association and spatial distribution of primary halo in three boreholes of No.2 ore belt in Bilihe mining area have been studied to find effective geochemical prospecting indicators.The results show that the main indicator elements of gold mineralization in Bilihe mining area are Au,W,Mo,As,Sb and Hg.There are two groups of gold metallogenic indicator element associations in Bilihe mining area,namely,Au-W-Mo high-temperature element association and Au-As-Sb-Hg low-temperature element association.Au-W-Mo element association indicates high-grade gold mineralization,strong gold mineralization activity and large metallogenic scale,which can be used as the main prospecting indicator for high-temperature porphyry gold deposits in the mining area.Au-As-Sb-Hg element association indicate low-grade gold mineralization,relatively weak gold mineralization activity and limited metallogenic scale,which can be used as the main prospecting indicator for vein-type low-temperature hydrothermal gold deposits in the mining area.Weak gold mineralization information can be obtained by applying 10×10-9 gold content as the lower limit of primary halo anomaly of gold deposits.The distribution range of gold mineralization can be accurately determined by applying 100×10-9 gold content as the inner zone of primary halo anomaly of gold deposits.The inner anomaly range of primary halo delineated by this method is much larger than the distribution range of gold orebodies.Therefore,Using primary halo prospecting method for deep prediction and evaluation can effectively enlarge weak information of gold mineralization.

Key words: Bilihe gold deposit, No.2 ore belt, primary halo prospecting method, element characteristics, deep prospecting, Inner Mongolia

中图分类号: 

  • P618.51

图1

毕力赫金矿地质图(a)(据张赋等,2012修改)和大地构造位置图(b)(据葛良胜等,2009修改)1.第四纪;2.第三纪;3.白音高老组火山岩系;4.玛尼图组火山岩系;5.额里图组沉积碎屑岩系;6.二长花岗斑岩;7.矿脉;8.勘探线;9.地质界线;10.矿化石英脉;11.断裂带;12.研究区位置;13.钻孔位置及编号"

图2

毕力赫金矿Ⅱ号矿带0号勘探线剖面图(据唐明国等,2010修改)1.第四纪;2.第三纪;3.玛尼图组火山岩系;4.花岗闪长斑岩;5.二长花岗斑岩;6.岩性界线;7.钻孔;8.矿体(金品位>0.5×10-6);9.矿体(金品位>10×10-6)"

表1

毕力赫金矿区Ⅱ号矿带钻孔原生晕元素含量特征"

钻孔参数AuAgCuPbAsSbHgWMoBiNi
ZK007平均值4 415.1129.6165.528.275.811.8862.899.623.90.329.5
中位数2 293.097.4110.026.925.33.431.044.715.30.230.1
标准差6 133.6102.7150.46.8161.632.65 005.3122.923.10.38.2
变异系数1.40.80.90.22.12.85.81.21.01.20.3
ZK5101平均值18.479.453.820.584.72.828.22.62.70.2120.3
中位数4.674.351.118.331.12.511.82.11.90.2101.5
标准差35.429.428.210.4177.12.860.82.73.10.293.5
变异系数1.90.40.50.52.11.02.21.01.20.80.8
ZK8001平均值12.7100.117.433.6165.712.686.63.51.60.413.4
中位数6.084.712.422.290.59.99.01.31.20.24.5
标准差13.760.918.142.0197.912.2379.07.01.81.215.9
变异系数1.10.61.01.21.21.04.42.01.12.91.2

表2

毕力赫金矿区Ⅱ号矿带钻孔原生晕因子分析结果"

钻孔F1F2F3F4F5
ZK007Au、W、Mo元素组合Ag、Bi、Cu元素组合Hg、Sb元素组合As、Pb元素组合Ni元素
ZK5101Au、Sb、Ag、Hg元素组合Hg、As、Bi元素组合Cu、Ni元素组合Mo、Au元素组合W元素
ZK8001Pb、Ag、Cu元素组合W、Ni、Cu元素组合Hg、Sb元素组合Bi、As元素组合Au元素

图3

ZK007钻孔元素含量空间分布图"

图4

ZK5101钻孔元素含量空间分布图"

图5

ZK8001钻孔元素含量空间分布图"

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