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黄金科学技术 ›› 2022, Vol. 30 ›› Issue (4): 518-531.doi: 10.11872/j.issn.1005-2518.2022.04.064

• 矿产勘查与资源评价 • 上一篇    

玲珑金矿田含矿断裂的基岩地球化学特征及找矿潜力评价

胡宝群1(),高海东2,王运1,张宝林3,吕古贤4,申玉科4,郭涛4   

  1. 1.东华理工大学地球科学学院,江西 南昌 330013
    2.山西工学院能源学院,山西 朔州 036000
    3.中国科学院地质与地球物理研究所,中国科学院矿产资源研究重点实验室,北京 100029
    4.中国地质科学院地质力学研究所,北京 100081
  • 收稿日期:2021-05-24 修回日期:2021-11-01 出版日期:2022-08-31 发布日期:2022-10-31
  • 作者简介:胡宝群(1965-),男,江西进贤人,博士,教授,博士生导师,从事岩矿地球化学研究工作。bqhu@ecut.edu.cn
  • 基金资助:
    中国地质调查局地质矿产调查评价项目“胶东招平断裂带中段构造解析与靶区验证”(12120113096300)

Bedrock Geochemical Characteristics and Prospecting Potential Evaluation of Ore-Bearing Faults in Linglong Gold Ore-field

Baoqun HU1(),Haidong GAO2,Yun WANG1,Baolin ZHANG3,Guxian LV4,Yuke SHEN4,Tao GUO4   

  1. 1.School of Earth Sciences, East China University of Technology, Nanchang 330013, Jiangxi, China
    2.College of Energy Industry, Shanxi College of Technology, Shuozhou 036000, Shanxi, China
    3.Key Laboratory of Mineral Resources, Chinese Academy of Sciences, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    4.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
  • Received:2021-05-24 Revised:2021-11-01 Online:2022-08-31 Published:2022-10-31

摘要:

基岩地球化学方法广泛应用于地质找矿与生产实践,是开展深部找矿预测最直接的方法和手段。通过对玲珑金矿田井下含矿断裂和招平断裂的基岩剖面地球化学特征进行系统研究,得出以下认识:玲珑金矿田原生晕最佳指示元素组合为Au、Ag、Bi、As和Co,且Au-Ag、Au-Bi、Au-As及Au-Co元素之间呈较好的幂指数正相关。根据玲珑金矿田已探明矿脉最佳指示元素组合的统计结果,结合招平断裂基岩剖面地球化学测量结果,发现招平断裂在地表有2处金矿化异常,推测其为矿致异常,反映出该地段具有较好的找矿潜力,特别是前花园村东1021剖面中异常找矿潜力更大。

关键词: 指示元素组合, 基岩地球化学, 矿化异常, 找矿评价, 招平断裂, 玲珑金矿田, 胶东

Abstract:

The mineralization of Linglong gold ore-field is controlled by faults.In the process of gold mineralization,the fault is not only the channel of mineralization fluid,but also the surrounding rocks in direct contact with mineralization fluid.The fluid and wall rocks on both sides of the fault must have metasomatic reactions.Therefore,it is of great significance to study the geochemical characteristics of bedrock in fault profile for metallogenic research and prospecting prediction.Based on the study of geochemical characteristics of bedrock profiles of ore-bearing faults and Zhaoping fault in Linglong gold field,taking ascertain orebody as research template,a comprehensive study of the correlation between Au and other trace elements in orebody-wall rock,lean-rich ore,local-whole was conducted.Combined with mineralogical characteristics and geo-chemical characteristics of element halo of gold deposit,application research on metallogenic prediction of unknown orebodies was performed.Regarding 7 orebodies profile as the research object,by comparing the correlation between Au and trace elements in orebody and surrounding rock,the variation characteristics and correlation of trace elements in orebody profile in local range were analyzed,and the best indicator elements of Au in typical orebodies in the ore field were summarized.According to the gold grade,352 orebodies can be divided into five types (super rich ore,rich ore,lean ore,super lean ore,surrounding rock).The average content of trace elements in various orebodies was counted, and the difference in the indication meaning of trace elements in rich and poor ores was compared.On the premise of a large number of sample data statistics, the correlation between Au and other trace elements in the Linglong ore field was summarized through scatter plots. Combined with the occurrence form of gold and various trace elements, the geological significance of Au and various trace elements, and the diagenesis and mineralization mechanism of Linglong gold ore field were discussed.The above research results were applied to other faults in Linglong gold field,and the primary halo geochemical halo method was used to predict fault mineralization.The following understandings are obtained:The best indicator element combination of primary halo in Linglong gold field is Au,Ag,Bi,As and Co,and the positive correlation of power exponent among Au with Ag,Bi,As and Co elements is good.Gold exists in the form of silver gold ore,mainly in the form of fine grains or veins in the fissures and crystal gaps of pyrite.The geochemical survey of bedrock profile of Zhaoping fault shows two gold mineralization anomalies,which are supposed to be ore-induced anomalies and have good prospecting potential,especially in the 1021 profile of east Qianhuayuancun.Based on the geochemical survey method of bedrock in fault profile,the prospecting object is expanded by changing prospecting into halo,and the deep metallogenic prospect can be predicted according to the difference of halo forming element distribution.

Key words: indicator elements combination, bedrock geochemical, mineralization anomalies, prospecting and evaluation, Zhaoping fault, Linglong gold field, Jiaodong

中图分类号: 

  • P618.51

图1

玲珑金矿田地质简图及大开头矿区89线地质剖面图(据高海东等,2013修编)"

表1

典型矿体剖面成分变化"

采样位置样号岩性点距/mAuAgAsBiCoCuHgMnMoNiPbSbThUVZn

剖面1:

-570 m

175支2

的84川

LL008弱钾化花岗岩00.0340.020.20.0314<0.0051040.33<119<0.056.30.25414
LL009红色强钾化花岗岩5.00.1490.130.10.0821<0.005770.34<117<0.057.10.4238
LL010灰绿色蚀变岩(原岩花岗岩)1.50.7140.181.30.33312<0.0053830.26180.076.61.183524
LL011石英硫化物矿石(矿体)1.552.20016.2083.432.0038150.049451.7216160.334.01.67174
LL012石英硫化物矿石(矿体)1.540.50012.3541.317.7017730.010681.361450.112.70.7654
LL013富硫化物中等硅化花岗质碎裂岩(矿体)1.563.30020.9064.326.1028430.014531.3218100.235.01.11225
LL014中等硅化花岗岩2.00.2960.232.00.32414<0.0051641.511380.063.40.16421

剖面2:

-620 m

175支2

的74川

LL021强钾化花岗岩00.0140.020.40.0216<0.0051330.49220<0.054.90.20428
LL022基性岩脉2.00.0880.030.10.18143<0.0056031.1940120.052.10.657971
LL023中等硅化弱钾化花岗岩3.00.2160.050.90.1812<0.005860.411200.051.50.12416
LL024硅化硫化物(矿体)1.548.3006.0640.627.80196110.008771.2217220.582.40.1759
LL025弱钾化强硅化花岗岩2.00.0820.020.20.1412<0.0051840.452130.051.20.23311
LL026中等硅化花岗岩4.00.0750.650.91.53340.0662070.471830.071.50.36310

剖面3:

-670 m

175支2

的88川

LL036中等钾化花岗岩00.0610.050.70.1162<0.0051310.48214<0.056.00.31413
LL037含矿钾化花岗岩1.04.1902.8118.31.041353<0.0051690.3412230.084.30.23444
LL038石英硫化物(矿体)2.07.2103.4173.83.82632<0.005488.148110.070.80.45388
LL039石英硫化物(矿体)1.56.0001.877.919.65182<0.0051164.82313<0.052.00.68710
LL040硅化、泥化构造岩(矿体)2.013.3504.258.213.4024120.0051033.024340.163.60.751434
LL041强硅化花岗岩1.51.9601.4826.14.63362<0.0054990.328480.097.21.365821
LL042强硅化弱钾化花岗岩2.00.0740.082.00.13213<0.0052240.291300.115.90.26317

剖面4:

-720 m

47支3

的97川

LL101中等钾化花岗岩00.0020.020.20.0123<0.0051650.601220.054.70.16445
LL102弱钾化花岗岩00.0020.020.40.0444<0.0055680.3410<2<0.056.60.403928
LL103中等钾化花岗岩4.00.0040.010.20.0122<0.0051630.33<119<0.055.30.19431
LL104黄铁矿化花岗岩3.02.7403.8524.620.9032511<0.005680.9324170.073.00.49512
LL105强钾化花岗岩1.00.2390.291.60.95194<0.0051190.42115<0.053.30.18310
LL106中等钾化花岗岩2.034.0004.604.615.453433<0.0051640.98317<0.054.60.26512
LL107中等钾化花岗岩3.00.0410.020.10.0427<0.0051250.47<120<0.055.71.34427
LL108花岗岩00.0280.060.30.1536<0.0053940.49123<0.058.30.421722

剖面5:

-620 m

47号脉

87线

LL293钾化花岗岩00.0230.020.80.081<1<0.0051090.61<123<0.056.60.1837
LL294硅化硫化物(矿体)2.50.4660.9822.03.7039<1<0.005250.354140.051.30.1118<2
LL295中等硅化花岗岩2.00.0270.060.40.132<1<0.0052400.28228<0.051.20.3942
LL296弱钾化花岗岩1.00.1050.112.10.2526<0.0052570.34319<0.057.00.3036

图2

矿体剖面中Au元素与微量元素含量变化曲线(a)~(g)为指示意义明显的元素,即与金含量同步升降的元素;(h)~(n)为指示意义弱的元素,即与金含量相关性弱的元素"

表2

矿体指示元素统计"

剖面号矿体及位置最佳指示元素弱指示意义元素指示意义不明的元素
1-570 m175支2的84川Au,Ag,Bi,As,Ni,CoSb,Hg,UCu,Pb,Mn,Mo,Th,V,Zn
2-620 m175支2的74川Au,Ag,Bi,As,SbCo,Ni,Cu,MoHg,Mn,Pb,Th,U,V,Zn
3-670 m175支2的88川Au,Ag,Bi,AsMo,Ni,Co,VCu,Hg,Mn,Pb,Sb,Th,U,Zn
4-720 m47支3的97川Au,Ag,Bi,As,CoCu,MoHg,Mn,Ni,Pb,Sb,Th,U,V,Zn
5-620 m47号脉87线Au,Ag,Bi,As,CoV,NiCu,Hg,Mn,Mo,Pb,Sb,Th,U,Zn
6-570 m50号脉88川Au,Ag,As,Bi,CoCu,Mo,NiHg,Mn,Pb,Sb,Th,U,V,Zn
7-420 m48号脉92线Au,Ag,As,Bi,Co,MoSb,Hg,Cu,Pb,ZnMn,Ni,Th,U,V

表3

玲珑金矿田微量元素含量"

矿体

编号

金含量区间

样品

数量

AuAgAsSbBiHgMnCuPbZnMoCoNiVThU
背景背景区160.0010.010.13<0.050.010.0071462.525220.391.07237.30.27
175号>101335.0708.0660.080.2216.460.010934.118212.90277.0022203.51.11
1~10143.8881.8926.390.114.420.00513468.635181.3558.2111264.00.56
0.1~1.0240.4840.584.800.081.870.0051596.0581110.7618.42384.00.44
0.01~0.10390.0400.070.990.050.130.0071885.520320.482.64275.00.37
<0.01160.0050.020.280.060.030.0051367.117180.391.81263.70.44
47号>1001957.00099.8016.200.07105.000.021528.0603210.9556.006192.10.85
10~100417.2886.4723.900.137.880.01012984.5324992.0327.505103.10.22
1~10132.3762.2123.770.093.720.008268115.12141391.0340.859153.80.38
0.1~1.0310.3640.779.610.061.370.00520158.951190.498.29563.90.25
0.01~0.10460.0380.102.320.060.210.0052085.921330.503.26473.90.31
<0.01210.0040.031.230.050.030.0051575.320270.351.84373.60.28
50号>10113.6008.0741.600.172.150.0051905889.094122.0522.00420.60.10
1~10132.5002.9014.690.100.550.005457297.71971760.876.92342.10.10
0.1~1.0250.2500.445.640.080.340.00548121.426250.633.4810103.40.26
0.01~0.10340.0460.121.240.060.110.00623323.921110.461.68234.10.23
<0.01160.0060.020.380.050.050.0061734.119130.371.38344.60.36
48号1~1017.6709.7140.800.691.290.0127129.04503013.3214.00540.70.30
0.1~1.040.4371.7422.900.220.650.01222043.36391 7871.2521.75453.40.24
0.01~0.10120.0260.121.380.060.110.0052414.027350.392.33345.60.35
<0.0180.0040.030.190.050.030.0051321.52690.421.13136.90.34

图3

基岩样品中Au元素与其他元素之间的相关性图"

图4

金矿物的赋存状态"

表4

招平断裂2个基岩剖面的元素含量变化"

剖面编号

及位置

样品

编号

采样

位置

点位

/m

AuAgAsBiCoCuHgMnMoNiPbThUVZn
1012剖面(郭家埠南侧小公路)1012-5钾化碎裂花岗岩1640.0010.020.20.1543<0.0051660.1921103.20.203550
1012-7绢英岩化碎裂岩1970.0170.040.10.15314<0.0057300.859143.61.062270
1012-7C白色断层泥1970.0080.111.40.25518<0.0058310.6414482.60.802461
1012-8褐铁矿化绢英岩1920.0070.050.30.0526<0.0052 7201.324252.32.031163
1012-9褐铁矿化绢英岩199<0.0010.010.10.0212<0.0058400.543112.40.271415
1012-10褐铁矿化绢英岩化花岗岩200<0.0010.010.10.0111<0.0058461.132118.00.361011
1012-12弱绢英岩化碎裂花岗岩218.5<0.0010.010.10.01<11<0.0053820.361153.90.28211
1012-14绢英岩化碎裂岩2680.0060.020.30.1541<0.0051 0500.833133.00.221313
1012-16糜棱岩化花岗岩4460.0010.010.10.01<11<0.005750.24<1338.11.55233
1021剖面(前花园村东300 m处公路旁)1021-1强钾化花岗岩53<0.0010.091.10.03<17<0.0051480.441195.40.61118
1021-2褐铁矿化硅化花岗岩580.4470.4429.42.45175<0.005691.201713.90.46357
1021-3钾化绢英岩化花岗岩700.0090.031.30.11<19<0.005970.832196.50.29215
1021-5绢英岩3010.0010.090.30.25<112<0.005830.301256.40.21441
1021-8钾化花岗岩337<0.0010.091.40.06<19<0.005470.422815.10.204182

图5

招平断裂2个基岩剖面的元素含量变化"

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