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黄金科学技术 ›› 2022, Vol. 30 ›› Issue (2): 179-195.doi: 10.11872/j.issn.1005-2518.2022.02.075

• 矿产勘查与资源评价 • 上一篇    下一篇

山东曹家洼金矿石头顶矿段土壤地球化学特征及找矿预测

何金霖1(),李俊1(),许慧玲1,曹李慧2,孙德华2   

  1. 1.昆明理工大学国土资源工程学院,云南 昆明 650093
    2.曹家洼金矿,山东 招远 265400
  • 收稿日期:2021-06-10 修回日期:2021-12-02 出版日期:2022-04-30 发布日期:2022-06-17
  • 通讯作者: 李俊 E-mail:1059984111@qq.com;1165978835@qq.com
  • 作者简介:何金霖(1997-),男,吉林吉林市人,硕士研究生,从事地球化学研究工作。1059984111@qq.com
  • 基金资助:
    曹家洼金矿股份有限公司与昆明理工大学校企合作项目“招远市曹家洼金矿石头顶矿段土壤地球化学分析及找矿预测”(619320200073)

Soil Geochemical Characteristics and Prospecting Prediction of Shitouding Ore Section of Caojiawa Gold Deposit in Shandong Province

Jinlin HE1(),Jun LI1(),Huiling XU1,Lihui CAO2,Dehua SUN2   

  1. 1.Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
    2.Caojiawa Gold Mine, Zhaoyuan 265400, Shandong, China
  • Received:2021-06-10 Revised:2021-12-02 Online:2022-04-30 Published:2022-06-17
  • Contact: Jun LI E-mail:1059984111@qq.com;1165978835@qq.com

摘要:

曹家洼金矿石头顶矿段地处胶西北金矿集区招平断裂下盘,矿段内黄铁绢英岩—绢英岩化蚀变强烈。通过开展1∶1万土壤地球化学测量,在曹家洼金矿石头顶矿段共圈定出41个单元素异常和12个组合元素异常。综合成矿地质条件、矿化蚀变特征和物探结果,对土壤化探数据信息进行挖掘,绘制了因子组合异常图,划分出4个有利成矿区(靶区编号为H1~H4)。其中,H4和H2靶区的金变异系数为0.98,异常平均值高达4.9×10-9~5.3×10-9,具有较好的找矿潜力。目前,曹家洼矿区在H4靶区0号线施工钻孔,于ZK1钻孔154 m处揭露矿体,验证了靶区的找矿潜力。研究表明:Au-Ag-Hg为矿致异常,异常走向与招平断裂一致,矿体严格受构造控制,该矿区内Hg和Ag元素可作为指示性元素,为找矿提供重要依据。

关键词: 土壤地球化学测量, R型聚类分析, 地球化学特征, 找矿潜力, 曹家洼金矿

Abstract:

Shitouding ore section of Caojiawa gold deposit is located at the footwall of Zhaoping fault belt in the northwestern Jiaodong gold concentration area.Field exploration and drilling found that this section has strong pyritic sericite alteration,which is the main symbol of ore-forming surrounding rocks in this area.It has good metallogenic prospects,but no breakthrough has been made in prospecting work.After carrying out 1∶10 000 soil geochemical survey,we used correlation analysis and R-type cluster analysis and other methods to study the distribution characteristics of element anomalies in the working area from the perspective of geostatistics.With previous geological data and current exploration situation,the anomalies were delineated and four target areas of H1~H4 were divided,all of which had good metallogenic prospects.Regarding the geochemical prediction and geophysical results,it is found that the variation coefficient of gold in H4 and H2 target areas was 0.976,and the average anomaly value was 4.9×10-9~5.3×10-9,which was consistent with the geophysical results.It is speculated that the anomaly is caused by ore.

Key words: soil geochemical survey, R-type cluster analysis, geochemical characteristics, prospecting potential, Caojiawa gold deposit

中图分类号: 

  • P618.51

图1

胶东地区区域地质及金矿床分布图(据 Yang et al.,2014 修改)1.第四纪沉积物;2.新生代玄武岩;3.白垩纪火山岩;4.苏鲁超高压变质岩;5.古生代荆山群和粉子山群;6.太古宙胶东群;7.三叠纪花岗岩;8.侏罗纪花岗岩;9.白垩纪花岗岩;10.断层;11.城市;12.大、中、小型金矿;13.蚀变岩型金矿;14.石英脉型金矿;15.曹家洼金矿"

图2

曹家洼金矿地质图(a)及0号勘查线剖面图(b)1.黄铁绢英岩化花岗岩;2.蚀变石英闪长玢岩;3.黄铁绢英岩化花岗质碎裂岩;4.黄铁绢英岩化碎裂岩;5.黄铁绢英岩;6.0号勘查线"

表1

土壤地球化学元素测试方法"

元素测试方法
Sn、Ag二米光栅摄谱仪WPP2
AuICP-MS Nexion 2000B
As、Sb、Hg原子荧光仪AFS-8220,XGY-1011A
其余元素ICP-MS Nexion 2000B

表2

各元素参数统计"

AuSnAgAsSbHgNiCuZnCoPbW
均值2.491.990.064.660.4013.0920.4813.6842.459.0522.701.33
σ11.090.360.022.060.154.715.623.759.712.803.520.25
σ21.090.360.022.060.154.715.623.759.712.803.520.25
CV10.980.320.810.440.380.540.280.300.270.360.220.25
CV20.440.180.290.440.380.360.270.270.230.310.160.19
背景值1.852.360.054.590.8511.7620.1612.9842.598.9723.161.73
下限4.662.710.098.780.6922.5131.7221.1861.8714.6429.751.84
衬度0.530.740.630.530.570.580.650.650.690.620.760.73
面积1.830.201.400.030.030.250.110.030.060.020.260.06
NAP值0.980.140.880.010.020.140.070.020.040.010.200.05
检测限0.50.50.010.50.115510150.1

图3

曹家洼金矿土壤地球化学测量元素变异系数离散图"

表3

各元素相关性系数统计"

AuSnAgAsSbHgMoNiCuZnCoPbW
Au1.000.010.720.120.140.060.240.030.080.060.140.080.09
Sn0.011.000.020.320.310.170.120.250.280.170.210.040.21
Ag0.720.021.000.030.020.030.160.030.010.080.040.040.07
As0.120.320.031.000.970.300.410.720.720.550.670.340.36
Sb0.140.310.020.971.000.300.430.720.730.560.670.320.33
Hg0.060.170.030.300.301.000.140.320.210.200.250.070.21
Mo0.240.120.160.410.430.141.000.390.390.240.430.160.27
Ni0.030.250.030.720.720.320.391.000.790.580.810.180.43
Cu0.080.280.010.720.730.210.390.791.000.510.720.160.45
Zn0.060.170.080.550.560.200.240.580.511.000.520.640.14
Co0.140.210.040.670.670.250.430.810.720.521.000.280.36
Pb0.080.040.040.340.320.070.160.180.160.640.281.000.01
W0.090.210.070.360.330.210.270.430.450.140.360.011.00

图4

曹家洼金矿土壤地球化学元素R型聚类分析谱系图"

表4

土壤地球化学样品总方差解释"

组件初始特征值提取载荷平方和旋转载荷平方和
总计方差百分比/%累积/%总计方差百分比/%累积/%总计方差百分比/%累积/%
15.5145.9345.935.5145.9345.934.2235.1435.14
21.4111.7957.711.4111.7957.712.0517.1252.26
31.2910.7268.431.2910.7268.431.5312.7264.98
40.877.2475.670.877.2475.671.2810.6975.67
50.746.1381.80
60.655.4487.24
70.554.5491.78
80.463.8195.59
90.221.8797.46
100.161.3398.78
110.120.9699.74
120.030.26100.00

表5

土壤地球化学样品方差极大旋转因子载荷矩阵"

元素因子
F1F2F3F4
Au0.030.210.160.87
Sn0.45-0.030.510.03
Ag0.08-0.28-0.460.67
As0.680.390.370.14
Sb0.680.400.370.12
Hg-0.20-0.10-0.810.02
Ni0.890.200.12-0.08
Cu0.900.190.140.03
Zn0.500.740.11-0.06
Co0.830.340.080.03
Pb0.100.880.050.08
W0.71-0.310.220.13

图5

各元素异常图"

图6

各元素综合异常图1.花岗闪长岩;2.闪长玢岩;3.蚀变石英闪长玢岩;4.黄铁绢英岩化花岗岩;5.黄铁绢英岩化碎裂岩;6.黄铁绢英岩;7.招平断裂;8.Au等值线;9.Ag等值线;10.Hg等值线;11.Cu等值线;12.Co等值线;13.Ni等值线;14.W等值线;15.Sn等值线;16.Zn等值线;17.Pb等值线;18.As等值线;19.Sb等值线"

图7

因子得分等值线异常图"

图8

研究区成矿流体运移示意图1.F1因子等值线;2.F2因子等值线;3.F3因子等值线;4.F4因子等值线"

表5

靶区成矿元素参数统计"

Au/(×10-9Ag/(×10-6Hg/(×10-9面积 /km2
平均值最大值NAP值平均值最大值NAP值平均值最大值NAP值
H15.39.741.130.110.221.1215.028.01.240.15
H24.99.571.050.090.191.0122.825.21.010.18
H34.79.981.010.713.410.4611.522.20.510.067
H44.68.190.980.060.100.6619.328.60.860.11

图9

靶区预测图1.花岗闪长岩;2.闪长玢岩;3.蚀变石英闪长玢岩;4.黄铁绢英岩化花岗岩;5.黄铁绢英岩化碎裂岩;6.黄铁绢英岩;7.招平断裂带;8.Au等值线;9.Ag等值线;10.Hg等值线;11.靶区"

图10

38#勘探线地球化学剖面图1.花岗闪长岩;2.闪长玢岩;3.蚀变石英闪长玢岩;4.黄铁绢英岩化花岗岩;5.黄铁绢英岩化碎裂岩;6.黄铁绢英岩;7.招平断裂带;8.Au等值线;9.Ag等值线;10.Hg等值线;11.38#勘探线"

图11

地球物理勘探靶区预测1.花岗闪长岩;2.闪长玢岩;3.蚀变石英闪长玢岩;4.黄铁绢英岩化花岗岩;5.黄铁绢英岩化碎裂岩;6.黄铁绢英岩;7.IP极化率异常;8.IP视电阻率率异常;9.靶区"

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