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黄金科学技术 ›› 2022, Vol. 30 ›› Issue (3): 366-381.doi: 10.11872/j.issn.1005-2518.2022.03.119

• 矿产勘查与资源评价 • 上一篇    

烃汞叠加晕法在湖南万古金矿区及其外围深部找矿中的应用

陈海龙1,徐质彬1,杨晓弘1,杨海燕1,吴圣刚2,郑伯仁2,高磊2,陈俊辉2   

  1. 1.湖南省遥感地质调查监测所,湖南 长沙 410015
    2.湖南黄金洞矿业有限责任公司,湖南 平江 445614
  • 收稿日期:2021-08-30 修回日期:2021-12-27 出版日期:2022-06-30 发布日期:2022-09-14
  • 作者简介:陈海龙(1968-),男,湖南祁东人,高级工程师,从事地球化学勘查和理论应用研究工作。444352037 @qq.com
  • 基金资助:
    湖南省地质院科研基金项目“构造叠加晕—烃汞测量在金矿深边部找矿预测中的应用示范”(202015)

Application of Hydrocarbon-Mercury Superimposed Halo Method in Deep Prospecting of Wangu Gold Deposit and Its Periphery in Hunan Province

Hailong CHEN1,Zhibin XU1,Xiaohong YANG1,Haiyan YANG1,Shenggang WU2,Boren ZHENG2,Lei GAO2,Junhui CHEN2   

  1. 1.Hunan Provincial Remote Sensing Geological Survey and Monitoring Institute, Changsha 410015, Hunan, China
    2.Hunan Huangjindong Mining Co. , Ltd. , Pingjiang 445614, Hunan, China
  • Received:2021-08-30 Revised:2021-12-27 Online:2022-06-30 Published:2022-09-14

摘要:

为进一步验证烃汞叠加晕法在深部找矿预测中是否具有普适性,在雪峰弧形带北东段万古金矿区及其外围开展烃汞叠加晕深部找矿试验。通过分析已知矿区不同地质体、不同标高烃汞组分演化规律和矿体上部土壤烃汞综合异常结构、叠加特点及空间对应关系,指导万古金矿区外围江东矿段的深部找矿工作。研究表明:(1)万古矿区及其外围江东矿段土壤地球化学场同样存在同生叠加场和深源叠加场,同生叠加异常由于成矿物质来源于地层,Au与烃类组分相关性较差,烃汞异常呈分散状态,异常强度相对较低。(2)深源叠加异常是由于成矿物质来源于深源流体(岩浆或幔源)带来成矿物质的叠加,Au与烃汞相关性较好,烃汞异常中心突出,异常强度较强,烃类异常模式以多峰模式和对偶双峰异常模式为主。(3)烃类异常呈多峰模式出现,说明深部存在多条平行盲脉,而对偶双峰异常模式只出现头部异常峰,尾部异常峰尚未出现,说明矿体往深部延伸良好,深部找矿潜力较好。经工程验证,在江东矿段红层覆盖区取得了良好的预测效果,证实该方法具有较好的普适性。

关键词: 同生叠加异常, 深源叠加异常, 深部成矿预测, 烃汞叠加晕法, 万古金矿, 湖南省

Abstract:

In order to further verify whether the hydrocarbon-mercury superimposed halo method has universality in deep prospecting prediction,a hydrocarbon-mercury superimposed halo deep prospecting test was carried out in the Wangu gold mining area and its periphery in the northeast section of the Xuefeng arc.By analyzing the evolution of hydrocarbon-mercury components of different geological bodies and different elevations in the known mining areas,and the comprehensive abnormal structure,superimposition chara-cteristics and spatial correspondence of hydrocarbon-mercury in the upper soil of the ore body,the deep prospecting in the peripheral Jiangdong ore section is guided.The results show that the soil geochemical field in the Wangu mining area and its surrounding Jiangdong mining section also has a syngenetic superimposition field and a deep source superimposition field.The syngenetic superimposition anomaly is due to the stratum, and the correlation between Au and hydrocarbon components is poor. Hydrocarbon mercury anomalies are in a dispersed state, with relatively low anomalous intensity.Deep source superposition anomaly is the superposition of ore-forming materials caused by deep source fluids(magma or mantle source),and Au has a good correlation with hydrocarbon mercury.The hydrocarbon mercury anomaly center is prominent and the anomaly intensity is strong.The hydrocarbon anomaly patterns are mainly multimodal and dual bimodal anomaly patterns.Hydrocarbon anomalies appear in multimodal patterns,indicating that there are multiple parallel blind veins in the deep,and the dual in the bimodal abnormal pattern,only the head abnormal peak appears,but the tail abnormal peak has not yet appeared.It shows that the ore body extends well to the deep indicating that the mineralization has not yet ended,and there is still a good prospecting potential in the deep part.Through engineering verification,good prediction results have been obtained in the red bed coverage area of Jiangdong ore section.It is proved that the method has good universality.

Key words: syngenetic superposition anomaly, deep source superposition anomaly, deep metallogenic prediction, hydrocarbon-mercury superimposed halo method, Wangu gold deposit, Hunan Province

中图分类号: 

  • P618.51

图1

万古金矿地质简图1.第四系;2.白垩系戴家坪组;3.冷家溪群第四岩性组第二段;4.冷家溪群第四岩性组第一段;5.石英脉;6.断层;7.含金矿脉;8.烃汞剖面及编号"

表1

万古金矿区含矿地层烃汞组分背景含量特征"

背景场参数甲烷乙烷丙烷异丁烷正丁烷异戊烷正戊烷乙烯丙烯吸附汞
区域背景均值11.470.910.630.060.230.050.101.380.851.01
Cv0.580.560.540.550.580.560.550.510.591.98
矿区背景均值17.503.022.310.180.860.190.322.641.912.66
Cv0.540.470.430.530.410.480.440.460.431.50

表2

区域不同地层对应土壤与岩石中烃汞组分含量比值(富集系数)"

地层甲烷乙烷丙烷异丁烷正丁烷异戊烷正戊烷乙烯丙烯吸附汞
冷家溪群0.640.200.150.290.140.170.371.470.8815.38
白垩系0.440.410.410.410.410.420.431.241.003.86

表3

万古金矿区不同地质体烃汞组分含量特征"

特征Au甲烷乙烷丙烷异丁烷正丁烷异戊烷正戊烷乙烯丙烯
背景值3.215.960.510.310.030.110.020.050.780.401.08
矿体>3 00063.487.504.690.511.750.420.678.847.602.70
强蚀变5.9136.474.772.290.200.820.170.325.013.550.81
弱蚀变9.8036.534.312.130.180.710.170.284.483.050.07
未蚀变1.6522.112.741.360.160.450.130.172.481.910.22

表4

万古金矿V2脉各指标相关系数统计"

指标Au甲烷乙烷丙烷异丁烷正丁烷异戊烷正戊烷乙烯丙烯
Au1.00
甲烷0.411.00
乙烷0.420.991.00
丙烷0.360.990.981.00
异丁烷0.550.960.960.971.00
正丁烷0.340.980.961.000.961.00
异戊烷0.330.950.930.980.950.991.00
正戊烷0.320.960.940.990.951.001.001.00
乙烯0.360.990.991.000.960.990.970.981.00
丙烯0.370.990.981.000.971.000.980.991.001.00
0.690.080.030.100.260.120.190.150.070.111.00

图2

万古金矿白荆矿段V2脉R型聚类分析谱系图"

表5

万古金矿505线土壤元素相关系数统计"

指标Au甲烷乙烷丙烷异丁烷正丁烷异戊烷正戊烷乙烯丙烯
Au1.00
甲烷0.311.00
乙烷0.300.861.00
丙烷0.330.700.921.00
异丁烷0.360.740.790.831.00
正丁烷0.220.440.810.920.681.00
异戊烷0.150.090.390.510.320.631.00
正戊烷0.240.280.450.690.590.720.451.00
乙烯0.270.290.080.260.400.070.000.621.00
丙烯0.420.780.650.660.730.420.230.540.651.00
0.290.270.200.290.390.200.200.470.670.541.00

表6

万古金矿529线土壤元素相关系数统计"

指标Au甲烷乙烷丙烷异丁烷正丁烷异戊烷正戊烷乙烯丙烯
Au1.00
甲烷0.021.00
乙烷0.010.971.00
丙烷0.040.880.951.00
异丁烷0.030.800.870.951.00
正丁烷0.070.800.900.980.921.00
异戊烷0.040.730.780.870.850.891.00
正戊烷0.090.440.520.670.700.750.761.00
乙烯0.120.580.580.670.690.680.740.681.00
丙烯0.080.780.830.910.940.880.800.710.771.00
0.040.080.090.140.130.190.150.330.480.211.00

图3

万古金矿505线土壤地球化学剖面1.第四系;2.冷家溪群第四岩性组第二段;3.冷家溪群第四岩性组第一段;4.残坡积物;5.板岩;6.砂质板岩;7.粉砂质板岩;8.矿脉及编号;9.断层及编号;10.地层界线;11.产状;12.探槽位置及编号;13.钻孔位置及编号;14.坑道;15.金品位(×10-6)/真厚度(m);16.甲烷;17.乙烷与丙烷之和;18.异丁烷、正丁烷、异戊烷及正戊烷之和;19.乙烯;20.丙烯"

图4

万古金矿529线土壤地球化学剖面1.第四系;2.冷家溪群第四岩性组第一段;3冷家溪群第四岩性组第二段;4.残坡积物;5.板岩;6.砂质板岩;7.粉砂质板岩;8.矿脉及编号;9.地层界线;10.产状;11.钻孔位置及编号;12.坑道;13.金品位(×10-6)/真厚度(m);14.甲烷;15.乙烷、丙烷之和;16.异丁烷、正丁烷、异戊烷、正戊烷之和;17.乙烯;18.丙烯"

表7

万古金矿江东矿段1线土壤元素相关系数统计"

指标Au甲烷乙烷丙烷异丁烷正丁烷异戊烷正戊烷乙烯丙烯
Au1.00
甲烷0.071.00
乙烷0.091.001.00
丙烷0.080.991.001.00
异丁烷0.090.980.990.991.00
正丁烷0.090.991.001.001.001.00
异戊烷0.090.980.980.991.000.991.00
正戊烷0.110.980.990.990.991.000.991.00
乙烯0.220.040.000.020.050.000.050.021.00
丙烯0.230.020.050.070.010.050.020.070.961.00
0.170.230.190.170.140.160.130.140.400.211.00

图5

万古金矿江东矿段1线土壤地球化学剖面1.第四系;2.上白垩统戴家坪组;3.冷家溪群第四岩性段第二段;4.残坡积物;5.砾岩;6.矿脉及编号;7.地层界线;8.不整合地层界线;9.金品位(×10-6)/真厚度(m);10.甲烷;11.乙烷、丙烷之和;12.异丁烷、正丁烷、异戊烷、正戊烷之和;13.乙烯;14.丙烯"

表8

万古金矿江东矿段1线AS3、AS4综合异常土壤元素相关系数"

指标Au甲烷乙烷丙烷异丁烷正丁烷异戊烷正戊烷乙烯丙烯
Au1.00
甲烷0.151.00
乙烷0.151.001.00
丙烷0.160.991.001.00
异丁烷0.161.001.000.991.00
正丁烷0.161.001.001.000.991.00
异戊烷0.161.001.000.991.000.991.00
正戊烷0.150.991.001.001.001.001.001.00
乙烯0.270.280.230.190.280.200.280.201.00
丙烯0.240.220.160.130.220.140.220.140.981.00
0.070.410.380.370.370.370.370.350.520.421.00

表9

万古金矿江东矿段8线土壤元素相关系数统计"

指标Au甲烷乙烷丙烷异丁烷正丁烷异戊烷正戊烷乙烯丙烯
Au1.00
甲烷0.371.00
乙烷0.371.001.00
丙烷0.361.001.001.00
异丁烷0.361.001.001.001.00
正丁烷0.361.001.001.001.001.00
异戊烷0.371.001.001.001.001.001.00
正戊烷0.340.980.980.980.980.980.981.00
乙烯0.170.050.050.070.070.050.050.211.00
丙烯0.080.080.080.100.090.070.070.220.891.00
0.030.120.120.110.110.120.120.030.320.401.00

图6

万古金矿江东矿段8线土壤地球化学剖面1.第四系;2.上白垩统戴家坪组;3.冷家溪群第四岩性段第二段;4.残坡积物;5.砾岩;6.砂质板岩;7.矿脉及编号;8.地层界线;9.不整合地层界线;10.产状;11.钻孔位置及编号;12.金品位(×10-6)/真厚度(m);13.甲烷;14.乙烷、丙烷之和;15.异丁烷、正丁烷、异戊烷、正戊烷之和;16.乙烯;17.丙烯"

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