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Gold Science and Technology ›› 2020, Vol. 28 ›› Issue (5): 712-726.doi: 10.11872/j.issn.1005-2518.2020.05.105

• Mineral Exploration and Resource Evaluation • Previous Articles     Next Articles

Composition Typomorphic Characteristics of Pyrite and Its Genetic Implication for Gold Deposits in Tongdao County,Hunan Province

Hua GAO1(),Yuhua XIE1,Liang YANG1,Zhe ZHANG1,Xinxing KE1,Xiaomin LIU1,Jianbiao LUO2,3,Qi LIU2,3,Jishun LIU2,3,Zhilin WANG2,3,Hua KONG2,3()   

  1. 301.301 Brigade,Hunan Nuclear Industry Geological Bureau,Changsha 410114,Hunan,China
    2.Key Laboratory of Metallogenic Prediction of Nonferrous Metals,Ministry of Education,Central South University,Changsha 410083,Hunan,China
    3.School of Geoscience and Info-Physics,Central South University,Changsha 410083,Hunan,China
  • Received:2020-06-11 Revised:2020-08-18 Online:2020-10-31 Published:2020-11-05
  • Contact: Hua KONG E-mail:gh301@126.com;konghua2006@126.com

Abstract:

Tongdao county is located in southwest of Xuefeng arc structure belt,there are some small and medium-sized gold deposit such as Jinkeng deposit,Huanggou deposit and Chaxi deposit.Few research have done in this area,in order to discuss the genesis of gold deposit,this paper focuses on the genetic mineralogy study about pyrites of different occurrence.The macroscopic geological characteristics of the three deposits show that the wall rocks of the ore body are all low-grade metamorphic sandstone slate.Strong silicification alteration and fading alteration occurred in the surrounding rocks near ore-bearing quartz veins in Jinkeng mining area.The dip angle of quartz vein is steep in Huanggou mining area,and the tendency is southeast or northwest,the fracture filled with quartz vein is shear fracture.The ore bearing quartz veins in Chaxi mining area are mainly NW steeply dipping veins and their branch gently dipping veins.The gold orebodies are mainly quartz vein type or altered rock type.The ore contains pyrite,arsenopyrite and other sulfides.Generally,the ore vein with more pyrite content has a relatively high gold grade,suggesting that pyrite is the main gold-carrying mineral.Rock-mineral determination show that pyrite is mainly cubic and pentagonal dodecahedron and other semi automorphic granular in three gold deposit.MLA(mineral liberation analyzer) scanning results show that gold was produced in pyrite farcture or pyrite intergranular in Huanggou gold deposit.Major element results analyzed by EPMA show that the pyrites in general are rich in iron and deficient in sulfur,containing a small amount of arsenic.The δFe-δS diagram shows that all points from three deposit concentrate in a narrow range,which is consistent with metamorphic hydrothermal gold deposit.Trace elements results analyzed by LA-ICPMS show that average Co/Ni value for Jinkeng pyrite samples is less than 1,which implies the fluid are from metamorphic water mainly.There are two kinds of pyrites in Huangou deposit,one produced in fine quartz vein,the Co/Ni value is near 0,the other zonal pyrite produced in wall rocks near ore,the Co/Ni value of core and edge are quite different,which implies the zonal pyrites have multi-stage growth history.As-Co-Ni diagram show that pyrites from Jinkeng and Huanggou deposit are mainly metamorphic hydrothermal type,and the metallogenic temperature should be medium low temperature.Compared with that of Huanggou gold deposit,pyrites collected from Jinkeng deposit has higher trace element content(e.g.,Au,Ag,Cu,Pb and Zn),which suggests that the Jinkeng area has more better prospecting potential.According to less private mining,we infer the gold body are eroded slightly,there is still great prospecting in deep part of the deposit.

Key words: pyrite, composition typomorphism, gold deposit, genesis of deposit, Tongdao area, Hunan Province

CLC Number: 

  • P618.51

Fig.1

Geological sketch of Xuefeng arc structure belt[22]"

Fig.2

Geological map of Jinkeng-Huanggou mining area[23]"

Fig.3

Geological map of Chaxi mining area[24]"

Table 1

Sample collection information of rock and ore from gold deposit"

矿床名称采样位置样品编号样品简单描述矿石矿物及其组合
金坑地表露头SIF硅化带24-11含硫化物石英脉毒砂、黄铁矿
地表露头V1号脉24-12含硫化物石英脉毒砂、黄铁矿、黄铜矿
ZK601中H38-718-11硅化石英砂岩黄铁矿、毒砂
黄垢Ⅰ号矿体25-02含薄膜状黄铁矿脉石英脉黄铁矿
Ⅰ号矿体25-04含硫化物细脉围岩金红石、黄铁矿、闪锌矿
Ⅱ号矿体25-16蚀变岩黄铁矿
茶溪坑道内NW向矿体26-02含矿石英脉黄铁矿、赤铁矿
坑道内SN向矿体26-06含矿石英脉黝铜矿、黄铜矿、自然银

Fig.4

Field characteristics of ore-bearing quartz veins in the gold deposit in Tongdao area"

Fig.5

Ore micro-fabric in Jinkeng deposit"

Fig.6

Ore micro-fabric in Huanggou deposit"

Fig.7

Ore micro-fabric in Chaxi deposit"

Fig.8

Occurrence of gold in Huanggou deposit"

Table 2

Analysis results of pyrite by EPMA(%)"

样号类别产状自形程度AsSFeS/Fe
24-11-17PyJ石英大脉中半自形0.2654.3347.372.00
24-11-19PyJ石英大脉中半自形0.3554.3247.262.01
24-12-10PyJ石英大脉中半自形0.2754.3047.302.00
25-02-02PyH-1细脉中他形0.2354.0147.182.00
25-02-03PyH-1细脉中他形0.1853.8946.882.01
25-02-04PyH-1细脉中他形0.2253.7646.632.01
25-02-05PyH-1细脉中他形0.1753.9046.902.01
25-02-06PyH-1细脉中他形0.2353.9147.591.98
25-04-01PyH-3细脉中他形0.2053.7747.341.98
25-04-04PyH-3细脉中他形0.6153.2246.811.99
25-04-05PyH-3细脉中他形0.1853.8247.611.97
25-04-06PyH-3细脉中他形0.3452.1146.761.95
25-04-09PyH-3细脉中他形0.3653.9747.401.99
25-04-10PyH-3细脉中他形0.1853.9247.291.99
25-04-11PyH-3细脉中他形0.2253.4946.931.99
25-16-01PyH-4环带自形(核)0.3653.4547.611.96
25-16-02PyH-4环带自形0.9253.7147.331.98
25-16-07PyH-4环带自形(核)0.3553.3347.741.95
25-16-08PyH-4环带自形0.2253.7447.571.97
25-16-09PyH-4环带自形0.4053.5647.591.97
25-16-10PyH-4环带自形(边)0.2053.8947.811.97
25-16-11PyH-4环带自形(核)0.6151.8246.311.95
25-16-12PyH-4环带自形0.2053.8947.301.99
25-16-16PyH-4环带自形0.1953.9147.651.98
25-16-19PyH-4环带自形(核)0.3153.5047.771.96
25-16-20PyH-4环带自形0.2253.6347.811.96
25-16-21PyH-4环带自形0.1853.9447.801.97
25-16-22PyH-4环带自形0.4353.5546.911.99
25-16-23PyH-4环带自形(边)0.2753.9347.741.97
25-16-27PyH-4环带自形0.4453.6047.421.97
25-16-28PyH-4环带自形0.1754.2747.432.00
25-16-29PyH-4环带自形(边)0.2054.3647.212.01
25-16-24PyH-5细粒黄铁矿他形0.2154.3647.092.02
25-16-25PyH-5细粒黄铁矿半自形2.8352.3546.651.96
26-02-03PyC石英大脉中他形1.8852.1846.461.96
26-02-04PyC石英大脉中他形0.8953.846.902.00
26-02-05PyC石英大脉中他形2.5252.1447.061.93

Table 3

Trace element analysis results of pyrite by LA-ICPMS"

类别样号FeAsAuCoNiCuZnPbAgTiCrCo/Ni
PyJ24-11-01L46.45646.132.212.337.0719.2830.152.157.704.610.820.33
24-11-02L46.391 431.283.634.9811.70139.1732.731.3610.493.770.770.43
24-11-03L46.371 828.242.5722.9117.0520.3631.112.523.683.500.251.34
24-11-04L46.43978.372.5618.1118.3027.9215.935.2118.903.300.470.99
24-11-05L46.351 062.6814.0730.6317.8224.9413.815.3428.893.170.771.72
PyH-125-02-01L46.4441.850.021.734.145.460.000.000.003.412.040.42
25-02-02L46.498.890.010.9911.6838.562.150.010.293.090.780.08
25-02-03L46.4962.290.001.2410.256.160.000.000.482.665.330.12
25-02-04L46.4819.530.012.9919.3711.873.100.000.244.180.260.15
25-02-05L46.4827.910.020.160.9288.751.930.000.053.780.800.17
PyH-225-04-01L46.4910.410.00126.04116.601.260.000.700.003.480.221.08
25-04-07L46.5114.080.005.3521.690.350.000.120.013.600.380.25
25-04-08L46.42122.170.01782.49204.351.086.991.030.033.220.163.83
25-04-09L46.493.350.0173.3073.120.576.930.440.032.910.161.00
25-04-10L46.527.140.009.7628.380.547.670.220.013.020.260.34
PyH-325-04-02L46.41801.530.15323.7594.965.322.162.410.163.840.143.41
25-04-03L46.482.840.001.166.893.062.810.000.013.670.890.17
25-04-04L46.475.900.0316.5935.34158.201.170.080.203.140.760.47
25-04-05L46.486.790.0052.09118.15108.532.140.000.593.820.590.44
25-04-06L46.5010.420.003.8711.6522.233.890.000.173.740.680.33
PyH-425-16-01L45.872 658.040.044.5983.002.146.070.020.0710.744.180.06
25-16-02L46.5066.780.003.1669.480.770.000.000.032.640.500.05
25-16-03L46.5321.090.000.325.352.510.000.010.012.710.080.06
25-16-05L46.401 201.340.005.2590.481.854.540.020.003.450.870.06
25-16-06L46.233 594.840.000.328.543.800.000.010.043.381.390.04
25-16-07L46.5117.910.000.061.460.217.710.000.003.730.140.04
PyH-525-16-04L46.431 149.250.015.2285.031.370.000.010.003.760.170.06
25-16-08L45.2966.900.002.1655.1041.180.000.030.0713.876.920.04
25-16-09L46.4770.510.012.3063.4351.670.000.020.023.973.560.04
25-16-10L46.46286.990.002.0261.754.754.750.000.003.650.290.03

Fig.9

δFe-δS diagram(a)and the(Fe+S)-As diagram(b) for pyrite[20]"

Fig.10

As-S(a)and Co-Ni(b) correlation diagram for pyrite"

Fig.11

As-Co-Ni diagram for pyrite[17]"

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