湖南通道地区金矿床中黄铁矿成分标型特征及对矿床成因的启示

doi:10.11872/j.issn.1005-2518.2020.05.105

Abstract

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

Hua GAO, Yuhua XIE, Liang YANG, Zhe ZHANG, Xinxing KE, Xiaomin LIU, Jianbiao LUO, Qi LIU, Jishun LIU, Zhilin WANG, Hua KONG. Composition Typomorphic Characteristics of Pyrite and Its Genetic Implication for Gold Deposits in Tongdao County，Hunan Province[J].Gold Science and Technology, 2020, 28(5): 712-726.

Figures/Tables 14

Fig.1

Fig.2

Fig.3

Table 1

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Table 2

Table 3

Trace element analysis results of pyrite by LA-ICPMS"

类别	样号	Fe	As	Au	Co	Ni	Cu	Zn	Pb	Ag	Ti	Cr	Co/Ni
PyJ	24-11-01L	46.45	646.13	2.21	2.33	7.07	19.28	30.15	2.15	7.70	4.61	0.82	0.33
	24-11-02L	46.39	1 431.28	3.63	4.98	11.70	139.17	32.73	1.36	10.49	3.77	0.77	0.43
	24-11-03L	46.37	1 828.24	2.57	22.91	17.05	20.36	31.11	2.52	3.68	3.50	0.25	1.34
	24-11-04L	46.43	978.37	2.56	18.11	18.30	27.92	15.93	5.21	18.90	3.30	0.47	0.99
	24-11-05L	46.35	1 062.68	14.07	30.63	17.82	24.94	13.81	5.34	28.89	3.17	0.77	1.72
PyH-1	25-02-01L	46.44	41.85	0.02	1.73	4.14	5.46	0.00	0.00	0.00	3.41	2.04	0.42
	25-02-02L	46.49	8.89	0.01	0.99	11.68	38.56	2.15	0.01	0.29	3.09	0.78	0.08
	25-02-03L	46.49	62.29	0.00	1.24	10.25	6.16	0.00	0.00	0.48	2.66	5.33	0.12
	25-02-04L	46.48	19.53	0.01	2.99	19.37	11.87	3.10	0.00	0.24	4.18	0.26	0.15
	25-02-05L	46.48	27.91	0.02	0.16	0.92	88.75	1.93	0.00	0.05	3.78	0.80	0.17
PyH-2	25-04-01L	46.49	10.41	0.00	126.04	116.60	1.26	0.00	0.70	0.00	3.48	0.22	1.08
	25-04-07L	46.51	14.08	0.00	5.35	21.69	0.35	0.00	0.12	0.01	3.60	0.38	0.25
	25-04-08L	46.42	122.17	0.01	782.49	204.35	1.08	6.99	1.03	0.03	3.22	0.16	3.83
	25-04-09L	46.49	3.35	0.01	73.30	73.12	0.57	6.93	0.44	0.03	2.91	0.16	1.00
	25-04-10L	46.52	7.14	0.00	9.76	28.38	0.54	7.67	0.22	0.01	3.02	0.26	0.34
PyH-3	25-04-02L	46.41	801.53	0.15	323.75	94.96	5.32	2.16	2.41	0.16	3.84	0.14	3.41
	25-04-03L	46.48	2.84	0.00	1.16	6.89	3.06	2.81	0.00	0.01	3.67	0.89	0.17
	25-04-04L	46.47	5.90	0.03	16.59	35.34	158.20	1.17	0.08	0.20	3.14	0.76	0.47
	25-04-05L	46.48	6.79	0.00	52.09	118.15	108.53	2.14	0.00	0.59	3.82	0.59	0.44
	25-04-06L	46.50	10.42	0.00	3.87	11.65	22.23	3.89	0.00	0.17	3.74	0.68	0.33
PyH-4	25-16-01L	45.87	2 658.04	0.04	4.59	83.00	2.14	6.07	0.02	0.07	10.74	4.18	0.06
	25-16-02L	46.50	66.78	0.00	3.16	69.48	0.77	0.00	0.00	0.03	2.64	0.50	0.05
	25-16-03L	46.53	21.09	0.00	0.32	5.35	2.51	0.00	0.01	0.01	2.71	0.08	0.06
	25-16-05L	46.40	1 201.34	0.00	5.25	90.48	1.85	4.54	0.02	0.00	3.45	0.87	0.06
	25-16-06L	46.23	3 594.84	0.00	0.32	8.54	3.80	0.00	0.01	0.04	3.38	1.39	0.04
	25-16-07L	46.51	17.91	0.00	0.06	1.46	0.21	7.71	0.00	0.00	3.73	0.14	0.04
PyH-5	25-16-04L	46.43	1 149.25	0.01	5.22	85.03	1.37	0.00	0.01	0.00	3.76	0.17	0.06
	25-16-08L	45.29	66.90	0.00	2.16	55.10	41.18	0.00	0.03	0.07	13.87	6.92	0.04
	25-16-09L	46.47	70.51	0.01	2.30	63.43	51.67	0.00	0.02	0.02	3.97	3.56	0.04
	25-16-10L	46.46	286.99	0.00	2.02	61.75	4.75	4.75	0.00	0.00	3.65	0.29	0.03

Table 3

Fig.9

Fig.10

Fig.11

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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H38-7	18-11	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
茶溪	坑道内SN向矿体	26-06	含矿石英脉	黝铜矿、黄铜矿、自然银

样号	类别	产状	自形程度	As	S	Fe	S/Fe
24-11-17	PyJ	石英大脉中	半自形	0.26	54.33	47.37	2.00
24-11-19	PyJ	石英大脉中	半自形	0.35	54.32	47.26	2.01
24-12-10	PyJ	石英大脉中	半自形	0.27	54.30	47.30	2.00
25-02-02	PyH-1	细脉中	他形	0.23	54.01	47.18	2.00
25-02-03	PyH-1	细脉中	他形	0.18	53.89	46.88	2.01
25-02-04	PyH-1	细脉中	他形	0.22	53.76	46.63	2.01
25-02-05	PyH-1	细脉中	他形	0.17	53.90	46.90	2.01
25-02-06	PyH-1	细脉中	他形	0.23	53.91	47.59	1.98
25-04-01	PyH-3	细脉中	他形	0.20	53.77	47.34	1.98
25-04-04	PyH-3	细脉中	他形	0.61	53.22	46.81	1.99
25-04-05	PyH-3	细脉中	他形	0.18	53.82	47.61	1.97
25-04-06	PyH-3	细脉中	他形	0.34	52.11	46.76	1.95
25-04-09	PyH-3	细脉中	他形	0.36	53.97	47.40	1.99
25-04-10	PyH-3	细脉中	他形	0.18	53.92	47.29	1.99
25-04-11	PyH-3	细脉中	他形	0.22	53.49	46.93	1.99
25-16-01	PyH-4	环带	自形（核）	0.36	53.45	47.61	1.96
25-16-02	PyH-4	环带	自形	0.92	53.71	47.33	1.98
25-16-07	PyH-4	环带	自形（核）	0.35	53.33	47.74	1.95
25-16-08	PyH-4	环带	自形	0.22	53.74	47.57	1.97
25-16-09	PyH-4	环带	自形	0.40	53.56	47.59	1.97
25-16-10	PyH-4	环带	自形（边）	0.20	53.89	47.81	1.97
25-16-11	PyH-4	环带	自形（核）	0.61	51.82	46.31	1.95
25-16-12	PyH-4	环带	自形	0.20	53.89	47.30	1.99
25-16-16	PyH-4	环带	自形	0.19	53.91	47.65	1.98
25-16-19	PyH-4	环带	自形（核）	0.31	53.50	47.77	1.96
25-16-20	PyH-4	环带	自形	0.22	53.63	47.81	1.96
25-16-21	PyH-4	环带	自形	0.18	53.94	47.80	1.97
25-16-22	PyH-4	环带	自形	0.43	53.55	46.91	1.99
25-16-23	PyH-4	环带	自形（边）	0.27	53.93	47.74	1.97
25-16-27	PyH-4	环带	自形	0.44	53.60	47.42	1.97
25-16-28	PyH-4	环带	自形	0.17	54.27	47.43	2.00
25-16-29	PyH-4	环带	自形（边）	0.20	54.36	47.21	2.01
25-16-24	PyH-5	细粒黄铁矿	他形	0.21	54.36	47.09	2.02
25-16-25	PyH-5	细粒黄铁矿	半自形	2.83	52.35	46.65	1.96
26-02-03	PyC	石英大脉中	他形	1.88	52.18	46.46	1.96
26-02-04	PyC	石英大脉中	他形	0.89	53.8	46.90	2.00
26-02-05	PyC	石英大脉中	他形	2.52	52.14	47.06	1.93

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

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