陕西龙头沟金矿黄铁矿标型特征及其找矿意义

doi:10.11872/j.issn.1005-2518.2022.06.084

Abstract

Abstract:

Pyrite is the main gold-bearing mineral in Longtougou gold deposit.In this paper，the crystal morphology and chemical composition typomorphic characteristics of pyrite in Ⅰ-1 and Ⅳ-1 orebodies were studied from the perspective of minerals，and five points of insights were obtained.The research methods include optical thin section observation under microscope，electron probe，energy spectrum analysis，etc.The results show that the crystal morphology of pyrite in the study area is relatively simple，and pentagonal dodecahedron crystal morphology occupies the highest proportion.In general，the probability of pyrite crystal morphology from high to low is pentagonal dodecahedron，poly，cube and octahedron.The 1 160 m middle section of the study area is the most mineralized section，and the 1 080 m section is the secondary mineralized section，and pentagonal dodecahedral pyrite is superior to other crystal morphology in gold bearing.The w（S）is 52.71% to 67.80%，with an average of 55.79%，and the w（Fe） is 28.66% to 45.33%，with an average of 42.43% in pyrite.In general，the pyrite in this area is sulfur-rich and iron-deficient.Co/Ni values range from 1.383 to 13.333，with an average value of 2.88，w（Se） is about 4×10^-4，and S/Se ratios range from 0.76×10³ to 5.39×10³，indicating that the formation of Longtougou gold deposit is related to volcanic hydrothermal genesis.The score X of crystal morphology and D value range from 0 to -13.33 and 0.6520 to 1.1345 respectively，indicating that the ore body is basically located in the middle and lower part，that is，the engineering control section of the mineralization area is still in the middle and shallow part.There is still prospecting potential in the east of line 131 below 1 080 m middle level and Xianggou area to the west of Longtougou gold area.

Key words: pyrite, crystal morphology characteristic, composition typomorphic, prospecting prediction, magmatic hydrothermal gold deposit, Longtougou gold deposit, Shaanxi Province

CLC Number:

P618.51

Xiaoni CUN,Yushan XUE,Yuliang WANG,Xinwei LIU. Typomorphic Characteristics and Prospecting Significance of Pyrite in Longtougou Gold Deposit，Shaanxi Province[J].Gold Science and Technology, 2023, 31(1): 64-77.

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样品编号	采样位置	岩性	矿体编号
LT-1	PD1200-7线	重晶石石英脉	Ⅰ
LT-2	PD1200-15线	黄铁矿化重晶石石英脉	Ⅰ
LT-3	PD12200-23线	黄铁矿化重晶石石英脉	Ⅰ
LT-4	PD1200-31线	黄铁矿化重晶石石英脉	Ⅰ
LT-5	PD1200-55线	黄铁矿化方解石石英脉	Ⅰ
LT-6	1200E-71线	褐铁矿化石英脉	Ⅳ
LT-7	1200E-63线	褐铁矿化石英脉	Ⅳ
LT-8	1160-0线	褐铁矿化石英脉	Ⅰ
LT-9	1160-9线	黄铁矿化石英脉	Ⅰ
LT-10	1160-15线	黄铁矿化石英脉	Ⅰ
LT-11	1160-27线	褐铁矿化石英脉	Ⅰ
LT-12	1160-35线	黄铁矿化重晶石石英脉	Ⅰ
LT-13	1120-127线	黄铁矿化石英脉	Ⅳ
LT-14	1120-CM131	重晶石黄铁矿化石英脉	Ⅳ
LT-15	1120-CM151	黄铁矿化石英脉	Ⅳ
LT-16	1120-CM163	黄铁矿化石英脉	Ⅳ
LT-17	1120-CM171	重晶石化黄铁矿化石英脉	Ⅳ
LT-18	1080-CM135	黄铁矿化石英脉	Ⅳ
LT-19	1080-CM127线	黄铁矿化石英脉	Ⅳ
LT-20	1080-CM157	黄铁矿化石英脉	Ⅳ
LT-21	1080-CM149	黄铁矿化石英脉	Ⅳ
LT-22	1160E-CM63	黄铁矿化重晶石石英脉	Ⅳ
LT-23	1160E-CM71	黄铁矿化石英脉	Ⅳ
LT-24	1160E-CM95N	黄铁矿化石英脉	Ⅳ
KPH367	ZK15501	金矿体	Ⅳ
KPH240	ZK13101	金矿体	Ⅳ

样品编号	标高/m	w（Fe）/%	w（S）/%	晶体化学式
Lt-18-03-Py	1 080	44.48	53.82	Fe_0.945S₂
Lt-18-01-Py	1 080	44.98	53.85	Fe_0.955S₂
Lt-19-01-Py	1 080	37.21	60.86	Fe_0.699S₂
Lt-20-01-Py	1 080	39.33	58.95	Fe_0.762S₂
Lt-20-03-Py	1 080	37.98	59.49	Fe_0.729S₂
Lt-20-02-Py	1 080	39.77	59.69	Fe_0.761S₂
Lt-21-02-Py	1 080	43.93	53.92	Fe_0.931S₂
Lt-21-01-Py	1 080	44.64	54.13	Fe_0.942S₂
Lt-21-01-Py	1 080	44.87	53.93	Fe_0.951S₂
Lt-19-02-Py	1 080	32.00	65.25	Fe_0.560S₂
Lt-19-02-Py	1 080	28.66	67.80	Fe_0.483S₂
Lt-13-03-Py	1 120	43.66	53.51	Fe_0.932S₂
Lt-14-02-Py	1 120	43.70	53.95	Fe_0.926S₂
Lt-14-01-Py	1 120	44.46	53.35	Fe_0.952S₂
Lt-15-01-Py	1 120	42.14	55.72	Fe_0.864S₂
Lt-15-02-Py	1 120	43.83	55.91	Fe_0.896S₂
Lt-15-04-Py	1 120	42.16	55.81	Fe_0.863S₂
Lt-15-05-Py	1 120	44.94	52.71	Fe_0.974S₂
Lt-16-01-Py	1 120	45.13	53.11	Fe_0.971S₂
Lt-17-01-Py	1 120	44.74	53.38	Fe_0.958S₂
Lt-17-03-Py	1 120	45.12	53.19	Fe_0.969S₂
Lt-22-01-Py	1 160	45.33	53.42	Fe_0.969S₂
Lt-22-03-Py	1 160	45.27	53.57	Fe_0.966S₂
Lt-23-01-Py	1 160	45.06	53.96	Fe_0.954S₂
Lt-23-02-Py	1 160	44.96	53.46	Fe_0.961S₂
Lt-24-03-Py	1 160	44.79	53.71	Fe_0.953S₂

样品编号	采样标高 /m	晶形	w（B）/%											总计
样品编号	采样标高 /m	晶形	As	Se	Cu	Ni	Co	Fe	Au	S	Ag	Sb	Te	总计
LT-15-1	1 120	碎裂他形	0.01	0.01	0.03	0.02	0.07	46.13	0.02	53.91	0.03	-	-	100.21
LT-15-2	1 120	五角十二面体	0.06	-	0.02	0.02	0.02	46.93	0.02	53.61	0.04	-	0.05	100.77
LT-24-1	1 160	碎裂他形	0.55	-	0.01	-	0.02	46.67	-	53.94	0.01	-	-	101.19
LT-24-2	1 160	碎裂他形	-	-	0.01	0.02	0.08	46.81	0.06	54.53	-	0.02	-	101.52
LT-14-1	1 120	立方体	0.28	-	0.03	0.00	0.01	45.10	-	52.87	0.02	0.02	-	98.33
LT-14-2	1 120	立方体	-	0.07	-	-	0.06	44.57	0.08	53.45	-	0.00	0.02	98.24
LT-20-1	1 080	立方体	1.15	-	0.01	-	0.05	45.60	0.05	53.09	0.02	0.01	0.01	100.00
LT-20-2	1 080	八面体	0.17	-	0.01	0.00	0.05	46.33	0.03	53.99	0.02	0.00	-	100.60
LT-4-1	1 200	碎裂他形	-	-	0.01	0.01	0.03	46.22	-	54.21	0.01	0.00	0.01	100.50

矿床产地	黄铁矿晶形	w（Au）/（×10^-6）	矿床产地	黄铁矿晶形	w（Au）/（×10^-6）
早子沟金矿	五角十二面体	2.03	小秦岭地区	五角十二面体	含金量高
早子沟金矿	立方体	<0.10	小秦岭地区	立方体	<2.00
太白庙金矿	五角十二面体	227.90	团结沟金矿	五角十二面体	最高达466.6
太白庙金矿	立方体	100.41	团结沟金矿	立方体	含金量低
陕西卡林型金矿	五角十二面体为主	70.20~149.50	耿庄金矿	五角十二面体为主	64.60~105.00
陕西卡林型金矿	立方体	7.83~13.10	耿庄金矿	立方体	<4.00
大麻花金矿	五角十二面体为主	70.00	义兴寨金矿	五角十二面体为主	>100，最高450
大麻花金矿	立方体	含金量低	义兴寨金矿	立方体	<30.00

样品编号	采样标高/m	n（Au）/n（Ag）	D
LT-14、LT-15	1 120	0.9127	0.8947
LT-24	1 160	1.6429	1.0890
LT-4	1 200	0	0.6520

Typomorphic Characteristics and Prospecting Significance of Pyrite in Longtougou Gold Deposit，Shaanxi Province

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