柴胡栏子金矿黄铁矿的化学成分标型特征及其矿床学意义

doi:10.11872/j.issn.1005-2518.2022.02.061

Abstract

Abstract:

The current reserves of the Chaihulanzi gold deposit can not meet the needs of continuous production of the gold mine，and further deep-edge prospecting should be carried out. Based on the theory of genetic mineralogy，the typomorphic characteristics of pyrite chemical composition in the the mining area were studied by mineral geochemistry method.The results are as follows：（1）The ratio of Co/Ni and the As-Co-Ni triangle diagram of pyrite show that the genesis of pyrite in Chaihulanzi gold deposit is complex，which is restricted by the strata of Jianping Group，regional metamorphism and magmatic hydrothermal activity；（2）The ratio of Au/Ag，S/Se and other characteristic values of pyrite show the characteristics of magmatic hydrothermal solution and the formation of ore-forming fluid is mainly related to the magmatic activity in this area；（3）Pyrite is rich in As，which indicates that gold in pyrite crystal exists as nano-particle gold，which indicates that ore-forming fluid has strong migration and the nano-particle gold has strong adsorption in rocks rich in carbon and clay.According to the composition characteristics of pyrite，combined with regional geology，mining area geology and the characteristics of the alteration zone，it is concluded that the Chaihulanzi gold deposit is mainly related to the intrusion of basic dikes. The basic vein not only brings some ore sources，but also the magmatic hydrothermal fluid brings gold in Jianping Group to further activate and enter into the ore-forming fluid. At the joint of NNE trending compression structural belt and NWW tensile fracture structural zone，the ore-forming fluid and surrounding rock are widely metasomated to form a gold deposit with altered rock type as the main part.There are good prospecting prospects in the deep metamorphic strata of Jianping Group in the southeast of the mining area，especially in the structural development part of the sericite graphite-bearing plagioclase gneisses.

Key words: pyrite, characteristic value, component typomorphic characteristics, geochemical characteristics, nano-particle gold, Chaihulanzi gold deposit, Inner Mongolia

CLC Number:

P618.51

Zhen CHEN, Cuizhi WANG, Guxian LV, Baolin ZHANG, Qipeng ZHANG, Junbin WEI, Xiaoming SHI. Typomorphic Characteristics of Chemical Composition of Pyrite in Chaihu-lanzi Gold Deposit and Its Mineralogy Significance[J].Gold Science and Technology, 2022, 30(2): 165-178.

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样品编号	Ge	As	Se	Au	S	Ag	Te	Sn	Fe	Co	Ni	Cu	Zn	Pb	Sb	总计
CM1709-1	-	0.005	0.051	-	53.579	-	-	-	47.078	0.024	-	0.064	-	-	-	100.801
CM1709-2	-	-	-	0.055	53.506	-	0.016	0.014	47.406	0.103	0.003	0.020	-	-	-	101.123
CM1709-5	-	0.016	0.022	-	53.608	-	0.019	0.009	46.951	0.055	0.035	-	-	-	-	100.715
CM1709-6	0.006	-	-	0.003	53.119	-	-	0.002	46.866	0.117	0.012	-	0.016	-	-	100.141
p103tz5-2-1-3	-	0.011	0.033	0.031	53.296	-	0.002	-	45.769	0.040	0.174	0.012	0.031	0.024	-	99.423
p103tz5-2-1-4	0.015	0.025	-	0.046	53.771	0.006	-	-	46.949	0.051	0.087	0.003	0.024	-	-	100.977
CM2804-1	-	0.105	0.010	-	52.541	-	-	-	45.414	0.108	0.884	0.046	0.078	-	-	99.186
CM2804-2	-	0.096	-	0.061	52.978	0.001	-	-	45.438	0.076	1.181	0.090	-	-	-	99.921
CM2804-3	-	0.034	-	0.018	53.595	0.006	0.029	0.018	45.708	0.552	0.033	-	-	-	0.004	99.997
CM2804-4	-	0.163	0.017	-	54.111	-	0.010	0.051	43.96	1.587	0.055	0.032	0.034	-	-	100.020
CM2804-5	-	0.041	-	0.003	53.315	0.013	-	0.021	46.63	0.290	0.272	0.002	0.003	-	-	100.590
CM2804-6	-	-	0.024	0.052	52.891	-	0.012	-	46.009	0.143	0.301	0.209	-	-	-	99.641
CM2804-7	-	0.068	-	0.073	53.050	0.005	-	0.018	46.003	0.073	0.275	0.015	0.006	-	0.029	99.615
CM2805-1	-	0.018	-	-	53.834	0.051	0.011	-	47.015	0.017	-	-	-	-	-	100.946
CM2805-2	-	0.037	0.050	0.018	53.433	0.004	0.003	-	46.853	0.104	0.004	-	0.043	-	0.018	100.567
CM2802-1	-	1.715	-	0.019	52.388	0.002	0.021	0.012	46.013	0.037	-	0.054	-	-	0.016	100.277
CM2802-2	-	-	-	-	52.381	0.001	0.003	0.026	47.655	0.032	-	0.025	-	-	0.004	100.127

采样位置	样品编号	δS	δFe	S/Fe	晶体化学式	Au/Ag	Se/Te	Co/Ni	S/Se
六中段	CM1709-1	0.241	1.134	1.982	Fe_1.009S₂
	CM1709-2	0.105	1.839	1.966	Fe_1.017S₂
	CM1709-5	0.296	0.861	1.989	Fe_1.006S₂
	CM1709-6	-0.619	0.679	1.974	Fe_1.013S₂
	CM17均值					-	2.0857	5.9800	2 152.5
	p103tz5-2-1-3	-0.288	-1.678	2.028	Fe_0.986S₂
	p103tz5-2-1-4	0.601	0.857	1.995	Fe_1.003S₂
	p103均值					12.8333	16.5000	0.3487	1 993.5
十五中段	CM2804-1	-1.701	-2.440	2.015	Fe_0.993S₂
	CM2804-2	-0.883	-2.389	2.031	Fe_0.985S₂
	CM2804-3	0.271	-1.809	2.042	Fe_0.979S₂
	CM2804-4	1.237	-5.564	2.144	Fe_0.933S₂
	CM2804-5	-0.253	0.172	1.991	Fe_1.004S₂
	CM2804-6	-1.046	-1.162	2.002	Fe_0.999S₂
	CM2804-7	-0.748	-1.175	2.008	Fe_0.996S₂
	CM2805-1	0.718	0.999	1.994	Fe_1.003S₂
	CM2805-2	-0.032	0.651	1.986	Fe_1.007S₂
	CM2802-1	-1.987	-1.154	1.983	Fe_1.009S₂
	CM2802-2	-2	2.374	1.914	Fe_1.045S₂
	CM28均值					2.9398	1.1348	1.0047	2 628

Typomorphic Characteristics of Chemical Composition of Pyrite in Chaihu-lanzi Gold Deposit and Its Mineralogy Significance

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