胶东罗山金矿床成矿流体来源:蚀变岩型和石英脉型矿石载金黄铁矿稀土与微量元素特征约束

doi:10.19657/j.geoscience.1000-8527.2019.01.12

现代地质 ›› 2019, Vol. 33 ›› Issue (01): 121-136.DOI: 10.19657/j.geoscience.1000-8527.2019.01.12

胶东罗山金矿床成矿流体来源:蚀变岩型和石英脉型矿石载金黄铁矿稀土与微量元素特征约束

郭林楠¹(), 黄春梅¹^,², 张良², 陈炳翰²^,³, 李瑞红²^,⁴, 刘跃²^,⁵

1.中国地质调查局成都地质调查中心,四川成都 610081
2.中国地质大学(北京) 地质过程与矿产资源国家重点实验室,北京 100083
3.中国地质科学院矿产资源研究所,北京 100037
4.中国地质科学院地球物理地球化学勘查研究所,河北廊坊 065000
5.澳大利亚墨尔本大学地球科学学院,墨尔本 3010

收稿日期:2018-05-10 修回日期:2018-09-12 出版日期:2019-02-26 发布日期:2019-02-28
作者简介:郭林楠,男,工程师,博士,1989年出生,矿物学、岩石学、矿床学专业,从事地质矿产研究工作。Email:linnanguo@163.com。
基金资助:
中国地质调查局地质调查项目(121201010000150013);国家自然科学基金面上项目(41572069);国家重点研发项目子课题(2016YFC0600107-4)

Source of Ore-forming Fluids in the Luoshan Gold Deposit, Jiaodong: Constrains from REE and Trace Element Features of Auriferous Pyrite in the Altered-rock Type and Auriferous Quartz Vein Type Ores

GUO Linnan¹(), HUANG Chunmei¹^,², ZHANG Liang², CHEN Binghan²^,³, LI Ruihong²^,⁴, LIU Yue²^,⁵

1. Chengdu Center, China Geological Survey, Chengdu, Sichuan 610081, China
2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
3. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037,China
4. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang, Hebei 065000,China
5. School of Earth Sciences, The University of Melbourne, Melbourne 3010, Australia

Received:2018-05-10 Revised:2018-09-12 Online:2019-02-26 Published:2019-02-28

摘要/Abstract

摘要：

罗山金矿床是胶东玲珑金矿田最大的金矿床之一,同时发育蚀变岩型矿化和石英脉型矿化。本研究在系统的野外和镜下工作基础上,利用电感耦合等离子体质谱(ICP-MS)技术分析了载金黄铁矿的微量和稀土元素,对比了蚀变岩型和石英脉型矿石载金黄铁矿稀土和微量元素特征,探讨了成矿流体的性质与来源。黄铁矿稀土总含量较低,多呈较明显的“右倾”式稀土配分模式,总体表现出负Eu异常,基本无Ce异常;Hf/Sm、Th/La、Nb/La值均<1,推断成矿流体为富Cl的还原性流体。Co/Ni比值范围在0.08~3.77,平均值为1.09;Co/Ni值以及Co、Ni、Bi、Cu和Zn含量均与变质热液型金矿平均含量相近;Y/Ho比值范围总体在21~32之间,与中国东部大陆地壳Y/Ho比值(20~35)基本重合;结合个别样品的弱正Eu异常以及前人的研究成果,推断成矿流体与变质热液类似,主要来源于古太平洋板块俯冲板片脱水和脱碳作用,且可能有长英质岩浆流体和地壳流体的混入。蚀变岩型和石英脉型矿石内的载金黄铁矿的稀土、微量元素组成没有明显区别,Y/Ho、Nb/Ta和Zr/Hf比值变化范围均很小,表明两类矿石的载金黄铁矿为同一期热液活动作用的产物。

关键词: 载金黄铁矿, 稀土与微量元素, 成矿流体来源, 蚀变岩型和石英脉型矿石, 罗山金矿床, 胶东

Abstract:

The Luoshan gold deposit, one of the biggest gold deposits in the Linglong goldfield, develops both altered-rock type and auriferous quartz vein type mineralization. Based on detailed field and microscopic work, this study measures the trace elements and rare earth elements of the auriferous pyrite with the method of ICP-MS. The characteristics of REE and trace elements in pyrites from the two ore types are compared, and the nature and source of the ore-forming fluids are discussed. The total content of rare earth elements is low, and the REE distribution reveals an obvious light REE enrichment pattern, with negative Eu anomalies and absence of Ce anomalies. The Hf/Sm, Nb/La and Th/La ratios are less than 1, indicating the ore-forming fluids in the Luo-shan gold deposit might be Cl-rich reduced fluids. The Co/Ni ratios of auriferous pyrite range from 0.08 to 3.77, with an average value of 1.09. The Co/Ni ratios and contents of Co, Ni, Bi, Cu and Zn of the pyrite are close to average values of those from metamorphic-hydrothermal type gold deposit. The Y/Ho ratios generally range from 21 to 32, coincident with the continental crust of East China. Combined with weak positive Eu anomalies in few samples, and previous studies, the ore-forming fluids are presumed to be similar to the metamorphic fluid which mainly derived from the dehydration and decarbonization of the subducting paleo-Pacific plate, and may be mixed with felsic magmatic fluid and crustal fluid. There are no obvious differences of REE and trace element composition in the auriferous pyrite from both altered-rock type and auriferous quartz vein type ores, with small Y/Ho, Nb/Ta, and Zr/Hf ranges, which indicate the pyrite from both types of ores was formed in the same hydrothermal activity.

Key words: auriferous pyrite, REE and trace element, source of ore-forming fluid, altered-rock type and auri-ferous quartz vein type ores, Luoshan gold deposit, Jiaodong

中图分类号:

郭林楠, 黄春梅, 张良, 陈炳翰, 李瑞红, 刘跃. 胶东罗山金矿床成矿流体来源:蚀变岩型和石英脉型矿石载金黄铁矿稀土与微量元素特征约束[J]. 现代地质, 2019, 33(01): 121-136.

GUO Linnan, HUANG Chunmei, ZHANG Liang, CHEN Binghan, LI Ruihong, LIU Yue. Source of Ore-forming Fluids in the Luoshan Gold Deposit, Jiaodong: Constrains from REE and Trace Element Features of Auriferous Pyrite in the Altered-rock Type and Auriferous Quartz Vein Type Ores[J]. Geoscience, 2019, 33(01): 121-136.

图/表 13

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序号	样品号	样品名称	采样位置	矿石类型
1	LS13D020B1	石英-硫化物脉	-400 m中段CM22穿脉口	石英脉型
2	LS13D021B1	石英-硫化物脉	-400 m中段CM22穿脉口附近	石英脉型
3	LS13D029B2	石英-硫化物脉	-400 m中段CM12穿脉口附近	石英脉型
4	LS13D063B1	黄铁绢英岩	-560 m中段脉外巷B4测点附近	蚀变岩型
5	LS13D066B1	硅化岩	-560 m中段CM23穿脉内	蚀变岩型
6	LS13D067B1	黄铁绢英岩	-560 m中段CM25穿脉内近主断裂处	蚀变岩型
7	LS13D067B2	黄铁绢英岩	-560 m中段CM25穿脉内近主断裂处	蚀变岩型
8	LS13D068B1	黄铁绢英岩	-560 m中段CM27穿脉内	蚀变岩型
9	LS13D070B13	石英-硫化物脉	-600 m中段1号竖井大巷N15测点附近	石英脉型
10	LS13D071B1	石英-硫化物脉	-600 m中段大巷M59测点	石英脉型
11	LS13D071B2	黄铁绢英岩	-600 m中段大巷M59测点	蚀变岩型
12	LS13D073B1	硅化岩	-600 m中段CM17穿脉内	蚀变岩型
13	LS13D087B1	石英-硫化物脉	-680 m中段盲主井大巷M2测点	石英脉型

序号	样品号	样品名称	采样位置	矿石类型
1	LS13D020B1	石英-硫化物脉	-400 m中段CM22穿脉口	石英脉型
2	LS13D021B1	石英-硫化物脉	-400 m中段CM22穿脉口附近	石英脉型
3	LS13D029B2	石英-硫化物脉	-400 m中段CM12穿脉口附近	石英脉型
4	LS13D063B1	黄铁绢英岩	-560 m中段脉外巷B4测点附近	蚀变岩型
5	LS13D066B1	硅化岩	-560 m中段CM23穿脉内	蚀变岩型
6	LS13D067B1	黄铁绢英岩	-560 m中段CM25穿脉内近主断裂处	蚀变岩型
7	LS13D067B2	黄铁绢英岩	-560 m中段CM25穿脉内近主断裂处	蚀变岩型
8	LS13D068B1	黄铁绢英岩	-560 m中段CM27穿脉内	蚀变岩型
9	LS13D070B13	石英-硫化物脉	-600 m中段1号竖井大巷N15测点附近	石英脉型
10	LS13D071B1	石英-硫化物脉	-600 m中段大巷M59测点	石英脉型
11	LS13D071B2	黄铁绢英岩	-600 m中段大巷M59测点	蚀变岩型
12	LS13D073B1	硅化岩	-600 m中段CM17穿脉内	蚀变岩型
13	LS13D087B1	石英-硫化物脉	-680 m中段盲主井大巷M2测点	石英脉型

样品		La	Ce	Pr		Nd		Sm		Eu	Gd		Tb		Dy	Ho	Er		Tm		Yb		Lu
蚀变岩型矿石	LS13D063B1	2.94	4.96	0.50		1.67		0.24		0.037	0.215		0.014		0.079	0.011	0.032		0.003		0.018		0.003
	LS13D066B1	11.60	21.20	2.29		7.73		1.12		0.101	0.816		0.082		0.310	0.033	0.113		0.011		0.106		0.014
	LS13D067B1	5.06	8.99	0.89		2.95		0.40		0.046	0.353		0.038		0.157	0.023	0.050		0.009		0.048		0.011
	LS13D067B2	0.57	1.04	0.11		0.40		0.07		0.025	0.053		0.012		0.030	0.005	0.011		—		0.008		0.003
	LS13D068B1	4.81	8.80	0.93		3.57		0.52		0.077	0.393		0.051		0.231	0.035	0.085		0.013		0.071		0.014
	LS13D071B2	6.71	11.90	1.35		4.86		0.62		0.082	0.455		0.048		0.214	0.029	0.080		0.010		0.064		0.011
	LS13D073B1	3.58	6.40	0.64		2.24		0.32		0.031	0.221		0.019		0.074	0.008	0.024		0.003		0.017		0.003
石英脉型矿石	LS13D020B1	1.92	3.16	0.35		1.17		0.21		0.023	0.128		0.012		0.048	0.009	0.021		0.004		0.021		—
	LS13D021B1	5.47	8.89	1.00		3.56		0.59		0.049	0.484		0.046		0.171	0.020	0.048		0.005		0.039		0.003
	LS13D029B2	5.06	8.71	1.00		3.71		0.63		0.208	0.506		0.072		0.314	0.057	0.154		0.022		0.159		0.019
	LS13D070B13	2.44	5.04	0.57		2.21		0.39		0.075	0.202		0.018		0.069	0.007	0.021		—		0.008		—
	LS13D071B1	6.73	11.70	1.22		4.18		0.60		0.092	0.444		0.050		0.152	0.017	0.054		0.005		0.047		0.005
	LS13D087B1	1.48	2.72	0.31		1.12		0.17		0.021	0.124		0.013		0.061	0.013	0.039		0.004		0.029		—
样品		Y	ΣREE		LREE		HREE		LREE/HREE			(La/Yb)_N		(La/Sm)_N		(Gd/Yb)_N		δEu		δCe		Y/Ho
蚀变岩型矿石	LS13D063B1	0.24	10.96		10.35		0.61		17.0			117.2		7.91		9.88		0.50		1.00		21.4
	LS13D066B1	0.85	46.38		44.04		2.34		18.8			78.5		6.69		6.37		0.32		1.01		25.8
	LS13D067B1	0.53	19.55		18.33		1.22		15.1			75.6		8.21		6.08		0.38		1.04		23.0
	LS13D067B2	0.20	2.54		2.22		0.32		7.0			51.3		5.43		5.48		1.27		1.00		39.2
	LS13D068B1	1.00	20.60		18.71		1.89		9.9			48.6		5.90		4.58		0.52		1.02		28.6
	LS13D071B2	0.85	27.29		25.52		1.76		14.5			75.2		7.00		5.88		0.47		0.97		29.4
	LS13D073B1	0.21	13.79		13.21		0.58		22.7			151.1		7.20		10.75		0.36		1.04		26.6
石英脉型矿石	LS13D020B1	0.20	7.27		6.83		0.45		15.3			65.6		6.02		5.04		0.43		0.95		22.7
	LS13D021B1	0.52	20.90		19.56		1.34		14.6			100.6		5.99		10.27		0.28		0.93		26.1
	LS13D029B2	1.58	22.20		19.32		2.88		6.7			22.8		5.21		2.63		1.13		0.95		27.7
	LS13D070B13	0.22	11.27		10.72		0.55		19.5			218.8		4.04		20.89		0.82		1.05		32.0
	LS13D071B1	0.49	25.78		24.52		1.26		19.5			102.7		7.30		7.81		0.55		1.00		28.5
	LS13D087B1	0.31	6.41		5.82		0.59		9.9			36.6		5.69		3.54		0.44		0.98		23.6

样品		La	Ce	Pr		Nd		Sm		Eu	Gd		Tb		Dy	Ho	Er		Tm		Yb		Lu
蚀变岩型矿石	LS13D063B1	2.94	4.96	0.50		1.67		0.24		0.037	0.215		0.014		0.079	0.011	0.032		0.003		0.018		0.003
	LS13D066B1	11.60	21.20	2.29		7.73		1.12		0.101	0.816		0.082		0.310	0.033	0.113		0.011		0.106		0.014
	LS13D067B1	5.06	8.99	0.89		2.95		0.40		0.046	0.353		0.038		0.157	0.023	0.050		0.009		0.048		0.011
	LS13D067B2	0.57	1.04	0.11		0.40		0.07		0.025	0.053		0.012		0.030	0.005	0.011		—		0.008		0.003
	LS13D068B1	4.81	8.80	0.93		3.57		0.52		0.077	0.393		0.051		0.231	0.035	0.085		0.013		0.071		0.014
	LS13D071B2	6.71	11.90	1.35		4.86		0.62		0.082	0.455		0.048		0.214	0.029	0.080		0.010		0.064		0.011
	LS13D073B1	3.58	6.40	0.64		2.24		0.32		0.031	0.221		0.019		0.074	0.008	0.024		0.003		0.017		0.003
石英脉型矿石	LS13D020B1	1.92	3.16	0.35		1.17		0.21		0.023	0.128		0.012		0.048	0.009	0.021		0.004		0.021		—
	LS13D021B1	5.47	8.89	1.00		3.56		0.59		0.049	0.484		0.046		0.171	0.020	0.048		0.005		0.039		0.003
	LS13D029B2	5.06	8.71	1.00		3.71		0.63		0.208	0.506		0.072		0.314	0.057	0.154		0.022		0.159		0.019
	LS13D070B13	2.44	5.04	0.57		2.21		0.39		0.075	0.202		0.018		0.069	0.007	0.021		—		0.008		—
	LS13D071B1	6.73	11.70	1.22		4.18		0.60		0.092	0.444		0.050		0.152	0.017	0.054		0.005		0.047		0.005
	LS13D087B1	1.48	2.72	0.31		1.12		0.17		0.021	0.124		0.013		0.061	0.013	0.039		0.004		0.029		—
样品		Y	ΣREE		LREE		HREE		LREE/HREE			(La/Yb)_N		(La/Sm)_N		(Gd/Yb)_N		δEu		δCe		Y/Ho
蚀变岩型矿石	LS13D063B1	0.24	10.96		10.35		0.61		17.0			117.2		7.91		9.88		0.50		1.00		21.4
	LS13D066B1	0.85	46.38		44.04		2.34		18.8			78.5		6.69		6.37		0.32		1.01		25.8
	LS13D067B1	0.53	19.55		18.33		1.22		15.1			75.6		8.21		6.08		0.38		1.04		23.0
	LS13D067B2	0.20	2.54		2.22		0.32		7.0			51.3		5.43		5.48		1.27		1.00		39.2
	LS13D068B1	1.00	20.60		18.71		1.89		9.9			48.6		5.90		4.58		0.52		1.02		28.6
	LS13D071B2	0.85	27.29		25.52		1.76		14.5			75.2		7.00		5.88		0.47		0.97		29.4
	LS13D073B1	0.21	13.79		13.21		0.58		22.7			151.1		7.20		10.75		0.36		1.04		26.6
石英脉型矿石	LS13D020B1	0.20	7.27		6.83		0.45		15.3			65.6		6.02		5.04		0.43		0.95		22.7
	LS13D021B1	0.52	20.90		19.56		1.34		14.6			100.6		5.99		10.27		0.28		0.93		26.1
	LS13D029B2	1.58	22.20		19.32		2.88		6.7			22.8		5.21		2.63		1.13		0.95		27.7
	LS13D070B13	0.22	11.27		10.72		0.55		19.5			218.8		4.04		20.89		0.82		1.05		32.0
	LS13D071B1	0.49	25.78		24.52		1.26		19.5			102.7		7.30		7.81		0.55		1.00		28.5
	LS13D087B1	0.31	6.41		5.82		0.59		9.9			36.6		5.69		3.54		0.44		0.98		23.6

样品		Li	Be	Sc	V	Cr	Co	Ni		Cu		Zn		Ga		Rb		Sr
蚀变岩型矿石	LS13D063B1	0.124	0.091	0.356	1.39	1.53	105.0	486		648		805		0.69		2.04		6.65
	LS13D066B1	0.088	0.075	0.881	7.11	0.73	82.6	21.9		292		1 357		1.27		3.57		15.80
	LS13D067B1	0.172	0.059	0.634	0.51	0.22	15.8	28.2		515		1 076		0.95		4.22		6.09
	LS13D067B2	0.108	0.028	0.510	0.59	1.12	8.5	30.2		581		2 265		0.75		2.93		2.80
	LS13D068B1	0.089	0.056	0.912	2.07	7.03	71.8	254		545		529		0.77		4.18		11.50
	LS13D071B2	0.032	0.099	0.396	0.50	2.32	41.0	124		730		108		0.58		2.25		4.54
	LS13D073B1	0.070	0.043	0.622	0.47	0.42	34.9	171		461		55.4		0.50		1.95		10.60
	石英脉型矿石	LS13D020B1	0.062	0.015	0.203	2.56	0.14	12.3	151		537		613		0.65		2.77		8.84
LS13D021B1		0.053	0.042	0.187	5.26	0.30	52.1	76.8		309		1 504		0.63		2.46		5.55
LS13D029B2		0.086	0.044	0.368	8.22	1.07	264.0	83.1		581		441		0.92		3.49		14.80
LS13D070B13		0.115	0.103	0.328	0.31	0.92	21.2	33.0		481		44		0.33		0.83		7.44
LS13D071B1		0.090	0.120	0.471	0.74	1.51	513.0	175		850		30		0.73		3.00		2.55
LS13D087B1		0.079	0.101	0.259	0.32	1.18	312.0	292		1 809		191		0.33		0.81		3.73
	华北陆壳	13	1.0	18	110	84	22	40		30		74		18.2		92		330
样品		Y	Mo	Cd	In	Sb	Cs	Ba		W		Tl		Pb		Bi		Th
蚀变岩型矿石	LS13D063B1	0.24	0.75	4.75	0.082	1.21	0.012	83.0		0.19		0.021		2 146		1.64		0.44
	LS13D066B1	0.85	0.76	11.60	0.256	1.72	0.020	15.5		0.60		0.027		1 955		1.61		3.88
	LS13D067B1	0.53	0.56	9.14	0.205	5.76	0.025	53.2		0.23		0.064		3 720		4.04		1.29
	LS13D067B2	0.20	1.39	18.60	0.218	2.71	0.016	38.4		0.05		0.033		6 228		2.36		0.11
	LS13D068B1	1.00	0.84	3.91	0.311	1.53	0.022	30.2		0.19		0.021		3 097		2.31		3.75
	LS13D071B2	0.85	1.15	0.33	0.185	0.69	0.010	6.7		0.10		0.016		609		6.30		1.92
	LS13D073B1	0.21	2.89	0.33	0.113	1.30	0.012	159.0		0.05		0.033		630		3.25		0.66
石英脉型矿石	LS13D020B1	0.20	0.26	4.61	0.143	2.14	0.017	21.9		2.29		0.024		3 716		2.76		0.58
	LS13D021B1	0.52	0.12	11.80	0.186	2.53	0.017	19.7		0.18		0.023		4 511		2.42		2.14
	LS13D029B2	1.58	0.28	3.28	0.034	1.04	0.028	179.0		0.24		0.035		4 604		50.00		0.82
	LS13D070B13	0.22	0.90	0.33	0.245	0.31	0.011	56.7		0.04		0.004		191		2.50		0.04
	LS13D071B1	0.49	1.68	0.16	0.136	0.73	0.017	9.0		0.06		0.020		147		5.34		0.94
	LS13D087B1	0.31	3.70	2.12	0.930	0.63	0.008	2.7		0.05		0.016		1 792		104.00		0.16
	华北陆壳	17	0.5	80	0.05	0.15	1.4	690		0.60		0.40		13		0.14		5.0
样品		U	Nb	Ta	Zr	Hf	Co/Ni		Nb/Ta		Zr/Hf		Hf/Sm		Th/La		Nb/La
蚀变岩型矿石	LS13D063B1	0.38	0.045	0.002	3.20	0.127	0.22		22.5		25.2		0.53		0.15		0.02
	LS13D066B1	0.55	0.579	0.021	8.32	0.391	3.77		27.6		21.3		0.35		0.33		0.05
	LS13D067B1	1.83	0.302	0.012	3.64	0.111	0.56		25.2		32.8		0.28		0.25		0.06
	LS13D067B2	0.04	0.040	0.003	0.85	0.026	0.28		13.3		32.5		0.38		0.20		0.07
	LS13D068B1	1.01	0.133	0.006	6.31	0.258	0.28		22.2		24.5		0.49		0.78		0.03
	LS13D071B2	0.37	0.046	—	3.77	0.107	0.33		—		35.2		0.17		0.29		0.01
	LS13D073B1	0.15	0.013	—	1.34	0.040	0.20		—		33.5		0.12		0.18		0.00
石英脉型矿石	LS13D020B1	0.20	*	*	*	*	0.08		—		—		—		0.30		—
	LS13D021B1	0.34	*	*	*	*	0.68		—		—		—		0.39		—
	LS13D029B2	0.24	*	*	*	*	3.18		—		—		—		0.16		—
	LS13D070B13	0.02	0.013	—	0.18	—	0.64		—		—		—		0.02		0.01
	LS13D071B1	0.15	0.121	0.007	5.20	0.173	2.93		17.3		30.1		0.29		0.14		0.02
	LS13D087B1	0.62	0.129	0.010	0.47	0.019	1.07		12.9		24.9		0.11		0.11		0.09
	华北陆壳	1.0	12	0.8	162	4.5

胶东罗山金矿床成矿流体来源:蚀变岩型和石英脉型矿石载金黄铁矿稀土与微量元素特征约束

Source of Ore-forming Fluids in the Luoshan Gold Deposit, Jiaodong: Constrains from REE and Trace Element Features of Auriferous Pyrite in the Altered-rock Type and Auriferous Quartz Vein Type Ores

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