海南富文金矿床矿石、围岩及地层元素地球化学特征及地质意义

doi:10.11872/j.issn.1005-2518.2023.03.128

Abstract

Abstract:

The Fuwen gold deposit is located in Fuwen County，central and northern Hainan Province，and also in the northern margin of the Wuzhishan fold belt of the South China fold system.The Early Cretaceous Lumuwan Formation （K₁l） is mainly exposed in the ore district.The structure in this area is developed，the magmatic volcanic movement is more frequent，the gold mineralization points are more，and the metallogenic geological conditions are better.Geological and mineral work was carried out earlier in the area，including geophysical exploration，geochemical exploration，mineral exploration，etc.，but these works focused on the ore fabric characteristics，sulfide characteristics，ore-forming fluid characteristics and isotope date of the deposit，and the research methods of element geochemical testing of gold deposits are less involved.In order to further explore the source of ore-forming materials of Fuwen gold deposit，this paper analyzed the main，trace and rare earth elements of quartz vein type ore，clastic sedimentary rock and magmatic rock of Lumuwan formation.The chemical analysis of the main components of the clastic sedimentary rocks in Lumuwan Formation shows that the weathering and alteration of the source area are weak，which reflects that the sedimentary rocks were first deposited in the active tectonic belt，and the provenance is mainly felsic rocks.The results of chemical analysis of rare earth elements show that REE is characterized by enriched LREE，lost HREE，and right-inclined normalized curve patterns，and the standardized distribution curves of REE in each sample are basically the same.It is inferred that the ore has homology with strata and rock masses.The results of trace element chemical analysis show that the ore，Lumuwan Formation strata and rock mass （quartz diorite，fine-grained granite） are significantly lost in Ba，Nb，Sr，Hf and enriched in Rb，Th，U，Pb，Sm，and their distribution trends are similar.Comprehensive analysis shows that the formation of Fuwen gold ore body in Hainan is closely related to Lumuwan strata and rock mass.Both of them provide ore-forming materials for the formation of ore bodies，and the deposit type is a magmatic hydrothermal deposit.

Key words: material source, geochemistry, trace element, REE, magmatic hydrothermal gold deposit, Fuwen gold deposit

CLC Number:

P595

Wenwei CUI,Huixia CHAO,Hujun HE,Xingke YANG,Junjie YANG,Haolei ZHU,Xu WU. Element Geochemical Characteristics and Significance of Ore，Wall Rock and Stratum in Fuwen Gold Deposit，Hainan[J].Gold Science and Technology, 2023, 31(3): 423-432.

Figures/Tables 10

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References 0

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岩性	样品编号	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅
无矿化长石石英杂砂岩	GH1	64.10	0.66	13.51	8.31	0.05	2.34	5.09	1.11	3.11	0.15
	GH2	67.09	0.53	12.26	4.63	0.10	1.60	7.03	1.54	3.33	0.12
	GH3	66.62	0.57	14.33	5.03	0.11	2.46	3.61	3.13	2.47	0.13
	GH4	69.25	0.68	12.93	5.09	0.10	2.61	2.97	1.52	3.31	0.15
	GH5	63.61	0.58	10.26	4.82	0.16	1.93	13.17	2.09	2.07	0.14
	GH6	67.19	0.52	12.14	4.96	0.12	1.88	6.92	3.00	1.85	0.12
黄铁矿化砂岩	GH7	66.02	0.53	10.39	4.47	0.12	1.83	10.32	0.43	3.22	0.07
黄铁矿化砂岩	GH8	69.76	0.51	11.67	4.27	0.08	1.83	5.66	0.51	3.58	0.08
平均值		66.71	0.57	12.19	5.20	0.11	2.06	6.85	1.67	2.87	0.12
上地壳平均值		66.00	0.65	15.20	4.50	0.08	2.20	4.20	3.90	3.40	0.15
岩性	样品编号	H₂O⁺	Total	Al₂O₃/TiO₂	K₂O/Na₂O	Fe₂O₃/K₂O	SiO₂/Al₂O₃	CIA	PIA	ICV
无矿化长石石英杂砂岩	GH1	1.46	99.89	20.47	2.80	2.67	4.74	71.71	82.41	1.23
	GH2	1.68	9.91	23.13	2.16	1.39	5.47	65.67	74.35	1.07
	GH3	1.44	99.90	25.14	0.79	2.04	4.65	62.14	65.45	1.17
	GH4	1.30	99.91	19.01	2.18	1.54	5.36	67.06	75.99	1.14
	GH5	1.10	99.93	17.69	0.99	2.33	6.20	62.14	66.21	1.32
	GH6	1.20	99.90	23.35	0.62	2.68	5.53	60.73	63.17	1.25
黄铁矿化砂岩	GH7	2.30	99.70	19.60	7.49	1.39	6.35	71.80	89.29	1.05
黄铁矿化砂岩	GH8	2.06	100.01	22.88	7.02	1.19	5.98	71.73	88.80	0.96
平均值		1.57	99.89	21.41	3.01	1.81	5.47	66.62	75.71	1.15
上地壳平均值		-	-	-	-	-	-	-	-	-

岩性	样品编号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb
石英闪长岩	D043-1	35.46	67.69	9.00	34.07	5.81	1.75	6.42	0.83	4.55	0.89	2.53	0.36	2.15
细粒花岗岩	D043-2	32.14	60.33	8.01	30.02	5.28	1.51	5.91	0.79	4.46	0.89	2.61	0.41	2.37
石英脉型矿石	D050-2	19.75	35.65	4.45	15.59	2.48	0.53	2.55	0.26	1.41	0.25	0.79	0.12	0.70
碎屑沉积岩	ZK1102-XT1	29.68	57.81	7.65	28.65	5.13	1.53	5.69	0.76	4.26	0.82	2.39	0.35	2.10
碎屑沉积岩	ZK1503-XT1	24.67	47.93	5.69	22.88	3.99	0.92	4.21	0.42	2.87	0.53	1.56	0.23	1.29
碎屑沉积岩	ZK1902-XT1	24.62	48.78	6.07	24.24	4.19	0.94	4.38	0.45	3.09	0.55	1.67	0.24	1.34
碎屑沉积岩	ZK1903-XT1	38.52	83.65	9.57	37.95	7.10	1.66	7.64	0.97	5.89	1.03	3.24	0.45	2.65
碎屑沉积岩	ZK2704-XT1	31.38	58.77	7.12	27.06	4.57	0.77	4.90	0.58	3.60	0.69	2.01	0.31	1.83
岩性	样品编号	Lu	Y	∑REE	LREE	HREE	L/H	δEu	δCe	（La/Yb）_N	（La/Sm）_N	（Gd/Yb）_N	（Sm/Yb）_N
石英闪长岩	D043-1	0.34	22.91	171.86	153.79	18.07	8.51	0.87	0.87	11.14	3.84	2.42	2.90
细粒花岗岩	D043-2	0.39	23.03	155.13	137.3	17.83	7.70	0.82	0.86	9.16	3.83	2.02	2.39
石英脉型矿石	D050-2	0.11	7.00	84.64	78.45	6.19	12.67	0.64	0.86	19.07	5.01	2.95	3.80
碎屑沉积岩	ZK1102-XT1	0.34	21.65	147.14	130.44	16.70	7.81	0.86	0.88	9.55	3.64	2.20	2.62
碎屑沉积岩	ZK1503-XT1	0.21	15.96	117.4	106.08	11.32	9.37	0.68	0.92	12.92	3.89	2.64	3.32
碎屑沉积岩	ZK1902-XT1	0.22	17.45	120.78	108.84	11.94	9.12	0.66	0.92	12.42	3.70	2.65	3.35
碎屑沉积岩	ZK1903-XT1	0.44	29.63	200.76	178.45	22.31	8.00	0.68	1.00	9.82	3.42	2.34	2.87
碎屑沉积岩	ZK2704-XT1	0.30	20.05	143.89	129.67	14.22	9.12	0.50	0.89	11.59	4.32	2.17	2.68

样品编号	Li	Be	Sc	V	Cr	Co	Ni	Cu	Zn	Ga	Rb	Sr	Y	Zr	Nb	Cd
D043-1	8.06	2.07	21.31	189.30	69.70	53.44	19.23	14.55	103.80	23.47	156.82	1092.60	22.91	125.99	11.71	0.29
D043-2	8.66	2.21	13.98	90.86	42.23	59.39	16.17	2.73	71.25	20.77	359.79	486.86	23.03	190.84	10.81	0.39
D050-2	97.79	2.06	2.80	35.46	9.14	47.43	9.750	3.61	59.27	13.42	205.51	27.09	7.00	64.44	4.32	0.52
ZK1102-XT1	7.41	1.83	15.90	143.90	29.43	30.72	11.74	11.98	80.24	19.82	205.42	669.71	21.65	181.09	9.88	0.37
ZK1503-XT1	4.61	1.88	6.38	71.82	35.38	24.47	13.92	7.14	59.10	13.71	330.50	103.01	15.96	153.38	8.53	0.83
ZK1902-XT1	24.15	1.58	11.66	111.40	38.93	29.18	14.12	44.92	52.15	14.14	208.77	489.21	17.45	145.22	8.34	0.29
ZK1903-XT1	5.50	2.60	19.31	99.89	57.22	17.61	35.22	3.43	47.03	24.73	519.13	259.34	29.63	148.04	13.60	0.28
ZK2704-XT1	5.79	1.69	6.76	101.40	33.28	21.44	13.13	9.13	81.87	15.41	289.55	179.91	20.05	148.60	9.47	1.02
样品编号	Cs	Ba	La	Sm	Ho	Hf	Ta	Bi	Th	U	Y/Ho	Th/U	Th/Sc	Cr/Zr	Nb/Ta
D043-1	1.83	615.93	35.46	5.81	0.89	4.00	1.02	0.03	9.05	1.57	25.84	5.76	0.42	0.55	11.51
D043-2	5.54	847.96	32.14	5.28	0.89	5.48	1.15	0.20	13.59	4.42	25.91	3.07	0.97	0.22	9.38
D050-2	3.99	196.30	19.75	2.48	0.25	1.98	0.60	0.11	7.80	1.86	28.22	4.19	2.79	0.14	7.21
ZK1102-XT1	4.60	415.18	29.68	5.13	0.82	5.12	0.97	0.14	13.22	2.86	26.55	4.62	0.83	0.16	10.17
ZK1503-XT1	4.86	493.28	24.67	3.99	0.53	4.60	0.96	1.82	10.48	2.91	30.12	3.61	1.64	0.23	8.90
ZK1902-XT1	4.83	469.81	24.62	4.19	0.55	4.16	0.95	0.34	10.41	2.56	31.73	4.07	0.89	0.27	8.76
ZK1903-XT1	11.01	704.06	38.52	7.10	1.03	4.61	1.57	0.28	17.73	4.61	28.76	3.84	0.92	0.39	8.67
ZK2704-XT1	4.440	429.44	31.38	4.57	0.69	4.46	1.11	0.05	15.45	3.36	29.06	4.59	2.29	0.22	8.53

Element Geochemical Characteristics and Significance of Ore，Wall Rock and Stratum in Fuwen Gold Deposit，Hainan

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