赣南印支期白石钨（铜）矿床成矿岩体地球化学特征及地质意义

doi:10.11872/j.issn.1005-2518.2023.05.062

Abstract

Abstract:

The Baishi W-Cu deposit is a medium-sized quartz vein type deposit formed in Indosinian in southern Jiangxi Province.It belongs to the Nanling metallogenic belt.Although it had been exploited since the founding of the People’s Republic of China，few studies have been done on ore-forming mass.The Baishi granite is the main magmatic rock exposed in the mining area and it is recognized as the ore-forming rock.The Baishi granite has undergone carbonation，chlorite，and muscovite alteration.The Baishi granite has obvious tungsten and copper mineralization.In order to probe into the magma genesis and its relationship with metallogenesis，this study conducted detailed geochemical analysis for the Baishi granite.From the feature of the major elements，the Baishi granite has relatively high SiO₂ contents （71.59%~75.36%），total alkali content（Na₂O+K₂O：6.28%~7.45%），aluminum saturation index（A/CNK：1.71~2.11） and differentiation index（DI：81.53~90.39）.It can be inferred that the Baishi granite is peraluminous granite and it has a high degree of differentiation.In the characteristics of rare earth elements，the Baishi granite exhibits obvious enrichment of light rare earth elements，relative depletion of heavy rare earth elements（LREE/HREE=9.94~12.29） and obvious Eu negative anomaly（δEu=0.28~0.57）.Additionally，in the diagram of trace element spider pattern，the Baishi granite is relatively enriched in large ion lithophile elements，such as Rb，Th and U，and depleted in high field strength elements，such as Nb and Ti.While Ba is depleted relative to Rb.The geochemical characteristics mentioned above and relevant geochemical diagrams of the Baishi granite display obvious characteristics of differential S-type granites.Based on the comprehensive analysis，it can be concluded that the Baishi granite is formed in the intraplate environment.The Baishi granite’s magma source is crust and it is mainly derived from the pelite.In addition，the fractional crystallization plays more important role in its forming process than partial melting.In terms of the tectonic setting，the Baishi granite was formed in the extensional environment after the Indosinian orogeny.More and more studies have shown that the Indosinian mineralization played an important role in W and Sn mineralization in South China，and the Baishi granite is closely related to the Indosinian mineralization in South China.

Key words: Baishi granite, geochemistry, S-type granite, Indosinian, metallogenesis, southern Jiangxi Province

CLC Number:

P518.2

Li LI, Guoguang WANG, Haili LI, Huiliang XIAO, Lezhu CHEN. Geochemical Characteristics and Geological Significance of the Ore-forming Granite of Indosinian Baishi W-Cu Deposit in Southern Jiangxi Province[J].Gold Science and Technology, 2023, 31(5): 736-751.

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样品编号	SiO₂	Al₂O₃	K₂O	Na₂O	TFe₂O₃	FeO	MgO	TiO₂	CaO	P₂O₅	MnO	LOI	总计
G001-YQ1-1	73.95	13.49	4.37	2.94	1.89	1.54	0.42	0.25	0.54	0.22	0.06	1.33	99.46
G001-YQ1-2	73.67	13.81	4.33	3.00	2.08	1.80	0.46	0.28	0.58	0.23	0.06	1.31	99.81
G003-YQ1-1	70.17	14.93	4.02	2.14	3.77	2.41	0.89	0.58	1.14	0.29	0.09	2.20	100.22
G003-YQ1-2	70.12	14.56	4.18	2.09	3.87	2.37	0.91	0.60	1.07	0.27	0.09	2.25	100.02
G003-H1	71.30	13.78	6.33	0.17	4.55	0.72	0.63	0.50	0.04	0.14	0.02	2.52	99.98
样品编号	A/CNK	A/NK	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er
G001-YQ1-1	1.72	1.85	35.29	72.08	8.52	30.66	5.99	0.54	4.82	0.74	3.98	0.74	2.22
G001-YQ1-2	1.75	1.88	37.66	77.25	9.10	32.70	6.43	0.55	5.16	0.79	4.25	0.80	2.38
G003-YQ1-1	2.04	2.42	73.16	153.84	16.61	59.15	10.79	1.40	8.86	1.26	6.52	1.22	3.59
G003-YQ1-2	1.98	2.32	69.87	145.35	15.85	56.54	10.41	1.36	8.58	1.21	6.41	1.22	3.58
G003-H1	2.11	2.12	68.55	125.64	15.27	53.68	8.89	1.45	6.27	0.75	3.43	0.62	1.87
样品编号	Tm	Yb	Lu	Rb	Ba	Th	U	Nb	Ta	Hf	Zr	Ti	Y
G001-YQ1-1	0.33	2.23	0.33	395.51	217.67	18.93	10.11	21.80	4.22	4.12	134.51	1 539.75	22.82
G001-YQ1-2	0.35	2.34	0.35	392.86	204.14	19.74	8.98	23.74	4.77	4.59	153.49	1 704.61	24.24
G003-YQ1-1	0.50	3.19	0.49	314.28	632.84	34.77	8.78	18.74	1.90	6.08	225.95	3 600.63	35.88
G003-YQ1-2	0.50	3.28	0.49	321.12	638.91	33.50	8.43	19.06	1.92	6.41	239.31	3 689.33	35.80
G003-H1	0.26	1.77	0.28	654.76	1 049.46	25.25	7.21	16.07	1.62	5.49	204.37	3 071.12	18.34
样品编号	V	Cr	Co	Ni	Li	Sr	Be	Sc	Mn	Ga	Pb	Bi	DI
G001-YQ1-1	16.72	5.06	2.46	1.88	109.50	44.18	24，61	4.90	438.31	23.59	26.40	3.73	90.39
G001-YQ1-2	18.02	5.39	2.85	2.00	110.93	43.15	23.39	4.75	456.66	23.55	28.52	5.32	90.05
G003-YQ1-1	49.38	12.60	9.63	5.82	124.63	150.98	11.17	8.33	692.34	25.01	43.44	1.55	82.04
G003-YQ1-2	51.14	11.70	9.37	5.30	128.11	148.56	10.40	8.35	677.34	24.35	42.55	1.23	81.53
G003-H1	40.25	10.40	1.01	0.74	274.32	156.58	12.45	7.69	209.23	23.50	905.26	3.54	83.55

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Geochemical Characteristics and Geological Significance of the Ore-forming Granite of Indosinian Baishi W-Cu Deposit in Southern Jiangxi Province

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