Geochronology, geochemistry and geological characteristics of granites from the Meixian zinc-lead polymetallic deposit in central Fujian Province

doi:10.13745/j.esf.sf.2020.4.11

Abstract

Abstract:

The Meixian lead-zinc deposit in central Fujian Province is one of the important metallogenic regions in the Meso-Cenozoic megatectonic-magmatic belt along the Pacific Ocean. The intrusive rocks associated with metallogenic processes in the area mainly consist of granite-porphyry, porphyritic biotite granite, K-feldspar granite, and biotite-bearing K-feldspar granite. In this study, based on geological investigation, we performed zircon U-Pb dating using LA-ICP-MS to obtained the diagenetic ages of granites from the Meixian ore deposit. The results showed that the ages ranged from 158 to 155 Ma, indicating granite production by Late Jurassic tectonic-magmatic action in the middle Yanshanian Period. The rock specimens were characterized by high silicon, alkali and potassium contents, high aluminum saturation index, iron rich and magnesium poor, enrichment of LILE and HFS, such as Cs, Rb, K, Pb, Th, U, Zr, Hf, etc., depletion of Ba, Sr, P, Ti, and low Ga/Al ratio. These characteristics are consistent with that of crust source, suggesting the highly-differential I-type granites as the rock genetic type. We further show that granites from the Meixian ore field are formed by the subduction and extension of the Paleo-Pacific Plate, and posited in the extensional orogenic stage within the plate. Magmatic hydrothermal activities played a strong role in tectonic magmatic hydrothermal superimposition and transformation for early submarine volcano-eruption and deposition, and are of great significance for mineral elemental enrichments and prediction of ore bodies.

Key words: geochronology, geochemistry, geological characteristics, granites, lead-zinc polymetallic deposits, Meixian, central Fujian Province

CLC Number:

XIAO Xiaoniu, XIAO E, CHEN Zhenning, GONG Bin, JU Weiwei. Geochronology, geochemistry and geological characteristics of granites from the Meixian zinc-lead polymetallic deposit in central Fujian Province[J]. Earth Science Frontiers, 2020, 27(4): 158-171.

Figures/Tables 14

References 51

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点号	Th/U	同位素比值及误差						同位素年龄及误差/Ma
点号	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
FY-01	1.61	0.056 41	0.002 29	0.188 63	0.007 51	0.024 54	0.000 60	175	6	156	4
FY-02	0.80	0.050 01	0.001 41	0.170 94	0.007 27	0.024 65	0.000 61	160	6	157	4
FY-03	1.11	0.047 81	0.002 44	0.162 43	0.008 26	0.024 66	0.000 46	153	7	157	3
FY-04	0.46	0.050 01	0.001 29	0.172 74	0.005 16	0.025 03	0.000 53	162	5	159	3
FY-05	0.61	0.048 97	0.002 07	0.167 64	0.006 59	0.024 85	0.000 59	157	6	158	4
FY-06	0.86	0.051 51	0.002 33	0.179 12	0.007 80	0.025 40	0.000 64	167	7	162	5
FY-07	1.82	0.054 38	0.002 98	0.186 36	0.010 41	0.025 06	0.000 88	174	9	160	6
FY-08	0.52	0.051 10	0.001 27	0.171 36	0.005 11	0.024 23	0.000 50	161	4	154	3
FY-09	0.78	0.051 39	0.001 55	0.177 23	0.005 93	0.024 91	0.000 48	166	5	159	3
FY-10	0.38	0.053 75	0.001 56	0.179 28	0.006 80	0.024 12	0.000 79	167	6	154	5
FY-11	1.00	0.048 97	0.001 69	0.163 77	0.006 23	0.024 18	0.000 55	154	5	154	3
FY-12	0.39	0.051 16	0.001 15	0.172 99	0.004 17	0.024 62	0.000 63	162	4	157	4
FY-13	0.63	0.046 61	0.001 87	0.160 37	0.006 42	0.024 96	0.000 54	151	6	159	3
FY-14	0.99	0.049 18	0.003 81	0.168 84	0.013 41	0.024 90	0.000 74	158	12	159	5
FY-15	1.09	0.050 59	0.001 84	0.181 00	0.007 91	0.025 67	0.000 57	169	7	163	4
FY-16	0.78	0.046 31	0.003 91	0.161 25	0.015 10	0.025 11	0.000 84	152	13	160	5
FY-17	0.97	0.053 08	0.001 36	0.180 15	0.004 36	0.024 58	0.000 54	168	4	157	3
ZT-01	0.63	0.052 25	0.003 82	0.176 05	0.013 76	0.024 47	0.000 58	165	12	156	4
ZT-02	0.77	0.048 17	0.003 33	0.163 42	0.011 07	0.024 74	0.000 55	154	10	158	3
ZT-03	0.82	0.051 78	0.002 52	0.170 80	0.008 48	0.024 01	0.000 54	160	7	153	3
ZT-04	0.39	0.055 08	0.003 73	0.180 64	0.009 24	0.024 27	0.001 05	169	8	155	7
ZT-05	0.52	0.050 28	0.003 82	0.165 95	0.013 10	0.023 97	0.000 62	156	11	153	4
ZT-06	0.66	0.049 27	0.004 66	0.160 11	0.013 25	0.023 92	0.000 89	151	12	152	6

点号	Th/U	同位素比值及误差						同位素年龄及误差/Ma
点号	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
FY-01	1.61	0.056 41	0.002 29	0.188 63	0.007 51	0.024 54	0.000 60	175	6	156	4
FY-02	0.80	0.050 01	0.001 41	0.170 94	0.007 27	0.024 65	0.000 61	160	6	157	4
FY-03	1.11	0.047 81	0.002 44	0.162 43	0.008 26	0.024 66	0.000 46	153	7	157	3
FY-04	0.46	0.050 01	0.001 29	0.172 74	0.005 16	0.025 03	0.000 53	162	5	159	3
FY-05	0.61	0.048 97	0.002 07	0.167 64	0.006 59	0.024 85	0.000 59	157	6	158	4
FY-06	0.86	0.051 51	0.002 33	0.179 12	0.007 80	0.025 40	0.000 64	167	7	162	5
FY-07	1.82	0.054 38	0.002 98	0.186 36	0.010 41	0.025 06	0.000 88	174	9	160	6
FY-08	0.52	0.051 10	0.001 27	0.171 36	0.005 11	0.024 23	0.000 50	161	4	154	3
FY-09	0.78	0.051 39	0.001 55	0.177 23	0.005 93	0.024 91	0.000 48	166	5	159	3
FY-10	0.38	0.053 75	0.001 56	0.179 28	0.006 80	0.024 12	0.000 79	167	6	154	5
FY-11	1.00	0.048 97	0.001 69	0.163 77	0.006 23	0.024 18	0.000 55	154	5	154	3
FY-12	0.39	0.051 16	0.001 15	0.172 99	0.004 17	0.024 62	0.000 63	162	4	157	4
FY-13	0.63	0.046 61	0.001 87	0.160 37	0.006 42	0.024 96	0.000 54	151	6	159	3
FY-14	0.99	0.049 18	0.003 81	0.168 84	0.013 41	0.024 90	0.000 74	158	12	159	5
FY-15	1.09	0.050 59	0.001 84	0.181 00	0.007 91	0.025 67	0.000 57	169	7	163	4
FY-16	0.78	0.046 31	0.003 91	0.161 25	0.015 10	0.025 11	0.000 84	152	13	160	5
FY-17	0.97	0.053 08	0.001 36	0.180 15	0.004 36	0.024 58	0.000 54	168	4	157	3
ZT-01	0.63	0.052 25	0.003 82	0.176 05	0.013 76	0.024 47	0.000 58	165	12	156	4
ZT-02	0.77	0.048 17	0.003 33	0.163 42	0.011 07	0.024 74	0.000 55	154	10	158	3
ZT-03	0.82	0.051 78	0.002 52	0.170 80	0.008 48	0.024 01	0.000 54	160	7	153	3
ZT-04	0.39	0.055 08	0.003 73	0.180 64	0.009 24	0.024 27	0.001 05	169	8	155	7
ZT-05	0.52	0.050 28	0.003 82	0.165 95	0.013 10	0.023 97	0.000 62	156	11	153	4
ZT-06	0.66	0.049 27	0.004 66	0.160 11	0.013 25	0.023 92	0.000 89	151	12	152	6

样品号	岩性	w_B/%													Q	Pl	Or	C	DI	A/ CNK	AR	σ
样品号	岩性	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	LOI	总量	ALK	Q	Pl	Or	C	DI	A/ CNK	AR	σ
ZT-1	黑云母花岗斑岩	74.63	0.12	13.70	1.21	0.02	0.18	0.32	3.12	5.38	0.02	1.10	99.80	8.50	35.52	28.48	33.38	1.50	97.4	1.19	2.60	2.28
ZT-2		73.40	0.20	13.70	1.86	0.06	0.42	0.83	3.08	5.10	0.05	1.02	99.72	8.18	34.34	30.57	31.82	1.17	96.7	1.13	2.47	2.20
GZY-1		74.04	0.14	13.82	1.20	0.09	0.26	0.40	2.80	5.58	0.02	1.16	99.51	8.38	35.90	26.30	34.79	1.69	97.0	1.21	2.30	2.26
XJ-4	花岗斑岩	76.90	0.13	12.31	1.06	0.04	0.21	0.84	2.82	4.84	0.02	0.52	99.69	7.66	40.23	28.20	29.82	0.64	98.3	1.08	2.5	1.73
XJ-5		76.26	0.13	12.66	1.10	0.03	0.19	0.88	2.92	4.88	0.02	0.53	99.60	7.80	38.78	29.33	30.13	0.68	98.2	1.08	2.52	1.83
XJ-6		71.94	0.12	14.31	1.63	0.06	0.35	0.91	3.27	5.45	0.02	1.54	99.60	8.72	30.32	32.89	34.10	0.97	97.3	1.10	2.51	2.63
ZK001-61	钾长花岗岩	76.76	0.16	11.48	0.49	0.15	0.42	1.80	1.76	5.77	0.03	0.99	99.81	7.53	40.88	21.36	35.59	0	97.8	0.92	3.62	1.68
ZK001-63	黑云母钾长花岗岩	74.51	0.22	12.28	2.06	0.19	0.28	0.92	2.55	5.45	0.04	0.59	99.08	8.00	37.25	26.44	33.95	0.42	97.6	1.04	2.26	2.03
ZK001-72	黑云母钾长花岗岩	75.01	0.20	12.00	1.42	0.11	0.30	1.20	2.40	5.58	0.04	0.99	99.25	7.98	37.42	26.20	34.68	0	98.3	0.98	2.14	1.99

样品号	岩性	w_B/%													Q	Pl	Or	C	DI	A/ CNK	AR	σ
样品号	岩性	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	LOI	总量	ALK	Q	Pl	Or	C	DI	A/ CNK	AR	σ
ZT-1	黑云母花岗斑岩	74.63	0.12	13.70	1.21	0.02	0.18	0.32	3.12	5.38	0.02	1.10	99.80	8.50	35.52	28.48	33.38	1.50	97.4	1.19	2.60	2.28
ZT-2		73.40	0.20	13.70	1.86	0.06	0.42	0.83	3.08	5.10	0.05	1.02	99.72	8.18	34.34	30.57	31.82	1.17	96.7	1.13	2.47	2.20
GZY-1		74.04	0.14	13.82	1.20	0.09	0.26	0.40	2.80	5.58	0.02	1.16	99.51	8.38	35.90	26.30	34.79	1.69	97.0	1.21	2.30	2.26
XJ-4	花岗斑岩	76.90	0.13	12.31	1.06	0.04	0.21	0.84	2.82	4.84	0.02	0.52	99.69	7.66	40.23	28.20	29.82	0.64	98.3	1.08	2.5	1.73
XJ-5		76.26	0.13	12.66	1.10	0.03	0.19	0.88	2.92	4.88	0.02	0.53	99.60	7.80	38.78	29.33	30.13	0.68	98.2	1.08	2.52	1.83
XJ-6		71.94	0.12	14.31	1.63	0.06	0.35	0.91	3.27	5.45	0.02	1.54	99.60	8.72	30.32	32.89	34.10	0.97	97.3	1.10	2.51	2.63
ZK001-61	钾长花岗岩	76.76	0.16	11.48	0.49	0.15	0.42	1.80	1.76	5.77	0.03	0.99	99.81	7.53	40.88	21.36	35.59	0	97.8	0.92	3.62	1.68
ZK001-63	黑云母钾长花岗岩	74.51	0.22	12.28	2.06	0.19	0.28	0.92	2.55	5.45	0.04	0.59	99.08	8.00	37.25	26.44	33.95	0.42	97.6	1.04	2.26	2.03
ZK001-72	黑云母钾长花岗岩	75.01	0.20	12.00	1.42	0.11	0.30	1.20	2.40	5.58	0.04	0.99	99.25	7.98	37.42	26.20	34.68	0	98.3	0.98	2.14	1.99

样品号	岩性	w_B/10^-6																	LREE/ HREE	(La/ Yb)_N	(La/ Sm)_N	(Gd/ Yb)_N	δEu	t(Zr)/ ℃
样品号	岩性	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	ΣREE	LREE	HREE	LREE/ HREE	(La/ Yb)_N	(La/ Sm)_N	(Gd/ Yb)_N	δEu	t(Zr)/ ℃
ZT-1	黑云母花岗斑岩	27.93	45.13	5.74	21.30	4.39	0.62	4.00	0.73	4.47	0.89	2.80	0.47	2.88	0.46	121.8	105.1	16.70	6.29	6.54	4.00	1.1	0.5	752.9
ZT-2		25.20	49.92	5.84	21.21	4.13	0.76	3.96	0.71	4.34	0.86	2.74	0.45	2.96	0.48	123.6	107.1	16.50	6.49	5.74	3.80	1.1	0.6	765.7
GZY-1		19.00	41.64	4.94	17.46	3.99	0.67	3.51	0.72	4.22	0.87	2.66	0.44	2.84	0.44	103.4	87.7	15.70	5.59	4.51	3.00	1.0	0.5	747.9
XJ-4	花岗斑岩	28.96	59.06	6.75	22.18	4.63	0.43	4.52	0.90	5.72	1.20	4.17	0.73	4.84	0.76	144.9	122.0	22.84	5.34	4.03	3.90	0.8	0.3	746.6
XJ-5		26.56	55.59	6.38	22.64	4.73	0.42	4.30	0.78	5.07	1.01	3.46	0.61	4.02	0.65	136.2	116.3	19.90	5.85	4.45	3.50	0.9	0.3	747.5
XJ-6		24.26	53.76	6.39	23.54	5.66	0.46	5.41	1.10	7.30	1.44	4.75	0.80	5.50	0.89	141.3	114.1	27.19	4.20	2.97	2.70	0.8	0.3	746.8
ZK001-61	钾长花岗岩	28.38	49.73	5.46	17.45	3.10	0.42	2.85	0.53	3.04	0.71	2.41	0.50	3.68	0.67	118.9	104.5	14.37	7.27	5.21	5.08	0.6	0.4	749.0
ZK001-63	黑云母钾长花岗岩	57.67	98.37	10.48	32.19	5.84	0.50	4.90	0.83	4.83	1.05	3.55	0.68	4.51	0.77	226.2	205.0	21.12	9.71	8.62	6.20	0.9	0.3	777.3
ZK001-72	黑云母钾长花岗岩	34.87	63.03	6.16	18.63	2.78	0.35	3.15	0.44	2.62	0.58	2.10	0.38	3.10	0.57	138.8	125.8	12.94	9.72	7.58	7.90	0.8	0.4	793.2