Zircon U-Pb Geochronology, Hf isotope and Whole-Rock Geochemical Characteristics of Xiaohanshan Pluton in Haobugao Pb-Zn Deposit, Inner Mongolia

doi:10.19657/j.geoscience.1000-8527.2021.046

Abstract

Abstract:

The Haobugao lead-zinc deposit is tectonically located in the southern part of the Great Xing’an Range, and is part of the Huanggangliang-Ganzhuermiao tectono-metallogenic belt. In this paper, detailed data on petrology, U-Pb geochronology, geochemistry and Hf isotopes were presented on the Xiaohanshan pluton of the Haobugao lead-zinc deposit. The results show that the main rock type of the Xiaohanshan pluton is monzogranite, which was formed in the Early Cretaceous (143.9±1.1 Ma). The rocks have high SiO₂ (66.96%-68.05%) and alkali (Na₂O+K₂O=9.91%-10.09%), but low Al₂O₃ (15.69%-16.49%), CaO (1.22%-1.41%), and TFe₂O₃/MgO (average 8.29). The rocks belong to metaluminous to peraluminous granites with right-inclining REE distribution patterns and distinct negative Eu anomalies (0.33-0.41). The samples also show enrichments in large ion lithophilic elements (LILEs, e.g., Rb, K) and other incompatible elements (e.g., Th, U), whereas high field strength elements (HFSEs, e.g., Nb, P, Nb, Ta, Ti) are depleted, showing A2-type granite affinity. The rocks have initial ¹⁷⁶Hf/¹⁷⁷Hf values of 0.282,829-0.282,936(average 0.282,888) and ε_Hf(t) of 4.4 to 8.4 (average 6.7), indicating that the Xiaohanshan pluton is mainly derived from partial melting of the middle and lower crust with minor mantle material input. It is considered that formation of the Xiaohanshan pluton was related to the post-collision extensional tectonics in the Early Cretaceous Paleo-Pacific subduction continental margin.

Key words: geochemistry, zircon U-Pb dating, Early Cretaceous, Xiaohanshan pluton, Haobugao lead-zinc deposit

CLC Number:

ZHU Tong, SUN Zhenjun, YU Henan, WANG Chengyang, LIU Guanghu. Zircon U-Pb Geochronology, Hf isotope and Whole-Rock Geochemical Characteristics of Xiaohanshan Pluton in Haobugao Pb-Zn Deposit, Inner Mongolia[J]. Geoscience, 2022, 36(01): 282-294.

Figures/Tables 13

References 82

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分析点号	含量/10^-6		Th/U	同位素比值				年龄/Ma
分析点号	Th	U	Th/U	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
XHS-02-03	26	68	0.39	0.153 36	0.015 17	0.022 59	0.000 66	144.9	13.4	144.0	4.2
XHS-02-04	989	1167	0.85	0.156 51	0.004 92	0.022 40	0.000 41	147.6	4.3	142.8	2.6
XHS-02-05	165	466	0.35	0.148 07	0.005 50	0.022 35	0.000 41	140.2	4.9	142.5	2.6
XHS-02-06	651	777	0.84	0.155 88	0.004 10	0.022 33	0.000 39	147.1	3.6	142.3	2.5
XHS-02-07	117	324	0.36	0.156 13	0.004 63	0.022 56	0.000 36	147.3	4.1	143.8	2.3
XHS-02-08	202	534	0.38	0.155 15	0.004 59	0.022 48	0.000 39	146.4	4.0	143.3	2.5
XHS-02-09	719	650	1.11	0.156 90	0.005 63	0.022 79	0.000 41	148.0	4.9	145.2	2.6
XHS-02-10	154	450	0.34	0.151 25	0.004 65	0.022 48	0.000 41	143.0	4.1	143.3	2.6
XHS-02-11	212	297	0.71	0.148 68	0.007 04	0.022 47	0.000 44	140.7	6.2	143.2	2.7
XHS-02-12	263	643	0.41	0.154 01	0.004 71	0.022 72	0.000 44	145.4	4.1	144.8	2.8
XHS-02-13	189	426	0.44	0.153 81	0.005 38	0.022 72	0.000 40	145.3	4.7	144.8	2.5
XHS-02-14	82	118	0.70	0.147 22	0.007 13	0.022 61	0.000 47	139.5	6.3	144.1	3.0
XHS-02-15	164	506	0.32	0.151 08	0.005 37	0.022 64	0.000 35	142.9	4.7	144.3	2.2
XHS-02-16	176	490	0.36	0.153 86	0.007 54	0.022 71	0.000 52	145.3	6.6	144.7	3.3
XHS-02-17	188	501	0.37	0.154 01	0.006 00	0.022 68	0.000 49	145.4	5.3	144.6	3.1
XHS-02-18	108	341	0.32	0.153 60	0.007 03	0.022 78	0.000 41	145.1	6.2	145.2	2.6
XHS-02-20	421	798	0.53	0.155 54	0.003 54	0.022 58	0.000 36	146.8	3.1	144.0	2.3
XHS-02-21	148	157	0.95	0.152 18	0.010 33	0.022 44	0.000 43	143.8	9.1	143.1	2.7
XHS-02-22	148	436	0.34	0.155 08	0.006 60	0.022 64	0.000 45	146.4	5.8	144.3	2.8
XHS-02-24	269	458	0.59	0.155 02	0.004 63	0.022 51	0.000 35	146.3	4.1	143.5	2.2

分析点号	含量/10^-6		Th/U	同位素比值				年龄/Ma
分析点号	Th	U	Th/U	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
XHS-02-03	26	68	0.39	0.153 36	0.015 17	0.022 59	0.000 66	144.9	13.4	144.0	4.2
XHS-02-04	989	1167	0.85	0.156 51	0.004 92	0.022 40	0.000 41	147.6	4.3	142.8	2.6
XHS-02-05	165	466	0.35	0.148 07	0.005 50	0.022 35	0.000 41	140.2	4.9	142.5	2.6
XHS-02-06	651	777	0.84	0.155 88	0.004 10	0.022 33	0.000 39	147.1	3.6	142.3	2.5
XHS-02-07	117	324	0.36	0.156 13	0.004 63	0.022 56	0.000 36	147.3	4.1	143.8	2.3
XHS-02-08	202	534	0.38	0.155 15	0.004 59	0.022 48	0.000 39	146.4	4.0	143.3	2.5
XHS-02-09	719	650	1.11	0.156 90	0.005 63	0.022 79	0.000 41	148.0	4.9	145.2	2.6
XHS-02-10	154	450	0.34	0.151 25	0.004 65	0.022 48	0.000 41	143.0	4.1	143.3	2.6
XHS-02-11	212	297	0.71	0.148 68	0.007 04	0.022 47	0.000 44	140.7	6.2	143.2	2.7
XHS-02-12	263	643	0.41	0.154 01	0.004 71	0.022 72	0.000 44	145.4	4.1	144.8	2.8
XHS-02-13	189	426	0.44	0.153 81	0.005 38	0.022 72	0.000 40	145.3	4.7	144.8	2.5
XHS-02-14	82	118	0.70	0.147 22	0.007 13	0.022 61	0.000 47	139.5	6.3	144.1	3.0
XHS-02-15	164	506	0.32	0.151 08	0.005 37	0.022 64	0.000 35	142.9	4.7	144.3	2.2
XHS-02-16	176	490	0.36	0.153 86	0.007 54	0.022 71	0.000 52	145.3	6.6	144.7	3.3
XHS-02-17	188	501	0.37	0.154 01	0.006 00	0.022 68	0.000 49	145.4	5.3	144.6	3.1
XHS-02-18	108	341	0.32	0.153 60	0.007 03	0.022 78	0.000 41	145.1	6.2	145.2	2.6
XHS-02-20	421	798	0.53	0.155 54	0.003 54	0.022 58	0.000 36	146.8	3.1	144.0	2.3
XHS-02-21	148	157	0.95	0.152 18	0.010 33	0.022 44	0.000 43	143.8	9.1	143.1	2.7
XHS-02-22	148	436	0.34	0.155 08	0.006 60	0.022 64	0.000 45	146.4	5.8	144.3	2.8
XHS-02-24	269	458	0.59	0.155 02	0.004 63	0.022 51	0.000 35	146.3	4.1	143.5	2.2

样品号	SiO₂	Al₂O₃	TFe₂O₃	MgO	CaO	Na₂O	K₂O	MnO	TiO₂	P₂O₅	烧失量	总量
XHS-1	67.42	15.87	3.11	0.38	1.36	4.71	5.38	0.07	0.36	0.10	0.62	98.99
XHS-2	67.12	15.69	3.31	0.41	1.22	4.64	5.30	0.08	0.38	0.10	0.95	98.78
XHS-3	67.20	15.86	3.46	0.42	1.41	4.65	5.37	0.08	0.39	0.10	0.63	99.16
XHS-4	68.05	16.49	3.31	0.39	1.32	4.64	5.32	0.07	0.38	0.11	0.62	100.30
XHS-5	66.97	15.71	3.31	0.39	1.39	4.72	5.20	0.08	0.38	0.11	1.07	98.93
样品号	Sc	V	Co	Ni	Zn	Ga	Rb	Sr	Zr	Nb	Cs	Ba
XHS-1	7.62	14.18	1.92	6.72	61.94	22.12	110.98	139.42	439.91	9.06	5.98	779.80
XHS-2	8.13	16.43	3.22	37.37	111.11	23.41	121.61	139.72	452.24	10.26	6.91	733.44
XHS-3	8.47	17.33	2.65	9.55	85.91	22.63	110.99	135.20	451.93	9.66	7.89	811.02
XHS-4	7.99	16.24	2.78	12.97	94.63	23.84	110.94	152.48	468.80	9.80	6.01	810.71
XHS-5	7.68	16.44	2.37	7.16	79.53	22.41	105.54	141.22	452.39	9.56	5.68	736.50
样品号	Hf	Ta	Pb	Th	U	Y	La	Ce	Pr	Nd	Sm	Eu
XHS-1	9.78	0.75	16.19	10.07	2.17	27.22	54.90	113.38	11.89	43.39	7.20	0.85
XHS-2	10.03	0.83	21.86	10.99	2.79	29.92	58.34	122.85	12.85	46.04	7.55	0.80
XHS-3	10.05	0.77	18.13	11.16	2.25	29.09	57.11	116.25	12.55	46.42	8.16	0.92
XHS-4	10.18	0.78	19.71	9.69	2.38	28.64	48.84	100.66	11.23	41.11	7.25	0.93
XHS-5	10.02	0.77	16.30	9.88	2.60	27.73	49.09	102.75	11.26	40.98	7.06	0.82
样品号	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	REE	δEu	(La/Yb)_N	(Ce/Yb)_N
XHS-1	0.30	0.96	5.31	1.05	3.08	0.44	3.02	0.44	252.55	0.38	13.03	10.42
XHS-2	0.60	1.05	5.72	1.15	3.40	0.47	3.20	0.48	271.00	0.33	13.08	10.66
XHS-3	0.30	1.07	5.89	1.16	3.28	0.46	3.17	0.47	264.09	0.37	12.91	10.18
XHS-4	0.30	1.01	5.52	1.13	3.23	0.45	3.10	0.46	231.45	0.41	11.32	9.03
XHS-5	0.21	0.96	5.32	1.06	3.04	0.43	3.01	0.45	232.63	0.37	11.70	9.48

样品号	SiO₂	Al₂O₃	TFe₂O₃	MgO	CaO	Na₂O	K₂O	MnO	TiO₂	P₂O₅	烧失量	总量
XHS-1	67.42	15.87	3.11	0.38	1.36	4.71	5.38	0.07	0.36	0.10	0.62	98.99
XHS-2	67.12	15.69	3.31	0.41	1.22	4.64	5.30	0.08	0.38	0.10	0.95	98.78
XHS-3	67.20	15.86	3.46	0.42	1.41	4.65	5.37	0.08	0.39	0.10	0.63	99.16
XHS-4	68.05	16.49	3.31	0.39	1.32	4.64	5.32	0.07	0.38	0.11	0.62	100.30
XHS-5	66.97	15.71	3.31	0.39	1.39	4.72	5.20	0.08	0.38	0.11	1.07	98.93
样品号	Sc	V	Co	Ni	Zn	Ga	Rb	Sr	Zr	Nb	Cs	Ba
XHS-1	7.62	14.18	1.92	6.72	61.94	22.12	110.98	139.42	439.91	9.06	5.98	779.80
XHS-2	8.13	16.43	3.22	37.37	111.11	23.41	121.61	139.72	452.24	10.26	6.91	733.44
XHS-3	8.47	17.33	2.65	9.55	85.91	22.63	110.99	135.20	451.93	9.66	7.89	811.02
XHS-4	7.99	16.24	2.78	12.97	94.63	23.84	110.94	152.48	468.80	9.80	6.01	810.71
XHS-5	7.68	16.44	2.37	7.16	79.53	22.41	105.54	141.22	452.39	9.56	5.68	736.50
样品号	Hf	Ta	Pb	Th	U	Y	La	Ce	Pr	Nd	Sm	Eu
XHS-1	9.78	0.75	16.19	10.07	2.17	27.22	54.90	113.38	11.89	43.39	7.20	0.85
XHS-2	10.03	0.83	21.86	10.99	2.79	29.92	58.34	122.85	12.85	46.04	7.55	0.80
XHS-3	10.05	0.77	18.13	11.16	2.25	29.09	57.11	116.25	12.55	46.42	8.16	0.92
XHS-4	10.18	0.78	19.71	9.69	2.38	28.64	48.84	100.66	11.23	41.11	7.25	0.93
XHS-5	10.02	0.77	16.30	9.88	2.60	27.73	49.09	102.75	11.26	40.98	7.06	0.82
样品号	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	REE	δEu	(La/Yb)_N	(Ce/Yb)_N
XHS-1	0.30	0.96	5.31	1.05	3.08	0.44	3.02	0.44	252.55	0.38	13.03	10.42
XHS-2	0.60	1.05	5.72	1.15	3.40	0.47	3.20	0.48	271.00	0.33	13.08	10.66
XHS-3	0.30	1.07	5.89	1.16	3.28	0.46	3.17	0.47	264.09	0.37	12.91	10.18
XHS-4	0.30	1.01	5.52	1.13	3.23	0.45	3.10	0.46	231.45	0.41	11.32	9.03
XHS-5	0.21	0.96	5.32	1.06	3.04	0.43	3.01	0.45	232.63	0.37	11.70	9.48

点号	t/Ma	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	1σ	ε_Hf(t)	T_DM1/Ma	T_DM2/Ma
XHS-02-03	144.0	0.001 562	0.060 470	0.282 897	0.000 019	7.02	510.45	723.57
XHS-02-04	142.8	0.002 278	0.090 737	0.282 882	0.000 016	6.40	542.38	762.29
XHS-02-05	142.5	0.001 236	0.047 621	0.282 894	0.000 017	6.90	510.89	730.21
XHS-02-06	142.3	0.001 776	0.067 297	0.282 829	0.000 019	4.54	612.77	881.02
XHS-02-07	143.8	0.002 251	0.088 018	0.282 861	0.000 021	5.68	572.94	809.34
XHS-02-08	143.3	0.002 070	0.085 905	0.282 923	0.000 021	7.88	479.62	668.22
XHS-02-10	143.3	0.001 053	0.040 029	0.282 870	0.000 017	6.09	542.17	782.46
XHS-02-11	143.2	0.002 322	0.089 539	0.282 889	0.000 021	6.63	533.63	747.85
XHS-02-14	144.1	0.000 649	0.023 870	0.282 884	0.000 017	6.63	517.26	748.71
XHS-02-15	144.3	0.000 978	0.034 827	0.282 916	0.000 020	7.76	475.49	676.66
XHS-02-17	144.6	0.000 989	0.039 083	0.282 874	0.000 015	6.28	534.95	771.27
XHS-02-20	144	0.001 411	0.055 054	0.282 870	0.000 017	6.09	546.86	783.39
XHS-02-21	143.1	0.001 360	0.052 966	0.282 936	0.000 019	8.40	451.72	634.36
XHS-02-22	144.3	0.002 057	0.083 746	0.282 892	0.000 018	6.80	524.89	738.10
XHS-02-24	143.5	0.001 578	0.060 935	0.282 914	0.000 016	7.58	487.24	687.12