In-situ Monazite U-Pb Geochronology of Highly Fractionated Granites in Shamai Tungsten Deposit, Inner Mongolia and Its Mineralization Significance

doi:10.19657/j.geoscience.1000-8527.2020.015

Abstract

Abstract:

The Xing’an-Mongolia Orogenic Belt (XMOB) is an important metallogenic belt in northern China, hosting a series of tungsten polymetallic deposits. The Shamai tungsten deposit, located in the eastern part of the Erenhot-Dongwuqi metallogenic belt in the XMOB, is a typical quartz-vein hosted tungsten deposit. In this paper, in-situ LA-ICP-MS monazite U-Pb dating was used to determine the ages of the ore-bearing granites at Shamai, and the metallogenic epoch and geodynamic background of the regional tungsten mineralization were discussed. The monazite from the medium-grained biotite monzogranite and porphyritic biotite monzogranite, yield concordant ages of (141.6±1.1) Ma and (141.4±0.3) Ma, respectively, reflecting their crystallization ages. Tungsten mineralization in the Erenhot-Dongwuqi metallogenic belt occurred in two stages at ca. 300 Ma and ca. 140-130 Ma. The former stage was likely related to the subduction of the Paleo-Asian ocean, while the latter stage was likely co-influenced by the (post)-subduction tectonics of the Mongol-Okhotsk Ocean and the Paleo-Pacific Ocean.

Key words: Shamai Tungsten deposit, highly fractionated granite, in-situ monazite U-Pb age, Erenhot-Dongwuqi metallogenic belt

CLC Number:

MI Kuifeng, YANG Yan, YAN Tingjie, LÜ Zhicheng, LIU Zhenjiang. In-situ Monazite U-Pb Geochronology of Highly Fractionated Granites in Shamai Tungsten Deposit, Inner Mongolia and Its Mineralization Significance[J]. Geoscience, 2020, 34(03): 504-513.

Figures/Tables 7

References 34

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点号	Th/10^-6	U/10^-6	Th/U	同位素比值				年龄/Ma
点号	Th/10^-6	U/10^-6	Th/U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ		²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ
SM-1-01	38 875	1 284	30.28	0.049 58±0.003 42	0.149 26±0.008 97	0.022 16±0.000 35	141.3±7.9		141.3±2.2
SM-1-02	49 852	1 596	31.24	0.047 02±0.004 63	0.149 74±0.012 51	0.022 15±0.000 63	141.7±11.0		141.2±4.0
SM-1-04	45 451	1 527	29.76	0.049 50±0.003 43	0.149 42±0.009 68	0.022 23±0.000 72	141.4±8.6		141.7±4.6
SM-1-05	52 871	1 683	31.41	0.048 87±0.006 10	0.149 01±0.018 59	0.022 04±0.000 58	141±16.4		140.6±3.7
SM-1-06	50 085	1 405	35.65	0.049 61±0.002 87	0.150 03±0.008 29	0.022 20±0.000 29	141.9±7.3		141.5±1.8
SM-1-07	46 587	1 211	38.48	0.050 96±0.007 64	0.150 82±0.017 02	0.022 32±0.000 85	142.6±15		142.3±5.3
SM-1-08	40 180	1 281	31.36	0.048 83±0.003 57	0.149 29±0.010 27	0.022 21±0.000 40	141.3±9.1		141.6±2.5
SM-1-09	50 242	1 640	30.64	0.049 08±0.002 57	0.149 63±0.007 28	0.022 19±0.000 28	141.6±6.4		141.5±1.7
SM-1-10	43 104	1 225	35.18	0.050 47±0.002 96	0.149 68±0.007 89	0.022 21±0.000 39	141.6±7.0		141.6±2.4
SM-1-11	39 049	1 307	29.87	0.049 06±0.004 91	0.149 44±0.014 39	0.022 17±0.000 34	141.4±12.7		141.4±2.2
SM-1-12	51 970	1 722	30.19	0.048 16±0.006 19	0.151 67±0.022 63	0.022 20±0.000 75	143.4±20.0		141.5±4.7
SM-1-13	49 995	1 456	34.35	0.049 80±0.003 89	0.149 60±0.010 31	0.022 26±0.000 43	141.6±9.1		141.9±2.7
SM-1-14	49 316	1 270	38.83	0.049 91±0.004 15	0.150 60±0.011 48	0.022 26±0.000 57	142.4±10.1		141.9±3.6
SM-1-15	47 734	1 417	33.69	0.049 04±0.003 36	0.150 22±0.009 92	0.022 32±0.000 37	142.1±8.8		142.3±2.3
SM-1-16	50 141	1 526	32.87	0.049 48±0.003 70	0.149 43±0.010 47	0.022 21±0.000 39	141.4±9.2		141.6±2.4
SM-1-17	48 040	1 230	39.07	0.050 06±0.004 60	0.149 66±0.011 66	0.022 23±0.000 57	141.6±10.3		141.7±3.6
SM-1-19	44 354	1 223	36.28	0.049 41±0.003 14	0.150 04±0.009 39	0.022 18±0.000 39	141.9±8.3		141.4±2.4
SM-1-20	54 940	1 585	34.65	0.049 17±0.003 44	0.148 19±0.010 03	0.022 01±0.000 50	140.3±8.9		140.3±3.2
SM-1-21	51 775	1 374	37.69	0.049 32±0.003 24	0.149 58±0.009 49	0.022 21±0.000 39	141.5±8.4		141.6±2.5
SM-1-24	36 670	982	37.33	0.049 77±0.003 94	0.149 37±0.010 86	0.022 17±0.000 38	141.4±9.6		141.3±2.4
SM-1-25	26 971	999	26.99	0.058 37±0.007 87	0.150 24±0.012 21	0.022 23±0.000 55	142.1±10.8		141.7±3.5
SM-1-26	49 633	1 436	34.56	0.048 95±0.003 52	0.149 76±0.010 00	0.022 23±0.000 41	141.7±8.8		141.7±2.6
SM-1-27	36 972	1 143	32.34	0.049 31±0.003 99	0.148 64±0.010 84	0.022 21±0.000 59	140.7±9.6		141.6±3.7
点号	Th/10^-6	U/10^-6	Th/U	同位素比值				年龄/Ma
点号	Th/10^-6	U/10^-6	Th/U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ		²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ
SM-1-28	44 778	1 292	34.66	0.048 58±0.007 47	0.150 17±0.023 12	0.022 26±0.000 72	142.1±20.4		141.9±4.6
SM-1-29	43 576	1 493	29.19	0.048 83±0.003 71	0.149 40±0.011 29	0.022 29±0.000 52	141.4±10		142.1±3.3
SM-1-30	40 771	1 354	30.1	0.048 62±0.009 26	0.149 41±0.018 18	0.022 24±0.000 64	141.4±16.1		141.8±4.0
SM-2-01	60 379	6 902	8.75	0.048 81±0.001 87	0.149 29±0.005 51	0.022 18±0.000 24	141.3±4.9		141.4±1.5
SM-2-02	21 846	2 044	10.69	0.048 69±0.005 09	0.145 75±0.014 78	0.021 83±0.000 65	138.2±13.1		139.2±4.1
SM-2-03	68 788	1 826	37.67	0.049 48±0.003 17	0.149 45±0.008 91	0.022 19±0.000 37	141.4±7.9		141.5±2.4
SM-2-04	75 186	5 498	13.67	0.049 15±0.003 16	0.150 31±0.009 29	0.022 24±0.000 44	142.2±8.2		141.8±2.8
SM-2-05	75 603	5 745	13.16	0.049 17±0.002 03	0.150 78±0.006 11	0.022 18±0.000 25	142.6±5.4		141.4±1.6
SM-2-07	15 070	2 263	6.66	0.049 79±0.004 26	0.148 46±0.010 94	0.022 23±0.000 41	140.6±9.7		141.7±2.6
SM-2-08	61 056	4 595	13.29	0.048 29±0.003 19	0.148 85±0.010 86	0.022 21±0.000 56	140.9±9.6		141.6±3.5
SM-2-09	97 227	6 255	15.54	0.048 95±0.002 34	0.149 73±0.006 80	0.022 19±0.000 31	141.7±6.0		141.5±1.9
SM-2-10	87 135	5 384	16.18	0.048 40±0.001 88	0.149 52±0.006 03	0.022 23±0.000 22	141.5±5.3		141.7±1.4
SM-2-11	78 512	2 266	34.65	0.049 33±0.002 59	0.149 80±0.007 52	0.022 11±0.000 27	141.7±6.6		141.0±1.7
SM-2-12	57 440	1 587	36.2	0.048 90±0.003 53	0.149 93±0.010 86	0.022 12±0.000 35	141.9±9.6		141.0±2.2
SM-2-13	67 804	5 848	11.59	0.048 87±0.002 81	0.149 19±0.008 02	0.022 18±0.000 38	141.2±7.1		141.4±2.4
SM-2-14	95 595	6 041	15.82	0.048 77±0.002 25	0.149 76±0.006 93	0.022 21±0.000 31	141.7±6.1		141.6±1.9
SM-2-15	75 492	4 604	16.4	0.048 84±0.003 45	0.149 86±0.010 22	0.022 26±0.000 33	141.8±9.0		141.9±2.1
SM-2-16	75 928	5 769	13.16	0.048 98±0.003 27	0.149 41±0.009 46	0.022 29±0.000 36	141.4±8.4		142.1±2.3
SM-2-17	51 255	3 696	13.87	0.049 37±0.002 32	0.150 64±0.006 98	0.022 20±0.000 34	142.5±6.2		141.5±2.1
SM-2-18	60 796	1 837	33.09	0.049 23±0.003 29	0.147 96±0.009 03	0.021 98±0.000 30	140.1±8.0		140.2±1.9
SM-2-19	67 252	5 045	13.33	0.048 96±0.001 65	0.149 90±0.004 98	0.022 22±0.000 23	141.8±4.4		141.7±1.4
SM-2-20	64 388	2 134	30.17	0.048 61±0.003 17	0.148 74±0.010 21	0.022 20±0.000 38	140.8±9.0		141.5±2.4
SM-2-21	74 313	2 199	33.79	0.049 11±0.002 45	0.149 59±0.007 12	0.022 22±0.000 34	141.6±6.3		141.7±2.2
SM-2-22	70 560	2 264	31.16	0.049 23±0.005 13	0.148 84±0.015 32	0.022 18±0.000 57	140.9±13.5		141.4±3.6
SM-2-24	76 726	5 552	13.82	0.049 01±0.002 35	0.150 63±0.007 02	0.022 40±0.000 41	142.5±6.2		142.8±2.6
SM-2-25	72 126	2 548	28.3	0.049 45±0.002 04	0.149 76±0.005 86	0.022 19±0.000 35	141.7±5.2		141.5±2.2
SM-2-26	63 997	4 302	14.88	0.049 06±0.004 11	0.148 88±0.011 22	0.022 19±0.000 61	140.9±9.9		141.5±3.9
SM-2-27	73 802	4 882	15.12	0.048 91±0.002 53	0.150 53±0.008 35	0.022 19±0.000 43	142.4±7.4		141.5±2.7
SM-2-28	16 527	2 624	6.3	0.048 34±0.003 68	0.147 53±0.011 36	0.022 08±0.000 51	139.7±10.1		140.8±3.2
SM-2-29	63 472	6 003	10.57	0.048 84±0.002 33	0.149 32±0.006 73	0.022 17±0.000 34	141.3±5.9		141.3±2.1
SM-2-30	93 885	5 349	17.55	0.048 54±0.003 88	0.149 88±0.013 97	0.022 11±0.000 50	141.8±12.3		141.0±3.2

点号	Th/10^-6	U/10^-6	Th/U	同位素比值				年龄/Ma
点号	Th/10^-6	U/10^-6	Th/U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ		²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ
SM-1-01	38 875	1 284	30.28	0.049 58±0.003 42	0.149 26±0.008 97	0.022 16±0.000 35	141.3±7.9		141.3±2.2
SM-1-02	49 852	1 596	31.24	0.047 02±0.004 63	0.149 74±0.012 51	0.022 15±0.000 63	141.7±11.0		141.2±4.0
SM-1-04	45 451	1 527	29.76	0.049 50±0.003 43	0.149 42±0.009 68	0.022 23±0.000 72	141.4±8.6		141.7±4.6
SM-1-05	52 871	1 683	31.41	0.048 87±0.006 10	0.149 01±0.018 59	0.022 04±0.000 58	141±16.4		140.6±3.7
SM-1-06	50 085	1 405	35.65	0.049 61±0.002 87	0.150 03±0.008 29	0.022 20±0.000 29	141.9±7.3		141.5±1.8
SM-1-07	46 587	1 211	38.48	0.050 96±0.007 64	0.150 82±0.017 02	0.022 32±0.000 85	142.6±15		142.3±5.3
SM-1-08	40 180	1 281	31.36	0.048 83±0.003 57	0.149 29±0.010 27	0.022 21±0.000 40	141.3±9.1		141.6±2.5
SM-1-09	50 242	1 640	30.64	0.049 08±0.002 57	0.149 63±0.007 28	0.022 19±0.000 28	141.6±6.4		141.5±1.7
SM-1-10	43 104	1 225	35.18	0.050 47±0.002 96	0.149 68±0.007 89	0.022 21±0.000 39	141.6±7.0		141.6±2.4
SM-1-11	39 049	1 307	29.87	0.049 06±0.004 91	0.149 44±0.014 39	0.022 17±0.000 34	141.4±12.7		141.4±2.2
SM-1-12	51 970	1 722	30.19	0.048 16±0.006 19	0.151 67±0.022 63	0.022 20±0.000 75	143.4±20.0		141.5±4.7
SM-1-13	49 995	1 456	34.35	0.049 80±0.003 89	0.149 60±0.010 31	0.022 26±0.000 43	141.6±9.1		141.9±2.7
SM-1-14	49 316	1 270	38.83	0.049 91±0.004 15	0.150 60±0.011 48	0.022 26±0.000 57	142.4±10.1		141.9±3.6
SM-1-15	47 734	1 417	33.69	0.049 04±0.003 36	0.150 22±0.009 92	0.022 32±0.000 37	142.1±8.8		142.3±2.3
SM-1-16	50 141	1 526	32.87	0.049 48±0.003 70	0.149 43±0.010 47	0.022 21±0.000 39	141.4±9.2		141.6±2.4
SM-1-17	48 040	1 230	39.07	0.050 06±0.004 60	0.149 66±0.011 66	0.022 23±0.000 57	141.6±10.3		141.7±3.6
SM-1-19	44 354	1 223	36.28	0.049 41±0.003 14	0.150 04±0.009 39	0.022 18±0.000 39	141.9±8.3		141.4±2.4
SM-1-20	54 940	1 585	34.65	0.049 17±0.003 44	0.148 19±0.010 03	0.022 01±0.000 50	140.3±8.9		140.3±3.2
SM-1-21	51 775	1 374	37.69	0.049 32±0.003 24	0.149 58±0.009 49	0.022 21±0.000 39	141.5±8.4		141.6±2.5
SM-1-24	36 670	982	37.33	0.049 77±0.003 94	0.149 37±0.010 86	0.022 17±0.000 38	141.4±9.6		141.3±2.4
SM-1-25	26 971	999	26.99	0.058 37±0.007 87	0.150 24±0.012 21	0.022 23±0.000 55	142.1±10.8		141.7±3.5
SM-1-26	49 633	1 436	34.56	0.048 95±0.003 52	0.149 76±0.010 00	0.022 23±0.000 41	141.7±8.8		141.7±2.6
SM-1-27	36 972	1 143	32.34	0.049 31±0.003 99	0.148 64±0.010 84	0.022 21±0.000 59	140.7±9.6		141.6±3.7
点号	Th/10^-6	U/10^-6	Th/U	同位素比值				年龄/Ma
点号	Th/10^-6	U/10^-6	Th/U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ		²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ
SM-1-28	44 778	1 292	34.66	0.048 58±0.007 47	0.150 17±0.023 12	0.022 26±0.000 72	142.1±20.4		141.9±4.6
SM-1-29	43 576	1 493	29.19	0.048 83±0.003 71	0.149 40±0.011 29	0.022 29±0.000 52	141.4±10		142.1±3.3
SM-1-30	40 771	1 354	30.1	0.048 62±0.009 26	0.149 41±0.018 18	0.022 24±0.000 64	141.4±16.1		141.8±4.0
SM-2-01	60 379	6 902	8.75	0.048 81±0.001 87	0.149 29±0.005 51	0.022 18±0.000 24	141.3±4.9		141.4±1.5
SM-2-02	21 846	2 044	10.69	0.048 69±0.005 09	0.145 75±0.014 78	0.021 83±0.000 65	138.2±13.1		139.2±4.1
SM-2-03	68 788	1 826	37.67	0.049 48±0.003 17	0.149 45±0.008 91	0.022 19±0.000 37	141.4±7.9		141.5±2.4
SM-2-04	75 186	5 498	13.67	0.049 15±0.003 16	0.150 31±0.009 29	0.022 24±0.000 44	142.2±8.2		141.8±2.8
SM-2-05	75 603	5 745	13.16	0.049 17±0.002 03	0.150 78±0.006 11	0.022 18±0.000 25	142.6±5.4		141.4±1.6
SM-2-07	15 070	2 263	6.66	0.049 79±0.004 26	0.148 46±0.010 94	0.022 23±0.000 41	140.6±9.7		141.7±2.6
SM-2-08	61 056	4 595	13.29	0.048 29±0.003 19	0.148 85±0.010 86	0.022 21±0.000 56	140.9±9.6		141.6±3.5
SM-2-09	97 227	6 255	15.54	0.048 95±0.002 34	0.149 73±0.006 80	0.022 19±0.000 31	141.7±6.0		141.5±1.9
SM-2-10	87 135	5 384	16.18	0.048 40±0.001 88	0.149 52±0.006 03	0.022 23±0.000 22	141.5±5.3		141.7±1.4
SM-2-11	78 512	2 266	34.65	0.049 33±0.002 59	0.149 80±0.007 52	0.022 11±0.000 27	141.7±6.6		141.0±1.7
SM-2-12	57 440	1 587	36.2	0.048 90±0.003 53	0.149 93±0.010 86	0.022 12±0.000 35	141.9±9.6		141.0±2.2
SM-2-13	67 804	5 848	11.59	0.048 87±0.002 81	0.149 19±0.008 02	0.022 18±0.000 38	141.2±7.1		141.4±2.4
SM-2-14	95 595	6 041	15.82	0.048 77±0.002 25	0.149 76±0.006 93	0.022 21±0.000 31	141.7±6.1		141.6±1.9
SM-2-15	75 492	4 604	16.4	0.048 84±0.003 45	0.149 86±0.010 22	0.022 26±0.000 33	141.8±9.0		141.9±2.1
SM-2-16	75 928	5 769	13.16	0.048 98±0.003 27	0.149 41±0.009 46	0.022 29±0.000 36	141.4±8.4		142.1±2.3
SM-2-17	51 255	3 696	13.87	0.049 37±0.002 32	0.150 64±0.006 98	0.022 20±0.000 34	142.5±6.2		141.5±2.1
SM-2-18	60 796	1 837	33.09	0.049 23±0.003 29	0.147 96±0.009 03	0.021 98±0.000 30	140.1±8.0		140.2±1.9
SM-2-19	67 252	5 045	13.33	0.048 96±0.001 65	0.149 90±0.004 98	0.022 22±0.000 23	141.8±4.4		141.7±1.4
SM-2-20	64 388	2 134	30.17	0.048 61±0.003 17	0.148 74±0.010 21	0.022 20±0.000 38	140.8±9.0		141.5±2.4
SM-2-21	74 313	2 199	33.79	0.049 11±0.002 45	0.149 59±0.007 12	0.022 22±0.000 34	141.6±6.3		141.7±2.2
SM-2-22	70 560	2 264	31.16	0.049 23±0.005 13	0.148 84±0.015 32	0.022 18±0.000 57	140.9±13.5		141.4±3.6
SM-2-24	76 726	5 552	13.82	0.049 01±0.002 35	0.150 63±0.007 02	0.022 40±0.000 41	142.5±6.2		142.8±2.6
SM-2-25	72 126	2 548	28.3	0.049 45±0.002 04	0.149 76±0.005 86	0.022 19±0.000 35	141.7±5.2		141.5±2.2
SM-2-26	63 997	4 302	14.88	0.049 06±0.004 11	0.148 88±0.011 22	0.022 19±0.000 61	140.9±9.9		141.5±3.9
SM-2-27	73 802	4 882	15.12	0.048 91±0.002 53	0.150 53±0.008 35	0.022 19±0.000 43	142.4±7.4		141.5±2.7
SM-2-28	16 527	2 624	6.3	0.048 34±0.003 68	0.147 53±0.011 36	0.022 08±0.000 51	139.7±10.1		140.8±3.2
SM-2-29	63 472	6 003	10.57	0.048 84±0.002 33	0.149 32±0.006 73	0.022 17±0.000 34	141.3±5.9		141.3±2.1
SM-2-30	93 885	5 349	17.55	0.048 54±0.003 88	0.149 88±0.013 97	0.022 11±0.000 50	141.8±12.3		141.0±3.2

矿床	矿床类型	测试对象	测试方法	同位素年龄/Ma	数据来源
巴彦都兰	热液型铜钨多金属矿床	二长花岗岩	锆石U-Pb	300	文献[6]
Bayinsukhtu	石英脉型钨矿	花岗斑岩	锆石U-Pb	298.8±1.8	文献[23]
Bayinsukhtu	石英脉型钨矿	黑钨矿	Sm-Nd	303±19	文献[23]
沙麦	石英大脉型钨矿	花岗岩	锆石U-Pb	226.0±1.5	文献[4]
		花岗岩	锆石U-Pb	146±1	文献[7]
		花岗岩	独居石U-Pb	141	本文
		绢云母	⁴⁰Ar-³⁹Ar	140±1	文献[7]
		辉钼矿	Re-Os	137±2	文献[7]
		黑钨矿	Sm-Nd	137.9±1.7	文献[8]
达亚纳	石英大脉型钨矿	黑云母花岗岩	锆石U-Pb	133±3	文献[7]
达亚纳	石英大脉型钨矿	辉钼矿	Re-Os等时线	134±1	文献[7]

矿床	矿床类型	测试对象	测试方法	同位素年龄/Ma	数据来源
巴彦都兰	热液型铜钨多金属矿床	二长花岗岩	锆石U-Pb	300	文献[6]
Bayinsukhtu	石英脉型钨矿	花岗斑岩	锆石U-Pb	298.8±1.8	文献[23]
Bayinsukhtu	石英脉型钨矿	黑钨矿	Sm-Nd	303±19	文献[23]
沙麦	石英大脉型钨矿	花岗岩	锆石U-Pb	226.0±1.5	文献[4]
		花岗岩	锆石U-Pb	146±1	文献[7]
		花岗岩	独居石U-Pb	141	本文
		绢云母	⁴⁰Ar-³⁹Ar	140±1	文献[7]
		辉钼矿	Re-Os	137±2	文献[7]
		黑钨矿	Sm-Nd	137.9±1.7	文献[8]
达亚纳	石英大脉型钨矿	黑云母花岗岩	锆石U-Pb	133±3	文献[7]
达亚纳	石英大脉型钨矿	辉钼矿	Re-Os等时线	134±1	文献[7]