广西苗儿山铀矿田张家铀矿床成矿时代:沥青铀矿微区原位测定

郭春影; 秦明宽; 徐浩; 任忠宝; 邹明亮; 白芸; 赵宇霆

doi:10.3799/dqkx.2018.227

广西苗儿山铀矿田张家铀矿床成矿时代:沥青铀矿微区原位测定

doi: 10.3799/dqkx.2018.227

郭春影^1,2, ,,
秦明宽^1,2,
徐浩³,
任忠宝³,
邹明亮⁴,
白芸^1,2,
赵宇霆⁵

1.
中核集团核工业北京地质研究院, 北京 100029
2.
中核集团铀资源勘查与评价技术重点实验室, 北京 100029
3.
中国铀业有限公司, 北京 100013
4.
核工业230研究所, 湖南长沙 410007
5.
中国地质大学地球科学与资源学院, 北京 100083

基金项目:

“十三五”国防预先研究项目 3210402

国家自然科学基金项目 41502097

国家自然科学基金项目 41702102

详细信息

作者简介:
郭春影(1982-), 男, 高级工程师, 博士, 主要从事区域成矿学与成矿预测研究

中图分类号: P612;P619.14
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出版历程
- 收稿日期: 2018-06-29
- 刊出日期: 2020-01-15

Age of Zhangjia Uranium Deposit in the Miaoershan Ore Field, Guangxi Autonomous Region, China: In Situ Micro-Determination on Pitchblende

1.
CNNC Beijing Research Institute of Uranium Geology, Beijing 100029, China
2.
CNNC Key Laboratory of Uranium Resource Exploration and Evaluation Technology, Beijing 100029, China
3.
China National Uranium Co. Ltd., Beijing 100013, China
4.
Changsha Uranium Geology Research Institute, CNNC, Changsha 410007, China
5.
School of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China

摘要

摘要: 张家铀矿床是苗儿山铀矿田北部的代表性铀矿床之一，对其开展详细的成矿年代学研究不仅对认识区域铀成矿规律十分重要，也对探讨华南花岗岩型热液铀矿床的成矿大地构造背景及动力学机制具有重要意义.在详细的镜下观察基础上，采用电子探针U-Th-Pb化学法、LA-ICP-MS U-Pb同位素方法对脉状沥青铀矿进行了年代学研究.20个点的U-Th-Pb化学年龄为55.3~81.1 Ma，其中19个点的加权平均年龄为71.4±1.9 Ma.根据稀土元素特征的不同，将34个点的LA-ICP-MS U-Pb同位素年龄分为2组，第一组共15个点，其中13个点的²⁰⁶Pb/²³⁸U加权平均年龄为69.4±4.9 Ma；第二组共19个，其中16个点的²⁰⁶Pb/²³⁸U加权平均年龄为94.1±3.0 Ma.电子探针U-Th-Pb化学法加权平均年龄（71.4±1.9 Ma）与LA-ICP-MS U-Pb同位素法较年轻的一组²⁰⁶Pb/²³⁸U加权平均年龄（69.4±4.9 Ma）一致，代表张家铀矿床的成矿时代，LA-ICP-MS U-Pb同位素法较老的一组²⁰⁶Pb/²³⁸U加权平均年龄（94.1±3.0 Ma）可能是沥青铀矿受后期改造和/或样品剥蚀过程杂质矿物影响而地质意义不明确.晚中生代期间，古太平洋板块向欧亚大陆俯冲可能是控制华南大规模花岗岩型铀矿床形成的动力学机制，包括张家铀矿床在内的华南花岗岩型铀矿床大规模成矿作用可能受80~50 Ma古太平洋板块对亚洲东部的斜向俯冲动力体制的控制.
- 华南 /
- 热液铀矿床 /
- EPMA U-Th-Pb化学年龄 /
- LA-ICP-MS U-Pb定年 /
- 动力学环境 /
- 地质年代学
Abstract: The Zhangjia uranium deposit is one of the representative uranium deposits in the northern Miaoershan uranium orefield. The detailed study of metallogenic ages of the Zhangjia uranium deposit is very important not only to understanding the regularity of uranium mineralization at regional scale of the Miaoershan uranium orefield but also to systematically investigating the tectonic setting and geodynamics of hydrothermal uranium deposits in granitoids in Southern China. Based on detailed microscopic observation,the vein pitchblende was studied by in-situ electron microprobe U-Th-Pb and LA-ICP-MS U-Pb isotopic and rare earth element analysis. Twenty spots electron probe micro-analysis (EPMA) show calculated U-Th-Pb chemical ages ranging from 55.3 Ma to 81.1 Ma. 19 of the 20 ages give a weighted average age at 71.4±1.9 Ma. Based on rare earth elements differences,34 spots LA-ICP-MS U-Pb isotopic ages can be classified into two groups. The 13 U-Pb isotopic data of the first group 15 data give a weighted ²⁰⁶Pb/²³⁸U average age at 69.4±4.9 Ma. The second group includes 19 data spots,16 of which give a weighted ²⁰⁶Pb/²³⁸U average age at 94.1±3.0 Ma. The weighted EPMA U-Th-Pb chemical age 71.4±1.9 Ma is identical to the weighted ²⁰⁶Pb/²³⁸U average age 69.4±4.9 Ma of first group 13 data spots calculated by LA-ICP-MS U-Pb isotopic method. Thus we believe that the Zhangjia uranium deposit was formed at some 70 Ma. The weighted ²⁰⁶Pb/²³⁸U average age 94.1±3.0 Ma of the second group of the LA-ICP-MS U-Pb isotopic data is believed to have no geological significance and was possibly affected by post-formation alteration and/or impurities minerals in the laser ablation process. In late Mesozoic era,the paleo-Pacific plate was subducted to the eastern Eurasia continent,which affected the tectonics,magmatism and metallogenisis of the South China block. The hydrothermal uranium deposits in grantoids of South China,including the Zhangjia uranium deposit,were mostly formed in 50 Ma to 80 Ma which corresponds to the oblique subduction of the paleo-Pacific Plate to the eastern Eurasia Continent.
- South China /
- hydrothermal uranium deposits /
- EPMA U-Th-Pb chemical age /
- LA-ICP-MS U-Pb dating /
- geodynamic background /
- geochronology

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图 1 华南大地构造格架示意

图a据Gao et al.(2017)修改；图b据1:6 000万中国地图，审图号：GS(2019)1651号

Fig. 1. Schematic map of tectonic framework of the South China Block

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图 2 苗儿山地区地质简图及铀矿床分布

1.新元古界；2.古生界；3.白垩系；4.加里东期花岗岩；5.印支期香草坪岩体；6.印支期豆乍山、张家岩体；7.燕山期岩体；8.断层；9.不整合界面；10.铀矿床及名称；11.城镇；12.岩体名称

Fig. 2. Schematic geological map and distribution of uranium deposits of the Miao'ershan area

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图 3 张家铀矿床地质简图

a.张家铀矿平面地质图；b.张家铀矿Ⅰ剖面地质图

Fig. 3. Geological map of the Zhangjia uranium deposit

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图 4 铀矿石特征及矿物组成显微照片

a.铀矿石手标本照片；b.萤石-黄铁矿-沥青铀矿脉(扫描电镜照片)；c.萤石-黄铁矿-沥青铀矿脉(反光镜下照片)；d.萤石-黄铁矿-沥青铀矿脉(反光镜下照片)；

Fig. 4. Handspeciman and microscopic characters of uranium ores

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图 5 张家铀矿床沥青铀矿EPMA U-Th-Pb化学年龄加权平均图

Fig. 5. Weighted EPMA U-Th-Pb chemical ages of pitchblende of the Zhangjia uranium deposit

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图 6 张家铀矿床沥青铀矿ΣREE-(ΣLREE/ΣHREE)_N图解

底图据Mercadier et al.(2011)

Fig. 6. ΣREE vs. (ΣLREE/ΣHREE)_N diagram of pitchblende from the Zhangjia uranium deposit

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图 7 张家铀矿床沥青铀矿稀土元素配分模式与不同类型铀矿床稀土配分模式对比

不同成因类型铀矿床沥青铀矿稀土配分模式据Mercadier et al.(2011)；球粒陨石标准化数据参考Anders and Grevesse(1989)

Fig. 7. Comparison of pitchblende REE modes between the Zhangjia uranium deposit and global uranium deposits

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图 8 张家铀矿床沥青铀矿LA-ICP-MS U-Pb同位素年龄

a.部分绿色数据点加权平均；b.紫色数据点加权平均

Fig. 8. Diagrams showing the LA-ICP-MS U-Pb isotopic ages of pitchblende from the Zhangjia uranium deposit

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图 9 华南花岗岩型铀矿床成矿年龄统计直方图

数据源自表 4

Fig. 9. Diagram showing the age distribution of uranum deposits in granitoids of South China Block

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表 1 张家铀矿床沥青铀矿电子探针成分(%)及U-Th-Pb年龄(Ma)

Table 1. Electron probe micro-analytic compositions (%) coresponding U-Th-Pb ages (Ma) of pitchblende from the Zhangjia uranium deposit

No.	Na₂O	SiO₂	UO₂	K₂O	Al₂O₃	MgO	PbO	CaO	Y₂O₃	ThO₂	P₂O₅	TiO₂	Yb₂O₃	FeO	MnO	Total	年龄
1	0.23	1.45	87.84	0.03	0.10	-	0.84	4.89	-	-	0.04	-	0.01	-	0.01	95.44	72.2±3.0
2	0.19	1.39	88.97	0.07	0.11	-	0.80	4.71	-	-	-	-	0.11	0.15	0.02	96.52	67.9±3.4
3	0.14	1.23	89.37	0.06	0.11	0.05	0.87	5.15	-	-	-	0.02	-	0.07	-	97.07	73.5±3.7
4	0.15	1.43	88.95	0.1	0.13	0.01	0.77	4.66	-	-	-	0.07	0.21	0.06	0.10	96.64	65.4±3.3
5	0.36	1.36	87.63	0.06	0.10	-	0.81	5.09	-	-	-	-	-	-	0.14	95.55	69.8±3.5
6	0.15	1.26	88.31	0.06	0.04	0.01	0.81	4.66	-	-	0.01	-	-	-	0.05	95.36	69.3±3.5
7	0.11	1.34	88.91	0.06	0.07	-	0.86	5.05	-	-	-	-	0.21	0.08	0.12	96.81	73.0±3.7
8	0.13	1.43	88.20	0.03	0.12	0.02	0.88	4.80	-	-	-	-	-	0.06	0.05	95.72	75.3±3.8
9	0.18	1.30	87.66	0.04	0.06	-	0.79	5.17	0.01	-	0.03	-	-	0.10	0.11	95.45	68.0±3.4
10	0.13	1.58	87.77	0.09	0.15	0.05	0.79	4.92	-	-	-	0.06	-	0.05	0.06	95.65	68.0±3.4
11	0.18	1.35	88.64	0.08	0.08	0.01	0.89	4.67	-	-	-	0.15	0.23	0.08	0.10	96.46	75.8±3.8
12	0.14	1.37	89.52	0.07	0.14	0.02	0.81	4.52	-	0.01	0.04	-	0.03	0.11	0.10	96.88	68.3±3.4
13	0.09	1.20	88.42	0.09	0.12	-	0.95	5.00	-	-	0.02	-	-	0.01	0.04	95.94	81.1±4.1
14	0.13	1.18	88.85	0.05	0.09	-	0.80	5.11	-	-	0.06	0.09	0.10	0.05	0.03	96.54	68.0±3.4
15	0.17	1.20	89.60	0.06	0.06	0.02	0.87	5.17	-	-	0.06	-	0.27	-	-	97.48	73.3±3.7
16	0.15	1.08	88.83	0.04	0.10	0.01	0.84	5.08	-	-	0.10	-	-	-	-	96.23	71.4±3.6
17	0.24	1.25	88.74	0.08	0.07	0.01	0.65	4.48	-	-	0.05	0.01	-	0.02	0.05	95.65	55.3±2.8
18	0.24	1.02	89.06	0.07	0.02	-	0.87	5.04	-	-	0.07	-	-	0.10	0.04	96.53	73.8±3.7
19	0.16	1.19	87.36	0.11	0.10	-	0.92	5.32	-	-	0.03	0.05	0.03	0.16	0.01	95.44	79.5±4.0
20	0.18	1.16	88.93	0.07	0.09	-	0.84	5.12	-	-	0.04	-	-	-	0.09	96.52	71.3±3.6
注：“-”表示低于检测线；U-Th-Pb年龄计算方法依据Ranchin(1968)，年龄误差估算方法依据Bowles(1990).

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表 2 沥青铀矿LA-ICP-MS稀土元素组成(μg/g)

Table 2. Rare Earth Element compositons of pitchblende detected by LA-ICP-MS

点号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	ΣREE	(LREE/HREE)_N
1	14.8	15.8	1.68	8.73	1.43	0.093	4.19	0.43	3.65	0.65	1.61	0.13	1.33	0.11	54.57	1.35
2	120	449	58.0	201	33.9	1.40	23.6	3.18	14.2	2.48	7.09	1.08	6.90	0.78	921.91	4.76
3	10.6	10.1	1.16	5.01	2.36	0.24	1.57	0.13	1.76	0.28	0.86	0.054	0.42	0.024	34.52	2.63
4	13.5	24.3	2.67	9.41	3.54	0.98	-	0.70	4.61	0.23	0.65	0.12	1.01	0.034	61.72	2.79
5	87.7	397	36.1	130	19.3	0.48	22.3	1.14	2.70	-	3.52	0.12	0.16	-	700.43	8.99
6	21.7	31.8	1.65	9.66	3.93	-	1.62	0.80	2.38	2.40	1.11	0.29	2.24	0.56	80.15	1.29
7	13.7	16.7	2.02	11.6	-	-	3.99	0.29	-	0.86	-	0.15	0.72	-	49.96	2.14
8	25.6	15.6	2.40	2.06	2.01	0.64	16.6	0.80	3.14	0.26	2.20	-	4.58	0.25	76.10	0.94
9	35.0	63.9	7.03	31.3	7.62	0.47	8.11	1.08	8.11	2.14	4.50	0.38	3.27	0.50	173.34	1.75
10	86.2	401	52.9	152	36.0	1.33	26.5	0.88	15.1	0.94	3.06	0.66	4.50	0.82	781.89	5.61
11	18.1	47.3	4.34	14.5	6.74	-	4.05	1.40	4.09	0.51	1.96	0.42	2.20	0.59	106.13	1.59
12	18.7	24.6	2.04	13.0	5.86	0.81	4.25	1.16	-	0.031	-	-	2.15	0.36	72.93	2.40
13	20.3	26.6	3.95	9.25	-	0.96	1.68	0.77	2.16	0.088	1.27	-	0.66	0.43	68.08	2.60
14	24.6	30.0	2.33	14.1	4.63	0.96	9.13	0.089	0.096	0.91	0.84	-	-	0.14	87.86	3.00
15	694	2 910	402	1 498	253	11.6	116	18.5	98.4	19.4	46.7	7.19	44.8	5.52	6 125.32	5.14
16	209	819	105	375	70.9	3.36	34.6	5.53	26.3	5.07	13.0	1.77	11.4	1.29	1 681.37	5.16
17	59.2	191	22.7	82.5	18.2	1.22	13.8	2.33	11.8	1.99	5.70	0.87	4.70	0.42	416.71	2.96
18	352	1 558	211	760	136	4.94	65.7	9.62	56.0	8.78	25.0	3.45	28.4	2.97	3 222.88	4.99
19	18.3	27.3	4.48	18.1	5.48	0.23	5.37	0.78	5.54	0.99	2.68	0.26	1.80	0.17	91.57	1.64
20	73.8	275	40.5	144	29.1	1.87	17.3	2.98	18.4	2.76	8.50	1.38	7.04	1.06	623.11	3.11
21	384	1 633	216	772	131	5.97	66.3	10.7	61.1	11.3	27.8	4.61	27.7	3.00	3 354.58	4.69
22	725	3 587	461	1 636	280	13.8	114	18.0	89.4	16.0	42.1	6.48	43.5	4.91	7 035.77	6.33
23	817	3 870	489	1 773	294	11.2	127	19.5	109	17.4	46.1	5.44	51.5	4.90	7 634.29	6.25
24	536	2 475	321	1 163	184	8.39	87.0	12.3	64.4	11.8	30.5	5.20	33.3	3.16	4 934.80	6.04
25	160	736	88.6	321	54.8	3.33	29.7	4.64	22.7	4.34	12.2	1.37	8.18	1.50	1 447.77	5.03
26	303	1 262	153	553	82.2	3.43	44.3	6.28	29.5	5.09	15.5	2.38	14.6	1.83	2 476.71	6.18
27	1 187	5 537	725	2 661	413	14.8	217	28.8	148	27.1	68.2	10.2	59.6	7.60	11 104.04	6.01
28	97.9	463	55.7	206	36.1	1.00	20.3	3.11	12.8	2.53	4.16	1.33	6.52	0.86	911.31	4.93
29	24.0	28.1	2.97	15.3	4.86	0.34	9.05	0.76	3.13	1.11	1.40	0.75	1.92	0.25	93.93	1.37
30	43.9	42.2	4.10	12.6	1.94	0.40	2.74	0.42	3.32	1.15	1.34	0.68	0.99	-	115.79	2.92
31	19.4	30.7	3.18	9.57	3.33	1.11	5.14	0.34	3.39	0.49	1.53	0.15	1.60	0.17	80.02	2.22
32	22.1	31.3	4.52	17.0	4.46	-	4.53	0.56	3.15	1.53	2.36	0.009	0.58	0.067	92.18	2.29
33	606	2 751	325	1 280	207	9.12	80.9	15.6	85.6	11.7	26.5	6.43	27.8	3.98	5 437.39	6.06
34	65.4	245	27.9	90.5	21.2	0.81	12.1	2.48	8.25	1.87	5.21	0.81	7.90	0.55	490.30	3.49
注：“-”表示低于检测线.

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表 3 张家铀矿床沥青铀矿LA-ICP-MS U-Pb同位素组成及年龄

Table 3. LA-ICP-MS U-Pb isotopic compositions and ages of pitchblende from the Zhangjia uranium deposit

样点	UO₂ (%)	Th (μg/g)	Pb (μg/g)	同位素比值及误差						年龄及误差(Ma)
样点	UO₂ (%)	Th (μg/g)	Pb (μg/g)	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
1	91.2	0.078	14 444	0.051 6	0.000 8	0.099 5	0.001 5	0.014 0	0.000 2	333.4	33.3	96.3	1.4	89.7	1.1
2	90.9	0.001 8	13 606	0.050 1	0.000 8	0.091 1	0.001 3	0.013 3	0.000 2	198.2	33.3	88.6	1.2	85.0	1.0
3	89.7	-	15 277	0.051 4	0.000 7	0.105 6	0.001 6	0.014 9	0.000 2	257.5	33.3	102.0	1.5	95.4	1.2
4	92.2	0.42	16 199	0.049 7	0.001 6	0.105 3	0.003 6	0.015 8	0.000 4	189.0	75.9	101.7	3.3	101.0	2.7
5	92.3	-	15 806	0.052 5	0.001 7	0.109 5	0.003 8	0.015 6	0.000 4	309.3	78.7	105.5	3.5	100.0	2.6
6	92.9	0.26	14 756	0.051 7	0.001 8	0.099 7	0.003 6	0.014 3	0.000 4	272.3	77.8	96.5	3.3	91.7	2.4
7	91.9	-	16 781	0.053 3	0.001 8	0.119 5	0.003 9	0.016 8	0.000 4	231.6	79.6	103.6	4.0	100.3	3.0
8	92.1	0.73	16 294	0.050 8	0.001 8	0.107 5	0.004 3	0.015 7	0.000 5	233.4	27.8	94.6	1.3	89.4	1.0
9	91.8	-	14 300	0.050 7	0.000 6	0.097 7	0.001 4	0.014 0	0.000 2	5.7	72.2	89.5	2.4	94.1	2.0
10	92.5	0.86	15 357	0.046 2	0.001 2	0.092 1	0.002 6	0.014 7	0.000 3	150.1	59.3	99.3	2.6	98.1	1.8
11	87.7	0.20	14 993	0.049 0	0.001 2	0.102 7	0.002 8	0.015 3	0.000 3	264.9	58.3	99.2	2.7	93.6	1.7
12	92.1	-	16 514	0.053 0	0.001 4	0.113 4	0.003 7	0.015 6	0.000 4	320.4	33.3	76.0	1.1	68.7	1.0
13	91.0	-	15 126	0.051 6	0.001 4	0.102 7	0.002 9	0.014 6	0.000 3	239.0	33.3	82.2	1.3	76.5	0.8
14	92.2	0.015	16 166	0.054 9	0.001 4	0.114 9	0.003 4	0.015 3	0.000 3	235.3	61.1	89.2	1.3	84.0	1.0
15	91.4	0.42	11 186	0.052 8	0.000 7	0.077 7	0.001 2	0.010 7	0.000 2	283.4	33.3	74.5	1.2	68.0	0.9
16	90.9	0.068	12 759	0.051 0	0.000 7	0.084 3	0.001 4	0.011 9	0.000 1	233.4	35.2	93.5	1.4	88.8	1.3
17	91.0	0.030	14 053	0.050 9	0.000 8	0.091 8	0.001 4	0.013 1	0.000 2	257.5	33.3	88.5	1.3	82.6	1.1
18	89.3	0.68	11 407	0.052 0	0.000 8	0.076 1	0.001 2	0.010 6	0.000 1	300.1	29.6	78.5	1.0	71.8	0.8
19	88.2	0.019	14 609	0.050 7	0.000 8	0.096 4	0.001 5	0.013 9	0.000 2	161.2	51.8	64.6	1.7	61.7	0.9
20	90.4	0.020	14 106	0.051 4	0.000 7	0.091 1	0.001 4	0.012 9	0.000 2	264.9	50.9	64.1	1.4	58.9	0.9
21	90.6	0.20	12 135	0.052 1	0.000 7	0.080 4	0.001 1	0.011 2	0.000 1	327.8	38.9	69.0	1.6	61.8	1.1
22	92.7	0.20	10 927	0.049 3	0.001 1	0.065 7	0.001 8	0.009 6	0.000 1	231.6	71.3	84.6	1.7	79.4	1.2
23	91.4	-	10 288	0.051 6	0.001 0	0.065 2	0.001 5	0.009 2	0.000 1	300.1	37.0	79.3	1.3	72.7	1.0
24	90.0	0.13	10 362	0.053 0	0.000 9	0.070 3	0.001 6	0.009 6	0.000 2	301.9	55.6	51.6	2.0	46.1	1.5
25	89.8	0.44	12 832	0.050 8	0.000 9	0.086 9	0.001 8	0.012 4	0.000 2	344.5	47.2	103.6	1.9	94.5	1.5
26	89.8	0.14	11 453	0.052 2	0.000 9	0.081 2	0.001 4	0.011 3	0.000 2	209.3	42.6	103.0	1.9	99.1	1.3
27	92.8	0.055	8 511	0.052 4	0.001 2	0.052 1	0.002 1	0.007 2	0.000 2	183.4	15.7	91.5	2.1	88.5	1.5
28	92.1	-	14 832	0.053 2	0.001 0	0.107 4	0.002 0	0.014 8	0.000 2	231.6	44.4	104.1	2.1	98.9	1.5
29	92.6	0.38	15 346	0.050 3	0.001 0	0.106 8	0.002 0	0.015 5	0.000 2	166.8	44.4	79.7	1.5	77.5	1.2
30	93.3	0.039	13 886	0.049 8	0.001 0	0.094 3	0.002 2	0.013 8	0.000 2	324.1	42.6	108.2	1.9	99.4	1.5
31	89.9	0.059	18 251	0.048 6	0.001 1	0.126 5	0.005 8	0.018 4	0.000 5	333.4	33.3	96.3	1.4	89.7	1.1
32	89.7	-	14 855	0.050 8	0.001 0	0.108 0	0.002 3	0.015 5	0.000 2	198.2	33.3	88.6	1.2	85.0	1.0
33	90.0	0.14	11 378	0.049 2	0.000 9	0.081 6	0.001 6	0.012 1	0.000 2	257.5	33.3	102.0	1.5	95.4	1.2
34	90.6	0.072	14 943	0.052 9	0.001 0	0.112 5	0.002 1	0.015 5	0.000 2	189.0	75.9	101.7	3.3	101.0	2.7
注：“-”表示低于检测线.

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表 4 近年来华南花岗岩型铀矿床沥青铀矿微区原位测年结果

Table 4. A summary of recently avalible insitu pitchblende ages of uranium deposits in South China Block

矿田	矿床	年龄(Ma)	测试对象	测试方法	资料来源
苗儿山	张家	71.4±1.9	沥青铀矿	EPMA U-Th-Pb	本文
	张家	69.4±4.9	沥青铀矿	LA-ICP-MS U-Pb	本文
	沙子江	97.5±4.0	沥青铀矿	EPMA U-Th-Pb	Luo et al., 2015b
		70.2±1.6	沥青铀矿	EPMA U-Th-Pb	Luo et al., 2015b
		72.4±4.4	沥青铀矿	LA-ICP-MS U-Pb	笔者未发表数据
		75.0±1.9	沥青铀矿	LA-ICP-MS U-Pb	笔者未发表数据
	孟公界	1.9±0.7	沥青铀矿	SIMS U-Pb	Luo et al., 2017
	孟公界	2.3±0.1	沥青铀矿	EPMA U-Th-Pb	Luo et al., 2017
诸广南	棉花坑	80±9	沥青铀矿	SIMS U-Pb	Bonnetti et al., 2017
		65±5	沥青铀矿	SIMS U-Pb	Bonnetti et al., 2017
		81±2	沥青铀矿	SIMS U-Pb	Bonnetti et al., 2017
		74±1	沥青铀矿	SIMS U-Pb	Bonnetti et al., 2017
		62±1	沥青铀矿	SIMS U-Pb	Bonnetti et al., 2017
	澜河	67.8±0.9	沥青铀矿	EPMA U-Th-Pb	葛祥坤, 2013
		73.3±4.7	沥青铀矿	SIMS U-Pb	骆金诚, 2015
		66.5±2.0	沥青铀矿	EPMA U-Th-Pb	骆金诚, 2015
下庄	石土岭	134±2	沥青铀矿	SIMS U-Pb	Bonnetti et al., 2017
	石土岭	127±2	沥青铀矿	SIMS U-Pb	Bonnetti et al., 2017
	希望	72±2	沥青铀矿	SIMS U-Pb	Bonnetti et al., 2017
		66±1	沥青铀矿	SIMS U-Pb	Bonnetti et al., 2017
		62±1	沥青铀矿	SIMS U-Pb	Bonnetti et al., 2017
	仙石	52±2	沥青铀矿	SIMS U-Pb	Bonnetti et al., 2017
		41±1	沥青铀矿	SIMS U-Pb	Bonnetti et al., 2017
		135±4	沥青铀矿	SIMS U-Pb	Luo et al., 2015a
		113±2	沥青铀矿	SIMS U-Pb	Luo et al., 2015a
		104±2	沥青铀矿	SIMS U-Pb	Luo et al., 2015a

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