粤北石角围花岗岩型铀矿床沥青铀矿LA-ICP-MS原位U-Pb定年研究

张伟盟; 严杰; 钟福军; 潘家永; 刘文泉; 赖静; 周堂波

doi:10.15898/j.cnki.11-2131/td.201901160007

粤北石角围花岗岩型铀矿床沥青铀矿LA-ICP-MS原位U-Pb定年研究

1.
核资源与环境国家重点实验室, 东华理工大学, 江西南昌 330013

2.
核工业二九〇研究所, 广东韶关 512026

基金项目:
科技部重点研发计划项目(2017YFC0602600);国家自然科学基金项目(41772066, 41702076);核资源与环境国家重点实验室开放基金项目(NRE1807);江西省教育厅科技项目(GJJ180394)

详细信息

作者简介: 张伟盟, 硕士研究生, 地质学专业。E-mail:523289879@qq.com

通讯作者: 潘家永, 博士, 教授, 主要从事矿床地球化学研究。E-mail:jypan@ecit.cn

中图分类号: P597.3;O657.63;P619.14

收稿日期: 2019-01-16

修回日期: 2019-03-18

录用日期: 2019-04-09

In situ LA-ICP-MS U-Pb Dating of Uraninite from the Shijiaowei Granite-type Uranium Deposit, Northern Guangdong Province

1.
State Key Laboratary of Nuclear Resource and Environment, East China University of Technology, Nanchang 330013, China

2.
No. 290 Research Institute, China National Nuclear Corporation, Shaoguan 512026, China

More Information

Corresponding author: Jia-yong PAN, jypan@ecit.cn

Received Date: 16 January 2019

Revised Date: 18 March 2019

Accepted Date: 09 April 2019

摘要

摘要: 石角围花岗岩型铀矿床位于粤北下庄铀矿田东部，沥青铀矿是矿床的主要矿石矿物，也是厘定成矿年龄的理想对象。前人采用同位素稀释法（ID-TIMS）和电子探针U-Th-^totalPb化学定年法获得的成矿年龄为38~138Ma，但前人年龄变化范围大，可靠性有待考究，难以有效约束矿床的成矿时代。本文利用LA-ICP-MS原位微区分析技术，对石角围矿床矿石中沥青铀矿开展了原位U-Pb定年。研究表明：沥青铀矿的²⁰⁶Pb/²³⁸U年龄为52.46~56.89Ma，加权平均年龄为54.68±0.53Ma（MSWD=1.19，n=18）。本次沥青铀矿原位U-Pb定年与前人相比更好地避免了矿物包裹体、后期次生变化、显微裂隙等因素的影响，获得的沥青铀矿原位U-Pb同位素年龄代表矿床的成矿年龄。本研究获得的石角围矿床成矿年龄（~55Ma）与华南花岗岩型铀矿床主成矿期（~50Ma）相一致，指示石角围矿床铀成矿作用与华南岩石圈局部伸展作用下的断裂构造活动密切相关。
- 原位U-Pb定年 /
- LA-ICP-MS /
- 沥青铀矿 /
- 成矿年龄
Abstract: BACKGROUNDThe Shijiaowei uranium deposit (No.339 deposit) in the Eastern Guidong granite complex of Nanling region, is one of the large type deposits in the Xiazhuang uranium ore field. Uraninite, the main ore mineral of the Shijiaowei deposit, is the ideal mineral for geochronology. Previous studies show that the uranium mineralize ages of Shijiaowei deposit is 38-138Ma acquired by ID-TIMS and EMPA. OBJECTIVESTo provide new insight for uranium metallogenic mechanism and background of the Shijiaowei deposit by a new reliable uranium mineralization age determination method. METHODSIn situ LA-ICP-MS U-Pb dating method was used to constrain the formation age of uraninite from the Shijiaowei deposit. RESULTSThe ²⁰⁶Pb/²³⁸U age of uraninite was 52.46-56.89Ma with the weighted average age of 54.68±0.53Ma (MSWD=1.19, n=18). The in situ U-Pb dating of the uraninite avoids the influence of mineral inclusions, secondary changes and micro-cracks on dating. CONCLUSIONSTherefore, the in situ U-Pb isotopic age of the uraninite determined by LA-ICP-MS represents the ore-forming age of the deposit. The ore-forming age (about 55Ma) is consistent with the main metallogenic period (about 50Ma) of the South China granite-type uranium deposit, indicating that the uranium mineralization of the Shijiao ore deposit is closely related to fault tectonic activity induced by the local extension of the lithosphere in South China.
- in situ U-Pb dating /
- LA-ICP-MS /
- uraninite /
- mineralization age

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图 1 下庄铀矿田地质略图

Figure 1.

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图 2 铀矿石照片(a)和沥青铀矿的背散射电子图像(b)

Figure 2.

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图 3 (a) 沥青铀矿U-Pb年龄谐和图与(b)²⁰⁶Pb/²³⁸U年龄加权平均图

Figure 3.

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表 1 SJW1601样品沥青铀矿主量元素含量分析结果

Table 1. Major element compositions of uraninite in the sample SJW1601

测点编号	元素含量(%)
测点编号	La₂O₃	UO₂	Na₂O	Ce₂O₃	ThO₂	Al₂O₃	Nd₂O₃	PbO	SiO₂	Y₂O₃	MgO	BaO	P₂O₅	FeO	TiO₂	Nb₂O₅	Ta₂O₅	CaO	总计
01	-	85.86	0.07	0.01	-	0.15	-	0.86	1.26	0.02	0.03	0.01	0.02	0.60	0.03	-	-	7.56	97.12
02	-	85.39	0.03	0.07	-	0.11	-	0.91	1.25	-	0.03	0.01	0.03	0.74	0.01	-	-	7.92	97.36
03	-	84.69	0.04	0.18	-	0.11	-	1.11	1.17	0.02	0.01	0.03	0.02	0.66	0.24	-	-	8.06	96.85
04	0.02	83.72	0.08	0.07	-	0.16	-	0.78	1.51	0.01	0.04	-	0.01	0.80	0.03	-	-	8.20	96.07
05	0.00	84.26	0.04	0.08	-	0.17	0.03	0.62	1.51	0.01	0.02	-	0.03	0.76	0.07	0.06	-	8.24	96.62
07	-	84.52	0.07	0.05	-	0.15	-	0.77	1.30	0.00	0.03	0.14	0.04	0.79	0.02	0.00	-	8.39	97.01
08	-	84.05	0.11	0.10	-	0.20	-	0.74	1.69	0.03	0.01	0.06	0.02	0.74	0.01	-	0.01	8.25	96.82
09	-	85.07	0.06	0.08	-	0.12	-	0.86	1.31	0.02	0.05	0.01	0.05	0.72	-	-	-	7.97	96.95
10	-	85.57	0.06	0.13	-	0.14	-	0.82	1.26	-	0.02	0.02	0.03	0.58	-	-	-	7.89	96.98
11	0.02	83.94	0.04	0.10	-	0.14	-	0.74	1.32	0.01	0.02	-	-	0.70	0.10	0.02	-	8.15	95.79
12	0.00	85.31	0.11	0.10	-	0.16	-	0.68	1.36	-	0.02	0.13	0.05	0.71	-	-	-	8.17	97.55
13	-	83.96	0.05	0.07	-	0.11	-	0.73	1.20	0.01	0.04	0.15	0.01	0.78	-	-	0.08	7.90	95.75
14	-	85.36	0.12	0.04	-	0.16	-	0.77	1.37	-	0.02	0.08	0.05	0.76	-	-	-	8.32	97.72
15	-	83.70	0.05	0.03	-	0.17	-	0.66	1.60	0.01	0.02	0.01	0.02	0.66	-	-	0.05	8.87	96.46
注：“-”表示低于电子探针的检出限。

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表 2 SJW1601样品沥青铀矿U-Pb同位素分析结果

Table 2. U-Pb isotopic compositions of uraninite in the sample SJW1601

测点编号	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
测点编号	比值	1σ	比值	1σ	比值	1σ	年龄(Ma)	1σ	年龄(Ma)	1σ	年龄(Ma)	1σ
01	0.0526	0.0018	0.0613	0.0020	0.0085	0.0002	309.32	75.9	60.44	1.9	54.62	1.0
02	0.0517	0.0014	0.0609	0.0019	0.0086	0.0002	272.29	69.4	60.00	1.8	54.89	1.1
03	0.0532	0.0016	0.0628	0.0018	0.0086	0.0001	338.95	97.2	61.84	1.7	55.05	0.9
05	0.0463	0.0017	0.0537	0.0020	0.0084	0.0001	13.06	88.9	53.11	1.9	54.15	0.9
06	0.0476	0.0018	0.0563	0.0020	0.0087	0.0002	79.72	88.9	55.65	1.9	55.71	1.1
07	0.0483	0.0015	0.0575	0.0019	0.0086	0.0002	122.31	72.2	56.75	1.8	55.30	1.0
08	0.0516	0.0015	0.0602	0.0017	0.0085	0.0001	333.39	73.1	59.33	1.6	54.69	0.9
09	0.0463	0.0015	0.0536	0.0018	0.0083	0.0001	13.06	87.0	52.98	1.7	53.41	0.8
10	0.0420	0.0039	0.0520	0.0044	0.0086	0.0001	error	error	51.45	4.2	55.45	0.9
11	0.0498	0.0020	0.0621	0.0035	0.0086	0.0002	187.12	89.8	61.17	3.4	55.47	1.1
12	0.0472	0.0016	0.0543	0.0017	0.0084	0.0001	57.50	142.6	53.65	1.6	54.09	1.0
13	0.0535	0.0018	0.0649	0.0022	0.0088	0.0002	350.06	78.7	63.83	2.1	56.28	1.0
14	0.0573	0.0016	0.0671	0.0020	0.0085	0.0002	501.89	63.0	65.93	1.9	54.37	1.0
16	0.0486	0.0018	0.0597	0.0023	0.0089	0.0002	131.57	85.2	58.85	2.2	56.89	1.2
17	0.0492	0.0019	0.0572	0.0020	0.0086	0.0002	166.75	95.4	56.50	2.0	55.30	1.0
18	0.0524	0.0019	0.0610	0.0022	0.0085	0.0002	301.91	86.1	60.12	2.1	54.71	1.1
19	0.0513	0.0018	0.0574	0.0021	0.0082	0.0001	253.77	81.5	56.71	2.0	52.46	1.0
21	0.0489	0.0018	0.0570	0.0021	0.0085	0.0002	138.98	89.8	56.26	2.1	54.53	1.0
23	0.0530	0.0018	0.0597	0.0020	0.0083	0.0001	327.84	75.0	58.91	1.9	53.26	0.9

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