【引用本文】 张伟盟, 严杰, 钟福军, 等. 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[J]. 岩矿测试, 2019, 38(4): 449-460. doi: 10.15898/j.cnki.11-2131/td.201901160007
ZHANG Wei-meng, YAN Jie, ZHONG Fu-jun, et al. In situ LA-ICP-MS U-Pb Dating of Uraninite from the Shijiaowei Granite-type Uranium Deposit, Northern Guangdong Province[J]. Rock and Mineral Analysis, 2019, 38(4): 449-460. 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

收稿日期: 2019-01-16  修回日期: 2019-03-18  接受日期: 2019-04-09

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)

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

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

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

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

Received Date: 2019-01-16
Revised Date: 2019-03-18
Accepted Date: 2019-04-09

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。

关键词: 原位U-Pb定年, LA-ICP-MS, 沥青铀矿, 成矿年龄

要点

(1) 利用LA-ICP-MS原位微区分析技术获得石角围矿床沥青铀矿206Pb/238U年龄54.68±0.53Ma。

(2) 花岗岩型铀矿沥青铀矿LA-ICP-MS原位U-Pb定年比传统定年方法可靠程度更高。

(3) 揭示了石角围矿床形成于古近纪华南岩石圈伸展构造背景。

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

ABSTRACT

BACKGROUND:

The 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.

OBJECTIVES:

To provide new insight for uranium metallogenic mechanism and background of the Shijiaowei deposit by a new reliable uranium mineralization age determination method.

METHODS:

In situ LA-ICP-MS U-Pb dating method was used to constrain the formation age of uraninite from the Shijiaowei deposit.

RESULTS:

The 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.

CONCLUSIONS:

Therefore, 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.

KEY WORDS: in situ U-Pb dating, LA-ICP-MS, uraninite, mineralization age

HIGHLIGHTS

(1) In situ LA-ICP-MS U-Pb dating of uraninite from the Shijiaowei granite-type uranium deposit yielded an age of 54.68±0.53Ma.

(2) Compared with the traditional dating methods, in situ LA-ICP-MS U-Pb dating of uraninite was more reliable for the granite-type uranium deposits.

(3) The uranium mineralization of Shijiaowei deposit occurred at the Paleogene lithospheric extension of South China.

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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

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