康滇地轴中南段牟定1101铀矿区沥青铀矿成矿时代及成因

武勇; 秦明宽; 郭冬发; 蔡煜琦; 王凤岗; 吴玉; 郭国林; 刘章月

doi:10.3799/dqkx.2019.058

Volume 45 Issue 2

Feb. 2020

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Article Navigation > Earth Science > 2020 > 45(2): 419-433

Wu Yong, Qin Mingkuan, Guo Dongfa, Cai Yuqi, Wang Fengang, Wu Yu, Guo Guolin, Liu Zhangyue, 2020. Metallogenic Chronology of the Pitchblende of 1101 Uranium Ore Area in Mouding, Middle-South Part of the Kangdian Axis and Its Geological Significance. Earth Science, 45(2): 419-433. doi: 10.3799/dqkx.2019.058

Citation:

Wu Yong, Qin Mingkuan, Guo Dongfa, Cai Yuqi, Wang Fengang, Wu Yu, Guo Guolin, Liu Zhangyue, 2020. Metallogenic Chronology of the Pitchblende of 1101 Uranium Ore Area in Mouding, Middle-South Part of the Kangdian Axis and Its Geological Significance. Earth Science, 45(2): 419-433. doi: 10.3799/dqkx.2019.058

Citation:

Wu Yong, Qin Mingkuan, Guo Dongfa, Cai Yuqi, Wang Fengang, Wu Yu, Guo Guolin, Liu Zhangyue, 2020. Metallogenic Chronology of the Pitchblende of 1101 Uranium Ore Area in Mouding, Middle-South Part of the Kangdian Axis and Its Geological Significance. Earth Science, 45(2): 419-433. doi: 10.3799/dqkx.2019.058

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Metallogenic Chronology of the Pitchblende of 1101 Uranium Ore Area in Mouding, Middle-South Part of the Kangdian Axis and Its Geological Significance

doi: 10.3799/dqkx.2019.058

Wu Yong^{1,2
,
,},
Qin Mingkuan^{1
,
,},
Guo Dongfa²,
Cai Yuqi¹,
Wang Fengang¹,
Wu Yu¹,
Guo Guolin³,
Liu Zhangyue¹

1.
CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology, Beijing Research Institute of Uranium Geology, Beijing 100029, China
2.
Analytical Laboratory, Beijing Research Institute of Uranium Geology, Beijing 100029, China
3.
Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China University of Technology, Nanchang 330013, China

Received Date: 2019-10-05
Publish Date: 2020-02-15

Abstract

Abstract

The 1101 uranium ore area is one of the representative uranium deposits, which has high-grade and larger uraninite. In order to know the genesis and metallogenic age of the pitchblende, the in-situ analytical technologies(EPMA、SEM、LA-ICP-MS) was applied to analyze the three pitchblende samples.The chemical composition of EPMA indicate that pitchblende exhibits high contents of PbO, ThO₂, Y₂O₃ and low SiO₂, Na₂O, CaO, K₂O, ZrO₂, which shows that it has suffered less alteration after crystallization.The REE diagram of(ΣREE-(U/Th), ΣREE-(ΣREE/ΣREE)_N)reflects that these pitchblend crystalized in the condition of magamatic process, related to a high temperature environment(T>450℃).The LA-ICP-MS of pitchblende U-Pb dating yields the age of (950±5 Ma, MSWD=0.025, 953±9 Ma, MSWD=0.051, 954±8 Ma, MSWD=0.085), providing the metallogenic age constraint on the 1101 uranium ore area(Late-Neoproterozoic).Compared with different types of uranium deposits abroad, the 1101 uranium ore was of magamatic origin that had undergone the process of migmatization.The Rondinia super continent was in the transition from convergence to split at the period of Late-Neoproterozoic, which led to the Pt₁j strata generated regional metamorphism, migmatization and uranium mineralization.The metallogenic age ca.960 Ma of 1101 uranium deposit corresponds to the Jinningian tectonic movement, which belongs to the Rondinia supercontinenal spilitting geological event.
- Kangdian Axis,
- 1101 uranium ore area,
- pitchblende LA-ICP-MS U-Pb dating,
- geochemistry

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References(82)

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