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

康滇地轴中南段牟定1101铀矿区沥青铀矿成矿时代及成因

doi: 10.3799/dqkx.2019.058

武勇^1,2, ,,
秦明宽^1, ,,
郭冬发²,
蔡煜琦¹,
王凤岗¹,
吴玉¹,
郭国林³,
刘章月¹

1.
中核集团核工业北京地质研究院, 中核集团铀资源勘查实验室, 北京 100029
2.
核工业北京地质研究院分析测试研究所, 北京 100029
3.
东华理工大学放射性地质与勘探技术国防重点学科实验室, 江西南昌 330013

基金项目:

中核集团启明星项目 2018（294）

国防预研项目 3210402

中国地质调查局项目 DD2016013628

中国核工业地质局项目 201713

中国核工业地质局项目 201653

详细信息

作者简介:
武勇(1986-), 男, 博士, 主要从事铀矿地质勘查与二次离子质谱同位素地质年代学研究

通讯作者:
秦明宽

中图分类号: P629;P597;P611
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出版历程
- 收稿日期: 2019-10-05
- 刊出日期: 2020-02-15

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

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

摘要

摘要: 牟定1101铀矿区是康滇地轴中南段发现高品位、巨粒晶质铀矿代表性产地之一.为了解铀矿物的形成时代及成因，利用微区、原位分析技术（EPMA、SEM、LA-ICP-MS）对该区3件沥青铀矿样品开展了主量化学成分、稀土元素分析及年龄测定.沥青铀矿电子探针（EPMA）化学成分具有高PbO、ThO₂、Y₂O₃，低SiO₂，Na₂O，CaO，K₂O，ZrO₂含量特征，反映沥青铀矿形成之后遭受后期的蚀变、改造作用较弱.沥青铀矿的稀土元素ΣREE-（U/Th）、ΣREE-（ΣREE/ΣREE）_N图解表明其为岩浆作用相关成因、形成于高温环境（T>450℃）.3件沥青铀矿的U-Pb同位素年龄在（950±5 Ma、MSWD=0.025，953±9 Ma、MSWD=0.051，954±8 Ma、MSWD=0.085）之间，表明它们具有相近的形成时代（新元古界晚期）.对比国外不同类型铀矿床，该区的铀成矿作用具有岩浆成因特征.新元古界晚期，Rodinia超大陆由聚合转化为裂解阶段，广泛引起了Pt₁j苴林群发生区域变质、混合岩化、铀成矿作用.牟定1101铀矿区的成矿作用与~960 Ma Rodinia超大陆裂解地质事件所对应的晋宁构造运动有关.
- 康滇地轴 /
- 1101铀矿区 /
- 沥青铀矿LA-ICP-MS U-Pb定年 /
- 地球化学
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

HTML全文

图 1 牟定1101铀矿区地质简图

1.第四系；2.上侏罗统蛇店组；3.上侏罗统张家河组；4.下侏罗统冯家河组；5.下侏罗统干海子组；6.古元古界苴林群；7.寒武纪地层；8.晋宁期花岗岩；9.正断层；10.逆断层；11.推测断层；12.铀矿点

Fig. 1. Geological sketch of Mouding uranium area

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图 2 1101铀矿区露头及手标本照片

a.铀矿点γ放射值；b.铀矿点露头铀矿物特征；c, d.为沥青铀矿测年、沥青铀矿单矿物分选样品; Ur.伽马（γ）放射值；Pit.沥青铀矿；Ur.晶质铀矿；Ua.钙铀云母；Qtz-Vein.石英脉；Ca.碳酸盐化；He.赤铁矿化

Fig. 2. Outcrop and H and specimen of the 1101 uranium ore area

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图 3 1101铀矿区沥青铀矿反射光、背散射（BSE）图像及测点位置

a, c. MD01、MD31反射光照片；b, d. MD01、MD31背散射（BSE）照片；e. MD02沥青铀矿单矿物背散射（BSE）照片；红色圈为LA-ICP-MS同位素测试点区域；黄色圈为EPMA测试区域

Fig. 3. The analytical spot, Microscope and BSE images of the pitchblende

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图 4 1101铀矿区沥青铀矿化学成分与UO₂相关图

Fig. 4. The correlation diagram of pitchblende chemical composition and UO₂ of 1101 uranium ore area

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图 5 1101铀矿区沥青铀矿LA-ICP-MS U-Pb年龄谐和图

a, b. MD01沥青铀矿同位素激光年龄图；c，d. MD02沥青铀矿激光同位素年龄图；e，f. MD31沥青铀矿激光同位素年龄图

Fig. 5. Concordia diagram of pitchblende from 1101 uranium ore area

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图 6 1101铀矿区MD01、MD02、MD31沥青铀矿样品LA-ICP-MS REE模式图

Fig. 6. Chondrite normalized REE patterns of pitchblende of the 1101 uranium ore area

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图 7 图a为1101铀矿区沥青铀矿主量元素（EPMA）；图b为REE配分模式图与世界典型不同成因类型铀矿床对比图（数据据Alexandre, 2015）

Fig. 7. The chemical composition and REE normalized patterns of differernt types uranium deposits

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图 8 图a为1101铀矿区沥青铀矿ΣREE-(U/Th)(底图据Frimmel et al., 2014)；图b为ΣREE-(ΣREE/ΣREE)_N图解(底图据Mercadier et al., 2011)

Fig. 8. The diagram of ΣREE-(U/Th); ΣREE-(ΣREE/ΣREE)_N of 1101 uranium ore area

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图 9 1101铀矿区沥青铀矿与围岩稀土元素配分模式图

Fig. 9. The REE patterns of pitchblende and wall rock of the 1101 uranium ore area

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