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    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

    武勇, 秦明宽, 郭冬发, 蔡煜琦, 王凤岗, 吴玉, 郭国林, 刘章月, 2020. 康滇地轴中南段牟定1101铀矿区沥青铀矿成矿时代及成因. 地球科学, 45(2): 419-433. doi: 10.3799/dqkx.2019.058
    引用本文: 武勇, 秦明宽, 郭冬发, 蔡煜琦, 王凤岗, 吴玉, 郭国林, 刘章月, 2020. 康滇地轴中南段牟定1101铀矿区沥青铀矿成矿时代及成因. 地球科学, 45(2): 419-433. doi: 10.3799/dqkx.2019.058
    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

    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
    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

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

    • 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.

       

    • 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

      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

      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

      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

      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

      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

      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

      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

      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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