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    东昆仑造山带海德乌拉铀矿床沥青铀矿年代学特征及成因

    朱坤贺 戴佳文 王凯兴 刘晓东 余驰达 雷勇亮 孙立强 何世伟

    朱坤贺, 戴佳文, 王凯兴, 刘晓东, 余驰达, 雷勇亮, 孙立强, 何世伟, 2022. 东昆仑造山带海德乌拉铀矿床沥青铀矿年代学特征及成因. 地球科学, 47(8): 2940-2950. doi: 10.3799/dqkx.2021.216
    引用本文: 朱坤贺, 戴佳文, 王凯兴, 刘晓东, 余驰达, 雷勇亮, 孙立强, 何世伟, 2022. 东昆仑造山带海德乌拉铀矿床沥青铀矿年代学特征及成因. 地球科学, 47(8): 2940-2950. doi: 10.3799/dqkx.2021.216
    Zhu Kunhe, Dai Jiawen, Wang Kaixing, Liu Xiaodong, Yu Chida, Lei Yongliang, Sun Liqiang, He Shiwei, 2022. Age and Genesis of Pitchblende of the Haidewula Uranium Deposit, East Kunlun Orogen and Its Geological Significance. Earth Science, 47(8): 2940-2950. doi: 10.3799/dqkx.2021.216
    Citation: Zhu Kunhe, Dai Jiawen, Wang Kaixing, Liu Xiaodong, Yu Chida, Lei Yongliang, Sun Liqiang, He Shiwei, 2022. Age and Genesis of Pitchblende of the Haidewula Uranium Deposit, East Kunlun Orogen and Its Geological Significance. Earth Science, 47(8): 2940-2950. doi: 10.3799/dqkx.2021.216

    东昆仑造山带海德乌拉铀矿床沥青铀矿年代学特征及成因

    doi: 10.3799/dqkx.2021.216
    基金项目: 

    国家自然科学基金项目 42072095

    中国核工业集团高校科研攻关项目 201619

    青海省科技厅重点研发与转化计划"青海省东昆仑火山岩型铀矿资源调查理论创新与找矿突破" 2021⁃SF⁃157

    详细信息
      作者简介:

      朱坤贺(1996—),女,硕士研究生,从事地质学研究.ORCID:0000-0001-8986-9551.E-mail:1293682238@qq.com

      通讯作者:

      王凯兴, ORCID:0000-0002-7380-3387.E-mail: xy2gmo02@ecut.edu.cn

    • 中图分类号: P597;P597+.3

    Age and Genesis of Pitchblende of the Haidewula Uranium Deposit, East Kunlun Orogen and Its Geological Significance

    • 摘要: 海德乌拉铀矿床位于东昆仑造山带东段,是西北地区最近发现的与火山岩有关的独立铀矿床,对其研究有助于揭示青藏高原热液铀成矿机制. 利用扫描电镜、电子探针和激光原位分析等对海德乌拉铀矿床沥青铀矿开展了化学成分分析和同位素定年等工作. 结果显示海德乌拉铀矿床沥青铀矿具有较高的Ca和REE含量,较低的LREE/HREE比值. 沥青铀矿电子探针U⁃Th⁃Pb化学年龄为226~350 Ma,峰值为289 Ma;U⁃Pb同位素年龄为234.6±1.2 Ma(MSWD=0.99,n=17). 两组年龄的差异可能与海德乌拉铀矿床沥青铀矿中存在普通铅而导致电子探针U⁃Th⁃Pb化学定年失准有关. 研究认为海德乌拉铀矿床沥青铀矿形成于岩浆期后富Ca的中温热液,矿床的形成可能与古特提斯构造域布青山-阿尼玛卿洋北向俯冲-碰撞后的伸展环境有关.

       

    • 图  1  (a)东昆仑造山带构造简图(改自Dong et al., 2018);(b)海德乌拉铀矿床地质简图(改自雷勇亮等,2021

      Fig.  1.  (a) Simplified tectonic map of the East Kunlun Orogenic Belt (from Dong et al., 2018); (b) Simplified geological map of the Haidewula volcanic rock area (from Lei et al., 2021)

      图  2  海德乌拉铀矿床的矿石特征

      a. 隐爆角砾岩型矿石;b. 紫黑色萤石化矿石;c. 浸染状赤铁矿-黄铁矿化矿石;d. 硅化-碳酸盐化矿石;e. 脉状萤石化-碳酸盐化矿石;Fl. 萤石;Py. 黄铁矿;Hem. 赤铁矿;Qtz. 石英;Cal. 方解石

      Fig.  2.  Ore characteristics of theHaidewula uranium deposit

      图  3  海德乌拉铀矿床沥青铀矿产状

      a.沥青铀矿薄片;b.沥青铀矿的显微镜图(反射光);c.沥青铀矿的BSE图

      Fig.  3.  The occurrence diagrams of pitchblende in the Haidewula uranium deposit

      图  4  海德乌拉铀矿床沥青铀矿CaO⁃UO2(a)、FeO⁃PbO(b)、SiO2+FeO⁃PbO(c)和SiO2⁃PbO(d)图

      Fig.  4.  The CaO⁃UO2(a), FeO⁃PbO(b), SiO2+FeO⁃PbO (c) and SiO2⁃PbO(d) diagrams of pitchblende in the Haidewula uranium deposit

      图  5  海德乌拉铀矿床沥青铀矿稀土元素球粒陨石标准化配分

      稀土元素标准化值据Boynton(1984),底图改自Mercadier et al.(2011)Frimmel et al.(2014)

      Fig.  5.  Chondrite⁃normalization REE patterns of pitchblende in the Haidewula uranium deposit

      图  6  海德乌拉铀矿床沥青铀矿稀土总量与U/Th关系

      底图据Frimmel et al.(2014)

      Fig.  6.  Total REE versus U/Th diagram for pitchblende in the Haidewula uranium deposit

      图  7  海德乌拉铀矿床沥青铀矿化学年龄频数图(a)及U⁃Pb同位素年龄谐和图(b)

      Fig.  7.  Frequencyof chemical age (a) and U⁃Pb isotope age concordance(b) diagrams of pitchblende in theHaidewulauranium deposit

      图  8  东昆仑造山带岩浆岩成岩和成矿年龄直方图

      其成岩年龄来自Dong et al.(2018);成矿年龄来自补充材料中的文献

      Fig.  8.  Diagenetic and metallogenicages histogramsin the East Kunlun orogenic belt

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