邹家山矿床蚀变碎斑熔岩地化特征及意义
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P595

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国家自然科学基金(41602071)、中国核工业集团公司项目(中核地计[2008]74)


Geochemical Characteristics and Aignificance of Altered Porphyroclastic Lava in The Zoujiashan Uranium Deposit
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    摘要:

    热液交代蚀变是热液矿床中普遍存在的地质现象,研究交代蚀变过程中元素的带入、迁出及富集对了解矿床成因起到指示作用。本文以邹家山铀矿床为研究对象,系统采集了新鲜和蚀变碎斑熔岩样品,其中蚀变样品分为以钠长石化为主、以钾长石化为主以及以绢云母化为主。通过对不同蚀变样品全岩元素地球化学以及蚀变作用过程中元素迁移特征的研究,得出以下认识:(1)新鲜碎斑熔岩样品为高钾钙碱性,属弱过铝质-强过铝质火山岩;(2)Th、Zr、Hf等微量元素含量与铀含量变化一致,HREE与铀富集关系密切;(3)以钠长石化为主的样品Si、Mn、Mg、K、Ca、P、Rb、U为强活动性元素,U的ΔC/CO均值为69.56;(4)以钾长石化为主的样品Mn、Mg、Ca、Na、P、U、Th和重稀土元素为强活动性元素,U的ΔC/CO均值为18.53;(5)以绢云母化为主的样品Si、Al、Mn、Na、K、P、U、Th和大部分稀土元素都属于强活动性元素,U的ΔC/CO均值为159.70。由此得,以绢云母化为主的酸性蚀变是形成富铀矿的必要条件。

    Abstract:

    Hydrothermal alteration is a prevalent signature in hydrothermal deposits, which plays a critical role in controlling element mobility and enrichment and thus provides vital constraints on understanding deposits’ genesis. The samples from the Zoujiashan uranium deposit are divided into fresh and altered porphyroclastic lava, of which the altered samples can be divided into albitization, potassium feldspathization and illitization respectively. Through the study of Whole-rock geochemical and element migration during the alteration, several important points with were reached: (1) the fresh volcanic rocks belong to high K calc-alkaline to shoshonitic series and are lightly to strongly peraluminous; (2) The content’s change of the trace elements such as Th, Zr and Hf are consistent with those of uranium, and HREE are related to uranium enrichment closely; (3) Si, Mn, Mg, K, Ca, P, Rb and U were extensively mobile during albitization, the average △C/C0 values of U is 69.56; (4) Mn, Mg, Ca, Na, P, U, Th and HREE have high activity during potassium feldspathization, the average △C/C0 values of U is 18.53; (5) Si, Al, Mn, Na, K, P, U and most rare earth elements were highly mobile during illitization with the average △C/C0 values of U is 159.70. The results indicate that the acid-alteration dominated by illitization is necessary for the forming of rich uranium ores.

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余驰达,刘晓东,王凯兴. 邹家山矿床蚀变碎斑熔岩地化特征及意义[J]. 科学技术与工程, 2020, 20(22): 8875-8887.
Yu Chida, Wang Kaixing. Geochemical Characteristics and Aignificance of Altered Porphyroclastic Lava in The Zoujiashan Uranium Deposit[J]. Science Technology and Engineering,2020,20(22):8875-8887.

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  • 收稿日期:2019-07-05
  • 最后修改日期:2020-04-15
  • 录用日期:2019-10-20
  • 在线发布日期: 2020-08-25
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