桂北摩天岭地区新村铀矿床沥青铀矿微区年代学和地球化学特征研究
王勇剑 , 庞雅庆 , 范洪海 , 章健 , 麻乾坤
地球科学 ›› 2024, Vol. 49 ›› Issue (04) : 1307 -1323.
桂北摩天岭地区新村铀矿床沥青铀矿微区年代学和地球化学特征研究
In-Situ Geochronology and Geochemistry of Pitchblende from Xincun Uranium Deposit in Motianling Area, North Guangxi
,
为深入探究桂北摩天岭花岗岩体中新村铀矿床的精确成矿时代及矿床成因,利用微区原位分析技术(SEM、EPMA和LA-ICP-MS)对主成矿期(铀-硅化型)沥青铀矿开展了详细的矿相学观察、原位U-Pb定年和化学成分分析.沥青铀矿电子探针化学定年计算得到的年龄值变化范围极大,不能准确地反映矿床的大致形成时间.LA-ICP-MS U-Pb同位素分析结果表明,新村矿床沥青铀矿含有一定量的普通铅,采用Tera-Wasserburg图解法得到一个下交点年龄为57.61±0.34 Ma(MSWD=0.97),可以代表主成矿期的矿化年龄.新村矿床沥青铀矿具有较高的WO3、CaO和极低的ThO含量,暗示成矿流体可能为富U、W的中低温成因流体;沥青铀矿稀土元素配分模式为轻稀土微富集型,整体上与赋矿花岗岩稀土配分型式相似,指示成矿物质可能来自花岗岩体本身.新获得的铀成矿年龄与桂北地区热液型铀矿的主成矿期(70~50 Ma)基本一致,表明新村矿床同华南地区绝大多数中新生代热液铀矿床一样,都是白垩纪-古近纪岩石圈伸展减薄背景之下的产物.
微区分析 / U-Pb定年 / 沥青铀矿 / 新村矿床 / 摩天岭地区 / 广西 / 矿床学
micro-area analysis / U-Pb dating / pitchblende / Xincun uranium deposit / Motianling area / Guangxi / ore deposit geology
附表见本刊官网(http://www.earth-science.net).
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中国铀业有限公司地勘项目(地D2210)
核工业北京地质研究院院长青年基金项目(地QJ2101)
广西铀矿成矿规律研究项目(地技2201)
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