李杰;黄宏业;刘子杰;张涛;陈琪;邹明亮;

• 1:核工业二三○研究所

摘要(Abstract)：

向阳坪矿床作为苗儿山矿田近年来新发现的花岗岩型铀矿床,发育大量原生沥青铀矿脉。为了进一步厘清铀矿床铀成矿年龄体系,采用LA-ICP-MS测试技术,对钻孔中揭露的脉状沥青铀矿开展了微区原位U-Pb同位素定年及稀土元素特征研究。LA-ICP-MS分析结果显示,向阳坪地区存在2期铀矿化,U-Pb年龄为51.59 Ma和41.10 Ma,前者为向阳坪矿床主成矿年龄,后者为后期流体活动导致沥青铀矿蚀变的热事件时间,分别与沙子江矿床主成矿期65～50 Ma、45～40 Ma相吻合。沥青铀矿稀土元素特征表明,稀土元素总量相对较高,具有明显的负Eu异常,其配分模式呈海鸥型,与低-高品位铀矿石的稀土元素配分模式相似,而与新鲜花岗岩、蚀变花岗碎裂岩的"右倾型"相区别。沥青铀矿稀土元素与铀元素的迁移具有同步性,为低温下晶出沉淀的产物。

关键词(KeyWords)： 沥青铀矿;LA-ICP-MS;稀土元素;向阳坪

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41702102);; 中国核工业集团有限公司项目(3210402)

作者(Author): 李杰;黄宏业;刘子杰;张涛;陈琪;邹明亮;

Email:

DOI: 10.19509/j.cnki.dzkq.2021.0011

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