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矿床地质  2010 

粤北地区302矿床沥青铀矿的形成时代、地球化学特征及其成因研究

Keywords: 地质学,沥青铀矿,U-Pb和Sm-Nd等时线年龄,Nd模式年龄,铀矿床,粤北

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Abstract:

302铀矿床位于诸广山岩体东南部,是中国花岗岩型铀矿床中规模较大、埋藏较深的矿床。研究表明,沥青铀矿的U_Pb和Sm_Nd等时线年龄分别为(68.7±2.7)Ma和(70±11)Ma,与华南花岗岩型铀矿床的主成矿期一致。沥青铀矿低的εNd(t)值(-11.3~-13.1)、古老的Nd模式年龄(1.76~1.88Ga)以及它们的微量元素和稀土元素组成都与赋矿围岩油洞岩体,尤其长江岩体十分相似,表明铀源可能主要来源于赋矿花岗岩体,尤其是长江岩体。

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