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矿床地质  2002 

宁芜玢岩铁矿磷灰石的稀土元素特征

Keywords: 玢岩铁矿,磷灰石,稀土元素组成,不混溶矿浆,宁芜

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Abstract:

文章分析了宁芜玢岩铁矿4种产状磷灰石的稀土元素组成,并与Kiruna型铁矿和斜长岩、苏长岩及钛铁霞辉岩中磷灰石的稀土元素组成进行了对比。结果表明产地和母岩不同的矿床中,它们的磷灰石稀土元素分布型式一致,以轻稀土富集和Eu负异常明显为特征,属陆相岩浆成因。前3种产状磷灰石的∑REE变化于3031.48×10-6~12080×l0-6,第4种产状磷灰石的∑REE仅为l958×10-6,反映岩浆演化到热液的晚期阶段成矿溶液稀土元素含量较低。尽管辉长闪长玢岩与磷灰石的稀土元素分布型式一致,但辉长闪长玢岩无Eu异常或有弱Eu正异常代表它们的地幔源区低氧逸度的还原环境或反映氧逸度较高情况下的分离结晶作用。不混溶作用形成的矿浆在冷凝过程中,Eu2+。优先被透辉石捕获,使得稍晚结晶的磷灰石产生负Eu异常。

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