黑龙江省自然金的稀土元素含量特征

CHARACTERISTICS OF REE CONTENT OF NATIVE GOLD HEILONGJIANG PROVINCE

对黑龙江省８４个砂金样品及７个岩金样品，用等离子质谱仪分析了它们的稀土元素含量。岩金以稀土总量低，轻重稀土分离程度小为特征，不同类型岩金矿床的自然金，其稀土配分曲线有明显差异。砂金样品则以较富集轻稀土为特征，稀土元素含量继承了岩金的部分特点。自然金稀土元素的赋存状态为Ｕ、Ｔｈ矿物的微细包体，其分配特点可用来讨论岩金矿床的分类以及砂金的原生来源。

The REE contents of 84 placer gold samples and 7 hard rock gold samples in Heilongjiang province are determined by plasma mass spectrographic analysis.The hard rock gold are characterized by low total REE content and low fractional degree between light REE and heavy REE.Native gold from different type of hard rock gold deposits have different REE partition diagrams.Placer gold samples are rich in light REE,the characteristics of REE contents of which partly inherited from hard rock gold.REE occur in U Th containing minerals as micro inclusion in native gold,the partition characteristics of which can be used to discuss the classification of hard rock gold deposits and the primary source of placer gold.