不磨金矿床稀土元素地球化学特征及其意义

通过分析海南不磨金矿床不同地质体的稀土地球化学特征，发现从花岗岩脉、花岗碎裂岩、片岩到金矿体再到石英岩脉，稀土总量有逐渐降低的变化规律，花岗岩脉、花岗碎裂岩、片岩和金矿体的稀土元素配分模式相似，表明金矿体与花岗岩脉、花岗碎裂岩、片岩在漫长的地质演化过程中具有一定的继承性，互相之间具有密切的成岩成矿关系；而下地壳源的石英岩脉与矿区其他地质体的稀土配分模式曲线相差较大，为成矿过程提供了热源。中元古界抱板群在后期的变质过程中，使得元素活化、迁移，为矿床的形成提供了物质来源，抱板群成为金矿床的矿源层；后期花岗岩脉是抱板群岩石在地壳深部经部分熔融而形成。

Geochemical Characteristics and Significance of REE in Bumo Gold Deposit

Based on analysis of the REE′s geochemistry characteristics of different geological bodies in Bumo gold deposit，it is found that ∑REE decrease gradually form granitic vein，cataclastic rock，schist，gold ore bodies to quartzitic veins，and the REE distribution pattern of them is similar except quartzitic veins.It shows that granitic vein，cataclastic rock，schist and gold ore bodies has a certain inherited evolution characteristics and a closely mineralization relationships each other during the long geological process.However the REE distribution pattern curve of quartzite veins in lower crustal source is different from others，which provides a heat source for the mineralization.The mesoproterozoic Baoban group in the latter part of the metamorphic process causes the activation，migration of elements，providing the source material for the formation of gold deposits，and the Baoban group becomes source layer of gold deposit ore.The late granite veins are formed by partially melting the Baoban Group rocks in the deep crust.