焦家矿区深部岩矿石稀土元素特征及地球化学意义

REE Characteristics and Geochemical Significance of Rock in the Depth of Jiaojia Gold Deposit

焦家金矿是胶东西北部地区蚀变岩型金矿的典型代表之一,也是"焦家式金矿"模式建立之处。尝试对焦家矿区深部岩矿石稀土元素地球化学特征进行初步探讨,力求揭示焦家成矿带深部蚀变矿化特征与稀土元素分布模式之间的内在联系,对丰富和完善焦家金矿成矿理论无疑是有所裨益的。其稀土元素丰度较低,表现为轻稀土富集、重稀土亏损及正铕异常;不断增强的蚀变作用使轻稀土含量降低、正铕异常消减直至出现负铕异常。

Jiaojia Gold Mine is a typical gold deposit of alteration rock type in the northwest of Jiaodong area,which is the first place to establish Jiaojia Gold Mine model.The authors try to take a preliminary discussion on REE geochemistry of rock in the depth of Jiaojia gold mine,strive to reveal the internal relationship between alteration mineralization characteristics and distribution patterns of REE in the depth of Jiaojia metallogenic belt.And it is undoubtedly beneficial to enrich and improve the metallogenic theory of Jiaojia gold deposit.The relatively low REE abundances in rocks reveals LREE enrichment,HREE depletion,and positive Eu anomaly.Growing alteration effect makes LREE decrease,and positive Eu anomaly cut until negative Eu anomaly.