东天山雅满苏铁矿床稀土元素地球化学示踪

Tracing of Rare Earth Element Geochemisty of the Yamansu Iron Deposit in East Tianshan

雅满苏铁矿是阿奇山-雅满苏岛弧带中的中型矿床,赋存于雅满苏组上亚组第三岩性段下部的玄武质晶屑凝灰岩、火山角砾岩、集块岩及灰岩中,近矿围岩以矽卡岩为主,矿体呈似层状、层状。对该矿床矽卡岩和磁铁矿进行稀土元素地球化学研究表明,矿区围岩稀土元素分布曲线为轻稀土元素相对富集的右倾型,具弱的Eu正异常,无明显Ce异常,说明其形成于氧化环境,成矿过程无海水的加入。部分样品显示出复杂的稀土元素特征,暗示成矿过程复杂,可能为火山热液为主的复合成因矿床。

The Yamansu iron deposit is a medium iron deposit of the Aqishan-Yamansu island arc belt. The ore bodies are hosted in the basaltic crystal tuff,volcanic breccia,agglomerate and limestone of the subgroup Yamansu Formation. The orebodies in the deposit occur as beds and lenses,the main wall rocks are skarn,studying the REE geochemical of skarn and magnetite ore in this paper,The results show that most REE patterns in wall rocks is relatively and are enriched in light REE with a weak Eu positive anomaly and no obvious Ce anomaly,indicating that it is formed in an oxidizing environment,and the mineralization process does not add obvious seawater;but some samples showed complex REE,suggesting that the complexity of their mineralization process ,Maybe the Yamansu iron deposit is a Compound Cause deposit of Volcanic hydrothermal.