广西大厂铜坑锡多金属矿床矿石稀土元素特征及其地质意义

铜坑锡多金属矿是广西大厂矿田中具代表性的超大型矿床,由上部的锡多金属矿和下部的锌铜矿组成。区内矿化具有"上锡下铜、近铜远锡"的分带特征和上脉下层的矿体产出规律。文章对区内不同类型矿体的矿石进行系统的稀土元素测试,结果显示不同类型矿石稀土总量具有规律性变化特征,稀土配分模式均表现为轻稀土富集、铕铈不同程度亏损的右倾配分曲线,结果表明上部的锡多金属矿体和下部的锌铜矿具有相同的物质来源。通过对矿区侵入岩稀土元素特征对比研究,表明区内成矿与龙箱盖花岗岩有关,成矿物质是自东向西、由下至上、由近花岗岩到远离花岗岩运移的,矿床成因应属于岩浆热液充填—交代型。

Ore REE characteristics and its geological significance of Tongkeng tin polymetallic deposit, Dachang,Guangxi

Tongkeng tin polymetallic deposit is one of the most representative super-large deposits in guangxi dachang mine field. The mineralization in this area has the zonal characteristics of "copper under upper tin, copper near and tin far" and the ore body output rule in the lower part of upper vein. In this paper, the area of rare earth elements of different types of ore body system of ore for the test, the results show that rare earth ore types has regular change characteristic, total rare earth distribution patterns are characterized by enrichment of light rare earth cerium, europium, different degree of loss of the right distribution curve, showed that the upper tin polymetallic ore body and lower source of zinc, copper with the same material. Through the comparative study of the characteristics of the rare earth elements in the intrusive rocks in the mining area, it is shown that the mineralization in the area is related to longxinggei granite, the mineralization material is transported from east to west, from bottom to top, from near granite to far granite, and the genesis of the deposit should belong to the magmatic hydrothermal filling and metasomatism type.