鲁东塔埠头稀土矿成矿地质特征及找矿前景分析

Analysis on Metallogenic Geological Characteristics and Prospecting Prospect of Tabutou Rare Earth Deposit in Eastern Shandong Province

塔埠头稀土矿是山东省内一处典型的伟晶岩型稀土矿,其成矿与区内构造和燕山晚期笔架山单元伟晶不等粒花岗岩关系密切。塔埠头稀土矿区成矿地质条件较好,放射性异常突出,圈定航放异常10个,地面放射性综合异常4个;并圈定有La、Y、Th、Yb、Zr、Nb、Be等元素地球化学异常和钍石等重砂异常。塔埠头稀土矿发现矿体7个,矿体呈脉状,赋存在花岗伟晶岩带中,稀土矿物主要为褐帘石和氟碳铈镧矿,其次有锆石、榍石和钍石等。脉石矿物有斜长石、钾长石、石英、黑云母等。矿石中稀土元素以轻稀土Ce、La、Nd、Pr、Sm等元素为主,重稀土元素含量很少,因此本稀土矿为轻稀土矿。矿石为中粗粒-伟晶结构,块状构造。矿石工业类型为伟晶岩型。矿石自然类型可分为五大类7个矿石类型;矿石中稀土元素以氧化物状态存在。该稀土矿找矿标志明显,找矿前景较好。

Tabutou rare earth deposit is a typical pegmatite type rare earth deposit in eastern Shandong province.Its mineralization is closely related to the structures and pegmatite unequal granites in Bijiashan unit in late Yanshan period.The metallogenic geological conditions of rare earth in Tabutou area are good,and the radioactive anomalies are prominent.There are 10 delineated radiological anomalies and 4 surface radiation comprehensive anomalies.Geochemical anomalies,such as La,Y,Th,Yb,Zr,Nb and Be,heavy sand anomalies,such as thoriite have been delineated.Seven orebodies have been found in Tabutou rare earth deposit.They are vein shaped and occur in granitic pegemite belt.The rare earth minerals are mainly epidote and bastenium lanthanide,followed by zircon,sphene and thoriite.Gangue minerals are plagioclase,potassium feldspar,quartz and biotite.Rare earth elements in the deposit are mainly light rare earth elements,such as Ce,La,Nd,Pr and Sm,while the contents of heavy rare earth elements are very low.Therefore,this deposit is a light rare earth deposit.The ore bodies are medium coarse grain pegmatite structures and massive structures.The industrial type of ore is pegmatite.Natural ore types can be divided into five categories and seven ore types.Rare earth elements in ores exist as oxides.This rare earth deposit has obvious prospecting sign and good prospecting prospect.