广德新岭轻稀土矿床地球化学特征及控矿因素  

The Ore-controlling Factors and Geochmistrical Characteristics of Rock-body of LREE Deposit in Guangde Xinling Area

作　　者：王西荣[1,2] 邹德炜 张落毅 李绍侠 田家鹏 

机构地区：[1]东华理工大学地球科学学院,江西南昌330013 [2]安徽省地矿局安徽省地质实验研究所,安徽合肥230001 [3]南京大学资源环境与城市建筑规划系,江苏南京210032

出　　处：《稀土》2017年第5期56-67,共12页Chinese Rare Earths

基　　金：安徽省地矿局地调基金项目(DD20120426)

摘　　要：离子吸附型稀土矿床是一个具有显著经济价值的矿床。安徽省广德县新岭稀土矿产于北纬30°以北地区,它是一个以轻稀土矿富集为主,有异于南方以重稀土为主的新型矿床。通过采集样品,运用XRF、电感耦合等离子质谱仪ICP-MS测试方法,进行主微量与稀土元素分析测试。主量元素表明,刘村岩体是一个源自于深源的玄武质熔浆,受壳源混染作用形成花岗闪长岩;微量元素中高强场小半径的离子如Th、U和稀土元素趋于富集;稀土配分型式呈明显右倾的"V"型,(La/Yb)N7.30,δEu 0.31,δCe 1.47。据稀土元素与微量元素的相关分析得知:铈族稀土元素与Th、Nb、Ta、Zr、Ba、Be、P、Ni、Cu、Fe的相关系数较大,与W为负相关;钇族稀土元素与Ba、Cd、In、Co、Zn、W关系密切,与其它多为负相关关系。与赣南地区离子吸附型稀土矿床比较,两者∑REE、LREE/HREE、(La/Yb)N、δEu、δCe存在差异。新岭稀土矿化产于刘村花岗闪长岩体风化壳全风化层内,稀土矿物主要以铈族矿物为主,含少量钇族类矿物。氧化稀土平均品位为0.055%,矿石中LREE/HREE为3.79,属于轻稀土类型。矿石组分有独居石、褐帘石、少量磷钇矿等。控矿因素是含矿母岩体和地形、地貌条件。The ion - adsorption type rare earth deposits developed in weathering crust are of significant economic values. Xinling rare earth deposit is located in 30 degrees north latitude, Guangde County, Anhui Province, China, which is a new deposit mainly riched in light rare earth element, and it is different from those enriched heavy REE deposits from South China. Through collecting samples, both main and trace elements and REE have been measured by using XRF and ICP - MS test methods. The characteristics of main elements indicate that Liucun rock mass is a granodiorite - body which was derived from the deep source of the earth by the mixing with the crust material. Among the trace elements those ions of high strength field and small radius such as Th, U and rare earth elements tend to be enriched. The REE patterns have shown obvious ＂V＂ type curves inclining gently to the right. （La/Yb） N = 7.30, ∑Eu = 0.31, 8Ce = 1.47. According to the correlation analysis of the REE and trace elements, the correlation coefficients between Ce group elements and Nb, Ta, Zr, Ba, be, P, Ni, Cu, Fe are larger. The yttrium group elements are closely related to Ba, Cd, In, Co, Zn, W, but negatively related to others trace elements. Compared with Xinling REE deposits and ion adsorption type REE deposits in Gannan region there exist some obvious differences in ∑ REE, LREE/HREE, （La/Yb） N, Eu, Ce. The Xinling REE deposit was formed in the whole weathered lay- er within the weathered crust of Liucun granodiorite. REE＇ s minerals consist of mainly Ce group minerals and less Yb group minerals. The average grade of the oxidized REE is 0.055%, and the LREE/HREE is 3.79 in the ore. It indicates that the Xinling REE deposit belongs to LREE＇ s type. Ore＇ s components have monazite, allanite and a little mount xenotime etc. Factors of controlling ore have the parent rock mass and conditions of topography and landform.

关 键 词：含矿母岩 离子吸附型稀土矿床 轻稀土元素 配分型式 控矿因素 

分 类 号：P595[天文地球—地球化学] P618.91[天文地球—地质学]