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桂北向阳坪铀矿床矿石矿物LA-ICP-MS原位稀土元素地球化学特征及其对成矿流体的制约
In situ micro-determination on ore-bearing minerals, geochemical characteristics of REE and their constraints on ore-forming fluids in the Xiangyangping uranium deposit, northern Guangxi
投稿时间:2019-12-11  
中文关键词:稀土元素  LA-ICP-MS原位分析  沥青铀矿  铀黑  成矿流体  向阳坪铀矿床
英文关键词:REE  LA-ICP-MS in situ analysis  pitchblende  oxidized pitchblende  ore-forming fluid  Xiangyangping uranium deposit
基金项目:国家自然科学基金项目(41702102);中国核工业集团有限公司项目(3210402);中国核工业集团有限公司菁英项目;中国核工业地质局项目(201917,201918)
作者单位E-mail
张涛 核工业二三〇研究所, 湖南 长沙 410011  
黄宏业 核工业二三〇研究所, 湖南 长沙 410011  
李杰 核工业二三〇研究所, 湖南 长沙 410011  
刘子杰 核工业二三〇研究所, 湖南 长沙 410011  
陈琪 核工业二三〇研究所, 湖南 长沙 410011  
邹明亮 核工业二三〇研究所, 湖南 长沙 410011 zoumingliang2001@163.com 
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中文摘要:
      向阳坪铀矿床是桂北苗儿山地区最具代表性的花岗岩型铀矿床,对该矿床矿石矿物REE开展了微区原位研究并结合前人研究成果进行了综合分析,表明铀黑∑REE介于689.12×10-6~869.31×10-6之间,LREE相对富集,HREE相对亏损,具强Eu负异常及Ce正异常,TE1,3值介于1.26~1.33之间,具典型M型四分组效应;沥青铀矿∑REE介于569.73×10-6~3 373.83×10-6之间,表现出两种特征:① LREE富集,HREE亏损,轻重稀土元素分馏程度较大,具强Eu负异常和弱Ce正异常,配分曲线呈右倾型;②轻重稀土元素分馏程度较小,Eu负异常明显,弱Ce负异常,配分曲线呈海鸥型。围岩稀土元素配分模式相似,Y/Ho值范围狭窄,指示具有相同物源;矿石矿物稀土元素与围岩存在较大差异,亲缘性不明显。成矿作用伴随围岩发生蚀变及围岩高铀背景;成矿流体具多阶段、富U-Y-REE特征,铀主要来自深部热液,围岩贡献不显著;矿床定位受构造-岩体联合控制,矿体规模、形态受构造规模、产状控制。
英文摘要:
      The Xiangyangping uranium deposit is the most representative granite-type uranium deposit in the Miao'ershan area of northern Guangxi. Based on the detailed field investigation, the main uranium mineral in the deposit is pitchbiende. LA-ICP-MS REE research dissects the source of ore-forming fluids. The results show that oxidized pitchblende ∑REE is 689.12×10-6~869.31×10-6, LREE is relatively enriched, HREE is relatively deficient, strong Eu is negative and Ce is positive, TE1,3 values range from 1.26 to 1.33, with a typical M type REE tetrad effect; the ∑REE of the pitchblende is 569.73×10-6~3 337.83×10-6, showing two characteristics:① LREE enrichment, HREE loss and LREE and HREE fractionation degree are large, Eu exhibits strong negative anomaly but weak Ce positive anomaly, and chondrite-normalized REE patterns are right-included; ② LREE and HREE fractionation degrees are small, Eu negative anomaly is obvious, Ce negative anomaly is weak, and the chondrite-normalized patterns of REE are in seagull type form. The fresh rock has similar chondrite-normalized REE patterns, and the Y/Ho ratio range is narrow, indicating that it has the same material source. REE of ore minerals are quite different from the values of the fresh rocks, and the kindship is not obvious. The alteration and high uranium background is a product of the mineralization. The ore-forming fluid is multi-stage rich in U-Y-REE. The uranium mainly cane from deep hydrothermal fluid, and the contribution of fresh rock is not significant. The location of the deposit is controlled by the combination of tectonic and rock mass. The size and shape of the orebody are determined by the tectonic scale and modes of occurrence.
张涛,黄宏业,李杰,刘子杰,陈琪,邹明亮,2020,桂北向阳坪铀矿床矿石矿物LA-ICP-MS原位稀土元素地球化学特征及其对成矿流体的制约[J].岩石矿物学杂志,(4):423~440.
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