江西宁都坎田萤石矿床稀土元素地球化学特征及其指示意义
投稿时间:2022-01-14  修订日期:2022-03-21  点此下载全文
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游超) 中国地质大学武汉地质调查研究院 430074
王春连 中国地质科学院矿产资源研究所 
刘殿鹤) 中国地质科学院矿产资源研究所 
余小灿) 中国地质科学院矿产资源研究所 
颜开) 中国地质科学院矿产资源研究所 
刘思晗) 中国地质科学院矿产资源研究所 
周博文) 中国地质科学院矿产资源研究所 
基金项目:中央型公益性科研院所基本科研业务费专项(编号:KK2005)、中国地质调查局地质调查项目(编号:DD20190816;DD20190606)
中文摘要:赣南地区萤石资源丰富,坎田萤石矿位于赣南地区的兴国-宁都萤石成矿带上,矿体赋存于晚侏罗世黑云母花岗岩内。本文结合研究区的区域地质背景,对江西宁都坎田萤石矿床的萤石及围岩进行了稀土元素地球化学特征研究,以探讨坎田萤石矿床的成矿流体来源和矿床成因。其研究结果表明,萤石的稀土元素总量为34.11×10-6~78.12×10-6,属于轻稀土富集型,形态基本一致;围岩的稀土元素总量为94.14×10-6~175.72×10-6,其配分模式与萤石具有相似同步性。所有的萤石均显示出强烈的负Eu异常特征,指示该萤石矿床沉淀时成矿流体为温度低的还原环境。通过研究区萤石矿的地质背景、稀土元素特征以及Y/Ho -La/Ho、Tb/Ca-Tb/La关系图,结合前人在赣南地区对萤石气液包裹体进行氢氧同位素特征的研究,认为江西省宁都县坎田萤石矿属于中低温热液充填型萤石矿床。成矿物质Ca和F元素来自于大气降水对燕山早期的黑云母花岗岩的淋虑和萃取。同时,震旦系地层也可能为萤石成矿提供Ca元素。
中文关键词:萤石矿  稀土元素  成矿流体  矿床成因  江西宁都
 
REE geochemistry of fluorite from Kantian fluorite deposit and its geological implications in Ningdu area, Jiangxi Province
Abstract:The Kantian fluorite deposit is located in the Xingguo-Ningdu fluorite metallogenic belt in southern Jiangxi province, where fluorite resources are abundant. The orebody occurs in late Jurassic biotite granite. Based on the regional geological background of the study area, the REE geochemical characteristics of the fluorite and surrounding rock of the Kantian fluorite deposit in Ningdu, Jiangxi province were studied in order to discuss the source of ore-forming fluid and genesis of the deposit. The results show that the total REE concentrations of fluorites range from 34.11×10-6 to 78.12×10-6, the chondrite normalized REE distribution pattern is characterized by relative enrichment of LREE and they have similar distribution patterns. The total REE concentrations of wall rocks range from 94.14×10-6 to 175.72×10-6, and REE distribution patterns of fluorites and wall rocks have similar synchronization. All the fluorites have strong negative Eu anomaly, and it indicates that ore-forming fluid was in a low temperature reducing environment when fluorite deposit was precipitated. Based on the geological background, REE characteristics and Y/Ho-La/Ho、Tb/Ca-Tb/La relationship diagram of fluorite ore in the study area, combined with previous studies on hydrogen and oxygen isotope characteristics of fluorite gas-liquid inclusions in southern Jiangxi Province, it is concluded that the Kantian fluorite deposit in Ningdu County, Jiangxi Province is a medium-low temperature hydrothermal filling fluorite deposit. The ore-forming materials Ca and F are derived from the leaching and extraction of meteoric water from the early biotite granites in Yan Mountains. Meanwhile, The Sinian strata may also provide Ca element for fluorite mineralization.
keywords:fluorite ore  REE  ore-forming fluid  genesis of mineral deposit  Ningdu County, Jiangxi Province
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