赣南上窖铀矿床萤石稀土元素地球化学特征及其源区意义
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摘要
上窖铀矿床是南岭多金属成矿带黄沙铀矿区的重要组成部分。萤石是该矿床最主要的脉石矿物之一,其形成与铀矿化密切相关。本文在详细的野外和室内岩相学观察基础上,系统的研究了该矿床中萤石的稀土元素(含部分微量元素)地球化学特征。结果表明,主成矿期紫黑色萤石的稀土元素总量变化于59.47×10~(-6)～68.97×10~(-6)之间,其球粒陨石标准化配分模式总体为轻稀土富集"右倾"型;成矿晚期浅绿色萤石的稀土元素总量变化于41.87×10~(-6)～43.12×10~(-6)之间,配分模式整体呈现"M型"四分组效应;两者均具有弱正铈异常(δCe=1.12～1.23)和较强的负铕异常(δEu=0.63～0.65)特征。明显区别于赣南-粤北地区前寒武纪基底岩石的稀土元素配分特征,而与矿区围岩、矿石的稀土元素配分模式相类似。此外,相对于矿区围岩、中国东部地壳和赣南-粤北地区前寒武纪基底岩石,紫黑色萤石中U含量明显富集,Th、Ba含量亏损。综合矿区成矿地质背景及上述元素地球化学特征认为,上窖铀矿床成矿流体源自前寒武纪基底岩石或与其进行了较为充分的水-岩相互作用的可能性较小,成矿流体以地幔流体为主,伴有部分经历了深部循环的大气水,相对于前寒武纪基底岩石而言,为一经历了深部循环的外来还原性流体。
Shangjiao uranium deposit is an important part of Huangsha uranium area in Nanling polymetallic metallogenic belt.Fluorite is one of major gangue minerals in this deposit,which is closely related with uranium mineralization. Based on the detailed field and indoor petrographic observation,a geochemical study on rare earth elements(including some trace elements) of fluorite was carried out systematically in this paper. The results show that the total REE concentrations of purple-black fluorite range from 59.47×10~(-6) to 68.97×10~(-6),the chondrite normalized REE distribution pattern is generally enriched in LREE "right-leaning" type;the total REE concentrations of light green fluorite range from 41.87×10~(-6) to 43.12×10~(-6),the chondrite normalized REE distribution pattern shows "M-type" tetrad effect;both of them have slightly positive Ce anomaly(δCe=1.12～1.23) and strong negative Eu anomaly(δEu=0.63～0.65). These features are clearly different from the characteristics of REE for Precambrian basement rocks from southern Jiangxi to northern Guangdong,but similar to the REE patterns of the surrounding rocks and ores.In addition,compared with the elemental abundance of the surrounding rock in the mining area,the crust in the East of China and the Precambrian basement rocks in the southern Jiangxi to northern Guangdong,the purple-black fluorite is enriched in U,and depleted in Th,Ba,tec. The comprehensive analysis and comparative study suggest that the ore-forming fluid in the Shangjiao uranium deposit is less likely to originate from the Precambrian basement rocks or to have an adequate water-rock interaction with them. The ore-forming fluid is dominated by mantle fluid,accompanied by a small amount of deep cycle atmospheric precipitation,compared with the Precambrian basement rocks,which is an alien reductive fluid undergoing deep circulation.
Shangjiao uranium deposit is an important part of Huangsha uranium area in Nanling polymetallic metallogenic belt.Fluorite is one of major gangue minerals in this deposit,which is closely related with uranium mineralization. Based on the detailed field and indoor petrographic observation,a geochemical study on rare earth elements(including some trace elements) of fluorite was carried out systematically in this paper. The results show that the total REE concentrations of purple-black fluorite range from 59.47×10~(-6) to 68.97×10~(-6),the chondrite normalized REE distribution pattern is generally enriched in LREE "right-leaning" type;the total REE concentrations of light green fluorite range from 41.87×10~(-6) to 43.12×10~(-6),the chondrite normalized REE distribution pattern shows "M-type" tetrad effect;both of them have slightly positive Ce anomaly(δCe=1.12～1.23) and strong negative Eu anomaly(δEu=0.63～0.65). These features are clearly different from the characteristics of REE for Precambrian basement rocks from southern Jiangxi to northern Guangdong,but similar to the REE patterns of the surrounding rocks and ores.In addition,compared with the elemental abundance of the surrounding rock in the mining area,the crust in the East of China and the Precambrian basement rocks in the southern Jiangxi to northern Guangdong,the purple-black fluorite is enriched in U,and depleted in Th,Ba,tec. The comprehensive analysis and comparative study suggest that the ore-forming fluid in the Shangjiao uranium deposit is less likely to originate from the Precambrian basement rocks or to have an adequate water-rock interaction with them. The ore-forming fluid is dominated by mantle fluid,accompanied by a small amount of deep cycle atmospheric precipitation,compared with the Precambrian basement rocks,which is an alien reductive fluid undergoing deep circulation.
引文
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