煤矿区地下水稀土元素地球化学特征:以皖北许疃矿为例

发布时间：2018-05-27 00:15

  本文选题：稀土元素 + 地球化学　； 参考：《中国稀土学报》2017年02期

【摘要】：为了解煤矿区地下水稀土元素地球化学特征,采集了许疃煤矿3个含水层水样,进行常规离子和稀土元素测试,探讨了稀土组成及元素异常特征,结果表明:许疃矿3个含水层呈碱性,pH值平均为8.7,地下水中阴离子以HCO_3~-为主,阳离子以K~++Na~+为主。Ca~(2+)和Mg~(2+)含量在灰岩水中最大,Na~++K~+浓度在煤系水中最高。地下水中稀土总量偏低(∑REE=0.023~0.251μg·L~(-1)),经后太古宙平均页岩标准化,表现为轻稀土亏损,重稀土富集,所有样品均表现为明显的Eu正异常,多数样品表现为Ce和Y负异常;这些特征受到多种因素控制,其中Ce负异常受到地下水pH值影响,而Eu异常受长石类矿物溶解的影响,Y负异常和较低的Y/Ho值与Ca~(2+)浓度密切相关,受到围岩作用的影响。这些特征及影响因素表明利用稀土元素特征进行矿井水源识别具有一定的可行性。
[Abstract]:In order to understand the geochemical characteristics of rare earth elements in underground water in coal mining area, three aquifer water samples of Xutuan coal mine were collected, the conventional ions and rare earth elements were tested, and the composition and anomalous characteristics of rare earth elements were discussed. The results show that the average pH value of the three aquifers in Xutuan Mine is 8.7. The main anions in the groundwater are HCO _ 3N ~ -, and the cations are K ~ (Na ~ (~ +). CaDU ~ (2) and Mg~(2). The maximum concentration of Na ~ K ~ (~ +) in limestone water is the highest in coal measure water. The total amount of rare earth elements in groundwater is low (鈭，

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