宿县-临涣矿区深部含水层水循环稀土元素示踪

Tracing Ground Water Circulation in Deep Aquifers by Rare Earth Elements in Suxian-linhuan Mining Area

为了凸显稀土元素在示踪深部地下水系统水循环中的应用基础意义,以宿县-临涣矿区深部开采主要突水含水层四含、煤系、太灰与奥灰为研究示范,选取深部主要突水含水层地下水样品稀土元素地球化学参数(LREE/HREE,(La/Yb)_N,δEu,δCe,(La/Sm)_N,(Gd/Yb)_N,Eu/Sm)与常规离子(K^++Na^+,Ca^(2+),Mg^(2+),SO_4^(2-),Cl^-,HCO_3^-,CO_3^(2-))作为分析变量,开展主成分分析的对比研究,阐明了深部地下水稀土元素地球化学参数的控制因子与稀土元素分异的水文地球化学机制。从而基于矿区地质与水文地质条件概化,在矿区主要突水含水层地下水稀土元素分布与分异研究的基础上,提出了补给水源分别从近水平、近垂直与混合三种渗流路径补充相应主要突水含水层的深部地下水循环模式。研究成果为矿区深部水害防治和深部水资源保护与利用提供理论依据。

In order to give prominence to fundamental significance of rare earth elements in application of tracing ground water circulation in deep aquifers,the main inrush aquifers of deep mining such as the fourth aquifer of unconsolidated formation,the coal sandstone fissure aquifer,the Carboniferous karst aquifer of Taiyuan formation and the Ordovician karst aquifer in Suxian-linhuan mining area were taken for example,and geochemistry parameters of rare earth elements（ LREE/HREE,（ La/Yb）N,δEu,δCe,（ La/Sm）N,（ Gd/Yb）N and Eu/Sm） and conventional ions（K^＋＋Na^＋,Ca^2＋,Mg^2＋,SO4^2-,Cl^-,HCO3^-,CO3^2-） of ground water samples from the main inrush aquifers were selected as analyzing variables of principal component analysis. Through the comparative study of principal component analysis,the controlling elements of geochemistry parameters of rare earth elements and hydrogeochemical principle of fractionation of rare earth elements in deep ground water were illuminated. Moreover,based on the conceptualization of geological and hydrogeological conditions and the study of distribution and fractionation of rare earth elements in the mining area,the deep groundwater circulation pattern was put forward that the water source recharges the main inrush aquifers through three paths of nearly horizontal seepage,nearly vertical seepage and mixed seepage. The results provided theoretical basis for prevention and control of deep groundwater disasters,protection and utilization of deep groundwater resources in mining areas.