摘要
文章运用水化学和同位素水文学等手段,寻求奥陶系岩溶水硫酸盐演化过程的"指纹",通过不同含水层间水化学、稳定同位素差异的比对,分析其与上覆含水层间的水力联系和硫动力分馏过程,阐述采矿活动影响下峰峰矿区奥陶系岩溶水硫酸盐的演化过程。研究结果表明:煤矿开采后,峰峰矿区奥陶系岩溶水硫酸盐含量普遍增高,演化特征呈现多样性,存在多种硫动力分馏过程。分馏动力主要来自矿坑水和孔隙水通过导水裂隙的渗漏(越流)补给,以及脱白云石化过程中自身蒸发岩矿物(石膏)的溶解。
Increases in the concentration of sulfate in water from an Ordovician karst aquifer following mining activity pose a major hazard to drinking water safety.Therefore,research into the impact of mining activities on the sulfate concentration is very significant.Hydrochemistry,isotope hydrology and other methods were adopted.Hydraulic connection and sulfur kinetic fractionation processes were investigated in order to evaluate sulfate changes in the Ordovician karst aquifer due to mining activity.Fengfeng coal mine is located in the southeast of Taihang Mountain,which is next to Jiu mountain in the west,and North China Plain in the east,with a total area of 340.6km2.Based on the characteristics of the water bearing rock,aqueous medium and burial conditions,the main aquifers are,Cambrian oolitic limestone karst fracture aquifer,Ordovician fracture karst aquifer,Taiyuan Carboniferous thin limestone fractured aquifer,Permian Shanxi formation sandstone fissure pore aquifer and Quaternary alluvial slope of aeolian sandy soil pore aquifer.The Ordovician fracture karst aquifer is the most important aquifer,with a total area was2,404km2 in the mine.The aquifer matrix is composed of brecciated limestone,mottled limestone,limestone and marlite,gypsum,etc,and the total aquifer thickness is 470 to 584m.The results indicate that the sulfate concentration in the groundwater of the Ordovician karst aquifer increased after mining activities,with different characteristics and sulfur kinetic fractionation process.The main source of kinetic fractionation was groundwater seepage from pits and pore water flowing through fractures,and the ability of minerals in evaporate to dissolve had been enhanced during the de-dolomitization process.The results are useful for evaluating the evolution of sulfate in karst water in areas with similar mining activity,protecting karst water resources,and improving the management of coal resource development.
出处
《中国岩溶》
CAS
CSCD
2014年第4期425-431,共7页
Carsologica Sinica
基金
国家级地质环境监测与预报专项(项目编号:1210800000022-6)
资源城市地下水基础环境状况调查与评估(项目编号:2011A113)
关键词
同位素
硫酸盐
水力联系
岩溶地下水
采煤活动
isotope
sulfate
hydraulic connections
karst groundwater
mining activities
