同位素在判断地下水来源方向中的应用研究  

Application study of isotopes in determining the Orientation of groundwater source

作　　者：刘乐军 解英芳 曲洪飞 LIU Le-jun;XIE Ying-fang;QU Hong-fei(the sixth institute of geology and mineral exploration of shandong province,weihai 264200,China)

机构地区：[1]山东省第六地质矿产勘查院,山东威海264200

出　　处：《地下水》2020年第3期23-25,65,共4页Ground water

摘　　要：焦家金矿多年水质资料显示:随着开采深度增加,矿坑水TDS值呈现增加趋势,矿山巷道内部分涌水点水质指标成倍于浅部含水层,个别突水点涌水量多年稳定在80 m^3/h左右,TDS值达到或超过14. 8 g/L。高矿化度水的来源在以往矿产勘查报告中解释为古岩相封存水,报告结论是“矿坑水与海水没有明显水力联系”。但是,矿山开采几十年,高矿化度突水点也被揭露十多年了,古岩相封存水经过长期释放应该水压降低,流量减少,基岩含水层(蚀变花岗岩或变辉长岩内的裂隙)地下水静储量也不会太多,除非有稳定水头,才能维持突水点流量稳定。难道海水成为它们的补给源?不经过深入研究,仅凭“水咸”和矿化度高这些“证据”,无法得出矿坑水与海水有水力联系的结论。近几年,Cl^-同位素在水文地质学的应用为解决疑问提供了较好的思路与方法。利用37Cl作为海水侵入示踪剂,确认海水与矿坑水是否存在水力联系以及联系程度,正确认识矿坑充水因素,将焦家金矿床矿坑充水因素矢量化,对矿床深部勘查过程中矿坑涌水量预测具有指导意义。Many years of water quality data of jiaojia gold mine:With the increase of mining depth,the TDS value of mine water shows an increasing trend.The water quality index of some water inrush points in the mine roadway doubles that of the shallow aquifer.The water inrush amount of some water inrush points has been stable at about 80 m3/h for many years,and the TDS value reaches or exceeds 14.8g/l.The source of high salinity water has been explained in the previous mineral exploration reports as paleolithofacies sequestration water,The report concludes that there is no clear hydraulic link between pit water and seawater.However,mining for decades,high salinity water inrush point has been exposed for more than a decade,ancient lithofacies sealed water after long-term release should be reduced water pressure,flow,Bedrock aquifers(fissures in altered granite or gabbro)do not have much static groundwater reserves,unless there is a stable head,to maintain a stable water inrush point flow.Is the sea their source of supply Without further study,it is impossible to draw a conclusion that there is a hydraulic relationship between mine water and seawater based on the evidence of high salinity and salinity.In recent years,the application of Cl-isotope in hydrogeology has provided a better way to solve the problem.Using 37 Cl as a seawater intrusion tracer to confirm whether there is a hydraulic connection and the degree of connection between seawater and pit water,correctly understand the factors of pit water filling,and vectored the factors of pit water filling in jiaojia gold deposit,which is of guiding significance to the prediction of pit water inflow in deep exploration of the deposit.

关 键 词：焦家金矿床 37Cl同位素 矿坑水 地下水来源方向 

分 类 号：P641.3[天文地球—地质矿产勘探]