基于水化学、锶同位素特征的会宝岭矿床深部地下水来源分析

Analysis of Deep Groundwater Source in Huibaoling Deposit Based on Hydrochemistry and Strontium Isotope Characteristics

摘要:

为揭示会宝岭铁矿深部地下水的补给来源及演化过程，更好地指导矿井深部水害防治工作，本研究选用水化学类型、锶同位素含量、地下水Durrov图、87Sr/86Sr与Sr2+含量的关系图、87Sr/86Sr与rMg2+/（rMg2++rCa2+）关系图相结合的分析方法，揭示了深部地下水的补给来源、水化学组分形成机制及水—岩作用演化过程。研究结果表明：深层裂隙水以硅铝质盐岩（变质岩）为主的径流特征，其在变质岩地层中径流缓慢，溶解、溶滤作用得以充分进行，有别于浅层裂隙水、岩溶裂隙水显示出的灰岩和硅铝质盐岩（泥质砂岩）的径流特征，受上部的浅层地下水补给微弱，为以静储量为主的地下水；断层水主要上部受沉积岩地下水（浅层裂隙水和岩溶裂隙水）的补给，在沿着断层破碎带径流时具有与深层裂隙水相同的水—岩作用。

Abstract:

In order to reveal the source and evolution process of groundwater recharge in the deep part of Huibaoling iron deposit and better guide the prevention and control of water hazards in the mine, by using a combination analysis method of hydrochemical types, strontium isotope content and groundwater Durov diagram, 87Sr/86Sr and Sr2+content relationship diagram, rMg2+/(rMg2++rCa2+) and Sr2+ content relationship diagram, the source of groundwater recharge, the formation mechanism of hydrochemical components and the evolution process of water rock interaction in the deep part of the mine have been revealled. It is indicated that the runoff characteristics of deep fissure water are mainly composed of silicate aluminum salt rock (metamorphic rock). Its runoff is slow in metamorphic rock formations, and its dissolution and filtration processes are fully carried out. Unlike the runoff characteristics of limestone and silicate aluminum salt rock (mudstone sandstone) displayed by shallow fissure water and karst fissure water, it is weakly replenished by shallow groundwater in the upper part and is mainly composed of static groundwater. Fault water is mainly supplied by sedimentary rock groundwater (shallow fissure water and karst fissure water) in the upper part, and has the same water rock interaction as deep fissure water when flowing along the fault fracture zone.