甘南千吨黄金基地深部地下水循环机理研究——以拉古河矿区为例  

Study on deep groundwater circulation mechanism of Gannan thousand ton gold base——Take the Lagu River mining area as an example

作　　者：文静 黄小龙 胡彦斌 姜建旭 WEN Jing;HUANG Xiao-long;HU Yan-bin;JIANG Jian-xu(Hydro-geology Engineering Geological Survey Institute,Gansu Bureau of Geology and Mineral Resources Exploration and Development,Lanzhou 730022,China)

机构地区：[1]甘肃省地质矿产勘查开发局水文地质工程地质勘察院,甘肃兰州730022

出　　处：《地下水》2024年第6期85-88,258,共5页Ground water

摘　　要：甘南地区自北向南分布多金属成矿带,金的成矿地质条件良好,资源潜力巨大,为研究甘南地区深部地下水形成、分布及循环规律,以甘南州夏河县拉古河矿区为例,综合拉古河矿区的水文地质调查成果,利用水化学和同位素技术手段,结合地下水动态观测,分析研究区内大气降水、地表水与地下水之间的水力联系,总结研究区地下水分布特征及循环模式。结果表明:研究区主要水体为地表水、第四系地下水及三叠系基岩裂隙水三类,主要补给源为大气降水,地表水与第四系地下水,水力联系密切,相互补给;基岩裂隙水的循环更新能力较弱,其与地表水、第四系地下水之间水力联系较弱。矿区内深部基岩裂隙水的径流方向大致为由南至北,该径流方向与海拔、沟谷发育方向、地表水和第四系地下水的径流方向基本一致;研究区排泄途径主要为蒸发蒸腾,随地形地势由高向低处径流,最终以地表、地下侧向径流的形式排泄于下游沟谷中。研究结果为客观评价、合理利用和科学管理矿区地下水资源以及防治水灾害提供参考。Poly-metallic metallogenic belt is distributed from north to south in Gannan region,with favorable geological conditions for gold mineralization and huge resource potential.In order to study the formation,distribution and circulation of deep groundwater in Gannan region,taking Laguhe mining area in Xiahe County,Gannan Prefecture as an example,the hydro-geological survey results of Laguhe mining area were integrated,hydro-chemical and isotope techniques were used,and groundwater dynamic observation was combined.The hydraulic relations among atmospheric precipitation,surface water and groundwater in the study area were analyzed,and the distribution characteristics and circulation patterns of groundwater in the study area were summarized.The results show that:The main water bodies in the study area are surface water,quaternary groundwater and Triassic bedrock fissure water.The main recharge source is atmospheric precipitation.Surface water and quaternary groundwater are closely related to each other.The circulation and renewal ability of bedrock fissure water is weak,and the hydraulic relation between bedrock fissure water and surface water and quaternary groundwater is weak.The runoff direction of deep bedrock fissure water in the mining area is roughly south to north,which is basically consistent with the runoff direction of elevation,gully development,surface water and quaternary groundwater.The main drainage route in the study area is evapotranspiration,which changes from high to low with the topography,and finally drains into the downstream gully in the form of surface and underground lateral runoff.The research results provide reference for objective evaluation,rational utilization and scientific management of underground water resources in mining areas and prevention and control of water disasters.

关 键 词：深部地下水 分布特征 循环规律 水力联系 地下水循环模式 

分 类 号：P641.2[天文地球—地质矿产勘探]