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本文在分析荥巩矿区水文地质条件的基础上,重点对岩溶地下水系统的水化学特征进行分析。结果表明:岩溶水水化学类型自补给区到排泄区,从单一的HCO3型向复杂的HCO3.SO4型和SO4.HCO3型转变,TDS和Sr2+/Ca2+值均增加。地下水氢氧稳定同位素分析结果表明,本区岩溶地下水主要接受大气降水的入渗补给。根据同位素计算的补给高程推断岩溶水补给范围和划分的流动系统与地面调查结果及水化学研究成果一致:矿区处于区域流动系统排泄带,中寒武统张夏组—中奥陶统灰岩在矿区南部出露的范围接受降水补给,以侧向径流的方式进入矿区充水含水层。
Based on the analysis of hydrogeological conditions in Gonggong mining area, this paper mainly analyzes the hydrochemical characteristics of karst groundwater system. The results show that the KDS values of karst water from the recharge area to the discharge area increase from the single HCO3 type to the complex HCO3. SO4 and SO4. HCO3 transitions. The results of stable oxygen and stable isotope analysis of groundwater show that the karst groundwater in this area is mainly recharged by the infiltration of atmospheric precipitation. According to isotope-calculated recharge elevations, it is concluded that the range of karst water supply and the division of the flow system are consistent with the results of the ground survey and water chemistry research: the ore district is located in the extinction zone of the regional flow system, the middle Cambrian Zhangxia Formation-Middle Ordovician limestone The area exposed in the southern part of the mining area receives precipitation recharge and enters the water-filled aquifer in the mining area in a lateral runoff manner.