Better characterization of the geochemical evolution of groundwater south of Grand Canyon, Arizona (USA), is needed to understand natural conditions and assess potential effects from breccia-pipe uranium mining in the region. Geochemical signatures of groundwater at 28 sampling locations were evaluated; baseline concentrations for select trace elements (As, B, Ba, Cr, Li, Mo, Rb, Se, Sr, Th, Tl, U, V) were established, and anomalous chemistry characteristics were identified. Concentrations at some groundwater sites exceeded the USEPA drinking water standard for As of 10 μg/L (Red Canyon, Miners, JT, Havasu, and Warm Springs) and U of 30 μg/L (Salt Creek Spring). Four springs from the study area (Blue, Havasu, Fern, and Warm Springs) had unique chemistry, which may indicate a deep flow path or potential contribution of fluids from lower in the crust. Other springs in the study area were distinguished by major anion water type: sulfate, bicarbonate, and a mixture of the two. Water type distinctions were somewhat spatially segregated, with sulfate type present on the western side of the study area, bicarbonate type on the eastern side, and a mixture of the two interspersed between the endmember sites. Sulfate-type water from this study area had low strontium isotopic ratio (⁸⁷Sr/⁸⁶Sr) values. The location of spring discharge within single drainages of the Grand Canyon may influence chemistry, as groundwater discharging from bedrock was altered after flowing through alluvial material. Geochemical analysis of groundwater in Grand Canyon indicates the importance of continued monitoring and better understanding of short-term chemical fluctuations.

需要更好地表征美国亚利桑那州大峡谷以南的地下水的地球化学演化，以了解自然条件并评估该地区角砾岩管铀矿开采的潜在影响。对28个采样点的地下水的地球化学特征进行了评估；确定了选定的痕量元素（As，B，Ba，Cr，Li，Mo，Rb，Se，Sr，Th，Tl，U，V）的基线浓度，并鉴定了异常的化学特征。某些地下水位的浓度超过了USEPA饮用水标准，达10μg/ L（红色峡谷，矿工，JT，Havasu和暖泉）和U达30μg/ L（盐溪温泉）。研究区域的四个温泉（蓝色，哈瓦苏，蕨类和暖泉）具有独特的化学性质，这可能表示深层流动路径或地壳下部流体的潜在贡献。研究区的其他泉水以主要的阴离子水类型为特征：硫酸根，碳酸氢根和两者的混合物。水的类型区分在空间上是分隔开的，研究区域的西侧是硫酸盐类型，东侧是碳酸氢盐类型，并且在端部位点之间散布了两种混合物。该研究区的硫酸盐型水锶同位素比低（两者的混合物散布在末端成员位点之间。该研究区的硫酸盐型水锶同位素比低（两者的混合物散布在末端成员位点之间。该研究区的硫酸盐型水锶同位素比低（⁸⁷ Sr / ⁸⁶ Sr）值。大峡谷单条排水道中春季排放物的位置可能会影响化学反应，因为从基岩中排出的地下水在流过冲积物质后发生了变化。大峡谷地下水的地球化学分析表明，持续监测和更好地了解短期化学波动的重要性。