This work presents hydrochemical results for groundwater and dissolved gas samples collected from a thermal and cold aquifer in the Juchipila Basin, in southern Sierra Madre Occidental, central Mexico. Thermal springs in the Juchipila Basin reach temperatures of 60 °C, these manifestations are not related to recent or active volcanism as are all the known geothermal fields in Mexico. The thermal waters (>32 °C) are Na-HCO₃ and Na-SO₄ type, with an anomalous concentration of F, B, Li, and As. Their chemistry likely results from water-rock interaction processes. The cold waters (<32 °C) have a Ca-HCO₃ composition typical of recent infiltration and shallow flow, but they have an anomalous concentration of NO₃. The δ²H and δ¹⁸O indicate a common meteoric source for the warm and cold water plotting along an evaporation line. The waters have higher CO₂ and He concentrations than the air-saturated water. The helium composition is mainly atmospheric and terrigenous with a mantle helium contribution of up to 14%. This suggests that faults affecting the region are deeply rooted, permitting mantle helium uprise. Geothermometry gives mean reservoir temperatures of 58–102 °C. Based on these results, we propose a model of hydrothermal circulation in the Juchipila Basin, in which rainwater infiltrates deeply through the graben edges fault system, dissolves ions and crustal helium, incorporates mantle helium, while heated by the geothermal gradient, and eventually surges and mixes with the cold, shallow aquifer along faults cutting the whole succession within the graben.

这项工作介绍了从墨西哥中部西拉马德雷山脉南部Juchipila盆地的热和冷含水层收集的地下水和溶解气体样品的水化学结果。Juchipila盆地的温泉达到60°C的温度，这些表现与近期或活跃的火山活动无关，就像墨西哥所有已知的地热田一样。热水（> 32°C）是Na-HCO ₃和Na-SO ₄型，其反常浓度为F，B，Li和As。它们的化学性质可能是水-岩相互作用的结果。冷水（<32°C）具有近期渗透和浅水流典型的Ca-HCO ₃组成，但它们的NO ₃浓度反常。该δ ²H和δ ¹⁸ ö指示用于温水和冷水沿着蒸发线绘制的公共源大气。这些水的CO ₂含量更高他的浓度比空气饱和的水还要浓。氦气成分主要为大气和陆源，地幔中的氦气含量高达14％。这表明影响该地区的断层根深蒂固，使地幔氦上升。地热法得出的平均储层温度为58–102°C。根据这些结果，我们提出了一个朱基匹拉盆地的热液循环模型，其中雨水通过grab缘断层系统深层渗入，溶解离子和地壳氦，并结合了地幔氦，同时被地热梯度加热，最终激增并沿着断层与冷的浅层含水层混合，从而切断grab沟内的整个演替过程。