The hydrogeochemical characteristics of springs in the granites of the Spanish Central System (SCS), a mountain range affected by cortical tectonic structures, is described, along with an investigation of the spring water origin. In springs with variable flow and where they are associated with minor alterations and fractures, water type is Ca-(Na)-HCO₃ with low total dissolved solids (TDS; 54–200 ppm) and a neutral or slightly acid pH. In springs that have continuous flow and association with relevant fractures, water type is Na-HCO₃, with higher pH and TDS (240–563 ppm). There are five springs with water type Na-(Ca)-Cl and high TDS (780–9,205 ppm) near the SCS’s southern tectonic borders. Within 5,000 years of apparent residence time, Ca-(Na)-HCO₃ water progresses to Na-HCO₃ type, slightly increasing HCO₃ content, losing Ca due to calcite precipitation and ionic exchange, and gaining S due to sulphate reduction. No changes are observed after 20,000 years of apparent age. The influence of internal CO₂ is compatible with Na-HCO₃ water type characteristics, facilitated by fracturing. Most of the springs yield cold water; thus, a flow depth up to 500 m can be deduced. Only the Messejana-Plasencia fault region shows Na-HCO₃-type thermal springs. Chloride type water is a result of the influence of the Tertiary basins’ water moving towards the southern border of the SCS. The reverse fault in such contact, together with the subvertical structures affected by it, are responsible for the springs emerging in the granite. The northern border of the SCS shows the opposite behaviour.

描述了西班牙中央系统（SCS）花岗岩中春季的水文地球化学特征，该山脉受皮质构造结构影响，并对泉水起源进行了调查。在流量可变的春季中，它们与较小的蚀变和裂缝有关，水的类型为Ca-（Na）-HCO ₃，其总固形物较低（TDS； 54–200 ppm），pH为中性或弱酸性。在具有连续流动并伴有相关裂缝的弹簧中，水类型为Na-HCO ₃，具有较高的pH和TDS（240-563 ppm）。在南海南部构造边界附近，有五个泉水的Na-（Ca）-Cl型和高TDS（780-9,205 ppm）。在表观停留时间的5,000年内，Ca-（Na）-HCO ₃水逐渐变成Na-HCO ₃型，HCO ₃含量略有增加，由于方解石沉淀和离子交换而失去Ca，由于硫酸盐还原而获得S。在20,000年的表观年龄之后没有观察到任何变化。内部CO ₂的影响与Na-HCO ₃水类型特征兼容，并通过压裂促进。大部分的温泉都产生冷水。因此，可以推断出最大500 m的水深。仅Messejana-Plasencia断裂带显示Na-HCO ₃型热弹簧。氯化物类水是第三纪盆地水流向南海南部边界的影响的结果。这种接触的反向断层，以及受其影响的亚垂直结构，是造成花岗岩中涌出的弹簧的原因。SCS的北部边界表现出相反的行为。