Abstract
The hydrogeochemical characteristics of springs in the granites of the Spanish Central System (SCS), a mountain range affected by cortical tectonic structures, are 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.
Résumé
Les caractéristiques hydrogéochimiques des sources des granites du Système Espagnol Central (SEC), une chaine de montage affectée par des structures tectoniques corticales, sont décrites conjointement à la recherche de l’origine des eaux de ces sources. Dans les sources à flux variable et là où elles sont associées à des altérations et fractures mineures, l’eau est de type Ca-(Na)-HCO3 avec une faible concentration en minéraux dissous totaux (TDS)(54–200 ppm) et un pH neutre ou légèrement acide. Pour les sources à flux régulier et associées à des fractures importantes, l’eau est de type Na-HCO3, avec des pH et TDS élevés (240–563 ppm). Il y a cinq sources de type Na-(Ca)-Cl et TDS élevés (780–9,205 ppm) proches du sud de la bordure tectonique du SEC. Pendant les 5,000 années du temps de résidence apparent, les eaux de type Ca-(Na)-HCO3 progressent vers un type Na-HCO3 avec une légère augmentation de la concentration en HCO3 et une perte de Ca du fait de la précipitation de calcite et des échanges ioniques, et un gain de S du fait de la réduction des sulfates. Pour des eaux de plus de 20,000 ans d’âge apparent, aucune évolution du type d’eau n’est notée. L’influence du CO2 interne est compatible avec les caractéristiques d’eau de type Na-HCO3, elle est facilitée par la fracturation. La plupart des sources délivrent une eau froide, ce qui permet de déduire une profondeur de flux au-dessus de 500 m. Seule la région de la faille de Messejana-Plasencia montre des eaux thermales de type Na-HCO3. Les eaux de type chloruré résultent de l’influence des eaux du bassin tertiaire circulant vers la bordure sud du SEC. La faille inverse à ce contact, ainsi que les structures subverticales influencées par elle, sont responsables de l’émergence de sources dans le granite. La bordure nord du SEC montre un comportement inverse.
Resumen
Se describen las características hidrogeoquímicas de manantiales en granitos del Sistema Central Español (SCS), una cadena montañosa afectada por estructuras tectónicas corticales, junto con una investigación sobre su origen. En manantiales con caudal variable y asociados con pequeñas alteraciones y fracturas, el tipo hidroquímico predominante es Ca-(Na)-HCO3, con bajo contenido de sólidos disueltos totales (TDS) (54–200 ppm) y pH neutro o ligeramente ácido. En manantiales de caudal continuo y asociados con fracturas relevantes, el tipo de agua es Na-HCO3, con mayor pH y TDS (240–563 ppm). Hay cinco manantiales con agua del tipo Na-(Ca)-Cl y alto TDS (780–9,205 ppm) cerca de los bordes tectónicos del sur del SCS. El agua subterránea del tipo Ca-(Na)-HCO3, evoluciona a agua del tipo Ca-(Na)-HCO3 antes de 5,000 años de edad aparente, aumentando ligeramente el contenido de HCO3, perdiendo Ca debido a la precipitación de calcita e intercambio iónico, y ganando S debido a la reducción de sulfatos. No se observan cambios después de 20,000 años de edad aparente. Las características del agua del tipo Na-HCO3 son compatibles con una posible influencia de CO2 de origen interno movilizado a través de fracturas. El agua de la mayoría de los manantiales es fría, por lo que se puede deducir una profundidad de flujo de hasta 500 m. Solo en la región afectada por la falla Messejana-Plasencia y sus asociadas, existen manantiales termales, del tipo Na-HCO3. Los manantiales con aguas cloruradas son el resultado de la influencia del agua subterránea de las cuencas terciarias que fluyen hacia el borde sur del SCS. La falla inversa que marca dicho borde, junto con las estructuras subverticales afectadas por ella, son responsables de la aparición de estos manantiales clorurados. El borde norte del SCS muestra un comportamiento opuesto.
摘要
描述了西班牙中央系统(SCS)花岗岩中泉水的水文地球化学特征, 该SCS的山区范围受皮层构造结构影响, 并对泉水起源进行了调查。泉水的流量是变动的, 而且泉水区与较小的蚀变和裂缝有关, 泉水类型为Ca-(Na)-HCO3, 总溶解固体(TDS)低(54–200 ppm), pH为中性或弱酸性。在具有连续流量并有裂缝的泉水中, 水类型为Na-HCO3, 具有较高的pH和TDS(240–563 ppm)。在SCS南部构造边界附近, 有五个泉水为Na-(Ca)-Cl型和高TDS(780–9,205 ppm)。在表观滞留时间为5,000年内, Ca-(Na)-HCO3型水变成Na-HCO3型, HCO3含量略有增加, 方解石沉淀和离子交换而失去Ca, 并且硫酸盐还原而获得S。在20,000年的表观年龄之后没有观察到任何变化。内部CO2的影响与Na-HCO3水类型特征一致, 并通过压裂得以体现。大多数泉水会产生冷水, 因此可以推断出最大500 m的水流深度。仅Messejana-Plasencia断层区域显示Na-HCO3型温泉。氯化物类型水是第三纪盆地水流向SCS南部边界的影响的结果。这种接触的逆断层, 以及受其影响的亚垂直结构, 是花岗岩中涌出泉水的原因。 SCS的北部边界表现出相反的行为。
Resumo
As características hidrogeoquímicas das nascentes nos granitos no Sistema Central Espanhol (SCE), uma cadeia de montanhas afetada por estruturas tectônicas corticais, são descritas, juntamente com a investigação da origem da água das nascentes. Nas nascentes com fluxo variável e onde há associação com alterações menores e fraturas, a água é do tipo Ca-(Na)-HCO3 com baixo teor de sólidos totais dissolvidos (STD) (54–200 ppm) e pH neutro a ligeiramente ácido. Nas nascentes com fluxo contínuo e associação a fraturas relevantes, o tipo de água é Na-HCO3, com pH mais elevado e STD (240–563 ppm). Há cinco nascentes com água tipo Na-(Ca)-Cl e alto STD (780–9,205 ppm), próximas à borda tectônica sul do SCE. Em 5,000 anos de tempo aparente de residência, água tipo Ca-(Na)-HCO3 progride para o tipo Na-HCO3, com leve diminuição do conteúdo de HCO3, perdendo Ca devido à precipitação de calcita e troca iônica, e ganhando S devido à redução do sulfato. Nenhuma mudança foi observada após 20,000 anos de idade aparente. A influência do CO2 interno é compatível com as características da água tipo Na-HCO3, facilitada pelo faturamento. A maioria das nascentes produz água fria, de modo que uma profundidade de fluxo de até 500 m pode ser deduzida. Apenas a região da falha Messejana-Plasencia mostra nascentes termais do tipo Na-HCO3. Água tipo Cl é um resultado da influência da água de bacias terciárias que se movem em direção à borda sul do SCE. A falha reversa nesse contato, junto com as estruturas subverticais que ela afeta, é responsável pelas fontes que aparecem no granito. A borda norte do SCE mostra o comportamento contrário.
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Acknowledgements
The authors want to thank the Spanish Nuclear Fuel and Waste Management Company (ENRESA) for providing relevant data used in this work. We want to express our gratitude to the three anonymous reviewers, whose constructive comments contributed to improvement of this work.
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Martín-Loeches, M., Pavón-García, J., Molina-Navarro, E. et al. Hydrogeochemistry of granitic mountain zones and the influence of adjacent sedimentary basins at their tectonic borders: the case of the Spanish Central System batholith. Hydrogeol J 28, 2477–2500 (2020). https://doi.org/10.1007/s10040-020-02202-1
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DOI: https://doi.org/10.1007/s10040-020-02202-1