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Tena, J. M.; Auqué, Luis F.; Gimeno, M. Concepción; Femández, J.; Collado, Juan Miguel A. Mandado

doi:10.3989/egeol.90461-2435

Cited by 3 publications

(2 citation statements)

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“…However, despite these works, the origin of the springs and the conceptual hydrogeological model of the Alhama-Jaraba thermal system are still not clearly established. Initially it was thought that the main flow of thermal water came from the south (Sierra del Solorio), where there is a plateau with extensive outcrops of mainly Jurassic carbonate 120 materials (Hernández Pacheco, 1954, ITGE-DGA (1994), Tena et al (1995) and Sánchez et al, 2000. In other words, according to these authors, the water would be recharged in the Castilian branch of the Iberian Range and would come out through the aforementioned springs of different altitudes distributed along the Cretaceous alignment on the other edge of the Almazán basin (Fig.…”

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confidence: 99%

“…2). Some of these authors leave open the possibility that part of the Alhama water may also come from the northwest of the Deza (Hernández Pacheco 125 (1954;Tena et al (1995). It is SGOP (1990) and Sanz and Yélamos (1994) who propose that the main recharge area of Alhama is distributed throughout the Cretaceous calcareous remnants and poljes of the entire northwestern Deza and explain this in a simplified 2D model.…”

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Improvement of the thermal spring protection area through numerical modelling and interdisciplinary studies

Sanz de Ojeda,

Elorza Tenreiro,

Sanz Pérez

2024

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Abstract. The integration of different sources of geological and hydrogeological information and the application of interdisciplinary methods have informed the origin of the thermal springs of Alhama de Aragón and Jaraba, as well as others associated semi thermal springs (1,200 l/s of combined flow, 711 l/s at over 30 °C). This issue is key to being able to design any sustainable conservation strategy in terms of quantity and quality of resources within the recharge area of the most important thermal springs in Spain. The Upper Cretaceous limestones and dolomites constitute the main aquifer of the Alhama and Jaraba thermal system. It extends continuously under the slightly permeable Tertiary of the Almazán Basin in the form of a NW-SE "synclinorium". Its bottom has extensive depths of more than 3,000 and 4,000 m in the NE sector, which constitute the focus of heat considering normal geothermal gradients. From the results of the modelling of the flow of this thermal system, it can be concluded that the origin of these springs comes mainly from the autogenous recharge that occurs in the Cretaceous calcareous outcrops that border the Almazán Basin to the north, both in the Ebro Basin (Jalón Valley) and in the more distant Duero Basin. The underground flow follows a NW-SE direction flowing across the Duero-Ebro divide, favored by the topographic difference in elevation between the two basins. The modelled regional flow is coherent with the progressive increase in temperature, water age, mineralization, and flow of the springs through which the system discharges.

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confidence: 99%

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confidence: 99%

Improvement of the thermal spring protection area through numerical modelling and interdisciplinary studies

Sanz de Ojeda,

Elorza Tenreiro,

Sanz Pérez

2024

Preprint

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Current travertines precipitation related to artificial CO2 leakages from a natural reservoir (Gañuelas-Mazarrón Tertiary Basin, SE Spain)

Rodrigo-Naharro

Herrero

Huertas

et al. 2019

Journal of Hydrology

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In the framework of a natural CO 2 reservoir with CO 2 leakages as an analogue of a failed CO 2 deep geological storage, the current precipitation of travertines and the associated upwelling of CO 2-rich saline groundwater were analysed. This natural analogue is located in the Gañuelas-Mazarrón Tertiary Basin (SE Spain). The study comprises of the chemistry of both groundwater and travertines, including stable isotopes, mineralogy and petrography of the travertines, all this performed after a review of the geology of the basin. In this sense, the basin gathers the main features of a safe natural CO 2 reservoir in a deep saline aquifer sealed by a thick marl formation. The aquifer was artificially perturbed by the drilling of wells, inducing the travertines precipitation at these water discharge points. Groundwater is saline, slightly acid, oversaturated in aragonite and calcite and with significant concentrations of heavy elements, some of them toxic. From an isotopic viewpoint, the relative constant δ 13 C-DIC values suggest that carbon is mainly inorganic in origin with minor organic and mantle contributions. Travertines are basically composed of aragonite or calcite, their precipitation being controlled by a sudden CO 2 degassing and minor biological activity. Their δ 13 C signatures indicate that carbon mainly has an inorganic origin, although some contribution of organic carbon must be considered as well. Furthermore, these carbonate deposits did not precipitate in isotopic equilibrium, as determined by δ 18 O values. Finally, it is suggested that the appearance of travertines along with their carbon isotopic signatures represent efficient tools for detecting CO 2 leakages from any CO 2 storage site.

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Auqué¹,

Collado²,

Gimeno³

et al. 1996

Estud. geol.

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RESUMENLas aguas de los sistemas geotermales de Panticosa, Benasque, Arties, Caldas de Bohí, Luchon y Cauterets en el Pirineo Central presentan rasgos geoquímicos similares (valores de pH elevados, bajo contenido de sólidos disueltos, muy bajas concentraciones de Mg, sodio como catión dominante y sin un anión en proporciones preponderantes sobre los demás), comunes a los existentes en otros sistemas pirenaicos y característicos de la tipología de aguas termales alcalinas asociadas a materiales graníticos. Sin embargo y más específicamente, las concentraciones de Na y K en las aguas de Panticosa y Benasque son las más bajas de todas las definidas hasta el momento en este grupo de aguas termales alcalinas.Los valores de pH de los manantiales termales se encuentran relacionados con la temperatura de surgencia y, como ocurre en el resto de sistemas geotermales pirenaicos, dependen de la intensidad del proceso de enfriamiento durante el ascenso de la solución. Los cálculos de especiación en condiciones de surgencia indican que: los valores de presión parcial de CO 2 de las soluciones son muy bajos; la sílice disuelta se encuentra parcialmente ionizada; y la especie Al(OH)4-es la forma dominante de aluminio en solución.Los índices de saturación obtenidos demuestran que casi todas las aguas consideradas se encuentran sobresaturadas respecto a cuarzo (próximas al equilibrio con calcedonia), feldespato potásico y albita, minerales con los que factiblemente las soluciones establecen relaciones de equilibrio en el reservorio. Pero, además, todas las aguas se encuentran en situaciones de equilibrio respecto a calcita y caolinita en condiciones de surgencia, lo que demuestra la existencia de procesos de reequilibrio durante su ascenso hasta los manantiales y evidencia uno de los caracteres más importantes en la evolución geoquí-mica de este tipo de sistemas alcalinos. Palabras clave: Sistemas geotermales, granitos. aguas termales alcalinas. caracteres geoquimicosocálculos de especiacion-solubilidad. ABSTRACTThe compositional characters of selected hot springs from the Panticosa, Benasque, Arties, Caldas de Bohí, Luchon and Cauterets geothermal systems in the Central Pyrenees have been studied. All the springs have the same global geochemical features (high pH, low total dissolved solids, very low Mg concentrations, Na as the dominant cation, and absence of a dominant anion) and belong to the same granite-related alkaline thermal waters group. Chemical composition of the springs is similar to each other, and to that found in other Pyrenean geothermal systems. A more detailed comparison shows, however, that Panticosa and Benasque systems have the lowest sodium and potassium concentrations found in any water belonging to the group of alkaline waters.Differences in pH values among the springs are related to emergence temperature as it occurs in the Pyrenean geothermal systems. According to the high pH of these waters, speciation calculations at emergence temperature show a very low CO 2 partial pressure, dissolved silica partial...

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Cited by 3 publications

References 27 publications

Improvement of the thermal spring protection area through numerical modelling and interdisciplinary studies

Improvement of the thermal spring protection area through numerical modelling and interdisciplinary studies

Current travertines precipitation related to artificial CO2 leakages from a natural reservoir (Gañuelas-Mazarrón Tertiary Basin, SE Spain)

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