Properties of geothermal fluids in Switzerland: A new interactive database

Sonney, Romain; Vuataz, François-David

doi:10.1016/j.geothermics.2008.07.001

Cited by 36 publications

(34 citation statements)

References 4 publications

(4 reference statements)

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“…The total heat flux in the Baden and Schinznach spring system that is used as a case study is 2.4 × 10 6 W, which was 5 calculated using spring discharge and temperature data reported by Sonney and Vuataz (2008) and an assumed recharge temperature of 10°C. With a background heatflow of 0.07 Wm 2 the minimum contributing area for the heat output of the springs is 3.5×10 7 m 2 .…”

Section: Applicationmentioning

confidence: 99%

Beo v1.0: Numerical model of heat flow and low-temperature thermochronology in hydrothermal systems

Luijendijk¹

2019

Preprint

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Low-temperature thermochronology can provide records of the thermal history of the upper crust and can be a valuable tool to quantify the history of hydrothermal systems. However, existing model codes of heat flow around hydrothermal systems do not include low-temperature thermochronology. Here I present a new model code that simulates thermal history 5 around hydrothermal systems on geological timescales. The modelled thermal histories are used to calculate apatite (U-Th)/He (AHe) ages, which is a thermochronometer that is sensitive to temperatures up to 70°C. The modelled AHe ages can be compared to measured values in surface outcrops or borehole samples to quantify the history of hydrothermal activity. Heat flux at the land surface is based on equations of latent and sensible heat flux, which allows more realistic land surface and spring temperatures than models that use simplified boundary conditions. Instead of simulating fully coupled fluid and heat 10 flow, the code only simulates advective and conductive heat flow, with the rate of advective fluid flux specified by the user. This relatively simple setup is computationally efficient and allows running larger numbers of models to quantify model sensitivity and uncertainty. Example case studies demonstrate the sensitivity of hot spring temperatures to the depth, width and angle of permeable fault zones, and the effect of hydrothermal activity on AHe ages in surface outcrops and at depth.

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Section: Applicationmentioning

confidence: 99%

Beo v1.0: Numerical model of heat flow and low-temperature thermochronology in hydrothermal systems

Luijendijk¹

2019

Preprint

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“…All selected waters have a chloride content higher than 100 mg/L. The Rheinfelden brine is a subthermal spring in the north of the Molasse Basin in Switzerland, which dissolves halite rocks in Keuper (Sonney and Vuataz, 2008). Fig.…”

Section: Regional Deep Flow Systemmentioning

confidence: 99%

“…Toutes les eaux sé lectionné es ont des teneurs en Cl supé rieures à 100 mg/L. La saumure de Rheinfelden est une source subthermale localisé e au nord du bassin molassique suisse, qui dissout la halite du Keuper (Sonney and Vuataz, 2008). …”

Section: Regional Deep Flow Systemunclassified

Remobilisation of deep Na-Cl waters by a regional flow system in the Alps: Case study of Saint-Gervais-les-Bains (France)

Sonney

Vuataz

2010

Comptes Rendus. Géoscience

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A B S T R A C TThe hydrothermal system of Saint-Gervais-les-Bains, France is located in a south western low-elevation point of the Aiguilles Rouges crystalline Massif. The crystalline rocks are not directly outcropping in the studied area but certainly exist beyond 300 m depth. Uprising waters are pumped from two different aquifers below the Quaternary deposits of the Bon Nant Valley. In the Lower Trias-Permian aquifer crossed by De Mey boreholes (27-36 8C), the ascending Na-SO 4 and high-Cl thermal water from the basement (4.8 g/L) is mostly mixed by Ca-SO 4 and low-Cl cold water circulating in the autochthonous cover of the Aiguilles Rouges Basement. The origin of the saline thermal water probably results from infiltration and circulation in the basement until it reaches deep thrust faults with leaching of residual brines or fluid inclusions at depth (Cl/Br molar ratio lower than 655). The dissolution of Triassic halite (Cl/Br > 1000) is not possible at SaintGervais-les-Bains because the Triassic cold waters have a low-Cl concentration (< 20 mg/L). Water-rock interactions occur during the upflow via north-south strike-slip faults in the basement and later on in the autochthonous cover. For the De Mey Est borehole, gypsum dissolution is occurring with cationic exchanges involving Na, as well as low-temperature Mg dissolution from dolomite in the Triassic formations. The aquifer of imbricated structures (Upper-Middle Trias) crossed by the Lé pinay well (39 8C) contains thermal waters, which are strongly mixed with a low-Cl water, where gypsum dissolution also occurs. The infiltration area for the thermal end-member is in the range 1700-2100 m, close to the Lavey-les-Bains hydrothermal system corresponding to the Aiguilles Rouges Massif. For the Ca-SO 4 and lowCl end-member, the infiltration area is lower (1100-1300 m) showing circulation from the Mont Joly Massif. The geothermometry method indicates a reservoir temperature of probably up to 65 8C but not exceeding 100 8C. R É S U M ÉLe systè me hydrothermal de Saint-Gervais-les-Bains, France est localisé au niveau du point bas du massif cristallin des Aiguilles Rouges, côté sud-ouest. Le socle n'affleure pas directement sur la zone é tudié e, mais est certainement pré sent au-delà de 300 m de profondeur. Les eaux thermales ascendantes sont pompé es dans deux diffé rents aquifè res, sous les dé pôts quaternaires de la vallé e du Bon Nant. Dans l'aquifè re du Permien-Trias infé rieur traversé par les forages De Mey (27-36 8C), une eau thermale ascendante Na-SO 4 riche en Cl issue du socle cristallin (4,8 g/L) est essentiellement dilué e par une eau froide * Corresponding author.E-mail addresses: romain.sonney@crege.ch, romain.sonney@unine.ch (R. Sonney).Ca-SO 4 , pauvre en chlorure, circulant dans la couverture autochtone du socle des Aiguilles Rouges. Cette eau thermale saline se serait infiltré e dans les Aiguilles Rouges et circulerait en profondeur jusqu'aux plans de chevauchement, avec le lessivage de saumures ré siduelles d'inclusions fluides (rapport molair...

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“…Apart from the effect of latitude, ground surface temperature can be locally disturbed by surface heterogeneities such as topography (Blackwell, Steele, and Brott, 1980) or the presence of lakes. These permanent disturbances should be theoretically considered when subsurface temperatures are studied, especially if representative length scale of surface features compare with the studied depths (e.g., warm water outflows in tunnels of Switzerland, Sonney and Vuataz, 2008). Transient changes in surface conditions such as those induced by forest fires may also affect subsurface temperatures but only for a short period.…”

Section: Far-field Conditionsmentioning

confidence: 99%