The influence of paleoclimatic events on the functioning of an alpine thermal system (France): the contribution of hydrodynamic–thermal modeling

Gallino, Stéphanie; Josnin, Jean-Yves; Dzikowski, Marc; Cornaton, Fabien; Gasquet, Dominique

doi:10.1007/s10040-009-0510-7

Cited by 8 publications

(6 citation statements)

References 29 publications

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“…This suggests that the modern high geothermal gradients at the Brigerbad borehole represent transient conditions linked to post‐glacial heat evacuation (e.g. Gallino et al ., ), which explains the minor influence on our thermochronometric data.…”

Section: Discussionmentioning

confidence: 75%

Multi‐phase late‐Neogene exhumation history of the Aar massif, Swiss central Alps

et al. 2016

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The late-Neogene evolution of the European Alps was influenced by both tectonic and climatically driven erosion processes, which are difficult to disentangle. We use lowtemperature thermochronometry data from surface and borehole samples in the Aar massif-Rhône valley (Swiss central Alps) to constrain the exhumation history of the region. Multiple exhumation events are distinguished and linked to regional-scale tectonic deformation (before 5 Ma), short-lived climatically driven orogen contraction (between 4 and 3 Ma), and glacial valley carving since c. 1 Ma. Compared with previous studies, we clearly show the existence of two separate exhumation phases in the Late Miocene-Pliocene and better constrain the onset of glacial valley carving. The hydrothermal activity and geothermal anomalies currently observed in the borehole have been local and short-lived, with only a minor influence on thermochronometric observations. We thus suggest that late-stage glacial valley carving may have triggered topography-driven fluid flow and transient hydrothermal circulation.Apatite grains were extracted from crushed bedrock samples using standard magnetic and heavy-liquid separation techniques. 384

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Section: Discussionmentioning

confidence: 75%

Multi‐phase late‐Neogene exhumation history of the Aar massif, Swiss central Alps

et al. 2016

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“…The boundary conditions applied were those described in the previous paragraph and were considered to remain constant over time. These conditions have been used in other models and correspond to the end of the last glacial period (Maréchal ; Gallino et al ; Thiébaud et al ).…”

Section: Numerical Modeling Of Hydrothermal Systemsmentioning

confidence: 99%

“…Heating under the valley floor around the LFZ extends farther above the LFZ than below the LFZ. Heating in the LFZ is due to the effect of flushing toward the outlets (Lazear ; Gallino et al ; Thiébaud et al ). Mixing between upwelling hot water and a small flow of cold water through the valley sides appears near the top of the valley floor.…”

Section: Thermal Effects Associated With Groundwater Circulationsmentioning

confidence: 99%

“…However, the groundwater can be cooled down during streaming by dissipating heat into the surrounding rocks (Alföldi et al ). Several 2D numerical models of hydrothermal systems in mountain areas have shown that forced convection cools the aquifer under the recharge zone and pushes the heated water toward the discharge zone (Lazear ; Gallino et al ). These models also highlight the fact that groundwater circulation disturbs the thermal gradient in the surrounding rock.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Influence of an Alpine Deep Hydrothermal Fault on the Surrounding Rocks

Dzikowski¹,

Josnin

Roche

2015

Groundwater

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Major fault zones in mountain areas are often associated with cold-water circulations and hydrothermal pathways. Compared with the massif as a whole, the deep groundwater flows in these high hydraulic-conductivity zones modify the thermal state of the surrounding rock. This paper examines the thermal effects of groundwater flow in the area around the steeply dipping La Léchère deep fault zone (LFZ, French Alps) and associated shallow decompressed zone. We used a 3D numerical model drawn up from groundwater circulation data to investigate the La Léchère hydrothermal system and the thermal state of the rock in the valley sides. Hydrothermal simulations showed that convective flow into the LFZ cools the valley sides and creates a thermal upwelling under the valley floor. An unsteady thermal regime that continues for about 10,000 years is also needed to obtain the temperatures currently found under the valley floor in the LFZ. Temperature-depth profiles around the LFZ show disturbances in the thermal gradients in the valley sides and the valley floor. Convective heat transfer into the LFZ and the decompressed zone, and conductive heat transfer in the surrounding rocks produce an unsteady, asymmetric thermal state in the rock on both sides of the LFZ.

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“…This corresponds to water flow pathways (see Fig. S2 for Darcy fluxes: they are several order of magnitude greater in the fractures than in the rock matrix) which drives the cold water from high-elevated areas to lower and warmer areas throughout these main flow paths (Ingebritsen and Sanford, 1998;Gallino et al, 2009;Thiébaud et al 2010;Dzikowski et al, 2016). Cold corridors thus develop along the major fractures and gradually affects the In the same way, thawing is also highly constrained by the saturation level but also by the temperature and fracture connectivity.…”

Section: Temperature Fieldsmentioning

confidence: 99%

Water Flows in Rockwall Permafrost: a Numerical Approach Coupling Hydrological and Thermal Processes

Magnin

Josnin

2021

Preprint

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The influence of paleoclimatic events on the functioning of an alpine thermal system (France): the contribution of hydrodynamic–thermal modeling

Cited by 8 publications

References 29 publications

Multi‐phase late‐Neogene exhumation history of the Aar massif, Swiss central Alps

Multi‐phase late‐Neogene exhumation history of the Aar massif, Swiss central Alps

Thermal Influence of an Alpine Deep Hydrothermal Fault on the Surrounding Rocks

Water Flows in Rockwall Permafrost: a Numerical Approach Coupling Hydrological and Thermal Processes

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