Articles | Volume 11, issue 5
https://doi.org/10.5194/se-11-1747-2020
https://doi.org/10.5194/se-11-1747-2020
Research article
 | 
14 Sep 2020
Research article |  | 14 Sep 2020

Tracking geothermal anomalies along a crustal fault using (U − Th)∕He apatite thermochronology and rare-earth element (REE) analyses: the example of the Têt fault (Pyrenees, France)

Gaétan Milesi, Patrick Monié, Philippe Münch, Roger Soliva, Audrey Taillefer, Olivier Bruguier, Mathieu Bellanger, Michaël Bonno, and Céline Martin

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Cited articles

Agosta, F., Prasad, M., and Aydin, A.: Physical properties of carbonate fault rocks, fucino basin (Central Italy): implications for fault seal in platform carbonates, Geofluids, 7, 19–32, https://doi.org/10.1111/j.1468-8123.2006.00158.x, 2007. 
Andrews, J. N. and Lee, D. J.: Inert gases in groundwater from the Bunter Sandstone of England as indicators of age and palaeoclimatic trends, J. Hydrol., 41, 233–252, https://doi.org/10.1016/0022-1694(79)90064-7, 1979. 
Ault, A. K., Gautheron, C., and King, G. E.: Innovations in (U-Th)/He, Fission Track, and Trapped Charge Thermochronometry with Applications to Earthquakes, Weathering, Surface Connections, and the Growth and Decay of Mountains, Tectonics, 38, 3705–3739, https://doi.org/10.1029/2018TC005312, 2019. 
Ballas, G., Soliva, R., Sizun, J.-P., Benedicto, A., Cavailhes, T., and Raynaud, S.: The importance of the degree of cataclasis in shear bands for fluid flow in porous sandstone, Provence, France, AAPG Bull., 96, 2167–2186, https://doi.org/10.1306/04051211097, 2012. 
Ballouard, C., Poujol, M., Boulvais, P., Mercadier, J., Tartèse, R., Venneman, T., Deloule, E., Jolivet, M., Kéré, I., Cathelineau, M., and Cuney, M.: Magmatic and hydrothermal behavior of uranium in syntectonic leucogranites: The uranium mineralization associated with the Hercynian Guérande granite (Armorican Massif, France), Ore Geology Reviews, 80, 309–331, https://doi.org/10.1016/j.oregeorev.2016.06.034, 2017. 
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Short summary
This study proposes a new way to highlight hydrothermal fluid circulations and thermal anomalies in the Earth's crust with a combined evaluation of the age of granite and gneiss apatites (< 200 µm) as well as the behaviour of their chemical elements. As an exploration tool, this approach is very promising and complementary to other geothermal exploration techniques based on numerical modelling. Moreover, it is a cost-effective tool as it allows for constraining geothermal models.