Articles | Volume 10, issue 1
https://doi.org/10.5194/se-10-211-2019
https://doi.org/10.5194/se-10-211-2019
Research article
 | 
28 Jan 2019
Research article |  | 28 Jan 2019

Geochronological and thermometric evidence of unusually hot fluids in an Alpine fissure of Lauzière granite (Belledonne, Western Alps)

Emilie Janots, Alexis Grand'Homme, Matthias Bernet, Damien Guillaume, Edwin Gnos, Marie-Christine Boiron, Magali Rossi, Anne-Magali Seydoux-Guillaume, and Roger De Ascenção Guedes

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Cited articles

Austrheim, H. and Griffin, W.: Shear Deformation and Eclogite Formation Within Granulite-Facies Anorthosites of the Bergen Arcs, Western Norway, Chem. Geol., 50, 267–281, https://doi.org/10.1016/0009-2541(85)90124-X, 1985. 
Bellanger, M., Augier, R., Bellahsen, N., Jolivet, L., Monié, P., Baudin, T., and Beyssac, O.: Shortening of the European Dauphinois margin (Oisans Massif, Western Alps): New insights from RSCM maximum temperature estimates and 40Ar/39Ar in situ dating, J. Geodyn., 83, 37–64, https://doi.org/10.1016/j.jog.2014.09.004, 2015. 
Bergemann, C., Gnos, E., Berger, A., Whitehouse, M., Mullis, J., Wehrens, P., Pettke, T., and Janots, E.: Th-Pb ion probe dating of zoned hydrothermal monazite and its implications for repeated shear zone activity: An example from the Central Alps, Switzerland, Tectonics, 36, 2016TC004407, https://doi.org/10.1002/2016TC004407, 2017. 
Berger, A., Gnos, E., Janots, E., Whitehouse, M., Soom, M., Frei, R., and Waight, T. E.: Dating brittle tectonic movements with cleft monazite: Fluid-rock interaction and formation of REE minerals, Tectonics, 32, 1176–1189, https://doi.org/10.1002/tect.20071, 2013. 
Bernet, M.: A field-based estimate of the zircon fission-track closure temperature, Chem. Geol., 259, 181–189, 2009. 
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Short summary
This geochronological and thermometric study reveals unusually hot fluids in an Alpine-type fissure of granite from the external crystalline massif (Western Alps). The fluid is estimated to be 150-250 °C hotter than the host rock and requires a dynamic fluid pathway at mid-crustal conditions in the ductile regime. This fluid circulation resets the zircon fission track thermochronometer, but only at the fissure contact. Thermal disturbances due to advective heating appear to be localized.
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