Articles | Volume 10, issue 1
Solid Earth, 10, 211–223, 2019
https://doi.org/10.5194/se-10-211-2019
Solid Earth, 10, 211–223, 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 et al.

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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.