%0 Journal Article %T Simultaneous resetting of the muscovite K-Ar and monazite U-Pb geochronometers: a story of fluids %+ Terre, Temps, Traçage %+ Research School of Earth Sciences [Canberra] (RSES) %A Tartese, Romain %A Ruffet, Gilles %A Poujol, Marc %A Boulvais, Philippe %A Ireland, Trevor, R. %< avec comité de lecture %Z PL02761 %@ 0954-4879 %J Terra Nova %I Wiley-Blackwell %V 23 %N 6 %P 390-398 %8 2011 %D 2011 %R 10.1111/j.1365-3121.2011.01024.x %Z Sciences of the Universe [physics]/Earth SciencesJournal articles %X Although water is ubiquitous in the continental crust, its effect on geochronometers through mineral reequilibration is rarely taken into account. Herein, we present 40Ar/39Ar analyses on muscovite and U-Pb isotopic data on zircon and monazite from a Variscan syn-tectonic granite from western France. Both the K-Ar in the muscovite and U-Pb in the monazite isotopic systems were hydrothermally reset, whereas the U-Pb radiogenic system in most of the zircons was unaffected and dates the granite emplacement age. Titanium chemical maps obtained on muscovites from various dated samples display a spectacular overprinting of their magmatic zoning resulting from increasing fluid-rock interaction. These results reiterate the need to combine geochronological data with petrological, mineralogical and geochemical studies to accurately interpret ages obtained in this type of geodynamical settings. %G English %2 https://insu.hal.science/insu-00643497/document %2 https://insu.hal.science/insu-00643497/file/Tartese-TerraNova.pdf %L insu-00643497 %U https://insu.hal.science/insu-00643497 %~ INSU %~ UNIV-RENNES1 %~ CNRS %~ GR %~ OSUR %~ UR1-HAL %~ UR1-SDLM %~ UR1-SDLMJONCH %~ GR-3T %~ TEST-UNIV-RENNES %~ TEST-UR-CSS %~ UNIV-RENNES %~ UR1-ENV %~ GR-FRODO %~ GR-CHRONOS