Tartèse, Romain; Ruffet, Gilles; Poujol, Marc; Boulvais, Philippe and Ireland, Trevor R.
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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.
|Item Type:||Journal Article|
|Copyright Holders:||2011 Blackwell Publishing Ltd|
|Funders:||CNRS-INSU (‘3F’ and ‘Action incitative’ programs), Rennes Me´tropole|
|Academic Unit/Department:||Science > Physical Sciences|
|Depositing User:||Romain Tartese|
|Date Deposited:||30 Jan 2012 14:23|
|Last Modified:||23 Oct 2012 14:21|
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