Tartèse, Romain; Ruffet, Gilles; Poujol, Marc; Boulvais, Philippe and Ireland, Trevor R.
Simultaneous resetting of the muscovite K-Ar and monazite U-Pb geochronometers: a story of fluids.
Terra Nova, 23(6) pp. 390–398.
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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.
||2011 Blackwell Publishing Ltd
|External Project Funding Details:
|Funded Project Name||Project ID||Funding Body|
|Not Set||Not Set||CNRS-INSU (‘3F’ and ‘Action incitative’ programs)|
|Not Set||Not Set||Rennes Me´tropole|
||Science > Physical Sciences
||30 Jan 2012 14:23
||23 Oct 2012 14:21
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