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Simultaneous resetting of the muscovite K-Ar and monazite U-Pb geochronometers: a story of fluids

Tartèse, Romain; Ruffet, Gilles; Poujol, Marc; Boulvais, Philippe and Ireland, Trevor R. (2011). 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.

Item Type: Journal Article
Copyright Holders: 2011 Blackwell Publishing Ltd
ISSN: 0954-4879
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetCNRS-INSU (‘3F’ and ‘Action incitative’ programs)
Not SetNot SetRennes Me´tropole
Academic Unit/Department: Science > Physical Sciences
Item ID: 31686
Depositing User: Romain Tartèse
Date Deposited: 30 Jan 2012 14:23
Last Modified: 23 Oct 2012 14:21
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