Journal articles
Simultaneous resetting of the muscovite K-Ar and monazite U-Pb geochronometers: a story of fluids
Abstract : 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.
Cited literature [34 references]
https://hal-insu.archives-ouvertes.fr/insu-00643497
Contributor : Isabelle Dubigeon <>
Submitted on : Tuesday, December 6, 2011 - 11:28:06 AM
Last modification on : Thursday, January 14, 2021 - 11:51:12 AM
Long-term archiving on: : Monday, December 5, 2016 - 11:31:33 AM
Contributor : Isabelle Dubigeon <>
Submitted on : Tuesday, December 6, 2011 - 11:28:06 AM
Last modification on : Thursday, January 14, 2021 - 11:51:12 AM
Long-term archiving on: : Monday, December 5, 2016 - 11:31:33 AM
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