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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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.
| Item Type: |
Journal Article
|
| Copyright Holders: |
2011 Blackwell Publishing Ltd |
| ISSN: |
0954-4879 |
| Funders: |
CNRS-INSU (‘3F’ and ‘Action incitative’ programs), Rennes Me´tropole |
| Academic Unit/Department: |
Science > Physical Sciences |
| Item ID: |
31686 |
| Depositing User: |
Romain Tartese
|
| Date Deposited: |
30 Jan 2012 14:23 |
| Last Modified: |
23 Oct 2012 14:21 |
| URI: |
http://oro.open.ac.uk/id/eprint/31686 |
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