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Observation of centimetre-scale argon diffusion in alkali feldspars: implications for 40Ar/39Ar thermochronology

Flude, Stephanie; Halton, Alison M.; Kelley, Simon P.; Sherlock, Sarah C.; Schwanethal, James and Wilkinson, Camilla M. (2014). Observation of centimetre-scale argon diffusion in alkali feldspars: implications for 40Ar/39Ar thermochronology. Geological Society, London, Special Publications, 378 pp. 265–275.

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New data from a gem-quality feldspar from Itrongay, Madagascar, record naturally occurring 40Ar/39Ar age profiles which can be numerically modelled by invoking a single diffusion mechanism and show that microtexturally simple crystals are capable of recording complex thermal histories. We present the longest directly measured, naturally produced 40Ar*-closure profiles from a single, homogeneous orthoclase feldspar. These data appear to confirm the assumption that laboratory derived diffusion parameters are valid in nature and over geological timescales. Diffusion domains are defined by crystal faces and ancient cracks, thus in gem-quality feldspars the diffusion domain size equates to the physical grain size. The data also illustrate the potential of large, gem-quality feldspars to record detailed thermal histories over tens of millions of years and such samples should be considered for future studies on the slow cooling of continental crust.

Item Type: Journal Item
Copyright Holders: 2014 The Authors
ISSN: 2041-4927
Project Funding Details:
Funded Project NameProject IDFunding Body
A new approach to Ar/Ar thermochronology: investigating the effects of recrystallisation and deformation on alkali feldspar crystalsNE/E018629/1NERC (Natural Environment Research Council)
Not SetNE/1016023NERC (Natural Environment Research Council)
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Learning and Teaching Innovation (LTI) > Institute of Educational Technology (IET)
Learning and Teaching Innovation (LTI)
Item ID: 39786
Depositing User: Alison Halton
Date Deposited: 26 Mar 2014 09:43
Last Modified: 08 Dec 2018 13:20
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