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Grenville-age pseudotachylite in the Lewisian: laserprobe 40Ar/39Ar ages from the Gairloch region of Scotland (UK)

Sherlock, Sarah C.; Jones, Kevin A. and Park, R. Graham (2008). Grenville-age pseudotachylite in the Lewisian: laserprobe 40Ar/39Ar ages from the Gairloch region of Scotland (UK). Journal of the Geological Society, 165(1) pp. 73–83.

URL: http://jgs.geoscienceworld.org/cgi/content/abstrac...
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1144/0016-76492006-134
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Abstract

Infrared laserprobe 40Ar/39Ar dating has been used to date pseudotachylite and host-rock minerals from a crush belt in the Lewisian basement of Scotland. It has revealed complexity in the pseudotachylite data that is attributable to the presence of refractory host-rock clasts and mineral fragments in the pseudotachylite. In conjunction with the host-rock mineral laserprobe 40Ar/39Ar data it has been possible to simplify the pseudotachylite data for the samples, and the preferred ages for these are: 980 ± 39 Ma, 999 ± 31 Ma and 1024 ± 30 Ma (2). These ages are the first record of Grenville-aged brittle deformation in the Lewisian. Further, this study serves to illustrate the complexity of dating pseudotachylites, and the advantages and limitations of the IR laserprobe applied to such materials.

Item Type: Journal Article
ISSN: 0016-7649
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 10608
Depositing User: Sarah Sherlock
Date Deposited: 17 Apr 2008
Last Modified: 22 Oct 2013 12:38
URI: http://oro.open.ac.uk/id/eprint/10608
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