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Dating fault reactivation by Ar/Ar laserprobe: an alternative view of apparently cogenetic mylonite–pseudotachylite assemblages

Sherlock, S.C.; Watts, L.M.; Holdsworth, R.E. and Roberts, D. (2004). Dating fault reactivation by Ar/Ar laserprobe: an alternative view of apparently cogenetic mylonite–pseudotachylite assemblages. Journal of the Geological Society, 161(3) pp. 335–338.

URL: http://www.ingentaconnect.com/content/geol/jgs/200...
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1144/0016-764903-160
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Abstract

Apparently cogenetic mylonite–pseudotachylite assemblages are commonly reported in major fault zones. They represent two very incompatible modes of deformation, and complex formation mechanisms have been proposed to explain this paradox. We report here one such assemblage from Central Norway in which apparently synchronous mylonite and pseudotachylite formation is separated by 100 Ma-mean muscovite Ar/Ar laserprobe spot ages from mylonite, and pseudotachylite matrix, are 406 ± 11 Ma and 290 ± 10 Ma respectively. In preference to a complex cogenetic model we invoke fault reactivation as a viable alternative, and suggest that assumed contemporaneity in such assemblages may be invalid in many cases.

Item Type: Journal Article
ISSN: 0016-7649
Extra Information: Some of the symbols may not have transferred correctly into this bibliographic record and/or abstract.
Keywords: Ar-Ar; argon geochronology; pseudotachylite; mylonite; reactivation; Møre–Trøndelag Fault Complex
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 2239
Depositing User: Sarah Sherlock
Date Deposited: 12 Jun 2006
Last Modified: 02 Dec 2010 19:47
URI: http://oro.open.ac.uk/id/eprint/2239
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