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Journal of the Geological Society; 2008; v. 165; issue.1; p. 73-83;
DOI: 10.1144/0016-76492006-134
© 2008 Geological Society of London

Original Article

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

Sarah C. Sherlock1, Kevin A. Jones2 & R.Graham Park3

1 Department of Earth and Environmental Sciences, Centre for Earth, Planetary, Space & Astronomical Sciences (CEPSAR), The Open University, Walton Hall, Milton Keynes MK7 6AA, UK (e-mail: s.sherlock{at}open.ac.uk)
2 Hills Road Sixth Form College, Hills Road, Cambridge CA9 99A, UK
3 12 Provost Ferguson Drive, Tain IV19 1RE, UK

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{sigma}). 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.





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S. C. Sherlock, R. A. Strachan, and K. A. Jones
High spatial resolution 40Ar/39Ar dating of pseudotachylites: geochronological evidence for multiple phases of faulting within basement gneisses of the Outer Hebrides (UK)
Journal of the Geological Society, 2009; 166: 1049 - 1059.
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