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High spatial resolution 40Ar/39Ar dating of pseudotachylites: geochronological evidence for multiple phases of faulting within basement gneisses of the Outer Hebrides (UK)

Sarah C. Sherlock, Rob A. Strachan and Kevin A. Jones
Journal of the Geological Society, 166, 1049-1059, 28 October 2009, https://doi.org/10.1144/0016-76492008-125
Sarah C. Sherlock
1 Department of Earth and Environmental Sciences, Centre for Earth, Planetary, Space & Astronomical Research (CEPSAR), The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
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Rob A. Strachan
2 School of Earth and Environmental Sciences, University of Portsmouth, Portsmouth PO1 3QL, UK
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Kevin A. Jones
3 Hills Road Sixth Form College, Hills Road, Cambridge CB2 8PE, UK
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Abstract:

Pseudotachylites within the Neoarchaean to Palaeoproterozoic basement of the Lewisian Gneiss Complex have been analysed using the high spatial resolution 40Ar/39Ar UV laserprobe technique. It has been possible to measure 40Ar/39Ar age and ‘apparent' age variations that would be beyond resolution by lower spatial resolution or bulk 40Ar/39Ar dating methods. We report a range of complexities including significantly younger narrow (<1 mm) margins on much older pseudotachylite veins, and heterogeneous excess argon contamination. We also report pseudotachylite veins of varying magnitudes that have been subject to later thermal reheating, whereby there is a relationship between vein thickness and extent of argon loss. In spite of these it is still possible to determine geologically meaningful 40Ar/39Ar ages for pseudotachylite-forming events. In Lewis the c. 1900 Ma event may relate to early stages of Laxfordian reworking. In Barra and South Uist a 1300–1200 Ma event is recorded, whereas in Barra, South and North Uist a second event is recorded at c. 700 Ma, which is likely to be associated with NW- and west-directed thrusting, and could represent far-field effects of tectonic events recorded at this time east of the Moine Thrust in NW Scotland.

Supplementary material: 40Ar/39Ar data are available at http://www.geolsoc.org.uk/SUP18372.

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Journal of the Geological Society: 166 (6)
Journal of the Geological Society
Volume 166, Issue 6
December 2009
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High spatial resolution 40Ar/39Ar dating of pseudotachylites: geochronological evidence for multiple phases of faulting within basement gneisses of the Outer Hebrides (UK)

Sarah C. Sherlock, Rob A. Strachan and Kevin A. Jones
Journal of the Geological Society, 166, 1049-1059, 28 October 2009, https://doi.org/10.1144/0016-76492008-125
Sarah C. Sherlock
1 Department of Earth and Environmental Sciences, Centre for Earth, Planetary, Space & Astronomical Research (CEPSAR), The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
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Rob A. Strachan
2 School of Earth and Environmental Sciences, University of Portsmouth, Portsmouth PO1 3QL, UK
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Kevin A. Jones
3 Hills Road Sixth Form College, Hills Road, Cambridge CB2 8PE, UK
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High spatial resolution 40Ar/39Ar dating of pseudotachylites: geochronological evidence for multiple phases of faulting within basement gneisses of the Outer Hebrides (UK)

Sarah C. Sherlock, Rob A. Strachan and Kevin A. Jones
Journal of the Geological Society, 166, 1049-1059, 28 October 2009, https://doi.org/10.1144/0016-76492008-125
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    • 40Ar/39Ar dating of pseudotachylite: assumptions and techniques
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