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Journal of the Geological Society; 2006; v. 163; issue.5; p. 801-814;
DOI: 10.1144/0016-76492005-076
© 2006 Geological Society of London

Original Article

Thrust sequences and the significance of low-angle, out-of-sequence faults in the northernmost Moine Nappe and Moine Thrust Zone, NW Scotland

R.E. Holdsworth1, R.A. Strachan2, G.I. Alsop3, C.J. Grant4 & R.W. Wilson1

1 1Research Reactivation Group, Department of Geological Sciences, University of Durham, South Road, Durham DH1 3LE, UK (e-mail: r.e.holdsworth@durham.ac.uk)
2 2School of Earth & Environmental Sciences, University of Portsmouth, Burnaby Road, Portsmouth PO1 3QL, UK
3 3School of Geography & Geosciences, University of St. Andrews, Irvine Building, St. Andrews KY16 9AL, UK
4 4Shell Inc., Woodcreek, Dairy Ashford, Houston, TX 77079, USA

In common with most thrust belts, the Moine Thrust Zone, Scotland, preserves a foreland-propagating sequence of thrusting. However, significant examples of local to regional overstep sequences are also recognized and their interpretation remains controversial. Remapping of the northernmost Moine Thrust Zone has defined a thick belt of mylonites in the centre of which lies the ductile WNW-directed Moine Thrust. The base of the mylonite belt, however, is marked by a regionally significant, low-angle, west-directed brittle fault, here termed the Lochan Riabhach Thrust, that truncates thrust-related structures in its footwall. Comparison of the tectonic stratigraphy of the mylonite belt with that preserved in a downfaulted outlier to the west at Durness indicates that the Lochan Riabhach Thrust cuts down-section in its footwall and therefore appears to be extensional. Locally, it is unequivocally breached by underlying imbricate thrusts. We prefer to interpret the Lochan Riabhach ‘Thrust’ as an extensional fault that formed during a hiatus in thrust stacking. We relate this faulting episode to the changes in the stability of the evolving orogenic wedge and reiterate that such extensional faults may be common, although possibly unrecognized, features in many other thrust belts.




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R. E. Holdsworth, G. I. Alsop, and R. A. Strachan
Tectonic stratigraphy and structural continuity of the northernmost Moine Thrust Zone and Moine Nappe, Scottish Caledonides
Geological Society, London, Special Publications, 2007; 272: 121 - 142.
[Abstract] [PDF]