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Book Chapter

Kinematic retro-modelling of a cross-section through a thrust-and-fold belt: the Western Irish Namurian Basin

By
David C. Tanner
David C. Tanner
1
Geoscience Centre, University of Göttingen
Department of Structural Geology and Geodynamics, Goldschmidtstr. 3, D-37077 Göttingen,
Germany
2
Present address:
Leibniz Institute for Applied Geophysics
Stilleweg 2, D-30655 Hannover,
Germany
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Frithjof A. Bense
Frithjof A. Bense
1
Geoscience Centre, University of Göttingen
Department of Structural Geology and Geodynamics, Goldschmidtstr. 3, D-37077 Göttingen,
Germany
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Gabriele Ertl
Gabriele Ertl
1
Geoscience Centre, University of Göttingen
Department of Structural Geology and Geodynamics, Goldschmidtstr. 3, D-37077 Göttingen,
Germany
3
Present address:
Lower Saxony State Authority for Mining, Energy and Geology
Stilleweg 2, D-30655 Hannover,
Germany
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Published:
January 01, 2011

Abstract

The Western Irish Namurian Basin (WINB) developed into a fold-and-thrust belt at the front of the northward-propagating Variscan orogenic wedge. Part of this basin is well exposed along the coast of County Clare, Ireland. From a detailed study that used an integrated GPS mapping approach, we produced a c. 50 km long, balanced cross-section, parallel to the tectonic transport vector. We sequentially decompacted and retro-deformed the Namurian strata in 7 stages to evaluate the palinspastic situation of the basin and the amount of shortening. By using passive markers in the model and a highly-detailed timescale, we were able to determine that shortening of the WINB, from the onset of Central Clare Group sedimentation was 7.44% (or 4.07 km) of which shortening due to folding accounts for c. 2.64% (c. 1.37 km), and therefore c. 4.80% (c. 2.69 km) was solely because of thrusting. The rate of horizontal shortening ranges from 1–34 mm a−1; this is within typical orogenic values.

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Contents

Geological Society, London, Special Publications

Kinematic Evolution and Structural Styles of Fold-and-Thrust Belts

J. Poblet
J. Poblet
Universidad de Oviedo, Spain
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R. J. Lisle
R. J. Lisle
Cardiff University, UK
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Geological Society of London
Volume
349
ISBN electronic:
9781862395978
Publication date:
January 01, 2011

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