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A Structural Section across the Variscan Fold Belt, Southwest Ireland

David Naylor
Journal of Earth Sciences
Vol. 1, No. 1 (1978), pp. 63-70
Published by: Royal Irish Academy
Stable URL: http://www.jstor.org/stable/30002114
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A Structural Section across the Variscan Fold Belt, Southwest Ireland
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Abstract

A structural cross-section is presented which extends across the Variscan fold belt in southwest Ireland between Sherkin Island on the south coast and Castleisland, County Kerry in the north. The cross-section is divided into two parts by a zone of faults in the Lough Leane (Killarney) area, often taken as the line of the Variscan 'thrust front', but which are more probably high angle reverse or wrench faults. To the south the line of cross-section transects a region of thick Old Red Sandstone non- marine sequences and Lower Carboniferous marine clastic deposits folded into a series of major open asymmetrical anticlinoria and synclinoria. There is an important change of fold vergence in the vicinity of Mount Gabriel near the south coast, to the north of which the Bantry syncline is an important structural low which preserves 500 m of Namurian strata. Basement form and structure may have controlled the symmetry and style of folding, as well as the location of important fault zones, in the Upper Palaeozoic rocks of this southern region. North of the Lough Leane (Killarney) faults the thick Dinantian carbonates are disposed in broad open folds with disharmonic folding in the overlying Namurian beds due to décollement at the base of the Namurian section.

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