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Journal of the Geological Society; 2007; v. 164; issue.1; p. 99-110;
DOI: 10.1144/0016076492006-008
© 2007 Geological Society of London

Original Article

Laccolithic, as opposed to cauldron subsidence, emplacement of the Eastern Mourne pluton, N. Ireland: evidence from anisotropy of magnetic susceptibility

Carl T.E. Stevenson1, William H. Owens1, Donald H.W. Hutton1, David N. Hood2 & Ian G. Meighan3

1 1Earth Sciences, School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK (e-mail: c.t.stevenson@bham.ac.uk)
2 2BP Exploration Operating Company Ltd., Chertsey Road, Sunbury-on-Thames TW16 7LN, UK
3 333 Marlborough Park North, Belfast BT9 6HJ, UK

The structural evolution and emplacement of the Eastern Mourne pluton was investigated using anisotropy of magnetic susceptibility (AMS) measurements (carried out on 112 oriented block samples) and structural data from the host rocks. From these new data cauldron subsidence, as the emplacement mechanism, is disputed and evidence for an alternative, laccolithic style model involving inflation is presented. This includes deflection and uplift of host-rock bedding close to contacts and the magnetic fabric pattern, which has a gentle dome geometry, even close to contacts. The magnetic lineations usually plunge down-dip near the external margins but otherwise have a general SSW–NNE trend that diverges northward. This suggests a northward-directed inflow direction. The model for the emplacement of the Eastern Mourne pluton is a laterally fed laccolith, emplaced south to north. The eastern margin is interpreted as a faulted contact facilitating the inflation of an asymmetrical ‘breached’ laccolith.




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