Moseley, DB, Pringle, JK, Haslam, RB, Egan, SS, Rogers, SL, Gertisser, R, Cassidy, NJ and Stimpson, I (2015) Geophysical surveys to help map buried igneous intrusions, Snowdonia, North Wales, UK. Geology Today, 31 (3). 109 -115 (6). ISSN 1365-2451

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The geology of the Snowdonia National Park in North Wales comprises a mixture of Lower Palaeozoic shallow marine sediments, acidic igneous rocks and basic intrusions of the Welsh Basin that were subsequently deformed during the Caledonian Orogeny. Thin igneous intrusions are challenging to map due to variable surface exposures, their intrusive origin, structural deformation and burial by glacial sediments. This study used a combination of traditional geological techniques, near-surface geophysical surveys and remote sensing to detect and map a buried dolerite sheet intrusion. Both simple and mathematical analysis of magnetic anomalies and numerical modelling allowed the dolerite position, depths and target widths to be determined. Results showed that calibrated magnetic surveys can characterise buried igneous bodies in such mountainous environments.

Item Type: Article
Uncontrolled Keywords: dolerite sheet intrusion
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
Divisions: Faculty of Natural Sciences > School of Geography, Geology and the Environment
Depositing User: Symplectic
Date Deposited: 29 May 2015 08:51
Last Modified: 04 Mar 2020 14:00

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