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Geophysical surveys to help map buried igneous intrusions, Snowdonia, North Wales, UK

Moseley, DB; Pringle, JK; Haslam, RB; Egan, SS; Rogers, SL; Gertisser, R; Cassidy, NJ; Stimpson, I

Geophysical surveys to help map buried igneous intrusions, Snowdonia, North Wales, UK Thumbnail


Authors

DB Moseley

RB Haslam

NJ Cassidy



Abstract

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.

Journal Article Type Article
Publication Date May 15, 2015
Publicly Available Date Mar 28, 2024
Journal Geology Today
Print ISSN 0266-6979
Publisher Wiley
Pages 109 -115 (6)
DOI https://doi.org/10.1111/gto.12096
Keywords dolerite sheet intrusion
Publisher URL http://onlinelibrary.wiley.com/journal/10.1111/%28ISSN%291365-2451

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