Evolution of the magmatic plumbing system at Mt Etna: new evidence from gravity and magnetic data |
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| Authors: | PJ Rollin J Cassidy CA Locke & H Rymer |
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| Institution: | Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK. Present address: ARK Geophysics Ltd, Wolverton Mill, Milton Keynes MK12 5EU, UK.;Department of Geology, The University of Auckland, Private Bag 92019, Auckland, New Zealand;Department of Geology, The University of Auckland, Private Bag 92019, Auckland, New Zealand;Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK |
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| Abstract: | New gravity and aeromagnetic data from Mt Etna volcano are presented which provide evidence for and constraints on relatively dense, high magnetization bodies at shallow levels below the summit craters. These are modelled and interpreted in terms of dyke/sill complexes, which may be the sites of short-term magma storage. A similar but larger body with high density and high magnetization is modelled below the southern wall of the Valle de Bove and may be the remnant of a prehistoric storage system. This body is close to the Valle del Bove, a major collapse feature, and may have influenced its geometry by buttressing and/or focusing zones of weakness. |
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