Mount Etna: Variations in its internal plumbing |
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| Authors: | A M Duncan J E Guest |
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| Institution: | (1) Geology Section, Luton College of Higher Education, LUI 3JU Luton, UK;(2) University of London Observatory, Mill Hill Park, NW7 2QS London, UK |
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| Abstract: | On the basis of historical records of eruptions and the results of recent volcanological, petrological and geophysical investigations, a model for the internal plumbing of Etna is proposed. It is argued that, over about the last 200 years, hawaiite magma has been fed from a deep-seated crustal reservoir at about 20 km depth to be erupted at the surface with no long term high level storage. This is quite a different model for basaltic plumbing from that suggested for Kilauea Volcano on Hawaii. However, the presence on Etna of ignimbrites, more evolved lavas of mugearite and benmoreite composition, calderas and thick pyroclastic sequences indicates that, at times in the prehistoric past, the style of volcanic activity was different to that of the present. At these times there must have been substantial high level storage of magma in the volcano. It is apparent that the internal plumbing of Etna has varied during the history of the volcano. It is considered that the deep seated crustal reservoir plays an important role in the differentiation of the primitive primary magma.Paper presented at the Symposium  Volcanoes of the Earth and Planets , held at the University of Lancaster, March 17, 1981. |
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