Emplacement of sub-volcanic cone sheet intrusions

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http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/16843 http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/16843 http://eprints.org/relation/ispreviewThumbnailVersionOf http://etheses.bham.ac.uk/id/document/16843 archive 4031 disk0/00/00/30/42 2011-11-28 12:58:43 2019-01-23 09:55:24 2011-11-28 12:58:43 thesis show 0 Magee Craig Stevenson Carl O'Driscoll Brian Reston Tim University of Birmingham Emplacement of sub-volcanic cone sheet intrusions unpub QE 10col_life Sub-volcanic intrusive networks, of which cone sheets are recognised as a major constituent, control volcano growth and eruption style. The accepted cone sheet model is that these confocally dipping intrusions originate from an unexposed central magma chamber through dip-parallel magma flow. However, the emplacement mechanism of cone sheets has remained poorly understood. The classic ~58 Ma cone sheet swarm of Ardnamurchan, NW Scotland, offers an excellent opportunity to further resolve the emplacement dynamics of cone sheets through studying their magma flow. Structural measurements and anisotropy of magnetic susceptibility (AMS) analyses have constrained a lateral magma flow regime, consistently oriented NW-SE, in the majority of the Ardnamurchan cone sheets. This is not consistent with previous emplacement models. In this thesis, it is suggested that emplacement of the Ardnamurchan cone sheets occurred through the deflection of laterally propagating, NW-SE trending regional dykes, sourced from laterally adjacent magmatic systems (likely the Palaeogene Mull central complex). Field observations highlight the importance of host rock structure and interference between locally compressional and regional extensional stress fields in controlling intrusion geometry. Implicitly, edifice construction and potential eruption precursors observed at a volcano may instigate, or result from, magmatic activity in laterally adjacent volcanic systems. 2011-12 2011-09 graduation eng author unchecked This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. public 352 University of Birmingham School of Geography, Earth and Environmental Sciences, Department of Earth and Environmental Sciences d_ph na 2011-12 graduation