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Chapter 19 Magma storage region processes of the Soufrière Hills Volcano, Montserrat

Abstract Backscattered electron (BSE) imaging and chemical analysis of minerals and glasses in andesitic tephra produced by the 11 February 2010 explosive eruption of the Soufrière Hills Volcano (SHV), Montserrat indicate that magma in the pre-existing magma storage region had been heated from approximately 825 to 835 °C prior to the eruption. The evidence for the heating comes from Fe–Ti oxide geothermometry, compositional zoning profiles in Ti-magnetite and in amphibole crystals, and the absence of quartz in this magma compared to eruptions in 1995–2005. Potentially, global heating of magma in the storage region may influence magma rheology and eruptive styles, and volumes of any future eruptions. Addendum: An appendix was added to the above article after the review process. This is contrary to the Society's requirements that all published material is peer-reviewed. The appendix discusses the work of other research groups in a way that the Society considers to be inappropriate. The research groups whose work is discussed contest the statements in the appendix and will submit a discussion to Journal of the Geological Society. Once the discussion is accepted and published in the journal, a reference to it will appear under the abstracts of the online Memoir chapter. In addition, the reference to Devine (2006) implies that it is a report. In fact it is an e-mail from Professor Devine to Dr Loughlin, then acting Director of MVO, part of which is quoted in the appendix, and should therefore not be considered part of the scientific literature.