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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.

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