Magma chamber recharge at Vesuvius
(29 September 2006)
A new paper in Geology by Daniel Morgan and others, including Jon Davidson, identifies three magma chamber recharge events in the century before the AD79 eruption of Vesuvius. The work analysed the concentration of barium in sanidine crystals, including modelling of diffusion profiles within individual crystals. The most recent recharge event occurred ~20 years before the actual eruption. It is very interesting that the timescales of recharge seem to correspond to a seismic event recorded ~17 years prior to the AD 79 eruption, so we may be witnessing a geochemical fingerprint of a geophysical event. Reference: DJ Morgan et al., Geology, v34 p845-848 (2006).