Institution: | aDepartment of Earth Sciences, University of Durham Science laboratories, South Road, Durham DH1 3LE UK bGeowissenschaftliches Zentrum Göttingen, Goldschmidtstraße 1-3, 37077 Göttingen, Germany cLaboratoire Géodynamique des Chaînes Alpines, UMR5025, Université Joseph Fourier, 1381 rue de la piscine, 38400 Saint Martin D'Hères, France dSchool of Earth and Environment, Earth Sciences building, University of Leeds, LS2 9JT UK |
Abstract: | Integrating isotopic microanalysis with other analytical techniques creates powerful new methodologies for understanding the evolution of rock samples at the sub-grain scale. Here we present Crystal Size Distribution (CSD) data for a 26,000 year old sample from Stromboli Volcano and accompanying isotopic microanalysis of the phenocrysts. A technique, called the ICSD plot, is introduced which given stated assumptions allows the integration of both sets of data to generate timelines of isotopic evolution through the volcanic system. The combined approach is powerful, allowing investigation of the magma supply, mixing, crystallisation and contamination processes prior to eruption of a volcanic sample. For Stromboli Volcano, the combined analysis suggests that the change in magma type following a cone collapse took roughly five years to complete, similar to the timescale of changes seen in recent decades. |