The evolution of the magmatic system of Stromboli volcano during the Vancori period (26-13.8 ky)

The main stratigraphic discontinuities within the Vancori sequence are clearly reflected by changes in bulk-rock and mineral chemistry, and evidence of textural and thermodynamic disequilibrium (calculated temperatures) in the eruptive products. On the basis of these data the Lower and Middle Vancori periods of the eruptive history of Stromboli appear to be characterised by an open magma chamber system repeatedly re-filled with basaltic magma, which was continuously being erupted. At the end of the Middle Vancori period the system became closed, corresponding to a period of dormancy of the volcano, and fractional crystallisation dominated. Following a major flank collapse of the volcanic edifice, the Upper Vancori eruptive products show the most extreme range in bulk-rock chemistry as the chamber was progressively flushed with new basaltic magma.