Abstract
The occurrence of short-term variations of Sr isotopic ratios in the Vesuvian historical lavas, and the occurrence of different types of nodules, which formed in different P-T conditions, permit the identification of two different deep magmatic reservoirs. The cumulative effusion rate of Vesuvius between 1694 and 1944 allows a calculation of the magma production rate in the same period. Based on these data, a model of the Vesuvian feeding system is presented. Between 1754 and 1944 mixing of magmas probably occurred in two deep-seated magma reservoirs. We calculated the volume of such reservoirs (∼ 0.1 km 3). The increased effusion rate of Vesuvius after 1858 is nicely explained by the simultaneous activity of both reservoirs. Geometrical constraints on the Vesuvian conduit are also discussed.
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