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The processes operating in the development of chemical zonation in silicic magma chambers have been addressed with a Sr–Nd–Pb–Hf–Th isotope study of the chemically zoned trachyte pumice deposit of the Fogo A eruption, Fogo volcano, Azores. Sr isotopic variation is observed in whole rocks, glass separates and sanidine phenocrysts (whole-rock 87Sr/86Sr: 0·7049–0·7061; glass 87Sr/86Sr: 0·7048–0·7052;...

journal of petrology

The Role of Open-System Processes in the Development of Silicic Magma Chambers: a Chemical and Isotopic Investigation of the Fogo A Trachyte Deposit, Sao Miguel, Azores