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This paper explores the unobstructive growth of erupting Andean volcanoes from the Pb isotope mixture of gases. To reconstruct the mean composition of degassing magmas, gas condensates and Pb-rich solid deposits gathered in 2018 in the bottom of El Misti crater at 260-150°C fumarole vents were used. On the other hand, the tiny but significant difference between the instantaneous composition discovered in gas condensates and the time-integrated composition found in solid deposits suggests to degassing of less evolved magmas over the past two decades. This pattern is attributed to a recent recharge of El Misti reservoir with hot mafic magmas, in accordance with the evolution of fumarolic deposit mineralogy in the last half a century. Assimilation-fractional crystallization occurs, the Pb isotope component of gas seems to be a promising probe into the uninhibited magmatic evolution of quiescent volcanoes.
Source link: https://doi.org/10.1007/s00445-021-01521-9
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