Pb-Sr isotope temporal variations on juvenile ash samples from the last eruptive period of Tungurahua volcano (1999-2016)

Abstract:

Andean volcanic activity consists in long quiescence periods interrupted by violent explosive eruptions of diverse intensity, magnitude and duration. Anticipating these transitions between low energy eruptions and violent major explosions is a challenge for modern volcanology. Many parameters could play a role in explaining these fast transitions, such as the conduit process (degassing and microlite crystallizations) but also deeper processes (crustal assimilation, nature of the mantle-derived primitive liquids). Geophysical methods (seismic, acoustic, heat flow, ground deformation, gas emissions) are currently used by volcano observatories in order to identify unrest phases at medium to short time-scale. Furthermore, the evolution of pre-eruptive magmatic reservoirs is often studied via micro-petrological techniques, such as the detailed study of growth-zoned crystals emitted during paroxysmal phases. These …

Año de publicación:

2019

Keywords:

Fuente:

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