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• W2892283985 abstract "Abstract The dominant fragmentation mechanisms in the magma involved in a volcanic eruption can be understood from the compositional and textural analysis of the fragments emitted as pyroclasts. Individual pyroclasts can be juvenile, accessory and accidental, and detailed analyses of their relative proportions as well as the juvenile clast features can shed light into the fragmentation processes involved in the eruption. Despite the multiple (hundreds) eruptive pulses since the Nevado del Ruiz re-activation in 1984, following a quiescence of nearly 100 years, such analyses have not been carried out for the ash emissions preceding the recently emplaced plug. Here, four deposits related to the recent emissions were analysed from their pyroclasts. The samples correspond to eruptive pulses from the years 1985, 1986, 1988, and 2012. Their characterisation allowed proposing differences between likely juvenile fragments (i.e. representative of involved magma) and accessory fragments (i.e. pre-existing co-magmatic). The results indicate that alteration can be used as a criterion to distinguish them. Although this could not account for syn-eruptive hydrothermal alteration of juvenile glass, or for the preservation of accessory glass emplaced in glacial conditions, this criterion could serve as a foundation to direct fresh glass fragment analyses. Following this criterion, the fresh glass fragments, which are assumed to be juvenile fragments, are highly vesicular. They exhibit spongy and fibrous textures that are related to the predominant vesicle shape. Their predominance suggests a magmatic fragmentation mechanism, while blocky-shaped, poorly vesicular, cracked glass shards suggest a phreato-magmatic origin. Specifically, November of 1985 and January of 1986 glassy ashes are primarily highly vesicular, suggesting magmatic explosive events. By contrast, samples from the March of 1988 and May of 2012 events are primarily characterised by low fresh glass content. They also exhibit quenched surfaces, indicating that the magma-water interaction acted as an important factor for triggering the eruptive pulses. Real-time componentry, petrography, and glass characterisation in fine ash could significantly complement traditional geophysical monitoring, and importantly, improve the hazard assessments on the civil aviation during the ongoing Nevado del Ruiz activity." @default.
• W2892283985 created "2018-09-27" @default.
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• W2892283985 date "2018-09-01" @default.
• W2892283985 modified "2023-10-14" @default.
• W2892283985 title "Finding eruptive mechanisms through pyroclasts from the current eruption (1984–present) at Nevado del Ruiz Volcanic Complex, Colombia" @default.
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• W2892283985 doi "https://doi.org/10.1016/j.jvolgeores.2018.09.003" @default.
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