Abstract:
:Many volcanoes erupt compositionally homogeneous magmas over timescales ranging from decades to millennia. This monotonous activity is thought to reflect a high degree of chemical homogeneity in their magmatic systems, leading to predictable eruptive behaviour. We combine petrological analyses of erupted crystals with new thermodynamic models to characterise the diversity of melts in magmatic systems beneath monotonous shield volcanoes in the Galápagos Archipelago (Wolf and Fernandina). In contrast with the uniform basaltic magmas erupted at the surface over long timescales, we find that the sub-volcanic systems contain extreme heterogeneity, with melts extending to rhyolitic compositions. Evolved melts are in low abundance and large volumes of basalt flushing through the crust from depth overprint their chemical signatures. This process will only maintain monotonous activity while the volume of melt entering the crust is high, raising the possibility of transitions to more silicic activity given a decrease in the crustal melt flux.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Stock MJ,Geist D,Neave DA,Gleeson MLM,Bernard B,Howard KA,Buisman I,Maclennan Jdoi
10.1038/s41467-020-17590-xsubject
Has Abstractpub_date
2020-07-28 00:00:00pages
3767issue
1issn
2041-1723pii
10.1038/s41467-020-17590-xjournal_volume
11pub_type
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