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  • Paisley et al 2019 Volcanica

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Degassing-induced chemical heterogeneity at the 2011-2012 Cordón Caulle eruption

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • Rebecca Paisley
  • Kim Berlo
  • Jack Whattam
  • C. Ian Schipper
  • Hugh Tuffen
<mark>Journal publication date</mark>26/11/2019
Issue number2
Number of pages27
Pages (from-to)211-237
Publication StatusPublished
<mark>Original language</mark>English


Low H2O concentrations preserved in the erupted products from the 2011-2012 eruption at Cordón Caulle, Chile, have limited its use as a recorder of the shallow degassing processes responsible for the observed hybrid activity. However, volatile trace element heterogeneity (e.g. Li, Pb, Tl) is observed in different textural domains (e.g. breccias, tuffisites), which each represent the competing processes of fracturing, gas fluxing and melt relaxation occurring at different locations within the upper conduit. Elemental depletions in tuffisite veins record scavenging of metals by the fluxing gas phase. Preserved concentration gradients indicate deep-conduit degassing events are short-lived (~minutes), whilst late-stage activity involves hours of gas venting from a single location. Later-erupted material is more degassed than earlier-erupted bombs indicating a progressive loss of volatiles with eruption duration. Combining in situ textural and volatile trace element analyses can constrain evolving degassing processes in systems that are depleted in H2O and CO2