Exceptional mobility of an advancing rhyolitic obsidian flow at Cordon Caulle volcano in Chile:observations from Cordón Caulle, Chile, 2011-2013.

Tuffen, Hugh and James, Michael and Castro, Jonathan and Schipper, C. Ian (2013) Exceptional mobility of an advancing rhyolitic obsidian flow at Cordon Caulle volcano in Chile:observations from Cordón Caulle, Chile, 2011-2013. Nature Communications, 4. ISSN 2041-1723

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Abstract

The emplacement mechanisms of rhyolitic lava flows are enigmatic and, despite high lava viscosities and low inferred effusion rates, can result in remarkably, laterally extensive (>30 km) flow fields. Here we present the first observations of an active, extensive rhyolitic lava flow field from the 2011–2012 eruption at Cordón Caulle, Chile. We combine high-resolution four-dimensional flow front models, created using automated photo reconstruction techniques, with sequential satellite imagery. Late-stage evolution greatly extended the compound lava flow field, with localized extrusion from stalled, ~35 m-thick flow margins creating >80 breakout lobes. In January 2013, flow front advance continued ~3.6 km from the vent, despite detectable lava supply ceasing 6–8 months earlier. This illustrates how efficient thermal insulation by the lava carapace promotes prolonged within-flow horizontal lava transport, boosting the extent of the flow. The unexpected similarities with compound basaltic lava flow fields point towards a unifying model of lava emplacement.

Item Type:
Journal Article
Journal or Publication Title:
Nature Communications
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
67152
Deposited By:
Deposited On:
10 Oct 2013 13:26
Refereed?:
Yes
Published?:
Published
Last Modified:
11 Jun 2020 02:52