Rhyolite lava flow (Puyehue-Cordón Caulle, 2013)
The dark material is the front of a lava lobe from the 2011-2013 eruption, as it encroached on a nearby ash-covered ridge (the light coloured material). The flow is several tens of metres thick, with an irregular surface comprising massive blocks of lava. The point cloud shown is a small section of a larger reconstruction that covers several kilometers of the flow.
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Tuffen, H., James, M. R., Castro, J. M. and Schipper, C. I. (2013) Exceptional mobility of an advancing rhyolitic obsidian flow at Cordón Caulle volcano in Chile, Nature Comms., 4, 2709, doi:10.1038/ncomms3709
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