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Repeated debris avalanches on Tenerife and genesis of Las Canadas caldera wall (Canary Islands)



Repeated debris avalanches on Tenerife and genesis of Las Canadas caldera wall (Canary Islands)



Geology 27(8): 739-742



Geologic evidence on Tenerife, Canary Islands, indicates six successive north-directed debris avalanche events, including: the Anaga and Teno (ca. 6 Ma) events that affected the old basaltic series, and the Tigaiga (>2.3 Ma), Roques de Garcia (possibly 0.6-0.7 Ma), Orotava (ca. 0.6 Ma), and Icod (<0.15 Ma) avalanche events that affected the Canadas and Dorsal volcanic edifices. The approximate total volume (>1000 km (super 3) ) inferred for these events can account for the volume of previous estimates of offshore volcanic debris. These repeated flank failures can also account for the present morphology of Las Canadas caldera wall, which partly bounds a multiepisodic lateral-collapse structure 25 km wide.

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