Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Large eruption-triggered ocean-island landslide at Tenerife; onshore record and long-term effects on hazardous pyroclastic dispersal

Pablo Davila Harris, Michael J. Branney and Michael Storey
Large eruption-triggered ocean-island landslide at Tenerife; onshore record and long-term effects on hazardous pyroclastic dispersal
Geology (Boulder) (October 2011) 39 (10): 951-954

Abstract

An extensive debris-avalanche deposit has been discovered on Canadas volcano, Tenerife (Canary Islands). The onshore component of the 733 + or - 3 ka Abona landslide deposit exposes classic block facies and mixed facies across 90 km (super 2) . Three lines of evidence together show that the avalanche was triggered by an ignimbrite-forming explosive eruption: (1) the deposit is enclosed by phonolitic ignimbrites and is draped by a Plinian fallout layer, all within a single eruption unit; (2) it contains prismatic-jointed pumice blocks that were hot during landslide emplacement, indicated by chilled rims and breadcrust surfaces; (3) these blocks yield the same (super 40) Ar/ (super 39) Ar date as the associated ignimbrite and fall deposit. Landslide hummocks dammed surface water, forming ephemeral lakes perched on the volcano flank. Phonolite dome growth destabilized the southeast sector of a mid-Pleistocene Canadas caldera wall and created a major breach that affected the passage of destructive pyroclastic density currents on Tenerife for 0.5 m.y., showing that landslides can have enduring consequences for pyroclastic dispersal and hazards.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 39
Serial Issue: 10
Title: Large eruption-triggered ocean-island landslide at Tenerife; onshore record and long-term effects on hazardous pyroclastic dispersal
Affiliation: University of Leicester, Department of Geology, Leicester, United Kingdom
Pages: 951-954
Published: 201110
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 21
Accession Number: 2011-097150
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2011279
Illustration Description: illus. incl. sect., sketch maps
N28°15'00" - N28°15'00", W16°34'60" - W16°34'60"
Secondary Affiliation: Roskilde University, DNK, Denmark
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201150
Close Modal

or Create an Account

Close Modal
Close Modal