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Volcano destabilization by magma injections in a detachment

Vincent Famin and Laurent Michon
Volcano destabilization by magma injections in a detachment
Geology (Boulder) (March 2010) 38 (3): 219-222


We report the discovery of a detachment fault within reach of structural investigation in a shield volcano (Piton des Neiges, La Reunion hotspot). The detachment, exposed by erosion, is located between the top of an extinct gabbroic magma chamber and a cover of debris avalanche deposits. The fault simultaneously concentrated ductile and brittle deformation toward the sea, hydrothermal alteration in the greenschist facies, and repeated sill injections of basic magmas. Our study of this exceptional detachment exposure suggests that two mechanisms participate in volcano flank failure: hydrothermal alteration, likely sustained by the heat of cooling sills, induces slow inter-intrusion deformation, whereas sill injections in the fault may trigger rapid cointrusive slip. This twofold process of destabilization might currently occur on some active volcanoes such as Piton de la Fournaise.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 38
Serial Issue: 3
Title: Volcano destabilization by magma injections in a detachment
Affiliation: Universite de la Reunion, Laboratoire Geosciences Reunion, St. Denis, Reunion
Pages: 219-222
Published: 201003
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 29
Accession Number: 2010-030924
Categories: GeomorphologyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2010060
Illustration Description: illus. incl. sect., sketch map
N21°04'60" - N21°04'60", E55°28'00" - E55°28'00"
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: 201018
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