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The interaction between volcanoes and strike-slip, transtensional and transpressional fault zones: Analogue models and natural examples

Mathieu Lucie, van Wyk de Vries Benjamin, Pilato Martin et Troll Valentin R.. (2011). The interaction between volcanoes and strike-slip, transtensional and transpressional fault zones: Analogue models and natural examples. Journal of Structural Geology, 33, (5), p. 898-906.

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URL officielle: https://doi.org/10.1016/j.jsg.2011.03.003

Résumé

Regional strike-slip faulting can control magma movements, deform volcanoes and may destabilise their flanks. The aim of this study is to address this problem by comparing two natural examples, Basse Terre Island volcanoes, Lesser Antilles and Maderas volcano, Nicaragua, with analogue experiments. The field and remote sensing analyses of their structures reveal that Guadeloupe volcanoes, which developed in a 145°-striking sinistral transtensional fault zone, are dominantly fractured in a 090°–120° direction, which is parallel to the maximum principal horizontal stress and to the elongation direction of the summit graben of analogue models. This graben is bordered by the Sigmoid-I fault, or Y shear structure, and has facilitated the formation of the Beaugendre and Vieux-Habitants valleys by faulting, erosion or collapse. This structure has also influenced the injection of dykes and the transport of hydrothermal fluids. The comparison of Maderas volcano with the analogue models confirms that the volcano has developed parallel to a 135°-striking dextral transtensional fault zone and is also gravitationally spreading over a weak substratum. This study illustrates how regional strike-slip faulting and gravitational loading combine to produce a clear set of structures within volcanic edifices, which control the location of intrusive zones, hydrothermal activity and collapse directions.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0191-8141
Volume:33
Numéro:5
Pages:p. 898-906
Version évaluée par les pairs:Oui
Date:2011
Sujets:Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Mots-clés:Strike-slip faults, analogue models, spreading, volcano, Guadeloupe, Maderas, défauts de glissade, modèles analogiques, diffusion, volcan
Déposé le:22 oct. 2019 00:13
Dernière modification:22 oct. 2019 00:13
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