A structural outline of the Yenkahe volcanic resurgent dome (Tanna Island, Vanuatu Arc, South Pacific) - Université Clermont Auvergne Accéder directement au contenu
Article Dans Une Revue Journal of Volcanology and Geothermal Research Année : 2013

A structural outline of the Yenkahe volcanic resurgent dome (Tanna Island, Vanuatu Arc, South Pacific)

Olivier Merle
Élodie Brothelande
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Jean-François Lénat
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Patrick Bachèlery

Résumé

A structural study has been conducted on the resurgent Yenkahe dome (5 km long by 3 km wide) located in the heart of the Siwi caldera of Tanna Island (Vanuatu arc, south Pacific). This spectacular resurgent dome hosts a small caldera and a very active strombolian cinder cone - the Yasur volcano - in the west and exhibits an intriguing graben in its central part. Detailed mapping and structural observations make it possible to unravel the volcano-tectonic history of the dome. It is shown that, following the early formation of a resurgent dome in the west, a complex collapse (caldera plus graben) occurred and this was associated with the recent uplift of the eastern part of the present dome. Eastward migration of the underlying magma related to regional tectonics is proposed to explain this evolution.

Dates et versions

hal-00981453 , version 1 (22-04-2014)

Identifiants

Citer

Olivier Merle, Élodie Brothelande, Jean-François Lénat, Patrick Bachèlery, Esline Garaébiti. A structural outline of the Yenkahe volcanic resurgent dome (Tanna Island, Vanuatu Arc, South Pacific). Journal of Volcanology and Geothermal Research, 2013, 268, pp.64-72. ⟨10.1016/j.jvolgeores.2013.10.009⟩. ⟨hal-00981453⟩
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