A structural outline of the Yenkahe volcanic resurgent dome (Tanna Island, Vanuatu Arc, South Pacific) - Archive ouverte HAL Access content directly
Journal Articles Journal of Volcanology and Geothermal Research Year : 2013

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

Olivier Merle
Élodie Brothelande
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  • PersonId : 966074
Jean-François Lénat
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  • PersonId : 854451
Patrick Bachèlery

Abstract

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 and versions

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

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Cite

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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