Effusive and explosive volcanism on the northern Futuna Ridge, Lau Basin: A combined bathymetric, magnetic and seismic investigation

The Utu Uli Hill, located on the northern Futuna Ridge in the Lau Basin (Southwestern Pacific Ocean), displays recent volcanism in a complex area, possibly the boundary of one of many intermediate platelets between the Pacific and Australian plates or the result of progressive melting and dismantlin...

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Published inJournal of volcanology and geothermal research Vol. 431; p. 107646
Main Authors Szitkar, Florent, Dyment, Jérôme, Pelleter, Ewan, Thomas, Yannick, Marsset, Bruno, Ker, Stephan, Fouquet, Yves
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.11.2022
Elsevier
Subjects
Bathymetry
Earth Sciences
Futuna Ridge
Magnetics
Sciences of the Universe
Seismics
Volcanic edifices
Volcaniclastic domes
Futuna Ridge
Bathymetry
Seismics
Magnetics
Volcanic edifices
Volcaniclastic domes
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ISSN0377-0273
1872-6097
DOI10.1016/j.jvolgeores.2022.107646

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Summary:The Utu Uli Hill, located on the northern Futuna Ridge in the Lau Basin (Southwestern Pacific Ocean), displays recent volcanism in a complex area, possibly the boundary of one of many intermediate platelets between the Pacific and Australian plates or the result of progressive melting and dismantling of the Vitiaz subduction slab. The combination of bathymetric, magnetic and 3D reflection seismic data allows us to recognize and describe several types of submarine volcanoes, namely clustered small volcanoes, flat-topped volcanoes, elongated volcanic ridges, and volcaniclastic domes, and to unravel the geological evolution of the area. Sea-surface magnetic anomalies reveal that the area formed during the last 780 ka, whereas the large variations of amplitude in the near-seafloor, high-resolution magnetic anomalies suggest scattered ages for individual edifices and widespread volcanism within the whole Futuna Ridge. The spectacular volcaniclastic domes initiate only at depth shallower that 1150–1200 m. They show feeder dyke systems and evidence of hydrothermalism at their summit, and are locally affected by collapse structures. •High-resolution bathymetry, magnetics and seismics allow us to investigate volcanoes of the Futuna Ridge•Volcaniclastic domes and volcanic edifices display contrasted geophysical footprints•Spectacular volcaniclastic domes initiate at depth shallower than 1150–1200 m
ISSN:0377-0273
1872-6097
DOI:10.1016/j.jvolgeores.2022.107646