Magmatic Evolution and Source Variations at the Nifonea Ridge (New Hebrides Island Arc)

Morphology and Structure of the Southern Part of the New Hebrides Island Arc System

1) An accretionary prism with a constant width of approximately 75 km does exist; 2) The morphology of this prism varies rapidly along the arc and is linked, firstly to the morphology and structure of the upper part of the dipping plate and, secondly to the presence of volcanic island acting as sediment sources; The island arc and its connecting structural features such as troughs at the rear o...

Magmatic filtering of mantle compositions at mid-ocean-ridge volcanoes

Earth’s dominant form of magmatism occurs at mid-ocean ridges (MORs), producing the igneous crust for two-thirds of the planet’s surface and conveying significant heat and material fluxes from the mantle to the world’s oceans. Mid-ocean-ridge basalt (MORB) magmas form from upwelling compositionally heterogeneous mantle1 by aggregation of near-fractional melts beneath spreading centres2. Multipl...

Evolution of a Submarine Magmatic-Hydrothermal System: Brothers Volcano, Southern Kermadec Arc, New Zealand

Brothers volcano, which is part of the active Kermadec arc, northeast of New Zealand, forms an elongate edifice 13 km long by 8 km across that strikes northwest-southeast. The volcano has a caldera with a basal diameter of ~3 km and a floor at 1,850 m below sea level, surrounded by 290to 530-m-high walls. A volcanic cone of dacite rises 350 m from the caldera floor and partially coalesces with ...

Morphostructure at the junction between the Beata ridge and the Greater Antilles island arc (offshore Hispaniola southern slope)

Interpretation of Gloria Sidescan Sonar Imagery for the Coriolis Troughs and the New Hebrides Back-arc

........................................................................................................................ 5 ACKNOWLEDGEMENTS ....................................................................................................... 6 INTRODUCTION ................................................................................................................... 7 GEOLOGICALSETTING .....