Magmatic ocean-continent transitions

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...

Tectonic, Magmatic, Hydrothermal and Biological Segmentation of Mid-Ocean Ridges

Magnetotelluric Studies of Active Continent–Continent Collisions

Continent–continent collisions are an important tectonic process and have played a fundamental role in the evolution of the modern continents. A combination of geological and geophysical data has provided new constraints on the structure and temporal evolution of these orogens. Magnetotelluric (MT) studies have been an important part of these studies since they can constrain the fluid content a...

Magmatic underplating of crust beneath the Laccadive Island, NW Indian Ocean

S U M M A R Y We investigate the crust and uppermost mantle velocity structure beneath the Laccadive Island through the inversion of teleseismic receiver functions following the neighbourhood algorithm. The velocity structure suggests that the 16-km thick-oceanic crust is underplated by 8-km thick high-velocity layer (Vs ∼ 4.25–4.4 km s−1; Vp ∼ 7.35–7.6 km s−1). The uppermost mantle shear veloc...

A Seismic Refraction and Reflection Study of Continent-ocean Transition beneath the North Biscay Margin

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