The concentration of carbon in primary mid-ocean ridge basalts (MORBs), and the associated fluxes of CO2 outgassed at ocean ridges, is examined through new data obtained by secondary ion mass spectrometry (SIMS) on 753 ...

We report microanalysis of volatile and trace element compositions, as well as Fe3 /?Fe ratios, from 45 basaltic glasses from cruise RC2806 along the equatorial Mid-Atlantic Ridge. The along-strike variations in volatiles ...

In the Mariana convergent margin, large arc volcanoes disappear south of Guam even though the Pacific plate continues to subduct and instead, small cones scatter on the seafloor. These small cones could form either due to ...

On 1 January 2008 Llaima volcano, a basaltic andesite stratocone in southern Chile, entered a phase of violent Strombolian eruption. Llaima, like many passively degassing systems, has experienced prolonged (decades-long) ...

Subduction zone basalts are more oxidized than basalts from other tectonic settings (e.g., higher Fe3 +/â^'Fe), and this contrast may play a central role in the unique geochemical processes that generate arc and continental ...

The oxygen fugacity (f(O2)) of the oceanic upper mantle has fundamental implications for the production of magmas and evolution of the Earth's interior and exterior. Mid-ocean ridge basalts and peridotites sample the ...

The composition of the continental crust is closely tied to subduction zone magmatism. Elevated oxygen fugacity ( f O 2 ) plays a central role in fostering crystallization of oxide minerals and thereby aids in generating ...

Arc basalts have a higher proportion of Fe in an oxidized state (Fe3+) relative to Fe2+ compared to mid-oceanic ridge basalts (MORBs), likely because slab-derived fluids oxidize the mantle wedge where subduction zone magmas ...

Mantle oxygen fugacity exerts a primary control on mass exchange between Earth's surface and interior at subduction zones, but the major factors controlling mantle oxygen fugacity (such as volatiles and phase assemblages) ...