We review data and recent research on arc composition, focusing on the relatively complete
arc crustal sections in the Jurassic Talkeetna arc (south central Alaska) and the Cretaceous …

Tethyan ophiolites show an apparent poorly organized association of ultramafic and mafic
rocks. By contrast to the complete mantle-crustal sections of Semail-type ophiolite sheets …

Oceanic core complexes are the uplifted footwalls of very-large-offset low-angle normal
faults that exhume lower crust and mantle rocks onto the seafloor at slow-spreading ridges …

More than half a gigaton of CO2 is subducted into Earth's interior each year. At least 40% of
this CO2 is returned to the atmosphere by arc volcanism,,. Processes that are known to …

IODP Hole U1309D (Atlantis Massif, Mid-Atlantic Ridge 30° N) is the second deepest hole
drilled into slow spread gabbroic lithosphere. It comprises 5.4% of olivine-rich troctolites (~> …

Arc lavas display elevated Fe3+/ΣFe ratios relative to MORB. One mechanism to explain this
is the mobilization and transfer of oxidized or oxidizing components from the subducting slab …

The Chenaillet Ophiolite in the Franco–Italian Alps represents a well-exposed ocean-floor
sequence that was only weakly overprinted by Alpine metamorphism during its …

Volcanism is the surface expression of extensive magmatic systems, with their intrusive
counterpart representing~ 80% of the total magma budget. Our knowledge of igneous …

Rainbow is a dome‐shaped massif at the 36° 14′ N nontransform offset along the Mid‐
Atlantic Ridge. It hosts three ultramafic‐hosted hydrothermal sites: Rainbow is active and …

IODP Expedition 357 used two seabed drills to core 17 shallow holes at 9 sites across
Atlantis Massif ocean core complex (Mid-Atlantic Ridge 30° N). The goals of this expedition …