Abyssal peridotites are ultramafic rocks collected from mid-ocean ridges that are the
residues of adiabatic decompression melting. Their compositions provide information on the …

Knowledge of temperature and pressure, however qualitative, has been central to our views
of geology since at least the early 19th century. In 1822, for example, Charles Daubeny …

The mean composition of mid‐ocean ridge basalts (MORB) is determined using a global
data set of major elements, trace elements, and isotopes compiled from new and previously …

A map of the ocean basins (Fig. 5.1) shows that their most conspicuous topographic feature
is the system of mid-oceanic ridges, the crests of which rise on average 1000-3000 m above …

The average chemical compositions of the continental crust and the oceanic crust
(represented by MORB), normalized to primitive mantle values and plotted as functions of …

When continents rift to form new ocean basins, the rifting is sometimes accompanied by
massive igneous activity. We show that the production of magmatically active rifted margins …

We present an estimate for the composition of the depleted mantle (DM), the source for mid‐
ocean ridge basalts (MORBs). A combination of approaches is required to estimate the …

We present a comprehensive geochemical data set for the most recent volcanics from the
Mariana Islands, which provides new constraints on the timing and nature of fluxes from the …

Melting experiments on fertile peridotite KR4003, a 'pyrolitic'composition, were made from 3
to 7 GPa in piston-cylinder and multi-anvil apparatus. Temperature gradients across the …

Water is a key ingredient in the generation of magmas in subduction zones. This review
focuses on the role of water in the generation of magmas in the mantle wedge, the factors …