Perhaps the first point to address in this chapter is what role, or roles, experimental petrology
can play in understanding the formation of natural diamond. As can be seen from the other …

High-pressure COH fluids have a fundamental role in a variety of geological processes.
Their composition in terms of volatile species can control the solidus temperature and …

Ocean sediments consist mainly of calcium carbonate and organic matter (phytoplankton
debris). Once subducted, some carbon is removed from the slab and returns to the …

Estimates of dissolved CO2 in subduction-zone fluids are based on thermodynamic models,
relying on a very sparse experimental data base. Here, we present experimental data at 1–3 …

The carbonation of serpentinites in the forearc region of the mantle wedge in subduction
zones and of serpentinites within the subducting slab by fluids derived from prograde …

The phase relationships in altered mafic oceanic crust (K2O, CO2 and H2O bearing) have
been investigated to constrain and quantify the processes of carbon transfer from the slab to …

We experimentally investigated the dissolution of forsterite, enstatite and magnesite in
graphite-saturated COH fluids, synthesized using a rocking piston cylinder apparatus at …

Organic matter, showing variable degrees of crystallinity and thus of graphitization, is an
important source of carbon in subducted sediments, as demonstrated by the isotopic …

The valence of carbon is governed by the oxidation state of the host system. The subducted
oceanic lithosphere contains considerable amounts of iron so that Fe3+/Fe2+ equilibria in …

Biogenic carbonaceous material (CM) is the main carrier of organic carbon in the subduction
zone and contributes to COH fluid production and volcanic arc gaseous emissions. Here we …