Our knowledge of the Earth’s structure is based upon seismological data. Comparison between laboratory data and seismological data can provide information about the chemistry and mineralogy of Earth’s interior. Silicate perovskite and (Mg,Fe)O are likely to be important constituents of the lower mantle (e.g., Anderson 1989). Because of its wide stability field and its simple rocksalt structure ...

The eutectic mineral assemblage calcite-dolomitepericlase-apatite-forsterite-magnesioferrite-pyrrhotite-alabandite in a carbonatite dike within the Oka complex, Quebec, buffers the fugacities (and partial pressures) of all gas species in C-O-H-S-F, assuming vapor saturation. At the inferred eutectic (640 ~ C, 1 kbar), the most important gas species and their partial pressures (bars) were: H20, ...

We conducted uniaxial compression and grain growth experiments on fine-grained forsterite (Mg2SiO4) + 10 vol% periclase (MgO) aggregates. This aggregate is a unique polymineralic system in which all of the constituent elements secondary phase constitute primary mineral phase, except for Si, slowest diffusing species phase. Grain aggregates, where presence results boundary pinning proceeds via O...

Abstract Magnesium oxide-based refractory materials are used industrially to contain the chemically aggressive slags present in lead smelting systems. In study an integrated experimental and thermodynamic modeling approach was taken provide fundamental information on chemical reactions taking place these New phase equilibria liquidus data were obtained for PbO–MgO–SiO 2 system air temperature r...