BIMETASOMATIC ZONING IN THE CAO-MGO-SIO2-H2O-CO 2 SYSTEM: EXPERIMENTS WITH THE USE OF NATURAL ROCK SAMPLES

Abstract

Experiments reproducing the development of bimetasomatic zoning in the CaO-MgO-SiO2-H2O-CO2 system were conducted at elevated P-T parameters with the use of samples of naturally occurring quartzdolomite and calcite-serpentinite rocks. In order to maintain mass transfer exclusively via the diffusion-controlled mechanism, we used the method of the ensured compaction of the cylindrical sample surface with a thin-walled gold tube. In the course of the experiments, a single diopside zone ∼2.5 × 10−5 m thick was obtained at the quartz-dolomite interface at T = 600°C, ...