ИСТИНА

In order to investigate an influence of alkali-chloride components on modification and partial melting of the Al2O3, CaO, and Na2O-enriched water-saturated peridotite, and stability of garnet, pyroxenes, and amphibole in it, in particular, experiments on interaction of the model CMAS pyrolite Fo57En17Prp14Di12 (+0.8 wt. % Na2O) with the H2O-NaCl fluids were carried out. The experiments were conducted at following parameters: (1) 2.0 GPa and 850-1200 °С using a piston-cylinder apparatus; (2) 6.0 GPa and 1100-1450 °С using a torroidal anvil-with-hole apparatus. The 2.0 GPa experiments showed an active influence of chlorides on the solidus of the water-saturated pyrolite, as well as on stability of new phases (mostly, amphibole). Influence of NaCl on phase relations in the water-bearing peridotite can be explained by solubility of Cl in the Ca and Na-rich melt and by amphibolestabilizing effect of Na. Preliminary experiments on influence of NaCl on melting of the water-bearing peridotite at 6.0 GPa were performed.