Аннотация:he results of studying the compositions of melts and mineral phases formed during the interaction of amphibolite (according to geochemical characteristics close to E-MORB) with H2O-NaCl±CO2 fluid at 5-7 kbar, 900оС are presented in article. The main phases after experiences are presented by amphibole and a quenching melt; the tiny crystals of Fe oxide with Ti impurity are sometimes noticeable. It is shown that increase in molar fractions of NaCl in an initial fluid leads to growth of contents of SiO2 and (Na2O+K2O) in the resulting melts. Andesite-dacites, melted during the dehydration melting of amphibolite, are replaced by trachydacites and trachytes. The compositions of the melts, obtained both in the presence of the H2O-NaCl fluid and the H2O-NaCl-CO2 fluid, are identical in the contents of the petrogenic components, however, among the mineral phases, a carbonate phase (Ca0.25Fe0.75)CO3 appears along with the amphibole. The results of the experiments are applicable to models of the formation of alkaline melts in oceanic crust rocks.
