Forming Processes of Trachytes and Comendites as Part of SubalkalineDifferentiated Series in Sredinny Ridge of Kamchatka
Main subject of the article is research of genetic relations in K–Na subalkaline series that appears in Belogolovsky volcanic center located in the rear part of Sredinny ridge. A differentiated rocks series includes trachybasalts, trachyandesites, trachytes, comenditic- trachytes and comendites. Mass balance calculation and trace elements modeling shows that crystal fractionation is main process in volcanic center evolution and main fractionated mineral is feldspar. Trace elements content characteristics of rockforming minerals (Fsp, Cpx, Bt, Ap, Ol) obtained by LA-ICP-MS method allowed calculating “mineral/rock” partition coefficients for Belogolovsky volcanic center genetic model representation. Genetic connections established between trachyandesites, trachytes, comenditic-trachytes and comendites whereas genetic connections between trachybasalts and trachyandesites was not found.