Variations of Source Composition and Melting Degrees of Olivine-Phyric Rocks from Kamchatsky Mys: Results of Geochemical Modeling of Trace Element Contents in Melts

Abstract We conducted the geochemical modeling of trace element contents for primary melts olivine-phyric rocks from Kamchatsky Mys. This reveals substantial chemical heterogeneity their source while average composition is close to enriched DMM (E-DMM). The estimation melting degree in range 9.1 ± 3.8% model modal batch 15.4 5.2% accumulated fractional melting, which slightly higher than primitive mid-ocean ridge basalt (MORB) glasses (7.4 2.2% and 12.5 respectively). It a good agreement with high degrees estimated earlier other Mys ophiolites. Low pressure mantle caused by elevated speed decompression relative MORB could explain Kamhcatsky ophiolites as well characteristic Sr-anomalies sulfide saturation on earliest stages magmatic evolution.