E.N. Grib

Institute of Volcanology and Seismology FED RAS,
Petropavlovsk-Kamchatsky, 683006 e-mail: gen@kscnet.ru

The paper presents some data on composition of minerals-phenocrysts of Karymsky volcanic center basalts hosting olivines, which trace back in the region evolutional history from the Lower Pleistocene to our days. The rock-forming mineral evolutional trenches evidences on co-magmatic character of this basalts and therefore on single long-lived intermediate magma chamber in the structure interior. We revealed also different compositions of solid-phased spinel inclusions in olivine-basalts of the south and north sectors. So we can make a conclusion on possible depths of primary melts magma-generation.