Abstract: Canik volcanics consist of generally basaltic and locally andesitic rocks. Basaltic rockscontain plagioclase, pyroxene and olivine phenoerysts, with a groundmass of piagioelase, olivine, pyroxene and opaque mineral microlites and volcanic glass; andesitic rocks contain small plagioclase andpyroxene phenocrysts with a groundmass of plagioclase, pyrexene and opaque mineral microlites.Samples of basaltic rocks indicate that they have subalkaline character with respect to their totalalkalies-silica contents; tholeiitic series character with respect to Äl2Qrnormativ6 plagioclase compostt ions; cotaminated magma tic character with respect to ¥1 and F2 discriminant functions; and a complexpetrochemhical character pointing to a sialic origin with respect to % values. Incompatible and traceelement chemistry (particularly K, Ti, Rb, Sr, Zr, Y, Nb contents and Ti/Y, Zr/Y, Y/Nb, K/Rb ratios)indicate that voleanies show similarities to continental tholeiitic basalts and they are subjected to theprocesses of crustal contamination and magmatic differentiation.With all these petrochemical data, it is thought that Canik volcanics are related to underplatingwhich was developed by partial melting of the up the effects of compression tectonics and originatefrom a magma of gabbroic composition which is formed by the intrusion of picritic source magma,which was devloped by partial melting of the upper mantle, in  the upper levels of crust-mantleboundary as a series of sills and its differentiation,