Bazman volcano is constructed by dacite, but andesite has also been mentioned. Minor amounts of rhyolite have also been reported. Overall rock samples range from basalt to rhyolite in composition and are mostly of calc-alkaline composition. The satellite cones have erupted olivine-containing basalts. The mountain's flanks are covered by a layer of detritus, burying most of the flanks to over of altitude. Most of this detritus is erosional in nature, but pyroclastic rocks created by explosive activity and hot avalanches of extruded lava also contribute. thick olivine basalt found in the Jaz Murian depression may also come from Bazman. Basalt has also been found at one cryptodome. North of Bazman, andesites of Miocene-Eocene age are partly buried beneath the volcano and there are also andesitic to dacitic intrusions. Carboniferous and Permian metamorphic rocks form the oldest basement at Bazman.