Lvinaya Past has erupted tholeiitic magmas with a low potassium content.: Other rocks include andesite, basaltic andesite, basalt, dacite and picrite. The caldera-forming eruption ejected dacitic material with hornblende and quartz forming phenocrysts.: Other volcanoes on Iturup include Astonupuri, Baransky, Berutarube, Bogatyr Ridge, Chirip, Demon, Golets-Tornyi, Grozny Group, Medvezhy and Past.: