0 Igneous rocks at Tyrnyauz comprise an older (Late Paleozoic) "trondhjemite" plutonic suite of quartz diorite to tonalite-granodiorite and plagiogranite, and a younger (Neogene) plutonic to subvolcanic leucogranite-rhyolite suite of leucocratic granite, biotite (Eldzhurty) granite, rhyolite (rhyolite-dacite), vitroandesite, and Get Price 