Stratigraphy of the scoria cone and the basemental morphology of the Takurayama volcano, northern Kinki district, Japan

Abstract

The Takurayama volcano is composed of lava plateaus and a scoria cone. The lavas are classified into three members, the Ogura, Kinuzuri and Takurayama lavas in ascending order. The scoria cone was formed after the eruption of the Takurayama lava. As the scoria is deeply weathered, the stratigraphic correlation using heavy minerals is difficult. The chemical composition of the preserved Fe-Ti oxides in scoria and lavas revealed that the scoria cone was genetically related with the Takurayama lava. The geological section along the Yakuno Tunnel is reinvestigated based on the petrographical study of core samples, and the basemental upheaval is not identified.