Middle Pleistocene Stratigraphy of Pyroclastic deposits around the southern base of Kurikoma volcano, Miyagi prefecture, Japan

Abstract

The eruptive products from a caldera cluster are exposed around the southern base of Kurikoma volcano. Most of them were regarded as members of the Neogene Onoda Formation. Tsuchiya et al.(1997) reported these pyroclastic deposits are exposed at Modume Osaki, Miyagi and Uguisuzawa Kurihara, Miyagi. We previously reported the stratigraphy and K-Ar ages for these pyroclastic deposits around Modume(Kuzumaki and Ohba, 2010). In this study, the stratigraphy was newly established for Uguisuzawa area and was correlated with that around Modume area with using petrologic data. Onoda Formation around Uguisuzawa contains five tuff members; Shimatai, Yubama, Chijimisawa, Uguisuzawa, and Aonokisawa Tuffs, in stratigraphic order. Yubama and Chijimisawa tuffs were correlated with those distributed around Modume.