Discrepant results of C-14 and fission track datings for some volcanic products in southern Kyushu

Abstract

Seven charcoals from the Ito pyroclastic flow deposits in southern Kyushu show discordant C-14 ages, ranging from 2,460 to 38,900y. To obtain the upper limit of age for the Ito pyroclastic flow, three obsidians from the Arasaki pumice fall deposits underlying the Ito were dated by fission track method. The ages of the obsidians range from 31,000 to 41,000y. Possible sources of error in the C-14 dating are discussed. © 1972, GEOCHEMICAL SOCIETY OF JAPAN. All rights reserved.