Establishment of the total Quaternary tephrostratigraphy in Kanto region, central Japan

点击翻译按钮获取中文摘要

This study aimed to establish the total Quaternary tephrostratigraphy in Kanto region, central Japan, as a part of studies on the construction of Quaternary history in and around Japanese islands. Along the Byobugaura Coastal Cliff (Choshi area, Chiba Prefecture), lithological observation and collection of all visible fall-out tephras positioned in the stratigraphic horizon between 0.9 and 2.0 Ma were carried out, and most tephras were catalogued with characteristic properties.In Tokyo Metropolitan area, lithological observation and collection of visible fall-out tephras in all-cores in Hachioji, Tachikawa and Akishima were performed. Characteristic properties of these tephras were described, and then, correlations with known tephras were attempted. As results, Kd44-Nk, Byobugaura Ob4b-1, Tmg-R4 and SYG tephras were identified. Moreover, Middle Pleistocene Shiobara-Otahara tephra was detected at several locations in Fukushima Prefecture and also found off Shimokita, Tohoku region.