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

这项研究旨在建立日本中部关东地区的第四纪地层，作为日本岛屿及其周围第四纪历史建设研究的一部分。在千叶县长石地区的Byobugaura海岸悬崖沿线，进行了0.9~2.0 Ma地层层位上所有可见落石的岩石学观察和采集，并对大部分可见落石进行了特征特征编目。在东京都地区，对八知寺、立川和秋岛的所有岩心进行了岩性观察和可见落石的采集。描述了这些特指短语的特征属性，然后尝试与已知特指短语进行关联。结果鉴定出Kd44-NK、Byobugaura Ob4b-1、TMG-R4和SYG tephas。此外，在福岛县的几个地点发现了中更新世Shiobara-Otahara Tephra，也在东北地区的Shimokita附近发现了Tephra。

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.