八ガ岳のゼノリス

概要

論文の詳細を見る
Many xenoliths from the Yatsugatake Volcanic Chain, which traverses the main geotectonic structures of the central part of the Japanese Islands (Fig.1), have been examined microscopically (Tables 1-5), and some differences in the kind of xenoliths between the Southern and Northern areas of the Volcanic Chain are elucidated (Table 6). In the Northern area xenoliths of gabbros and plagioclase-pyroxene rocks are predominant, while those from the Southern area are characterized by many clastic quartzo-feldspathic rocks associated with some crystalline schists, which are entirely absent in the former area. These facts seem to suggest that the volcanoes of the Southern area have a resemblance to those of the outer side of Northeast Japan not only in the mode of eruptions and petrographic characteristics but also in the construction of the basement rocks.
日本地質学会の論文
1976-12-30