日本の夾炭層に発達する火山碎屑岩の層準

概要

論文の詳細を見る
Recently, I found the possiblity that the volcanic detritus incorporated in the definite horizons of cyclothemic arrangement may be an important clue to know the mechanism forming the cyclothems in the coal bearing strata in Japan. Summarizing the data on the horizons of the volcanic detritus in the coal bearing strata of typical coal-fields in Japan, the following can be stated. (1) Thick tuff, tuff breccia, agglomerate, lava flow incorporated in the basal conglomerate or its lower horizon. (2) Thin tuff incorporated in the coal seam or its upper and under layers partly, also in the thin alternation of siltstone and sandstone. (3) Marine and brackish sediments may be incorporated in the same horizon between thick tuff, agglomerate, etc., but the former occurs in a lower horizon than the latter.
東北大学の論文
1960-05-05