北上山地,唐桑半島の中生界の放射能

概要

論文の詳細を見る
Mutual relationship between the intensity of radioactivity (γ ray) and rocks belonging to the Mesozoic and Upper Permian formations developed in the Karakuwa Peninsula, Kitakami Mountains was studied in detail. As a result, it became evident that the higher the intensity in general the higher the stratigraphic level of the sequence of Mesozoic and the Upper Permian formations. Furthermore, within the same formation, rocks of slaty facies show almost always high intensity than sandy and conglomeratic facies. Especially, there is a horizon showing the highest intensity in the upper Kogoshio formation (Upper Jurassic), which is a good key horizon since it is widely traceable in the surveyed area. Dykes, mostly of porphyrite, and sometimes of granodioritic rock, intruded into the Palaeozoic and Mesozoic formations, are definitely low in intensity, compared with the above mentioned country rocks.
地学団体研究会の論文
1978-03-25