Abstract
The writer has undertaken physical and chemical studies on the Neogene deposits distributed in Northeastern Honshu with the purpose of sedimentary petrology and environmental relationship.
During these studies he was interested in problems concerning the sedimentary facies in the basin. Actually, the writer has been studying on iron ion in the Neogene sedimentary rocks. In this paper he describes his provisional criteria for analysis of iron ion in sedimentary rocks, with his basic considerations and laboratory experiments.
The results do not explain the differeces in the properties of the iron ion and, therefore, the source rocks themselves in the different areas can not be strictly differentiated and identified. It should be pointed out that selective concentration of the iron ion in the present areas and the vertical (stratigraphical) and the horizontal (local) concentration of those iron ion are considered to be one of the environmentel factors for the formation of those source rocks.
With the accumulation of the further data it is hoped to be able to make clear the environmentel relationship existing between the volcanics characterizing marginal part of the basin and the normal sedimentaries characterizing the marine-fresh water environments.
