湖盆の地殻変形の問題

Abstract

In this paper the writer dealt with the minor crustal deformation which took placeduring historic and pre-historic time. The basis of this study is the paleolimnologicaldata, particularly geochemical one, in the core sample of Lake Yogo-ko. The writerused Phosphorus (inorganic) content and residue content as an indicator of the precip-itation and Nitrogen content as a marker of the trophic stage, I. E. oligotrophy andeutrophy corresponding to the precipitation in this closed lake, and Carbon content asan indicator of the amount of allochthonous organic material. After examining theclimatic influence, the writer picked up two low N/C horizons which do not correspondto the climatic events; he regards them as the result of the minor crustal deformationin this tectonic lake of Yogo.