岡山大学 地球科学研究報告
Published by Okayama University Earth Science Reports Editorial Committee

Paleogene talus deposits, Okayama City, Southwest Japan

鈴木 茂之 Department of Earth Sciences, Faculty of Science, Okayama University
抄録
In eastern Chugoku area, Paleogene deposits have not been recognized until fission-track dating of so called "Mountain Gravels" was carried out (Suzuki et al. 1995). Two sedimentation events in Paleogene time (27Ma and 34-35Ma) are inferred by the F-T dating Major lithology of the Paleogene deposits in the study area is graved which is mainly composed of subrounded to rounded cobbles. The "Mountain Gravels" were previously thought to be lower Quaternary deposits. The "Mountain Gravels" is associsted with coal bearing mud, sand, gravel and breccia deposits. The breccia deposits is distributed sporadically between the "Mountain Gravels" and basement rocks. The deposits are mainly composed of poorly sorted breccia and associated granitic sands. It is inferred that the breccia deposits are talus deposits.
キーワード
Paleogene
breccia
talus deposits
fission-track dating
ISSN
1340-7414
NCID
AN10506284