JaLCDOI 10.18926/ESR/13916
Title Alternative Landslide occurrence and geology of the Triassic Nariwa Group, Southwest Japan
FullText URL ESR_4_21.pdf
Author Hotani, Shu| Suzuki, Shigeyuki| Tanaka, Hajime| Yamada, Takuya|
Abstract Geological and topographical study of landslides in the Triassic Nariwa Group has been carried out. Nariwa Group is mostly composed of non-marine deposites and is characterized by cycle of fining upward successions. Landslides abundantly occur in the non-marine successions. Slip surface occure in coaly mudstones that have conspicuously less strength than sandstones. Creeps immediately below slip surfaces contribute to the occurrence of landslides in the Nariwa Group.
Keywords Iandslide Nariwa Group coaly mudstone
Publication Title Okayama University Earth Science Report
Published Date 1997-09-20
Volume volume4
Issue issue1
Start Page 21
End Page 32
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310343
JaLCDOI 10.18926/ESR/13874
Title Alternative Distributions and ages of the Paleogene deposits in the Kibi Plateau Area, and Paleogene paleogeography
FullText URL earth_science_reports_010_1_15.pdf
Author Tanaka, Hajime| Suzuki, Shigeyuki| Hotani, Shu| Yamamoto, Yasuo| Danhara, Tohru|
Abstract The "Kibi Plateau" forms a unique geomorphic province with the gently-sloping and stable continental feature. Gravel deposites called the "Mountain Gravels", are distributed sporadically in the Kibi Plateau, and have been considered Pliocene deposits. However, recent fission-track ages of the tuff beds intercalated in the deposits have indicated that the ago of deposits are Paleogen in the age. So far, fission-track ages (using zircon) of 61 to 65, 55, 37, 34 to 35 and 27 Ma are obtained. Remaining the belt-like distributions of the Paleogene gravelly valley-full deposits suggest that the Kibe Plateau has been keeping as a stable block, and repeated periods of incision followed by sedimentation of valley-fill deposits are occurred in the area during Paleogene period.
Keywords Kibi Plateau gravelly valley-fill deposites fission-track ages Paleogene palaeogeography
Publication Title Okayama University Earth Science Report
Published Date 2003-12-20
Volume volume10
Issue issue1
Start Page 15
End Page 22
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310517