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Title Transcription
シマネケン エシマ ノ コウシンセイ ゲンブガン ト トットリケン ユミガハマ サス ナントウタン アワシマ ノ チュウシンセイ リュウモンガン ノ K-Ar ネンダイ
Title Alternative (English)
K-Ar ages of a Pleistocene basalt from Eshima, Shimane Prefecture and a Miocene rhyolite from Awashima, Yumigahama Sandbar, Tottori Prefecture
File
language
jpn
Author
Sawada, Yoshihiro
Imai, Masahiro
Miura, Tamaki
Tokuoka, Takao
Itaya, Tetsumaru
Description
Igneous activity in the Shinji Rift System related to opening of the Japan Sea began in the Early Miocene and continued through to the Pleistocene. New K-Ar ages have been determined for a Pleistocene basalt from a borehole at Eshima bridge and a Miocene rhyolite from Awashima, southern Yumigahama Sandbar. The Pleistocene basalt yielded a whole rock K-Ar age of 0.19±0.01 Ma. A biotite age of 17.48±0.40 Ma for the Miocene rhyolite indicates that it belongs to the Kawai Formation. The Eshima borehole shows that the Eshima-Daikonjima basalts were erupted on land, and that their base is now situated 60 meters beneath present-day sea level. This suggests that sea level at 0.19±0.01 Ma was at least 60 meters lower relative to that of the present day.
Journal Title
島根大学地球資源環境学研究報告
Volume
25
Start Page
17
End Page
23
ISSN
13439774
Published Date
2006-12-27
NCID
AA11455176
Publisher
島根大学総合理工学部地球資源環境学教室
Publisher Aalternative
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Interdisciplinary Graduate School of Science and Engineering
Remark
12-14,16+ / 1993+
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