| 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
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| Title Alternative (English) | K-Ar ages of a Pleistocene basalt from Eshima, Shimane Prefecture and a Miocene rhyolite from Awashima, Yumigahama Sandbar, Tottori Prefecture
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| File | |
| language |
jpn
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| Author |
Sawada, Yoshihiro
Imai, Masahiro
Miura, Tamaki
Tokuoka, Takao
Itaya, Tetsumaru
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| 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.
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| Journal Title |
島根大学地球資源環境学研究報告
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| Volume | 25
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| Start Page | 17
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| End Page | 23
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| ISSN | 13439774
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| Published Date | 2006-12-27
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| NCID | AA11455176
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| DOI（SelfDOI） | |
| Publisher | 島根大学総合理工学部地球資源環境学教室
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| Publisher Aalternative | Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
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| NII Type |
Departmental Bulletin Paper
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| Format |
PDF
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| Text Version |
出版社版
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| OAI-PMH Set |
Interdisciplinary Graduate School of Science and Engineering
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| Remark | 12-14,16+ / 1993+
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| 他の一覧 |
