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On Some Pebbles collected from the Floor of the Japan Sea
https://doi.org/10.15083/0000034875
https://doi.org/10.15083/000003487543df3c5a-7aab-4462-aed9-902327862f91
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
ji0104006.pdf (1.3 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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| 公開日 | 2017-02-07 | |||||
| タイトル | ||||||
| タイトル | On Some Pebbles collected from the Floor of the Japan Sea | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||
| タイプ | departmental bulletin paper | |||||
| ID登録 | ||||||
| ID登録 | 10.15083/0000034875 | |||||
| ID登録タイプ | JaLC | |||||
| その他のタイトル | ||||||
| その他のタイトル | 日本海海底より採集せられたる礫に就いて | |||||
| 著者 |
Tsuya, Hiromichi
× Tsuya, Hiromichi |
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| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 84380 | |||||
| 姓名 | 津屋, 浩逵 | |||||
| 著者所属 | ||||||
| 著者所属 | 地震研究所 | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Many pebbles of igneous rocks, both plutonic and effusive, and of sedimentary rocks were collected from a submarine ridge known as the Yamato Bank in the Japan Sea. They are round or subangular with well polished surface, and vary in size from sand-grade to gravel over 50cm. in diameter. If these pebbles had been found only in a limitted area lying 011 the track of steamships, their presence might be attributed to ballast thrown overboard from passing vessels. But the distribution of the pebbles is evidence of its improbability. Neither is it likely that ocean currents transport pebbles of this size so far from the present shores. On the other hand, there can be no wearing down of the surface of hard rocks on the sea-floor with a depth of 500-600 in. The only alternative is that the sea-floor that yielded these pebbles was at one time either a land-surface or a shallow sea near the shore, when they were formed by erosive action of the water flowing over their respective parent rock-masses, t'le shores submerging later to their present depths. All the pebbles described in this paper have the general petrographic characters common to their respective rock-types now exposed in the Japanese Islands. Hence it is inferred that the pebbles are derived from land which is now below the sea and which is geologically connected with the Japanese Islands, or that it was transported from some part of the present Japanese Islands before its submergence to where they lie on the sea-floor at present. The granite pebbles does riot show characteristics that could be correlated with any Japanese granite whose geological age has been established ; while the andesite arid basalt pebbles have characteristics common to the late-Tertiary and Quaternary volcariics in the Japanese Islands. It is therefore highly probable that the sea-floor where these pebbles exist was a land-surface or a very shallow sea near the shore during the post-Neogene. If the latest land-submergence had occurred in a very remote geological past, the pebbles could riot have remained for long, geologically speaking, in the condition in which they are found at present without the aid of some auxiliary agent such as earthquake disturbances at the sea-bottom, since a sea-floor with a depth of 500-average along its outer margin, and the lower one, which is far less incomplete in form than the other, extends down to 720m. These two are regarded by him as the prolongations respectively of the T arid PN terraces on the present land-surface of the Japanese Islands. Thus, the present discovery of the pebbles and the inferences drawn from a petrographic study made of them may be strong evidences in support of Dr. Yabe's views concerning the epeirogenetic or eustatic movement of the Japanese Islands in recent geologic times, regardless of the cause, the magnitude, or the mechanism of the movement. Further studies of these pebbles may supply data that will afford more weighty evidence in favor of some particular age-span for the latest land-stage of the seas now bordering the present Japanese Islands. In conclusion the writer desires to express his sincere thanks to Lieutenant-Commander Asahina, who supplied him with a piece of the granite pebble, and also to Mr jSTiirio, through whose kindness the writer obtained many pebbles from the collection of the Imperial Fisheries Experimental Station of Tokyo. | |||||
| 書誌情報 |
東京帝國大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, Tokyo Imperial University 巻 10, 号 4, p. 864-875, 発行日 1932-12-22 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 00408972 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN00029699 | |||||
| 日本十進分類法 | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 453 | |||||
| 出版者 | ||||||
| 出版者 | 東京帝国大学地震研究所 | |||||
| 出版者別名 | ||||||
| Earthquake Research Institute, Tokyo Imperial University | ||||||
