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As the results of dating, autochthonous limestone bodies on both islands were assigned to the last interglacial. The height of \"raised surf bench\" relating to the dated limestone was ca. 10 m and 12.2-12.7 m on Kita- and Minami-Daito Islands, respectively. From these facts, both islands are considered to have been uplifted very slowly, at the rate of approximately 0.05 m/ka, since the last interglacial.\n(3) The Riukiu Limestone on northwestern part of Yonaguni Island consists of three reef complexes formed during three interglacials, 120-140 ka BP, 200-230 ka BP and ca. 300 ka BP. The height of marine terrace reminds us that this island have been uplifted at the rate of 0.1-0.2 m/ka during the last 130 ka.\n(4) Ahermatypic simple corals of six species were collected for age determination from the Tsukui Formation in the southeastern part of Miura Peninsula, Kanagawa Prefecture. ^\u003c230\u003eTh/^\u003c234\u003eU ages of three species are corresponding to the oxygen isotope stage 9.\n(5) In order to make sure the eruption age of the Rotoehu Ash, one of wide distributed tephra of New Zealand, ^\u003c230\u003eTh-^\u003c238\u003eU method was applied and obtained the date of 71,000\u003cplus-minus\u003e6,000 years. 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ウラン系列核種間の放射非平衡系を利用した地質年代測定に関する研究
https://doi.org/10.24517/00057076
https://doi.org/10.24517/00057076a79de530-eabd-4d1a-9040-a84f85468113
名前 / ファイル | ライセンス | アクション |
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SC-PR-OMURA-A-kaken 1993-2p.pdf (110.7 kB)
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Item type | 報告書 / Research Paper(1) | |||||
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公開日 | 2022-05-23 | |||||
タイトル | ||||||
タイトル | ウラン系列核種間の放射非平衡系を利用した地質年代測定に関する研究 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Geochronological Study by Use of the Radiochemical Disequilibrium between Nuclides in the Uranium Decay Series | |||||
言語 | ||||||
言語 | jpn | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_18ws | |||||
資源タイプ | research report | |||||
ID登録 | ||||||
ID登録 | 10.24517/00057076 | |||||
ID登録タイプ | JaLC | |||||
著者別表示 |
Omura, Akio
× Omura, Akio |
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提供者所属 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 金沢大学自然科学研究科 | |||||
書誌情報 |
平成1(1989)年度 科学研究費補助金 一般研究(B) 研究成果報告書概要 en : 1989 Fiscal Year Final Research Report Summary 巻 1987-1989, p. 2p., 発行日 1993-03-15 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | 半減期が75,000年のα放射体である^<230>Thの成長率や減衰龍に基づく年代測定法について、適用試料の種類を増やし、より一層信頼できる年代値を得ることを心がけながら、本研究では、以下に箇条書きする成果を得た。1.天然試料に含まれる微量のウランおよびトリウム同位体をαスペクトル法で定量するための測定システムを改良する一方、試料から上記同位体を抽出・分離・精製するための迅速で簡便な方法を開発した。 2.沖縄県南北両大東島における詳細な地質および地形調査によって、合計9地点で更新統石灰岩体の存在を確認し、合計90個の年代測定可能な未変質のサンゴ化石試料を採集した。それらの内46試料から計50の放射年代を求めたところ、両島上の更新統は、すべてが約13万年前の"最終間氷期"とそれ以降に形成されたこと、そして、当時の海面高度を指示する離水サ-フベンチの現在の海抜高度から、両島が過去13万年間に数m(北大東島が少なくとも4.0m、南大東島が6.7m)隆起したと推定した。 3.同県与那国島北西部の琉球石灰岩についても、同様の手法で詳細に検討したところ、島の北部海岸一帯に発達する最高高度約25mまでの平坦面を成す海成段丘が、約13万年前・約21万年前・約30万年前の3回の間氷期に形成された礁複合体石灰岩で構成される"多重平坦(段丘面)"であることが判明した。 4.神奈川県三浦半島に分布する津久井層産非礁性単体サンゴから、酸素同位体ステ-ジ9相当(約30万年前)の年代値を得たが、このことによって、三浦半島と房総半島の更新統が正確に対比できることになった。 5.ニュ-ジ-ランド上部更新統中の鍵層として極めて重要なRotoehu火山灰が71,000±6,000年前に噴出したことを明らかにし、同国第四系の研究にテフロクロノロジ-が有効であることを実証した。 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Results newly obtained during the term of this study are summarized as follows: (1) A simple and effective technique to separate uranium and thorium isotopes from geologic materials such as silicates and carbonates was developed for the ^<230>Th method of dating. (2) The distribution of Pleistocene limestone was confirmed at nine locations and the total number of ninety of coral samples were collected for dating by the ^<230>Th/^<234>U method from Kita- and Minami-Daito Islands. As the results of dating, autochthonous limestone bodies on both islands were assigned to the last interglacial. The height of "raised surf bench" relating to the dated limestone was ca. 10 m and 12.2-12.7 m on Kita- and Minami-Daito Islands, respectively. From these facts, both islands are considered to have been uplifted very slowly, at the rate of approximately 0.05 m/ka, since the last interglacial. (3) The Riukiu Limestone on northwestern part of Yonaguni Island consists of three reef complexes formed during three interglacials, 120-140 ka BP, 200-230 ka BP and ca. 300 ka BP. The height of marine terrace reminds us that this island have been uplifted at the rate of 0.1-0.2 m/ka during the last 130 ka. (4) Ahermatypic simple corals of six species were collected for age determination from the Tsukui Formation in the southeastern part of Miura Peninsula, Kanagawa Prefecture. ^<230>Th/^<234>U ages of three species are corresponding to the oxygen isotope stage 9. (5) In order to make sure the eruption age of the Rotoehu Ash, one of wide distributed tephra of New Zealand, ^<230>Th-^<238>U method was applied and obtained the date of 71,000<plus-minus>6,000 years. From this results, marine sediments of Te Papa Terrace in the Bay of Plenty, North Island, is concluded to have been deposited during a global high sea stand at ca. 85 ka. |
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内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 研究課題/領域番号:62470047, 研究期間(年度):1987-1989 | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 出典:研究課題「ウラン系列核種間の放射非平衡系を利用した地質年代測定に関する研究」課題番号62470047 (KAKEN:科学研究費助成事業データベース(国立情報学研究所)) (https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-62470047/624700471989kenkyu_seika_hokoku_gaiyo/)を加工して作成 |
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著者版フラグ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
関連URI | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://kaken.nii.ac.jp/search/?qm=70019488 | |||||
関連名称 | https://kaken.nii.ac.jp/search/?qm=70019488 | |||||
関連URI | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62470047/ | |||||
関連名称 | https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62470047/ | |||||
関連URI | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-62470047/624700471989kenkyu_seika_hokoku_gaiyo/ | |||||
関連名称 | https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-62470047/624700471989kenkyu_seika_hokoku_gaiyo/ |