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  1. F300 宇宙地球環境研究所
  2. F300b 紀要
  3. 名古屋大学年代測定研究
  4. 4

ビーチロック試料の正確な膠結年代の決定方法 (2)

https://doi.org/10.18999/nagubc.4.9
https://doi.org/10.18999/nagubc.4.9
a5c303c6-bf17-45d7-96db-bba1f16016e7
名前 / ファイル ライセンス アクション
009-015_2019.pdf 009-015_2019.pdf (3.9 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2020-08-04
タイトル
タイトル ビーチロック試料の正確な膠結年代の決定方法 (2)
言語 ja
その他のタイトル
その他のタイトル An Attempt to Obtain Accurate Concretion Age of Beachrock Sample (2)
言語 en
著者 小元, 久仁夫

× 小元, 久仁夫

WEKO 100776

ja 小元, 久仁夫

Search repository
藁谷, 哲也

× 藁谷, 哲也

WEKO 100777

ja 藁谷, 哲也

Search repository
塩見, 昌司

× 塩見, 昌司

WEKO 100778

ja 塩見, 昌司

Search repository
大八木, 英夫

× 大八木, 英夫

WEKO 100779

ja 大八木, 英夫

Search repository
横尾, 頼子

× 横尾, 頼子

WEKO 100780

ja 横尾, 頼子

Search repository
池田, 晃子

× 池田, 晃子

WEKO 100781

ja 池田, 晃子

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Omoto, Kunio

× Omoto, Kunio

WEKO 100782

en Omoto, Kunio

Search repository
Waragai, Tetsuya

× Waragai, Tetsuya

WEKO 100783

en Waragai, Tetsuya

Search repository
Shiomi, Atsushi

× Shiomi, Atsushi

WEKO 100784

en Shiomi, Atsushi

Search repository
Oyagi, Hideo

× Oyagi, Hideo

WEKO 100785

en Oyagi, Hideo

Search repository
Yokoo, Yoriko

× Yokoo, Yoriko

WEKO 100786

en Yokoo, Yoriko

Search repository
Ikeda, Akiko

× Ikeda, Akiko

WEKO 100787

en Ikeda, Akiko

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
キーワード
主題Scheme Other
主題 conglomeratic beachrock
キーワード
主題Scheme Other
主題 AMS-14C dating
キーワード
主題Scheme Other
主題 pretreatment technique
キーワード
主題Scheme Other
主題 elemental analysis
抄録
内容記述 Formation age of beachrock has been determined based on 14C age of marine carbonate samples (i.e. fossil shell and coral) collected from beachrock, however the age often indicates the dead time and does not indicate correct formation age of beachrock. The formation age of beachrock is the time when the inter-tidal sediments were cemented by physicochemical precipitation of high-Mg calcite and aragonite from seawater or meteoric water as a result of high temperatures, CaCO3 supersaturation, and/or evaporation. Therefore it is necessary and indispensable to measure directly the beachrock cement (CaCO3). We collected 14C dating samples from the coast of Sasebo, Nagasaki prefecture, Zamami Island, Aka Island, Bise and Tsuha coasts of Okinawa prefecture. Aka Island and Zamami Island mainly consist of sandstone and phyllite. The cemented materials attached to the behind of boulders and cobbles consisting conglomeratic beachrock. This means that conglomeratic beachrock never originally include marine calcium carbonate. We used a small electric hand drill with a stainless steel drill edge of 2~3 mm or a stainless steel brush of 1cm in diameter, and drilled or abraded the surface of the cemented material. Then we collected ca. 20~50 mg powder sample for AMS-14C dating and elemental analysis by ICP-MS. Two cemented materials collected from Zamami Island yielded 14C ages of 1040 BP and 1020 BP, while Tridacna squamosa and a coral sample indicated 1600 BP and 1490 BP. Another cemented samples collected from Aka Island yielded 14C ages of 1530 BP and 1340 BP. Shell fragments and two coral samples yielded ages of 1210 BP, 1060 BP and 890 BP, respectively, however Strigatella paupercula sample indicated Modern (103 pMC). If we consider the age of cement material indicates exactly an accurate formation age of beachrock, then the conglomeratic beachrock of Zamami Island was formed during 1040~1020 BP and beachrock of Aka Island was formed 1530 BP and 1340 BP.
言語 en
内容記述タイプ Abstract
抄録
内容記述 ビーチロックの形成年代は,これまで生物化石の年代で決定されてきた。しかしその年代は生物の死亡年代を示すのみであり、ビーチロックの膠結年代を示すものではない。本研究では、ビーチロックの細粒物質間を膠結、または生物化石表面に付着しているセメント物質(炭酸カルシウム)を物理的・化学的に分離する手法を確立し、分離したセメント物質の年代をAMS-14C年代測定により決定する方法の開発を目的としている。本年度は、5地点のビーチロックから試料を採取して、AMS-14C年代測定を行い、沖縄県阿嘉島と座間味島の礫岩質ビーチロックの膠結年代を決定することができた。
言語 ja
内容記述タイプ Abstract
出版者
言語 ja
出版者 名古屋大学宇宙地球環境研究所
言語
言語 jpn
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
ID登録
ID登録 10.18999/nagubc.4.9
ID登録タイプ JaLC
書誌情報 ja : 名古屋大学年代測定研究

巻 4, p. 9-15, 発行日 2020-06
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