{"_buckets": {"deposit": "3d159dd4-96eb-46dd-bedf-5697e87c4651"}, "_deposit": {"id": "30348", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "30348"}, "status": "published"}, "_oai": {"id": "oai:nagoya.repo.nii.ac.jp:00030348"}, "item_9_alternative_title_19": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u8a00\u8a9e\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "An Attempt to Obtain Accurate Concretion Age of Beachrock Sample (2)"}]}, "item_9_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2020-06", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "15", "bibliographicPageStart": "9", "bibliographicVolumeNumber": "4", "bibliographic_titles": [{"bibliographic_title": "\u540d\u53e4\u5c4b\u5927\u5b66\u5e74\u4ee3\u6e2c\u5b9a\u7814\u7a76"}]}]}, "item_9_description_4": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "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\uff5e3 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\uff5e50 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\uff5e1020 BP and beachrock of Aka Island was formed 1530 BP and 1340 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