RADIOCARBON AND URANIUM PROFILES IN MARINE GASTROPODS AROUND THE JAPANESE ARCHIPELAGO

IF 2 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Radiocarbon Pub Date : 2024-02-06 DOI:10.1017/rdc.2023.122

Shoko Hirabayashi, Takahiro Aze, Yosuke Miyairi, Hironobu Kan, Yusuke Yokoyama

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Abstract

In this study, we investigate the distribution of radiocarbon and uranium in the calcified opercula of Turbo sp. collected from Ryukyu region and Chiba, Japan, to explore the potential of U/Th dating using mollusks collected from the Japanese archipelago. We acquired high-resolution radiocarbon and uranium concentration measurements using single-stage accelerator mass spectrometry and laser ablation−inductively coupled plasma−mass spectrometry. Our results show that uranium in the opercula of modern Turbo sp. is unevenly distributed at concentrations 1000 times less than those in coral skeletons. Radiocarbon found in the calcified opercula samples record ambient seawater radiocarbon values as well as coral skeletons. Uranium in the calcified opercula of Holocene Turbo marmoratus were also unevenly distributed and concentrated within the opercula in a different manner than observed in modern samples, suggesting uranium exchange after death. Our results suggest variable uptake of uranium isotopes into mollusk shells and highlights the need for rigorous sample selection criteria when choosing mollusks species for U/Th dating around Japan.

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日本列岛周围海洋腹足类动物的放射性碳和铀剖面图

在这项研究中，我们调查了从日本琉球地区和千叶县采集的 Turbo sp.钙化厣中放射性碳和铀的分布情况，以探索利用从日本列岛采集的软体动物进行 U/Th 测定的潜力。我们使用单级加速器质谱法和激光烧蚀-电感耦合等离子体质谱法获得了高分辨率的放射性碳和铀浓度测量结果。结果表明，现代 Turbo sp.厣中的铀分布不均，其浓度比珊瑚骨骼中的浓度低 1000 倍。在钙化厣样本中发现的放射性碳与珊瑚骨骼一样，都记录了周围海水的放射性碳值。全新世 Turbo marmoratus 的钙化厣中铀的分布也不均匀，而且集中在厣内的方式与在现代样本中观察到的不同，这表明死后进行了铀交换。我们的研究结果表明，软体动物贝壳对铀同位素的吸收是可变的，并强调了在日本各地选择软体动物物种进行 U/Th 测定时需要严格的样本选择标准。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Radiocarbon 地学-地球化学与地球物理

CiteScore

16.20

自引率

6.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Radiocarbon serves as the leading international journal for technical and interpretive articles, date lists, and advancements in 14C and other radioisotopes relevant to archaeological, geophysical, oceanographic, and related dating methods. Established in 1959, it has published numerous seminal works and hosts the triennial International Radiocarbon Conference proceedings. The journal also features occasional special issues. Submissions encompass regular articles such as research reports, technical descriptions, and date lists, along with comments, letters to the editor, book reviews, and laboratory lists.

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