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首页> 外文期刊>Radiocarbon >Radiocarbon Ages and Isotope Fractionations of Beachrock Samples Collected from the Nansei Islands, Southwestern Japan
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Radiocarbon Ages and Isotope Fractionations of Beachrock Samples Collected from the Nansei Islands, Southwestern Japan

机译：从日本西南部南塞群岛收集的滩涂样品的放射性碳年龄和同位素分数

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摘要

A total of 294 beachrock samples were collected from 116 sites on 15 islands in the Nansei Islands chain, southwestern Japan, and were radiocarbon dated. The beachrocks began to form at about 6900 BP and some are still under development in the islands. Values of isotope fractionations of different materials making up the beachrocks ranged between +9.4 per thousand and -5.7 per thousand. Isotope fractionations outside the range of 0 + - 2 per thousand suggest that these beachrocks were strongly influenced by underground water and running freshwater when they were cemented. The sea level during the late Holocene has remained the same for at least the past 5000 yr, except for several uplifted coasts.
机译：从日本西南部南塞群岛链上15个岛屿的116个地点收集了总共294个滩石样品，并标明了放射性碳年代。滩岩在大约6900 BP时开始形成，其中一些仍在开发中。构成滩涂的不同物质的同位素分馏值介于+ 9.4 /千和-5.7 /千之间。同位素分馏范围超出千分之0 +-2时，表明这些海滩岩在固井时受到地下水和淡水的强烈影响。至少在过去的5000年中，全新世晚期的海平面一直保持不变，除了几个隆起的海岸。

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