首次直接测定楚科奇东部梅奇门和拉夫连季亚海湾海岸块冰的放射性碳年代（22-27 cal ka bp

IF 2 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Radiocarbon Pub Date : 2024-03-26 DOI:10.1017/rdc.2024.21

Yurij K Vasil’chuk, Nadine A Budantseva, Alexey A Maslakov, Alla C Vasil’chuk, Jessica Yu Vasil’chuk

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引用次数: 0

摘要

东楚科奇被认为是一个独特的永久冻土地区，在这里广泛分布着巨大的冰体。然而，人们经常讨论这些冰层的起源和年龄。利用 AMS 14C 测定法首次确定了楚科奇大冰块的年龄。研究发现，梅奇门湾沿岸的三个巨型冰体形成于晚更新世末期：a）阿卡尼遗址附近，公元前 21612 至 22147 年；b）拉夫连季亚定居点附近，公元前 27553 年；c）拉夫连季亚定居点附近，公元前 22193 年。所研究的块冰中的稳定同位素值变化范围相当大，δ18O 值的变化范围约为 10‰（从-14.8‰到-24.5‰），δ2H 值的变化范围约为 75‰（从-116‰到-191‰）。所研究的块状冰体属于内生成因，是在 MIS2 的最后阶段（22-27 cal ka BP）形成的。

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FIRST DIRECT RADIOCARBON DATING (22–27 CAL KA BP) OF MASSIVE ICE AT THE MECHIGMEN AND LAVRENTIYA BAYS COAST, EASTERN CHUKOTKA

The Eastern Chukotka is considered a unique permafrost region where massive ice bodies are widespread. However, the origin and age of these ice formations are often discussed. The age of the massive ice of Chukotka was established for the first time using AMS 14C dating. It was revealed that three massive ice bodies on the coast of Mechigmen Bay were formed at the end of the Late Pleistocene: a) near the Akkani site, 21,612 to 22,147 cal BP; b) near the Lavrentiya settlement, 27,553 cal BP; and c) near the Lavrentiya settlement, 22,193 cal BP. Stable isotope values in the studied massive ice vary in a rather wide range by about 10‰ for δ18O values (from –14.8‰ to –24.5‰) and about 75‰ for the δ2H values (from –116‰ to –191‰). The studied massive ice bodies are of intrasedimental genesis and formed epigenetically during the final stage of MIS2 (22–27 cal ka BP).

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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.