韩国济州岛第四纪锆石的激光烧蚀MC-ICPMS U-Th和U-Th-Pb年代测定

IF 2.5 4区 化学 Q3 CHEMISTRY, ANALYTICAL
Youn-Joong Jeong, Min-Ji Jung, Ung-San Ahn, Albert Chang-sik Cheong
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引用次数: 0

摘要

激光烧蚀电感耦合等离子体质谱仪(LA-ICPMS)出现于 20 世纪 80 年代中期,并迅速成为一种重要的测年工具。飞秒 LA 系统的出现大大减少了与挥发性有关的质量分馏。本研究利用先进的飞秒激光连接多收集器(MC)-ICPMS,展示了从韩国济州岛采集的第四纪锆石的U-Th和U-Th-Pb定年结果。来自白石潭湖(JJ616-1)、灵石(JJ08-1)、春王寺(JJ09-1)和大雷洞(JJ09-3)附近砂岩样本的锆石颗粒提供了加权平均 238U-230Th 年龄为 28.7 ± 1.6 ka (n = 56/64, MSWD = 3.8)、81.8 ± 10.9 ka (n = 11/12, MSWD = 1.6)、92.6 ± 4.6 ka (n = 49/51, MSWD = 2.2) 和 117.6 ± 8.2 ka (n = 48/50, MSWD = 3.2)。JJ08-1锆石的年龄测定结果与推荐值(82 ± 6 ka)非常吻合。Sanbangsan(JJ615-1)和Wonmansa(JJ08-2)砂岩的锆石得出了共同的铅和放射性不平衡校正加权平均238U-206Pb年龄,分别为785 ± 5 ka(n = 27/28,MSWD = 0.90)和743 ± 8 ka(n = 28/30,MSWD = 0.79)。蓬莱和 61.308 参考锆石的 238U-206Pb 加权平均年龄分别为 4226 ± 21 ka (n = 22/25, MSWD = 3.8) 和 2488 ± 20 ka (n = 19/20, MSWD = 1.8)。这些年龄与推荐值一致。我们的数据为济州岛在早更新世、中更新世和晚更新世之间的过渡时期发生的岩浆岩化提供了更多证据。本研究中分析的锆石样本可作为第四纪地质年代研究的参考年代数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Laser ablation MC-ICPMS U-Th and U-Th-Pb dating of Quaternary zircons from Jeju Island, Korea
Laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) emerged in the mid-1980s and rapidly became a crucial dating tool. The advent of femtosecond LA systems has substantially reduced volatility-dependent mass fractionation. This study showcases U-Th and U-Th-Pb dating results of Quaternary zircons collected from Jeju Island, Korea, utilizing an advanced femtosecond laser-connected multi-collector (MC)-ICPMS. Zircon grains from trachyte samples near the Baeknokdam lake (JJ616-1), Yeongsil (JJ08-1), Chunwangsa (JJ09-1), and Oraidong (JJ09-3) provided weighted mean 238U-230Th ages of 28.7 ± 1.6 ka (n = 56/64, MSWD = 3.8), 81.8 ± 10.9 ka (n = 11/12, MSWD = 1.6), 92.6 ± 4.6 ka (n = 49/51, MSWD = 2.2), and 117.6 ± 8.2 ka (n = 48/50, MSWD = 3.2), respectively. The age determination for JJ08-1 zircon aligned well with the recommended value (82 ± 6 ka). Zircons from Sanbangsan (JJ615-1) and Wonmansa (JJ08-2) trachytes yielded common Pb and radioactive disequilibrium-corrected weighted mean 238U-206Pb ages of 785 ± 5 ka (n = 27/28, MSWD = 0.90) and 743 ± 8 ka (n = 28/30, MSWD = 0.79), respectively. The weighted mean 238U-206Pb ages of Penglai and 61.308 reference zircons were determined to be 4226 ± 21 ka (n = 22/25, MSWD = 3.8) and 2488 ± 20 ka (n = 19/20, MSWD = 1.8), respectively. These ages are concordant with the recommended values. Our data provides additional evidence of trachyte magmatism occurring in Jeju Island during the transitional period between the Early and Middle Pleistocene and the Late Pleistocene. The zircon samples analyzed in this study could serve as reference age data for Quaternary geochronology research.
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来源期刊
Journal of Analytical Science and Technology
Journal of Analytical Science and Technology Environmental Science-General Environmental Science
CiteScore
4.00
自引率
4.20%
发文量
39
审稿时长
13 weeks
期刊介绍: The Journal of Analytical Science and Technology (JAST) is a fully open access peer-reviewed scientific journal published under the brand SpringerOpen. JAST was launched by Korea Basic Science Institute in 2010. JAST publishes original research and review articles on all aspects of analytical principles, techniques, methods, procedures, and equipment. JAST’s vision is to be an internationally influential and widely read analytical science journal. Our mission is to inform and stimulate researchers to make significant professional achievements in science. We aim to provide scientists, researchers, and students worldwide with unlimited access to the latest advances of the analytical sciences.
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