AMS 14C DATING AND STABLE ISOTOPE ANALYSIS ON AN 8-KYR OYSTER SHELL FROM TAIPEI BASIN: SEA LEVEL AND SST CHANGES

IF 2 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Radiocarbon Pub Date : 2024-01-17 DOI:10.1017/rdc.2023.117
Hong-Chun Li, Horng-Sheng Mii, Tsung-Kwei Liu, Wen-Shan Chen, Su-Chen Kang, Chun-Yen Chou, Satabdi Misra, Tzu-Tsen Shen, Meixun Zhao
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引用次数: 0

Abstract

Seven accelerator mass spectrometry radiocarbon (AMS 14C) dates (7260±106∼7607±95 BP averaged 7444±103 BP) on a giant oyster shell, collected from an ancient shore of the Taipei Basin, are similar to the LSC (liquid scintillation counting) 14C age (7260±46 BP) of a grass sample inside the shell. The calibrated 14C ages of the C. gigas by Marine20 are 7490±240∼7805±230 cal BP (average 7660±96 cal BP), generally agreed with the calibrated LSC 14C ages of the grass and the oyster shell. Combined with other 14C ages of shoreline samples in the Taipei Basin, it is evident that sea level rose from 8600 to 7600 cal BP and reached a stand higher than modern sea level. During this marine transgression, the sedimentation rate along the shoreline was very high because 14C dating was not able to detect age differences for 4–5 m thick sediment sequences. Sixty-nine analyses of δ18O and δ13C from the oldest part of the shell exhibit clear seasonal cycles, with a 4-year period of growth in the 5.5-cm section. According to the δ18O values, the ancient oyster grew in a warmer-than-present shoreline environment, suggesting that the current absence of the giant oyster in Taiwan is not due to warming conditions.

对台北盆地 8 年生牡蛎贝壳的氨基比林 14c 测定和稳定同位素分析:海平面和地下水位的变化
在台北盆地古海岸采集的巨牡蛎壳上的 7 个加速器质谱放射性碳(AMS 14C)年代(7260±106∼7607±95 BP,平均 7444±103 BP)与壳内草样的 LSC(液体闪烁计数)14C 年代(7260±46 BP)相近。经 Marine20 标定的千头鳕 14C 年龄为 7490±240∼7805±230 卡 BP(平均 7660±96 卡 BP),与草样和牡蛎壳的 LSC 14C 年龄基本一致。结合台北盆地其他海岸线样本的 14C 年龄,可以看出海平面从公元前 8600 年上升到公元前 7600 年,并达到高于现代海平面的高度。由于 14C 测定法无法检测到 4-5 米厚的沉积序列的年龄差异,因此在这一海洋跃迁过程中,海岸线的沉积速率非常高。贝壳最古老部分的 69 项 δ18O 和 δ13C 分析显示出明显的季节性周期,5.5 厘米部分的生长期为 4 年。根据δ18O值,古牡蛎的生长环境比现在的海岸线环境温暖,这表明目前台湾没有巨牡蛎并不是因为气候变暖。
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来源期刊
Radiocarbon
Radiocarbon 地学-地球化学与地球物理
CiteScore
16.20
自引率
6.00%
发文量
85
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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