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AMS 14C DATING AND STABLE ISOTOPE ANALYSIS ON AN 8-KYR OYSTER SHELL FROM TAIPEI BASIN: SEA LEVEL AND SST CHANGES
Radiocarbon ( IF 8.3 ) 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
Radiocarbon ( IF 8.3 ) 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
Seven accelerator mass spectrometry radiocarbon (AMS 14 C) 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) 14 C age (7260±46 BP) of a grass sample inside the shell. The calibrated 14 C 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 14 C ages of the grass and the oyster shell. Combined with other 14 C 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 14 C dating was not able to detect age differences for 4–5 m thick sediment sequences. Sixty-nine analyses of δ18 O and δ13 C 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 δ18 O 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.
更新日期:2024-01-17