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Middle Albian climate fluctuation recorded in the carbon isotope composition of terrestrial plant matter
Journal of Asian Earth Sciences ( IF 3.059 ) Pub Date : 2020-04-10 , DOI: 10.1016/j.jseaes.2020.104363
Sung Kyung Hong; Sangheon Yi; Young Jae Shinn

This study presents the carbon isotopic record for terrestrial plant matter (δ13CTPM) in the Jinju Formation, Gyeongsang Basin, Korea, during the middle Albian. The measured δ13CTPM provides continuous high-resolution temporal variations for reconstructing climate change during the middle Albian, which has previously been poorly understood. We found that the δ13CTPM variation mostly exceeds the isotopic variation of the contemporaneous atmospheric CO2, indicating that the variation was primarily governed by climate change rather than atmospheric source. The δ13CTPM values corrected to modern atmospheric CO2 show cyclic fluctuations (−27.8‰ to −23.3‰), reflecting a temporal variation of water availability and/or a related taxonomic turnover of plant communities in the hinterland of Jinju Lake. Based on a transfer function for estimating mean annual rainfall (MAR) from the measured δ13CTPM values, the middle Albian climate of the basin was found to vary from sub-humid to humid conditions (MAR: 500–1500 mm). This variability suggests that Albian climate change at middle latitudes occurred more frequently than previously interpreted. The temporal increase in aridity observed in the basin (35–38°N) has not been detected in the isotopic records of the Cretaceous Hokkaido section (42–45°N) in Japan. This difference implies the possibility of a periodic northward shift or expansion of the northern hemisphere subtropical high pressure belt.
更新日期:2020-04-21

 

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