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LONG-TERM CHANGES IN 14C AGE DIFFERENCES BETWEEN HUMIC ACID AND PLANT FRAGMENTS AND THEIR LINKS TO PAST CLIMATE CHANGE

Published online by Cambridge University Press:  03 December 2020

Youngeun Kim
Affiliation:
Geology Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, South Korea Department of Astronomy, Space Science and Geology, Chungnam National University, Daejeon, 34134, South Korea
Jaesoo Lim*
Affiliation:
Geology Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, South Korea
Jaehyung Yu
Affiliation:
Department of Geological Sciences, Chungnam National University, Daejeon, South Korea
Sujeong Park
Affiliation:
Geology Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, South Korea Department of Geological Sciences, Pusan National University, Busan, 34134, South Korea
Jin-Young Lee
Affiliation:
Geology Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, South Korea
Sei-Sun Hong
Affiliation:
Geology Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, South Korea
Gyujun Park
Affiliation:
Geochemical Analysis Center, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, South Korea
*
*Corresponding author. Email: limjs@kigam.re.kr.

Abstract

Radiocarbon (14C) dating has been widely used to determine the age of deposits, but there have been frequent reports of inconsistencies in age among different dating materials. In this study, we performed radiocarbon dating on a total of 33 samples from 8-m-long sediment cores recovered from the wetland of the Muljangori volcanic cone on Jeju Island, South Korea. Ten pairs of humic acid (HA) and plant fragments (PF) samples, and three pairs of HA and humin samples, from the same depths were compared in terms of age. The PF were consistently younger than the HA. Interestingly, the age difference between HA and PF samples showed a long-term change during the past 8000 years. To test whether there was an association between this long-term age difference and climate change, we compared with the carbon/nitrogen (C/N) ratios and total organic carbon isotope (δ13CTOC) values of the sediments, as indicators of the relative abundance of terrestrial and aquatic plants; these parameters showed similar long-term trends. This suggests that the increasing (decreasing) trend in age difference was influenced by long-term dry (wet) climate change.

Type
Research Article
Information
Radiocarbon , Volume 63 , Issue 1 , February 2021 , pp. 139 - 153
Copyright
© 2020 by the Arizona Board of Regents on behalf of the University of Arizona

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LONG-TERM CHANGES IN 14C AGE DIFFERENCES BETWEEN HUMIC ACID AND PLANT FRAGMENTS AND THEIR LINKS TO PAST CLIMATE CHANGE
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