Characteristics of organic carbon isotope and the paleoenvironmental significances of loess in Shengshan Island during the Last Glacial Period

ZHAO Qing; ZHOU Limin; ZHENG Xiangmin; WANG Hui; LV Honghua; CHEN Yuanyuan

doi:10.16562/j.cnki.0256-1492.2022061403

2023 Vol. 43, No. 1

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Article navigation > Marine Geology & Quaternary Geology > 2023 > 43(1): 159-169

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ZHAO Qing, ZHOU Limin, ZHENG Xiangmin, WANG Hui, LV Honghua, CHEN Yuanyuan. Characteristics of organic carbon isotope and the paleoenvironmental significances of loess in Shengshan Island during the Last Glacial Period[J]. Marine Geology & Quaternary Geology, 2023, 43(1): 159-169. doi: 10.16562/j.cnki.0256-1492.2022061403

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ZHAO Qing, ZHOU Limin, ZHENG Xiangmin, WANG Hui, LV Honghua, CHEN Yuanyuan. Characteristics of organic carbon isotope and the paleoenvironmental significances of loess in Shengshan Island during the Last Glacial Period[J]. Marine Geology & Quaternary Geology, 2023, 43(1): 159-169. doi: 10.16562/j.cnki.0256-1492.2022061403

Characteristics of organic carbon isotope and the paleoenvironmental significances of loess in Shengshan Island during the Last Glacial Period

Key Laboratory of Geographic Information Science of Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai 200241, China

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Corresponding author: ZHOU Limin, lmzhou@geo.ecnu.edu.cn

Received Date: 14 June 2022

Revised Date: 31 August 2022

Accepted Date: 31 August 2022

Publish Date: 28 February 2023

Abstract

Abstract

The organic carbon isotope composition in loess deposits is closely related to paleoclimate, which is of great significance to the study of regional environmental evolution. The loess deposit of the Last Glacial Period in Shengshan Island in the East China Sea off the East China was studied. The magnetic susceptibility and element geochemistry were analyzed, based on which the organic carbon isotope composition was scrutinized. Results show that since the Last Glaciation, the organic carbon isotope composition in the loess fluctuated from −21.63‰ to −27.56‰ on average of −24.88‰. In general, the value of organic carbon isotope decreased with the increase in burial depth of the loess. In addition, the relative abundance of C₃/C₄ vegetation in Shengshan Island was estimated by using the end-member method. It was revealed that the C₃ plants dominated in the island since the Last Glacial Period, and C₄ plants were very limited in the contribution to the organic carbon isotope in the loess deposit. In comparison with the oxygen isotope data of the cave stalagmites in Nanjing, marine sediments from Sulu Sea, and Antarctic Vostok ice core, the loess was deposited during the interstage of the Last Glaciation, and the fluctuation in organic carbon isotope value was resulted mainly from the responses of local ancient C₃ plant-dominated vegetation to the variation of precipitation condition. The precipitation was the main influential factor on the organic carbon isotope variation during the period. In the last deglaciation stage, the paleo-temperature favored C₄ plants booming, thus the relative abundance of C₄ plants increased, and so did their contribution to the fluctuation of organic carbon isotopes in the loess deposits in the island.
- organic carbon isotope composition /
- Last Glaciation /
- precipitation /
- temperature /
- Shengshan Island loess

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References

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