Variation and influencing factors of δ13C and δ18O in the inner and outer layers of modern Tridacna squamosa from the Xisha Islands, South China Sea

LIANG Chengde; HAN Tao; ZHAO Nanyu; WEN Hanfeng; WANG Guozhen; LIU Chengcheng; YANG Haotian; GENG Jun; YAN Hong

doi:10.16562/j.cnki.0256-1492.2024012501

Marine Geology & Quaternary Geology > 2024 > 44(4): 41-53. > DOI: 10.16562/j.cnki.0256-1492.2024012501

LIANG Chengde，HAN Tao，ZHAO Nanyu，et al. Variation and influencing factors of δ¹³C and δ¹⁸O in the inner and outer layers of modern Tridacna squamosa from the Xisha Islands, South China Sea[J]. Marine Geology & Quaternary Geology，2024，44(4)：41-53. DOI: 10.16562/j.cnki.0256-1492.2024012501

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Variation and influencing factors of δ¹³C and δ¹⁸O in the inner and outer layers of modern Tridacna squamosa from the Xisha Islands, South China Sea

LIANG Chengde^{1, 2,},
HAN Tao^1, ,,
ZHAO Nanyu¹,
WEN Hanfeng^{1, 2},
WANG Guozhen^{1, 2},
LIU Chengcheng^{1, 3},
YANG Haotian^{1, 4},
GENG Jun^{1, 2},
YAN Hong^1, ,

1.
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Xi'an Institute for Innovative Earth Environment Research, Xi'an 710061, China
4.
School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China

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Received Date: January 24, 2024
Revised Date: May 06, 2024
Accepted Date: May 05, 2024

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Abstract

Abstract

Tridacna shells, known for their distinct growth bands, serve as excellent proxies for recording tropical marine climate changes. The δ¹⁸O and δ¹³C in Tridacna shells have been applied in the Quaternary paleoclimate research. However, most previous researches focused on the inner layer, while the outer layer received less attention. We conducted a comprehensive analysis at a monthly resolution δ¹⁸O, δ¹³C tests on both the inner and outer layers, as well as daily growth band scans on the inner layer of modern Tridacna squamosa from the Xisha Islands in the South China Sea. Results reveal that the outer layer exhibited higher δ¹⁸O values than the inner layer. In addition, both shells displayed similar variation patterns, being primarily influenced by sea surface temperature (SST), and indicating that the δ¹⁸O of the outer layer could reliably indicate climate and environmental changes. In contrast, significant differences in δ¹³C value were observed between the inner and outer layers. The inner layer displayed a noticeable annual cycle in δ¹³C value. By comparing the inner layer δ¹³C, climatic and environmental parameters, and daily growth rate (DGR), we determined that the seasonal variations in inner layer δ¹³C were linked to the primary productivity and the life activities of Tridacna. Meanwhile, the δ¹³C of the outer layer, which is relatively negative compared to the inner layer, exhibited a continuous downward trend without seasonal changes. This discrepancy may be attributed to the sampling path deviating from the maximum growth axis.
- Tridacna,
- δ¹³C,
- δ¹⁸O,
- climate change,
- South China Sea

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References (70)

References

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Variation and influencing factors of δ¹³C and δ¹⁸O in the inner and outer layers of modern Tridacna squamosa from the Xisha Islands, South China Sea