Quantitative study on the cave environmental factors for the fractionation of stable oxygen isotopes during the deposition of speleothem
The speleothem δ18O record is an important archive for reconstructing paleoclimate changes. However, the complex interaction between environmental factors and kinetic fractionation processes poses challenges in interpreting paleoclimatic information from δ18O records in speleothems. Cave monitoring...
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| Hauptverfasser: | , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
15 April 2026
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| In: |
Palaeogeography, palaeoclimatology, palaeoecology
Year: 2026, Jahrgang: 688, Pages: 1-14 |
| ISSN: | 1872-616X |
| DOI: | 10.1016/j.palaeo.2026.113616 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1016/j.palaeo.2026.113616 Verlag, kostenfrei, Volltext: https://www.sciencedirect.com/science/article/pii/S0031018226000799 
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| Verfasserangaben: | Yue Jin, Chun-Jie Wang, Jian Zhang, Wen-Jun Sun, Chao-Jun Chen, Yao Wu, Hua-Yan Li, Yue-Hua Xiang, Yue-Yuan Lin, Xin-Rui Ye, Xin-Yan Li, Zhong-Lin Deng, Min Zhao, Li-Juan Sha, Ting-Yong Li, Jun-Yun Li |
| Zusammenfassung: | The speleothem δ18O record is an important archive for reconstructing paleoclimate changes. However, the complex interaction between environmental factors and kinetic fractionation processes poses challenges in interpreting paleoclimatic information from δ18O records in speleothems. Cave monitoring has been conducted during 2014-2023 in Furong Cave, southwest China, including the δ18O values and drip intervals of drip water, cave air temperature, partial pressure of carbon dioxide (pCO2), and relative humidity (RH). The monitoring data are combined with the ISOLUTION model to explore the main controlling factors on δ18O during the process of calcite deposition. The results show that when the drip interval increases from 0 to 500 s, the δ18O values of speleothem increase rapidly by approximately 0.4‰. Based on the rigorous quantitative analysis, cave air temperature is established as one of the primary controlling factors on the δ18O values. The slope of the linear relationship between cave air temperature and the δ18O values of speleothem is −0.21‰/°C. However, the effects of cave pCO2 and RH on the δ18O values of speleothem can be ignored in the cave systems with poor ventilation conditions. Based on this study, the influences of temperature sensitivity coefficients and drip interval thresholds on the stable oxygen isotope fractionation during the speleothem deposition which will assist in quantitative reconstruction of past temperature and precipitation from speleothem δ18O records. |
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| Beschreibung: | Gesehen am 24.06.2026 |
| Beschreibung: | Online Resource |
| ISSN: | 1872-616X |
| DOI: | 10.1016/j.palaeo.2026.113616 |