| Citation: |
ZHOU Xiaoli，YANG Chunyu. Core-top calibration of element ratios in modern benthic foraminifera Uvigerina spp. for paleotemperature reconstruction[J]. Marine Geology & Quaternary Geology，2025，45(4)：1-13. DOI: 10.16562/j.cnki.0256-1492.2025040703
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The Mg/Ca ratio of benthic foraminifera Uvigerina spp. is commonly used for reconstruction of bottom water temperature (BWT). However, BWT reconstructions may be influenced by non-thermal factors such as carbonate chemistry, and the effect of interspecies difference within Uvigerina spp. remain debated. To further assess the reliability of foraminiferal elemental proxies, we use multiple elemental ratios (Mg/Ca, Li/Ca, Mg/Li, B/Ca, and Sr/Ca) of three species of Uvigerina (U. proboscidea, U. peregrina, and U. elongatastriata) from core-top sediments collected during the BJ8-03 cruise in Sulawesi, Indonesia to compare interspecies difference in BWT and carbonate chemistry proxies. By compiling published elemental data of Uvigerina from various sites in the global ocean, we re-examined the interspecies difference and BWT reconstruction methods. Results show that the main factor affecting the BWT proxies of Uvigerina was due to interspecies difference, not the cleaning method. By multi-proxy comparison, we found that Mg/Ca in U. proboscidea correlated well with BWT, and Sr/Ca in both U. proboscidea and U. peregrina correlated with Δ[CO32−]. In contrast, data of U. elongatastriata are scattered and showed no significant correlation with environmental parameters. Furthermore, we updated the Mg/Ca-BWT equation for U. peregrina (Mg/Ca=0.94(±0.059)+0.06(±0.007)×BWT) using compiled data from global sites. The sensitivity of Mg/Ca to BWT (6%) is similar to previous results, suggesting that the Mg/Ca proxy is robust. However, the sensitivity of Mg/Li to BWT differed from previous results, suggesting that the validity of this proxy requires further investigation. Li/Ca, B/Ca, and Sr/Ca showed no robust correlations with BWT and carbonate chemistry, and their potential of indicating seawater environmental parameters needs further evaluation.
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