Abstract
Pulleniatina obliquiloculata shells from 16 core-top samples from the tropical Indo-Pacific Oceans are analyzed for the ratios of boron and cadmium to calcium (B/Ca and Cd/Ca). The B/Ca ratios show a very weak positive relationship with [B(OH)4-] and the dissolved carbonate species at the apparent calcification depth of P. obliquiloculata. The boron partition coefficients (KD) between P. obliquiloculata B/Ca and seawater [B(OH)4-]/[HCO3-] distribute around 1.1×10-3–1.3×10-3 with a mean value of (1.19±0.12)×10-3, and are significantly related to the nutrient concentration, especially phosphate. The lack of any clear correlation between the P. obliquiloculata B/Ca and seawater carbonate chemical parameters suggests that the physiochemical controls on boron incorporation are masked by the complexity of natural seawater condition. But the significant dependence of KD on nutrient may likely be explained by a nutrient related growth-rate effect. Cd/Ca of P. obliquiloculata shows significant correlation with seawater phosphate concentration, and its partition coefficients (DCd) are significantly related to temperature. A first-principle methodology of P. obliquiloculata B/Ca is applied, with the aid of Cd/Ca as a phosphate proxy and a constraint on KD, to estimating sea water carbonate chemistry (e.g., pH). The results are fairly promising and allow us to propose the possibility to apply the combination of B/Ca and Cd/Ca proxies (and also Mg/Ca and δ18O for estimating temperature and salinity) for the paleoreconstruction of seawater carbonate chemistry.
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Acknowledgements
This work is supported by the Fundamental Research Funds for the Central Universities and implemented under the France-China Framework of LIA-MONOCL. We gratefully acknowledge the support of K. C. Wong Education Foundation. This manuscript was firstly composed onboard “JOIDES Resolution” during the transit across Indonesian Waters of IODP Expedition 363.
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Foundation item: The National Natural Science Foundation of China (NSFC) and NSFC-Shandong Joint Fund for Marine Science Research Centers under contract Nos 41606049, U1606401 and 41376054; the China Postdoctoral Science Foundation under contract No. 2015M581658.
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Dang, H., Wang, T., Qiao, P. et al. The B/Ca and Cd/Ca of a subsurface-dwelling foraminifera Pulleniatina obliquiloculata in the tropical Indo-Pacific Ocean: implications for the subsurface carbonate chemistry estimation. Acta Oceanol. Sin. 38, 138–150 (2019). https://doi.org/10.1007/s13131-019-1406-6
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DOI: https://doi.org/10.1007/s13131-019-1406-6