Boron isotopic compositions in growing corals from the South China Sea | |
Jun Xiao; Yingkai Xiao; Zhangdong Jin; Congqiang Liu; Maoyong He | |
2013 | |
Source Publication | Journal of Asian Earth Sciences
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Volume | 62Pages:561-567 |
Abstract | In order to determine incorporation of boron species, boron isotopic fractionation, and influence of trace elements on isotopic compositions of boron in corals (δ11Bcoral), concentrations of Mg, Sr, Na, B and δ11Bcoral in growing corals from the South China Sea were measured. Relative to seawater, Sr enriched while Mg depleted in corals in the South China Sea. Although the δ11Bcoral values were different from various species and were not closely correlated with the element concentrations in corals in the South China Sea, Mg(OH)2 existed in corals can result in high δ11Bcoral. Thus, it is necessary to examine the existence of Mg(OH)2and to choose the same species when δ11Bcoral is used in the δ11B-pH proxy. Based on the measured δ11B values of corals and coexisting seawater as well as the seawater pH in the South China Sea, a new isotopic fractionation factor a4-3 between B(OH)4- and B(OH)3 was determined to be 0.979. Besides B(OH)4- into corals, our results showed that B(OH)3 may also be incorporated into corals with variable proportions. The incorporation of B(OH)3 into corals may challenge the hypothesis of δ11Bcoral = δ11B4, resulting in increasing uncertainty to the calculated seawater pH values to the δ11B-pH proxy. We suggested that a best-fit empirical equation between δ11B of bio-carbonates and seawater pH needs to be established by the precipitation experiments of inorganic carbonates or culture experiments of corals or foraminifera. |
Keyword | Coral Trace Element Boron Isotope Δ11b-ph Proxy South China Sea |
Indexed By | SCI |
Language | 英语 |
Document Type | 期刊论文 |
Identifier | http://ir.gyig.ac.cn/handle/42920512-1/9403 |
Collection | 环境地球化学国家重点实验室 |
Affiliation | 1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China 2.Qinghai Institute of Salk Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China 3.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
Recommended Citation GB/T 7714 | Jun Xiao;Yingkai Xiao;Zhangdong Jin;Congqiang Liu;Maoyong He. Boron isotopic compositions in growing corals from the South China Sea[J]. Journal of Asian Earth Sciences,2013,62:561-567. |
APA | Jun Xiao;Yingkai Xiao;Zhangdong Jin;Congqiang Liu;Maoyong He.(2013).Boron isotopic compositions in growing corals from the South China Sea.Journal of Asian Earth Sciences,62,561-567. |
MLA | Jun Xiao;Yingkai Xiao;Zhangdong Jin;Congqiang Liu;Maoyong He."Boron isotopic compositions in growing corals from the South China Sea".Journal of Asian Earth Sciences 62(2013):561-567. |
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