globalchange  > 过去全球变化的重建
DOI: 10.1016/j.epsl.2015.02.006
论文题名:
The coordination and distribution of B in foraminiferal calcite
作者: Oscar Bransona; b; ; ; Karina Kaczmarekc; Simon A.T. Redferna; Sambuddha Misraa; Gerald Langera; Tolek Tyliszczakc; Jelle Bijmad; Henry Elderfielda
刊名: Earth and Planetary Science Letters
ISSN: 0012-954X
出版年: 2015
卷: Volume 416, 页码:Pages 67-72
语种: 英语
英文关键词: δ11B ; B/Ca ; boron ; foraminifera ; biomineralisation ; palaeoproxy
英文摘要: The isotopic ratio and concentration of B in foraminiferal calcite appear to reflect the pH and bicarbonate concentration of seawater. The use of B as a chemical proxy tracer has the potential to transform our understanding of the global carbon cycle, and ocean acidification processes. However, discrepancies between the theory underpinning the B proxies, and mineralogical observations of B coordination in biomineral carbonates call the basis of these proxies into question. Here, we use synchrotron X-ray spectromicroscopy to show that B is hosted solely as trigonal BO3 in the calcite test of Amphistegina lessonii, and that B concentration exhibits banding at the micron length scale. In contrast to previous results, our observation of trigonal B agrees with the predictions of the theoretical mechanism behind B palaeoproxies. These data strengthen the use of B for producing palaeo-pH records. The observation of systematic B heterogeneity, however, highlights the complexity of foraminiferal biomineralisation, implying that B incorporation is modulated by biological or crystal growth processes.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11968
Appears in Collections:过去全球变化的重建
影响、适应和脆弱性

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Recommended Citation:
Oscar Bransona,b,,et al. The coordination and distribution of B in foraminiferal calcite[J]. Earth and Planetary Science Letters,2015-01-01,Volume 416
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