The coordination and distribution of B in foraminiferal calcite

The coordination and distribution of B in foraminiferal calcite. Branson, O., Kaczmarek, K., Redfern, S. A., Misra, S., Langer, G., Tyliszczak, T., Bijma, J., & Elderfield, H. Earth and Planetary Science Letters, 416:67–72, April, 2015.

Paper doi abstract bibtex

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.

@article{branson_coordination_2015,
	title = {The coordination and distribution of {B} in foraminiferal calcite},
	volume = {416},
	issn = {0012821X},
	url = {https://linkinghub.elsevier.com/retrieve/pii/S0012821X15000849},
	doi = {10.1016/j.epsl.2015.02.006},
	abstract = {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.},
	language = {en},
	urldate = {2020-07-28},
	journal = {Earth and Planetary Science Letters},
	author = {Branson, Oscar and Kaczmarek, Karina and Redfern, Simon A.T. and Misra, Sambuddha and Langer, Gerald and Tyliszczak, Tolek and Bijma, Jelle and Elderfield, Henry},
	month = apr,
	year = {2015},
	pages = {67--72},
}

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