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DOI	10.1016/j.epsl.2020.116287
	Extreme silicon isotope fractionation due to Si organic complexation: Implications for silica biomineralization
	Stamm F.M.; Méheut M.; Zambardi T.; Chmeleff J.; Schott J.; Oelkers E.H.
发表日期	2020
ISSN	0012821X
卷号	541
英文摘要	A combination of theoretical predictions and isotopic equilibration experiments using the three-isotope method have been performed to assess Si isotope fractionation among minerals, and aqueous species in the presence of dissolved catechol. Aqueous Si in abiotic ambient temperature aqueous solutions is dominated by the IV-coordinated H4SiO4 0 species, but the presence of aqueous catechol provokes the formation of a VI-fold Si-catechol complex. Results show an equilibrium Si fractionation factor of ∼19‰ between the VI-fold coordinated Si-catechol complex and the IV-fold coordinated aqueous silicic acid, an amplitude never previously observed for silicon. The fractionation between V-fold Si-organo complexes (with diolate, glyconate or methyllactate groups) and silicic acid has also been estimated through theoretical predictions to be about −10‰. These extreme fractionations can be used to improve our ability to interpret the Si isotope compositions of natural solids, and in particular those associated with marine silica biomineralization processes (e.g. sponge spicules). © 2020 Elsevier B.V.
关键词	equilibrium isotope fractionation first principle calculation organo-silicon complexes Si coordination change silicon three-isotope method
英文关键词	Biomineralization; Coordination reactions; Phenols; Silica; Aqueous species; Fractionation factors; Isotopic equilibration; Organic complexation; Si isotopes; Silica biomineralization; Silicic acids; Silicon isotopes; Isotopes; aqueous solution; benzene; biomineralization; complexation; experimental study; isotopic composition; isotopic fractionation; silicon; theoretical study
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202902
作者单位	Géosciences Environnement Toulouse, CNRS-UPS-OMP, 14 av. Édouard Belin, Toulouse, 31400, France; LEGOS, Laboratoire d'Etudes en Géophysique et Océanographie Spatiales (CNRS/UPS/CNES/IRD), Observatoire Midi-Pyrénées, 14 Avenue Edouard Belin, Toulouse, 31400, France; Department of Earth Sciences, UCL, Gower Street, London, WC1E 6BT, United Kingdom
推荐引用方式 GB/T 7714	Stamm F.M.,Méheut M.,Zambardi T.,et al. Extreme silicon isotope fractionation due to Si organic complexation: Implications for silica biomineralization[J],2020,541.
APA	Stamm F.M.,Méheut M.,Zambardi T.,Chmeleff J.,Schott J.,&Oelkers E.H..(2020).Extreme silicon isotope fractionation due to Si organic complexation: Implications for silica biomineralization.Earth and Planetary Science Letters,541.
MLA	Stamm F.M.,et al."Extreme silicon isotope fractionation due to Si organic complexation: Implications for silica biomineralization".Earth and Planetary Science Letters 541(2020).