globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116287
论文题名:
Extreme silicon isotope fractionation due to Si organic complexation: Implications for silica biomineralization
作者: Stamm F.M.; Méheut M.; Zambardi T.; Chmeleff J.; Schott J.; Oelkers E.H.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 541
语种: 英语
中文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165280
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Stamm F.M.,Méheut M.,Zambardi T.,et al. Extreme silicon isotope fractionation due to Si organic complexation: Implications for silica biomineralization[J]. Earth and Planetary Science Letters,2020-01-01,541
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