Osmium uptake, distribution, and ¹⁸⁷Os/¹⁸⁸Os and ¹⁸⁷Re/¹⁸⁸Os compositions in Phaeophyceae macroalgae, Fucus vesiculosus: Implications for determining the ¹⁸⁷Os/¹⁸⁸Os composition of seawater

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• 作者：B. Racionero-Gó ; mez^a ; ^{blancaraci@gmail.com} ; A.D. Sproson^a ; D. Selby^a ; ^{david.selby@durham.ac.uk} ; A. Gannoun^b ; D.R. Grö ; cke^a ; H.C. Greenwell^a ; K.W. Burton^a
• 关键词：Osmium ; Macroalgae ; Rhenium ; Isotope composition ; Seawater ; Fucus vesiculosus
• 刊名：Geochimica et Cosmochimica Acta
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：199
• 期：Complete
• 页码：48-57
• 全文大小：883 K
• 卷排序：199

文摘

The osmium isotopic composition (187Os/188Os) of seawater reflects the balance of input from mantle-, continental- and anthropogenic-derived sources. This study utilizes the Phaeophyceae, Fucus vesiculosus, to analyse its Os abundance and uptake, as well as to assess if macroalgae records the Os isotope composition of the seawater in which it lives. The data demonstrates that Os is not located in one specific biological structure within macroalgae, but is found throughout the organism. Osmium uptake was measured by culturing F. vesiculosus non-fertile tips with different concentrations of Os with a known 187Os/188Os composition (∼0.16), which is significantly different from the background isotopic composition of local seawater (∼0.94). The Os abundance of cultured non-fertile tips show a positive correlation to the concentration of the Os doped seawater. Moreover, the 187Os/188Os composition of the seaweed equalled that of the culture medium, strongly confirming the possible use of macroalgae as a biological proxy for the Os isotopic composition of the seawater.