دورية أكاديمية
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Stable isotope fractionation of strontium in coccolithophore calcite: Influence of temperature and carbonate chemistry.

التفاصيل البيبلوغرافية
العنوان: Stable isotope fractionation of strontium in coccolithophore calcite: Influence of temperature and carbonate chemistry.
المؤلفون: Müller MN; Department of Oceanography, Federal University of Recife, Cidade Universitária, Recife, PE, Brazil.; Oceanographic Institute at the University of São Paulo, São Paulo, SP, Brazil., Krabbenhöft A; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany., Vollstaedt H; Institute of Geological Science, University of Bern, Bern, Switzerland., Brandini FP; Oceanographic Institute at the University of São Paulo, São Paulo, SP, Brazil., Eisenhauer A; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany.
المصدر: Geobiology [Geobiology] 2018 May; Vol. 16 (3), pp. 297-306. Date of Electronic Publication: 2018 Feb 12.
نوع المنشور: Journal Article; Research Support, Non-U.S. Gov't
اللغة: English
بيانات الدورية: Publisher: Wiley Country of Publication: England NLM ID: 101185472 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1472-4669 (Electronic) Linking ISSN: 14724669 NLM ISO Abbreviation: Geobiology Subsets: MEDLINE
أسماء مطبوعة: Original Publication: Oxford, UK : Wiley, 2003-
مواضيع طبية MeSH: Chemical Phenomena* , Metabolism*, Calcium Carbonate/*metabolism , Phytoplankton/*chemistry , Phytoplankton/*metabolism , Strontium Isotopes/*analysis, Temperature
مستخلص: Marine calcifying eukaryotic phytoplankton (coccolithophores) is a major contributor to the pelagic production of CaCO 3 and plays an important role in the biogeochemical cycles of C, Ca and other divalent cations present in the crystal structure of calcite. The geochemical signature of coccolithophore calcite is used as palaeoproxy to reconstruct past environmental conditions and to understand the underlying physiological mechanisms (vital effects) and precipitation kinetics. Here, we present the stable Sr isotope fractionation between seawater and calcite (Δ 88/86 Sr) of laboratory cultured coccolithophores in individual dependence of temperature and seawater carbonate chemistry. Coccolithophores were cultured within a temperature and a pCO 2 range from 10 to 25°C and from 175 to 1,240 μatm, respectively. Both environmental drivers induced a significant linear increase in coccolith stable Sr isotope fractionation. The temperature correlation at constant pCO 2 for Emiliania huxleyi and Coccolithus braarudii is expressed as Δ 88/86 Sr = -7.611 × 10 -3 T + 0.0061. The relation of Δ 88/86 Sr to pCO 2 was tested in Emiliania huxleyi at 10 and 20°C and resulted in Δ 88/86 Sr = -5.394 × 10 -5 pCO 2 - 0.0920 and Δ 88/86 Sr = -5.742 × 10 -5 pCO 2 - 0.1351, respectively. No consistent relationship was found between coccolith Δ 88/86 Sr and cellular physiology impeding a direct application of fossil coccolith Δ 88/86 Sr as coccolithophore productivity proxy. An overall significant correlation was detected between the elemental distribution coefficient (D Sr ) and Δ 88/86 Sr similar to inorganic calcite with a physiologically induced offset. Our observations indicate (i) that temperature and pCO 2 induce specific effects on coccolith Δ 88/86 Sr values and (ii) that strontium elemental ratios and stable isotope fractionation are mainly controlled by precipitation kinetics when embedded into the crystal lattice and subject to vital effects during the transmembrane transport from seawater to the site of calcification. These results provide an important step to develop a coccolith Δ 88/86 Sr palaeoproxy complementing the existing toolbox of palaeoceanography.
(© 2018 John Wiley & Sons Ltd.)
فهرسة مساهمة: Keywords: coccolithophores; paleoproxy calibration; phytoplankton; stable Sr isotope fractionation
المشرفين على المادة: 0 (Strontium Isotopes)
H0G9379FGK (Calcium Carbonate)
تواريخ الأحداث: Date Created: 20180213 Date Completed: 20181120 Latest Revision: 20181120
رمز التحديث: 20221213
DOI: 10.1111/gbi.12276
PMID: 29431278
قاعدة البيانات: MEDLINE
الوصف
تدمد:1472-4669
DOI:10.1111/gbi.12276