DOI: 10.1016/j.quascirev.2018.03.030
Scopus记录号: 2-s2.0-85046116938
论文题名: Effects of cleaning methods upon preservation of stable isotopes and trace elements in shells of Cyprideis torosa (Crustacea, Ostracoda): Implications for palaeoenvironmental reconstruction
作者: Roberts L.R. ; Holmes J.A. ; Leng M.J. ; Sloane H.J. ; Horne D.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 189 起始页码: 197
结束页码: 209
语种: 英语
英文关键词: Calcite dissolution
; Cleaning protocols
; Cyprideis torosa
; Micropaleontology
; Ostracods
; Stable isotopes
; Trace elements
Scopus关键词: Analytical geochemistry
; Animals
; Calcite
; Chemical cleaning
; Isotopes
; Oxidation
; Calcite dissolution
; Cleaning protocols
; Cyprideis torosa
; Micropaleontology
; Ostracods
; Stable isotopes
; Trace elements
; calcite
; cleaner production
; dissolution
; fossil record
; geochemistry
; methodology
; micropaleontology
; ostracod
; oxidation
; paleoenvironment
; paleotemperature
; preservation
; reconstruction
; shell
; stable isotope
; trace element
; Crustacea
; Cyprideis torosa
; Ostracoda
英文摘要: The trace element (Sr/Ca and Mg/Ca) and stable isotope (δ18O and δ13C) geochemistry of fossil ostracod valves provide valuable information, particularly in lacustrine settings, on palaeo-water composition and palaeotemperature. The removal of sedimentary and organic contamination prior to geochemical analysis is essential to avoid bias of the results. Previous stable isotope and trace element work on ostracod shells has, however, employed different treatments for the removal of contamination beyond simple ‘manual’ cleaning using a paint brush and methanol under a low-power binocular microscope. For isotopic work pre-treatments include chemical oxidation, vacuum roasting and plasma ashing, and for trace element work sonication, chemical oxidation and reductive cleaning. The impact of different treatments on the geochemical composition of the valve calcite has not been evaluated in full, and a universal protocol has not been established. Here, a systematic investigation of the cleaning methods is undertaken using specimens of the ubiquitous euryhaline species, Cyprideis torosa. Cleaning methods are evaluated by undertaking paired analyses on a single carapace (comprising two valves); in modern ostracods, whose valves are assumed to be unaltered, the two valves should have identical geochemical and isotopic composition. Hence, when one valve is subjected to the chosen treatment and the other to simple manual cleaning any difference in composition can confidently be assigned to the treatment method. We show that certain cleaning methods have the potential to cause alteration to the geochemical signal, particularly Mg/Ca and δ18O, and hence have implications for palaeoenvironmental reconstructions. For trace–element determinations we recommend cleaning by sonication and for stable isotope analysis, oxidation by hydrogen peroxide. These methods remove contamination, yet do not significantly alter the geochemical signal. © 2018 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112203
Appears in Collections: 气候减缓与适应
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作者单位: School of Geography, Queen Mary, University of London, Mile End Road, London, E1 4NS, United Kingdom; Environmental Change Research Centre, Department of Geography, University College London, Gower Street, London, WC1E 6BT, United Kingdom; NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham, NG12 5GG, United Kingdom; Centre for Environmental Geochemistry, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, NE12 5RD, United Kingdom
Recommended Citation:
Roberts L.R.,Holmes J.A.,Leng M.J.,et al. Effects of cleaning methods upon preservation of stable isotopes and trace elements in shells of Cyprideis torosa (Crustacea, Ostracoda): Implications for palaeoenvironmental reconstruction[J]. Quaternary Science Reviews,2018-01-01,189