DOI: 10.1016/j.quascirev.2016.06.004
论文题名: Correlation of bulk sedimentary and compound-specific δ13C values indicates minimal pre-aging of n-alkanes in a small tropical watershed
作者: Lane C.S. ; Horn S.P. ; Taylor Z.P. ; Kerr M.T.
刊名: Quaternary Science Reviews
出版年: 2016
卷: 145 起始页码: 238
结束页码: 242
语种: 英语
英文关键词: Biomarker
; Dominican Republic
; Isotope
; Maize
; Radiocarbon
Scopus关键词: Biomarkers
; Isotopes
; Matrix algebra
; Sedimentology
; Sediments
; Submarine geology
; Allochthonous organic matter
; Dominican Republic
; Maize
; Positive correlations
; Radiocarbon
; Sediment geochemistries
; Terrestrial biomarkers
; Terrestrial environments
; Paraffins
; alkane
; biomarker
; carbon isotope
; correlation
; fossil record
; lacustrine deposit
; maize
; marine sediment
; nearshore environment
; paleoclimate
; paleoecology
; pollen
; radiocarbon dating
; sediment chemistry
; sediment core
; watershed
; Dominican Republic
; Zea mays
英文摘要: Inherent to sedimentary compound-specific isotopic proxies of paleoecological and paleoclimate change is the assumption that biomarkers are coeval with the surrounding sedimentary matrix. Compound-specific radiocarbon analyses of lake and nearshore marine sediments have indicated a potential offset between the ages of terrestrial biomarkers and their surrounding sediments that could confound efforts to establish strong chronological control for compound-specific isotopic data. We conducted high-resolution compound-specific δ13C analyses of n-alkanes (δ13Calkane) in a well-studied sediment core from Laguna Castilla, Dominican Republic, and compared the results to bulk sedimentary δ13C (δ13Cbulk), fossil pollen, and sediment geochemistry to assess potential 'pre-aging' of alkanes in the terrestrial environment prior to deposition. We found significant positive correlations between δ13Cbulk values and δ13Calkane values, indicating little or no temporal lag in the response of δ13Calkane values to vegetation change and thus little or no offset in the age of terrestrially-derived compounds and the organic fraction of the sedimentary matrix. While this study highlights the need for further research into the variables affecting age offsets between proxy data, we propose the comparison of δ13Cbulk and δ13Calkane values as a method to assess potential age offsets between compound-specific and other proxy datasets, particularly in small watersheds with sediment records containing a high proportion of allochthonous organic matter. This method is more available to researchers than obtaining numerous compound-specific radiocarbon analyses, which are costly and not a routine service offered by radiocarbon facilities. © 2016 Elsevier Ltd. 资助项目: Lane, C.S.
; Department of Earth and Ocean Sciences, University of North Carolina WilmingtonUnited States
; 电子邮件: lanec@uncw.edu
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59547
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth and Ocean Sciences, University of North Carolina Wilmington, Wilmington, NC, United States; Department of Geography, University of Tennessee, Knoxville, TN, United States; Environmental Science Program, Berry College, Rome, GA, United States
Recommended Citation:
Lane C.S.,Horn S.P.,Taylor Z.P.,et al. Correlation of bulk sedimentary and compound-specific δ13C values indicates minimal pre-aging of n-alkanes in a small tropical watershed[J]. Quaternary Science Reviews,2016-01-01,145