Trace element concentrations as proxies for diagenetic alteration in the African archaeofaunal record: Implications for isotope analysis
Trace element concentrations as proxies for diagenetic alteration in the African archaeofaunal record: Implications for isotope analysis
复制标题
微量元素浓度作为非洲考古动物记录中成岩变化的代理:同位素分析的意义
DOI:
10.1016/j.jasrep.2024.104403
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发表时间:
2024
期刊:
影响因子:
--
通讯作者:
Knudson, Kelly J.
中科院分区:
文献类型:
--
作者:
Bertacchi, Alex;Zipkin, Andrew M.;Giblin, Julia;Gordon, Gwyneth;Goepfert, Tyler;Asael, Dan;Knudson, Kelly J.
Isotope ratio analyses of trace elements are applied to tooth enamel, ostrich eggshell, and other archaeological hard tissues to infer mobility and other aspects of hominin and animal paleoecology. It has been assumed that these highly mineralized tissues are resistant to diagenetic alteration, but this is seldom tested and some studies document diagenetic alteration over brief time spans. Here, we build on existing research on Maximum Threshold Concentrations (MTCs) to develop screening tools for diagenesis that can inform heavy isotopic analyses. The premise of the MTC approach is that archaeological tissues are likely contaminated and unsuitable for isotope ratio analysis when they exceed characteristic modern concentration ranges of trace elements. Furthermore, we propose a new metric called the Maximum Threshold Ratio (MTR) of85Rb/88Sr or whole element Rb/Sr, which can be measured simultaneously with87Sr/86Sr during laser ablation (LA) MC-ICP-MS or applied duringpost hocscreening of specimens. We analyzed 56 enamel samples from modern Kenyan mammals and 34 modern ostrich eggshells from South Africa, Namibia, and the United States by solution ICP-MS, as well as a subset of shells using LA-MC-ICP-MS. Our results indicate that thresholds are consistent across taxa at a single location, but likely vary across locations. Therefore, MTCs and MTRs need to be tissue and locality specific, but not necessarily taxon-specific. Other important differences are observed between the inner and outer surfaces of the eggshells and between LA and solution ICP-MS. This exploratory study provides guidelines for building reference thresholds to screen enamel and eggshell for diagenesis potentially impacting biogenic isotope ratios.
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影响因子:
2.8
作者:
G. Kamenov;E. Lofaro;G. Goad;John Krigbaum
通讯作者:
John Krigbaum
影响因子:
3.8
作者:
Michael Weber;F. Lugli;B. Hattendorf;D. Scholz;R. Mertz‐Kraus;D. Guinoiseau;K. Jochum
通讯作者:
Michael Weber;F. Lugli;B. Hattendorf;D. Scholz;R. Mertz‐Kraus;D. Guinoiseau;K. Jochum
DOI:
10.4324/9781315707709-20
发表时间:
2018
期刊:
Spectrochimica Acta Part B: Atomic Spectroscopy
影响因子:
--
作者:
J. Hodgkins;P. Roux;C. Marean;K. Penkman;Molly K. Crisp;Erich C. Fisher;J. Lee
通讯作者:
J. Lee
影响因子:
2.8
作者:
J. Lee-Thorp;N. J. Merwe
通讯作者:
J. Lee-Thorp;N. J. Merwe
影响因子:
4
作者:
Nina Kowalik;R. Anczkiewicz;Wolfgang Müller;C. Spötl;L. Bondioli;A. Nava;P. Wojtal;J. Wilczyński;Marta Koziarska;M. Matyszczak
通讯作者:
M. Matyszczak