首页|Disentangling diagenetic and biogenic trace elements and Sr radiogenic isotopes in fossil dental enamel using laser ablation analysis

Disentangling diagenetic and biogenic trace elements and Sr radiogenic isotopes in fossil dental enamel using laser ablation analysis

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  • NSTL
  • Elsevier
The reconstruction of life histories traits such as the ontogenic evolution of diet or sequences of mobility can be achieved for fossil mammals thanks to laser ablation analysis of trace elements concentration and radiogenic Sr isotope composition in dental enamel. However, a major limitation for the use of laser ablation to study fossil tooth enamel is that the analysis must be carried out on bulk sample hence prohibiting any ad hoc leaching step to remove diagenetic compounds. Biogenic and diagenetic trace elements along with the ~(87)Sr/~(86)Sr ratio must be monitored and post hoc correlation tests processed to isolate areas free of diagenesis. The present study combines a unique combination of biogenic (Sr and Ba), diagenetic (Mn and U) trace elements, major elements (Mg and Ca) and ~(87)Sr/~(86)Sr ratio time series obtained by means of laser ablation ICPMS and MC-ICPMS on a large number (n = 94) of fossil tooth enamel samples of humans and animals from a set of neighboring Neolithic sites in France. Bone fragments sampled from the same specimens are also analyzed for comparison. Trends between diagenetic and biogenic trace and major elements are first identified using inclusive data analysis. The trends are then validated at the scale of the laser ablation raster, and a protocol of data cleaning is developed to identify areas free of diagenesis. Non-significantly altered Sr/Ca, Ba/Ca and ~(87)Sr/~(86)Sr average values are thus gathered for each cleaned tooth enamel samples and are discussed, along with previously measured bone collagen δ~(13)C and δ~(15)N values, in terms of diet and mobility in the context of the Neolithic revolution.

Laser ablationTrace elementsStrontium isotopesNeolithicDietMobilityEnamelBone

Léonie Rey、Théo Tacail、Frédéric Santos、Stéphane Rottier、Gwena?lle Goude、Vincent Balter

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CNRS UMR 5199, PACEA, Univ. Bordeaux, Allée Geoffroy Saint Hilaire, CS 50023, 33615 Pessac Cedex, France

Bristol Isotope Group, School of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK

Aix Marseille Univ, CNRS, Minist Culture, LAMPEA, Aix-en-Provence, France

CNRS UMR 5276, LGLTPE, Univ. Lyon, ENS de Lyon, Univ. Lyon1. 46, Allée d'Italie, 69342 Lyon Cedex 07, France

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2022

10.1016/j.chemgeo.2021.120608

Chemical geology

Chemical geology

EISCI
ISSN：0009-2541
年,卷(期)：2022.587
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