气候变化领域集成服务门户(CCPortal): High-resolution trace element distributions and models of trace element diffusion in enamel of Late Neolithic/Early Chalcolithic human molars from the Rioja Alavesa region (north-central Spain) help to separate biogenic from diagenetic trends

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DOI	10.1016/j.palaeo.2019.109260
	High-resolution trace element distributions and models of trace element diffusion in enamel of Late Neolithic/Early Chalcolithic human molars from the Rioja Alavesa region (north-central Spain) help to separate biogenic from diagenetic trends
	de Winter N.J.; Snoeck C.; Schulting R.; Fernández-Crespo T.; Claeys P.
发表日期	2019
ISSN	0031-0182
卷号	532
英文摘要	High resolution in situ trace element μXRF maps and profiles were measured on the enamel exposed in cross sections through archaeological human permanent molars from seven Late Neolithic/Early Chalcolithic funerary caves and megalithic graves of north-central Iberia. Changes in concentrations of Fe, Zn and Sr in inward direction into the enamel shed light on diagenetic and endogenous trace element concentrations in archaeological tooth enamel. Most of these profiles resemble sigmoid-shaped leaching profiles, suggesting that a combination of diffusion and advection processes govern the uptake of trace elements into the enamel from pore fluids on the outside of the tooth and in the more porous dentine. The present study shows how diffusion-advection (DA) models can be fitted to these trace element profiles to explain changes in trace element concentrations that happen during diagenesis. DA models explain a major part of the variation observed in leaching profiles into the enamel and can be used to reconstruct endogenous trace element concentrations, leaching times and leaching depth as well as trace element concentrations in ambient pore water during diagenesis. Models of trace element leaching together with trace element mapping reveal that Fe, Zn and Sr concentrations consistently increase during diagenesis, regardless of the type of burial site (i.e. funerary caves vs. megalithic graves). Profiles of Pb concentrations show much smaller concentration gradients, causing DA model fitting to be less accurate. Modelled leaching depths of 300–400 μm warrant a careful approach when sampling for endogenous archaeological tooth enamel for trace element and stable isotope analysis. Results also show that it is possible to reconstruct endogenous trace element concentrations from these samples, even without applying pretreatment procedures, because leaching of trace elements into the enamel often remains limited to the outer 300–400 μm of the enamel on archaeological timescales. Modelled leaching times are about ten times lower than the age of the samples, suggesting that the rate of trace element leaching into tooth enamel slows down or even halts during the burial period. © 2019 Elsevier B.V.
语种	英语
scopus关键词	advection; archaeology; biogenic deposit; diagenesis; diffusion; enamel; leaching; Neolithic; spatial distribution; tooth; trace element; trend analysis; Araba; Basque Country [Spain]; Iberian Peninsula; Spain
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150852
作者单位	Analytical, Environmental and Geochemistry Group (AMGC), Vrije Universiteit Brussel, Pleinlaan 2, Brussels, B-1050, Belgium; Geochemistry: Isotopic, Mineral and Element Tracing (G-Time), Université Libre de Bruxelles, 50 Avenue F.D. Roosevelt, Brussels, B-1050, Belgium; School of Archaeology, Oxford University, 36 Beaumont St., Oxford, OX1 2PG, United Kingdom; Peter Wall Institute for Advanced Sciences, University of British Columbia, 6331 Crescent Rd., Vancouver, BC V6T 1Z2, Canada
推荐引用方式 GB/T 7714	de Winter N.J.,Snoeck C.,Schulting R.,et al. High-resolution trace element distributions and models of trace element diffusion in enamel of Late Neolithic/Early Chalcolithic human molars from the Rioja Alavesa region (north-central Spain) help to separate biogenic from diagenetic trends[J],2019,532.
APA	de Winter N.J.,Snoeck C.,Schulting R.,Fernández-Crespo T.,&Claeys P..(2019).High-resolution trace element distributions and models of trace element diffusion in enamel of Late Neolithic/Early Chalcolithic human molars from the Rioja Alavesa region (north-central Spain) help to separate biogenic from diagenetic trends.Palaeogeography, Palaeoclimatology, Palaeoecology,532.
MLA	de Winter N.J.,et al."High-resolution trace element distributions and models of trace element diffusion in enamel of Late Neolithic/Early Chalcolithic human molars from the Rioja Alavesa region (north-central Spain) help to separate biogenic from diagenetic trends".Palaeogeography, Palaeoclimatology, Palaeoecology 532(2019).