Communication Dans Un Congrès Année : 2020

The Pigmentotheque: presentation of a set of geological standards

Résumé

The iron oxi(hydroxi)de-rich rocks used during the Prehistory are very various and require a robust geological, structural and geochemical characterization in order to discriminate them and to be able to make relationship with specific geological formation, or even precise outcrops. The issue of the creation of the « pigmentotheque » is based on the capacity to establish an ID card, specific for each geological deposit or group of deposits. The ferruginous rocks, associated to various geological formations and evolution contexts, present distinctive features at various scales of observation and analysis. To obtain a specific identification for each raw material, a rigorous methodology is required starting from the sampling in the field to the use of complementary and multi-scale methods. According to the nature of the rocks and the archaeological remains, the fingerprints could be then obtained thanks to petrography (at macro-, meso- or micro-scale), mineralogy (nature and association of minerals, crystallinity) and geochemistry (content in major, minor and trace elements). The most challenging issue of this research is to be able to compare, with the same criteria and comparable results, geological references (without constraints) to divers kinds of archaeological remains (solid rocks and applied pigments). Due to conservational considerations in this case, only little quantities and often weathered are available for analysis. To overcome these methodological limits, we develop a combination of physicochemical measures using our own geological standards (iron-rich rocks). This set of reference samples is currently shared with other teams of research and is increasing with certified geological standards in order to cover the large variability of petrographic nature and geological origin. This set of references, already analyzed with other methods, is used both to fix the analytical parameters and to quantify with high precision the limits of detection. Consequently, this will increase the robustness of the protocol (measurements and sample preparation) and enable the comparison between experiments (pXRF, petrography, PIXE and ICPAES, ICPMS).

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hal-05003755 , version 1 (06-02-2026)

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  • HAL Id : hal-05003755 , version 1

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Emilie Chalmin, Hélène Salomon, Claire Chanteraud, Anne-Lise Develle, Aurélie Chassin de Kergommeaux, et al.. The Pigmentotheque: presentation of a set of geological standards. International Symposium on Archaeometry, May 2020, Lisbon, Portugal. ⟨hal-05003755⟩
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