Effects of oxidative weathering on Raman spectra of charcoal and bone chars: consequences in archaeology and paleothermometry
Chars are useful proxies in many disciplines such as the geosciences and archaeology. Raman spectrometry is frequently used in the characterization of such materials. However, when they are ancient and potentially altered, chars have the particularity of being oxidized, which can strongly disturb th...
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Académie des sciences
2023-01-01
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| Series: | Comptes Rendus. Géoscience |
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| Online Access: | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.186/ |
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| author | Deldicque, Damien Rouzaud, Jean-Noël Vandevelde, Ségolène Medina-Alcaide, Maria Ángeles Ferrier, Catherine Perrenoud, Christian Pozzi, Jean-Pierre Cabanis, Manon |
| author_facet | Deldicque, Damien Rouzaud, Jean-Noël Vandevelde, Ségolène Medina-Alcaide, Maria Ángeles Ferrier, Catherine Perrenoud, Christian Pozzi, Jean-Pierre Cabanis, Manon |
| author_sort | Deldicque, Damien |
| collection | DOAJ |
| description | Chars are useful proxies in many disciplines such as the geosciences and archaeology. Raman spectrometry is frequently used in the characterization of such materials. However, when they are ancient and potentially altered, chars have the particularity of being oxidized, which can strongly disturb the spectra and seriously distort their interpretation. In this study, we highlight the Raman parameters affected by oxidative weathering based on comparisons between the spectra of experimental and ancient chars, of vegetal and animal origin. This makes it possible to differentiate between unweathered and weathered chars and we show that the recent methods of Raman thermometry and precursor discrimination are no longer valid when applied to oxidized chars. Nonetheless, it remains possible to estimate the formation temperature of a charcoal when some fragments are preserved at the micrometre scale. Furthermore, we propose an original tool that enable us to distinguish the vegetal or animal origin of ancient and oxidized chars. We successfully apply this new tool to charred hearth residues of the Bruniquel cave (France). |
| format | Article |
| id | doaj-art-c3239049a8e9410a8a6b0b52f3906cb4 |
| institution | Kabale University |
| issn | 1778-7025 |
| language | English |
| publishDate | 2023-01-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Géoscience |
| spelling | doaj-art-c3239049a8e9410a8a6b0b52f3906cb42025-02-07T10:39:55ZengAcadémie des sciencesComptes Rendus. Géoscience1778-70252023-01-01355G112210.5802/crgeos.18610.5802/crgeos.186Effects of oxidative weathering on Raman spectra of charcoal and bone chars: consequences in archaeology and paleothermometryDeldicque, Damien0https://orcid.org/0000-0003-0422-8849Rouzaud, Jean-Noël1https://orcid.org/0000-0002-1933-2617Vandevelde, Ségolène2https://orcid.org/0000-0002-0399-4560Medina-Alcaide, Maria Ángeles3https://orcid.org/0000-0002-7983-5988Ferrier, Catherine4https://orcid.org/0000-0003-2347-7170Perrenoud, Christian5https://orcid.org/0000-0001-9704-1172Pozzi, Jean-Pierre6Cabanis, Manon7https://orcid.org/0000-0002-3750-3168Laboratoire de Géologie, Département de géosciences, École normale supérieure, CNRS, UMR 8538, PSL University, Paris, FranceLaboratoire de Géologie, Département de géosciences, École normale supérieure, CNRS, UMR 8538, PSL University, Paris, FranceLaboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, UMR8212 LSCE, Site de l’Orme des Merisiers, Chemin de Saint Aubin - RD 128, 91191 Gif sur Yvette Cedex, France; Université Paris 1 – Panthéon-Sorbonne, UMR7041 ArScAn, MSH Mondes, 21 allée de l’université, 92023 Nanterre Cedex, FranceUniversité de Bordeaux, PACEA, UMR 5199 CNRS-UB-MC, Allée Geoffroy-Saint-Hilaire, CS 5003, 33615 Pessac Cedex, FranceUniversité de Bordeaux, PACEA, UMR 5199 CNRS-UB-MC, Allée Geoffroy-Saint-Hilaire, CS 5003, 33615 Pessac Cedex, FranceUMR 7194 HNHP, Département Homme et Environnement, Muséum National d’Histoire Naturelle, Centre Européen de Recherches Préhistoriques, avenue Grégory, 66720 Tautavel, FranceLaboratoire de Géologie, Département de géosciences, École normale supérieure, CNRS, UMR 8538, PSL University, Paris, FranceGEOLAB - Laboratoire de Géographie Physique et Environnementale, France; Inrap - Institut national de recherches archéologiques préventives, FranceChars are useful proxies in many disciplines such as the geosciences and archaeology. Raman spectrometry is frequently used in the characterization of such materials. However, when they are ancient and potentially altered, chars have the particularity of being oxidized, which can strongly disturb the spectra and seriously distort their interpretation. In this study, we highlight the Raman parameters affected by oxidative weathering based on comparisons between the spectra of experimental and ancient chars, of vegetal and animal origin. This makes it possible to differentiate between unweathered and weathered chars and we show that the recent methods of Raman thermometry and precursor discrimination are no longer valid when applied to oxidized chars. Nonetheless, it remains possible to estimate the formation temperature of a charcoal when some fragments are preserved at the micrometre scale. Furthermore, we propose an original tool that enable us to distinguish the vegetal or animal origin of ancient and oxidized chars. We successfully apply this new tool to charred hearth residues of the Bruniquel cave (France).https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.186/Raman spectrometryOxidative weatheringCharcoalAnimal charsCharred boneArchaeologyPyroclastic flow |
| spellingShingle | Deldicque, Damien Rouzaud, Jean-Noël Vandevelde, Ségolène Medina-Alcaide, Maria Ángeles Ferrier, Catherine Perrenoud, Christian Pozzi, Jean-Pierre Cabanis, Manon Effects of oxidative weathering on Raman spectra of charcoal and bone chars: consequences in archaeology and paleothermometry Comptes Rendus. Géoscience Raman spectrometry Oxidative weathering Charcoal Animal chars Charred bone Archaeology Pyroclastic flow |
| title | Effects of oxidative weathering on Raman spectra of charcoal and bone chars: consequences in archaeology and paleothermometry |
| title_full | Effects of oxidative weathering on Raman spectra of charcoal and bone chars: consequences in archaeology and paleothermometry |
| title_fullStr | Effects of oxidative weathering on Raman spectra of charcoal and bone chars: consequences in archaeology and paleothermometry |
| title_full_unstemmed | Effects of oxidative weathering on Raman spectra of charcoal and bone chars: consequences in archaeology and paleothermometry |
| title_short | Effects of oxidative weathering on Raman spectra of charcoal and bone chars: consequences in archaeology and paleothermometry |
| title_sort | effects of oxidative weathering on raman spectra of charcoal and bone chars consequences in archaeology and paleothermometry |
| topic | Raman spectrometry Oxidative weathering Charcoal Animal chars Charred bone Archaeology Pyroclastic flow |
| url | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.186/ |
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