Calcium oxalate radiocarbon dating: preliminary tests to date rock art of decorated open-air caves of Erongo Mountains in Namibia
| Autor: | C Moreau, Matthieu Lebon, Alma Nankela, David Pleurdeau, Lucile Beck, Ingrid Caffy, Emmanuelle Delqué-Količ, Marc Sieudat, Marion Perron, B Thellier, Guilhem Mauran, Jean-Pascal Dumoulin |
|---|---|
| Přispěvatelé: | Laboratoire de mesure du carbone 14 (LMC14 - UMS 2572), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Histoire naturelle de l'Homme préhistorique (HNHP), Muséum national d'Histoire naturelle (MNHN)-Université de Perpignan Via Domitia (UPVD)-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010506 paleontology
Archeology [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory Calcium oxalate Geochemistry 01 natural sciences Natural (archaeology) Oxalate law.invention chemistry.chemical_compound Cave law 0601 history and archaeology Radiocarbon dating ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences Open air Total organic carbon geography geography.geographical_feature_category 060102 archaeology 06 humanities and the arts chemistry General Earth and Planetary Sciences Rock art Geology |
| Zdroj: | Radiocarbon Radiocarbon, University of Arizona, 2020, 62 (6), pp.1551-1562 Radiocarbon, 2020, 62 (6), pp.1551-1562. ⟨10.1017/RDC.2020.81⟩ Radiocarbon, University of Arizona, 2020, 62 (6), pp.1551-1562. ⟨10.1017/RDC.2020.81⟩ |
| ISSN: | 0033-8222 1945-5755 |
| DOI: | 10.1017/RDC.2020.81⟩ |
| Popis: | The direct dating of rock paintings is not always possible due to the lack of organic carbon compounds in pigments, or because sampling from a heritage site is often restricted. To overcome these limitations, dating laboratories have to develop new approaches. In this study, we consider sampling calcium oxalate crusts covering the painted artworks as a way to indirectly date the rock art. This stratigraphic approach includes isolating and extracting pure oxalate from the crusts. The approach was tested on natural bulk accretions collected in the open-air sites of Erongo Mountains in Namibia. The accretions were separated into two phases (pure oxalate and the remaining residues) with a special pretreatment. This process removes carbonates through acidification (HCl 6N) and dissolves the oxalate into the supernatant, leaving the minerals and windblown organic compounds in the residue. The efficiency of the separation was checked on the two phases by FTIR analyses and by 14C dating and showed that pure oxalate powders were indeed obtained. AMS radiocarbon results of various accretions on the same art panels provided ages from modern periods to 2410 ± 35 BP. From these first results, more targeted sampling campaigns can be considered to provide a terminus ante quem for the rock art. |
| Databáze: | OpenAIRE |
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