Format du dépôt |
Fichier |
Type de dépôt |
Article dans une revue |
Résumé |
en
Two stalagmites from Nerja cave (Andalusia, Spain) were studied. The cave is well known because of its long human occupation from the Upper Palaeolithic to the Chalcolithic and its abundant parietal prehistoric Art. The aims of this study were twofold: i) to compare uranium/thorium (230Th/234U) and Carbon-14 (14C) ages obtained all along the growth axis of the stalagmites in order to understand the consequences of diagenetic processes on the validity of radiometric ages; ii) as one of the stalagmites contains black layers, attributed to combustion soot, to establish when these intense hearths were used and by which culture.
230Th/234U and 14C ages were coupled with mineralogical studies using FTIR (Fourier-transform infrared spectroscopy) and thin section observations. The first stalagmite (GN16-9b) displays 230Th/234U ages in stratigraphic order, and compatible with 14C ages corrected for a few percent of dead carbon. Homogeneous composition of aragonitic crystals characterized by their needle-like texture is observed throughout this speleothem. For the second stalagmite (GN16-7), in contrast, 230Th/234U ages display large significant inversions and discordant results on the upper part and at the base of the stalagmite, suggesting a possible open system behavior for this chronometer. Interestingly, 14C ages are in stratigraphic order all along the stalagmite and are compatible with 230Th/234U ages only in its central part. Mineralogical studies display evidence of aragonite to calcite transformation at the top and a complex mineralogical assemblage with interlayered silicates (possibly clays) and calcitic mineralogy for the base of GN16-7. In these parts, discordant 230Th/234U ages were measured. In the middle part of the stalagmite, however, where the fibrous aragonite is well preserved, the 14C and 230Th/234U ages agree. Our data suggest that in the case of aragonite to calcite transformation as shown here, 230Th/234U ages are biased, but 14C ages seem to remain accurate, as already observed in aragonitic marine bio minerals. 14C ages obtained are used for the chronology of the soot layer, determined here between 7900 and 5500 years Cal BP, coherent with previous analysis of charcoals in the same sector of the cave. This study highlights the importance of working with at least two chronometers when stratigraphic age verification is not possible, as is the case of some parietal CaCO3 thin layers used for rock art dating. Recent 230Th/234U ages published for carbonate deposits on Spanish parietal Art are discussed in light of this demonstration.
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Titre |
en
U-series and radiocarbon cross dating of speleothems from Nerja Cave (Spain): Evidence of open system behavior. Implication for the Spanish rock art chronology
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Auteur(s)
|
E. Pons-Branchu
1, 2
, J. Barbarand
3
, I. Caffy
1, 4
, A. Dapoigny
1, 2
, L. Drugat
1, 2
, J.P. Dumoulin
1, 4
, M.A. Medina Alcaide
5, 6
, J. Nouet
3
, J.L. Sanchidrián Torti
6
, N. Tisnérat-Laborde
1, 2
, C. Jiménez de Cisneros
7
, H. Valladas
1, 2
1
LSCE -
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
( 518 )
- Bât. 12,
avenue de la Terrasse,
F-91198 GIF-SUR-YVETTE CEDEX
- France
-
Université de Versailles Saint-Quentin-en-Yvelines UMR8212 ( 81173 )
;
-
Institut national des sciences de l'Univers UMR8212 ( 300045 )
;
-
Université Paris-Saclay ( 419361 )
;
-
Centre National de la Recherche Scientifique UMR8212 ( 441569 )
;
-
Direction de Recherche Fondamentale (CEA) ( 465913 )
;
-
Commissariat à l'énergie atomique et aux énergies alternatives ( 300016 )
2
GEOTRAC -
Géochrononologie Traceurs Archéométrie
( 578523 )
- LSCE. CEA Paris-Saclay. Orme des merisiers. 91190 Saint-Aubin.
- France
-
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] DRF/LSCE ( 518 )
;
-
Université de Versailles Saint-Quentin-en-Yvelines UMR8212 ( 81173 )
;
-
Institut national des sciences de l'Univers UMR8212 ( 300045 )
;
-
Université Paris-Saclay ( 419361 )
;
-
Centre National de la Recherche Scientifique UMR8212 ( 441569 )
;
-
Direction de Recherche Fondamentale (CEA) ( 465913 )
;
-
Commissariat à l'énergie atomique et aux énergies alternatives ( 300016 )
3
GEOPS -
Géosciences Paris Saclay
( 580892 )
- Université Paris Saclay, bâts. 504 & 510, 91405 ORSAY Cedex
- France
-
Institut national des sciences de l'Univers UMR8148 ( 300045 )
;
-
Université Paris-Saclay UMR8148 ( 419361 )
;
-
Centre National de la Recherche Scientifique UMR8148 ( 441569 )
4
LMC14 - UMS 2572 -
Laboratoire de mesure du carbone 14
( 1881 )
- Bâtiment 450 - Porte 4E CEA Saclay 91191 GIF SUR YVETTE CEDEX
- France
-
Commissariat à l'énergie atomique et aux énergies alternatives DSM/LSCE ( 300016 )
;
-
Institut de Radioprotection et de Sûreté Nucléaire ( 300040 )
;
-
Ministère de la Culture et de la Communication ( 300125 )
;
-
Centre National de la Recherche Scientifique UMS2572 ( 441569 )
5
PACEA -
De la Préhistoire à l'Actuel : Culture, Environnement et Anthropologie
( 205557 )
- Université de Bordeaux - Bâtiment B8 - CS50023 - Allée Geoffroy-Saint-Hilaire - 33615 Pessac Cedex
- France
-
Université de Bordeaux ( 259761 )
;
-
Centre National de la Recherche Scientifique UMR5199 ( 441569 )
6
Universidad de Córdoba = University of Córdoba [Córdoba]
( 154991 )
- Avd. Medina Azahara, 5 14071 Córdoba
- Espagne
7
UGR -
Universidad de Granada = University of Granada
( 302726 )
- Avda. del Hospicio, s/n C.P. 18010 Granada
- Espagne
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Date de publication électronique |
2022-07-09
|
Langue du document |
Anglais
|
Nom de la revue |
|
Date de publication |
2022
|
Volume |
290
|
Page/Identifiant |
107634
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Domaine(s) |
-
Planète et Univers [physics]/Sciences de la Terre
-
Sciences de l'Homme et Société/Archéologie et Préhistoire
|
Projet(s) ANR |
-
Datations croisées uranium-thorium, uranium-protactinium et carbone-14 de carbonates secondaires en grottes : recherche de critères de validation des échantillons et des âges : Application à l'art pariétal
[En savoir plus]
ApART -
ANR-18-CE27-0004
AAPG2018
- 2018
|
Collaboration/Projet |
-
ANR ApART,
-
Plateforme Panoply
|
Mots-clés |
en
Rock art chronology, Uranium-thorium ages, 14C chronology, FTIR analysis, Stalagmites
|
DOI |
10.1016/j.quascirev.2022.107634 |