The subfossil tree deposits from the Garonne Valley and their implications on Holocene alluvial plain dynamics
Jean-Michel Carozza
(1)
,
Laurent Carozza
(1)
,
Philippe Valette
(1)
,
Muriel Llubes
(2)
,
Vanessa Py
(1)
,
Didier Galop
(1)
,
Mihaela Danu
(3)
,
Laurie Ferdinand
(1)
,
Mélodie David
(1)
,
Laurent Sévègnes
(4)
,
Laurent Bruxelles
(5)
,
Marc Jarry
(5, 6)
,
Francis Duranthon
(7)
1
GEODE -
Géographie de l'environnement
2 GET - Géosciences Environnement Toulouse
3 Université de Iasi
4 SRA - Service Régional de l'Archéologie
5 Inrap - Institut national de recherches archéologiques préventives
6 TRACES - Travaux et recherches archéologiques sur les cultures, les espaces et les sociétés
7 AMIS - Anthropologie Moléculaire et Imagerie de Synthèse
2 GET - Géosciences Environnement Toulouse
3 Université de Iasi
4 SRA - Service Régional de l'Archéologie
5 Inrap - Institut national de recherches archéologiques préventives
6 TRACES - Travaux et recherches archéologiques sur les cultures, les espaces et les sociétés
7 AMIS - Anthropologie Moléculaire et Imagerie de Synthèse
Jean-Michel Carozza
- Fonction : Auteur
- PersonId : 6431
- IdHAL : jean-michel-carozza
- ORCID : 0000-0001-9077-9182
- IdRef : 16394749X
Laurent Carozza
- Fonction : Auteur
- PersonId : 184259
- IdHAL : laurent-carozza
- ORCID : 0000-0002-3861-7474
- IdRef : 057500886
Philippe Valette
- Fonction : Auteur
- PersonId : 949340
- IdHAL : philippe-valette
- ORCID : 0000-0002-0075-2734
Muriel Llubes
- Fonction : Auteur
- PersonId : 950674
- ORCID : 0000-0002-8166-8437
- IdRef : 131549693
Vanessa Py
- Fonction : Auteur
- PersonId : 8074
- IdHAL : vanessa-py-saragaglia
- ORCID : 0000-0002-4890-7790
- IdRef : 146753410
Didier Galop
- Fonction : Auteur
- PersonId : 13698
- IdHAL : didier-galop
- ORCID : 0000-0003-1746-4760
- IdRef : 035586850
Laurent Bruxelles
- Fonction : Auteur
- PersonId : 171314
- IdHAL : laurent-bruxelles
- ORCID : 0000-0002-7174-2111
- IdRef : 06956163X
Marc Jarry
- Fonction : Auteur
- PersonId : 19171
- IdHAL : marc-jarry
- ORCID : 0000-0002-8017-3774
- IdRef : 236697234
Résumé
Subfossil tree trunks deposits are common in large rivers, but their status as a source for dating alluvial sequences and palaeoenvironmental studies is still discussed. Particularly their origin and the process(es) of deposition as well as a possible remobilization were pointed as a limit to their use to document river alluvial changes. In this work we report the discovery of the largest subfossil trunks deposits in the Garonne valley. These new data are compared to the previous ones. A set of 17 tree trunks and more than 300 smaller wood fragments were collected. The xylologic study shows the prevalence of Quercus and a single occurrence of Ulmus. These two hardwood species are commonly associated with riparian forest. The 14C dating carried out on seven trunks and a single branch of Quercus on the outermost identified growth rings, indicates age ranging from 8400-8000 cal. BP for the oldest fragment (bough) to 4300-4000 cal. BP for the most recent tree trunk. Radiocarbon ages of the trunks are aggregated into two main periods: 5300-5600 cal. BP (four trunks) and 4300-4000 cal. BP (three trunks). The radiocarbon (charcoal) dating of the top of the alluvial sequence overlaying the trunks gives an age between 1965-1820 and 1570-1810 cal. BP, i.e. between the 2nd and the 5th c. AD. In addition, the discovery of two unpublished subfossil tree trunks deposits in Finhan are reported (six trunks). At the light of these results, we discuss previously proposed models for the Garonne floodplain building.
Domaines
GéographieFormat du dépôt | Fichier |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
The subfossil tree deposits from the Garonne Valley and their implications on Holocene alluvial plain dynamics
|
Résumé |
en
Subfossil tree trunks deposits are common in large rivers, but their status as a source for dating alluvial sequences and palaeoenvironmental studies is still discussed. Particularly their origin and the process(es) of deposition as well as a possible remobilization were pointed as a limit to their use to document river alluvial changes. In this work we report the discovery of the largest subfossil trunks deposits in the Garonne valley. These new data are compared to the previous ones. A set of 17 tree trunks and more than 300 smaller wood fragments were collected. The xylologic study shows the prevalence of Quercus and a single occurrence of Ulmus. These two hardwood species are commonly associated with riparian forest. The 14C dating carried out on seven trunks and a single branch of Quercus on the outermost identified growth rings, indicates age ranging from 8400-8000 cal. BP for the oldest fragment (bough) to 4300-4000 cal. BP for the most recent tree trunk. Radiocarbon ages of the trunks are aggregated into two main periods: 5300-5600 cal. BP (four trunks) and 4300-4000 cal. BP (three trunks). The radiocarbon (charcoal) dating of the top of the alluvial sequence overlaying the trunks gives an age between 1965-1820 and 1570-1810 cal. BP, i.e. between the 2nd and the 5th c. AD. In addition, the discovery of two unpublished subfossil tree trunks deposits in Finhan are reported (six trunks). At the light of these results, we discuss previously proposed models for the Garonne floodplain building.
|
Auteur(s) |
Jean-Michel Carozza
1
, Laurent Carozza
1
, Philippe Valette
1
, Muriel Llubes
2
, Vanessa Py
1
, Didier Galop
1
, Mihaela Danu
3
, Laurie Ferdinand
1
, Mélodie David
1
, Laurent Sévègnes
4
, Laurent Bruxelles
5
, Marc Jarry
5, 6
, Francis Duranthon
7
1
GEODE -
Géographie de l'environnement
( 742 )
- 5 Allée Antonio Machado 31058 TOULOUSE CEDEX 1
- France
2
GET -
Géosciences Environnement Toulouse
( 151875 )
- Observatoire Midi-Pyrénées 14 Avenue Edouard Belin 31400 Toulouse
- France
3
Université de Iasi
( 396965 )
-
- France
4
SRA -
Service Régional de l'Archéologie
( 240969 )
- 32 rue de la Dalbade, FR-31000 TOULOUSE
- France
5
Inrap -
Institut national de recherches archéologiques préventives
( 301475 )
- 121 rue d'Alésia
75014 Paris
- France
6
TRACES -
Travaux et recherches archéologiques sur les cultures, les espaces et les sociétés
( 44675 )
- Maison de la Recherche, 5 allée Antonio Machado 31058 TOULOUSE Cedex 9
- France
7
AMIS -
Anthropologie Moléculaire et Imagerie de Synthèse
( 445683 )
- 37 Allées Jules Guesde
31073 Toulouse
- France
|
Page/Identifiant |
8
|
Nom de la revue |
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Date de publication |
2014
|
Langue du document |
Anglais
|
Domaine(s) |
|
Mots-clés |
en
Subfossil trunk, France, Alluvial plain, Holocene, Garonne, Black oak
|
Origine :
Accord explicite pour ce dépôt
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