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Changements côtiers holocènes le long de l’estuaire de la Gironde : nouvelles données à partir du système plage/dune de la péninsule du nord‑Médoc
hal.structure.identifier | Littoral, Environnement, Télédétection, Géomatique UMR 6554 [LETG] | |
dc.contributor.author | STÉPHAN, Pierre | |
hal.structure.identifier | Ausonius-Institut de recherche sur l'Antiquité et le Moyen âge | |
dc.contributor.author | VERDIN, Florence | |
hal.structure.identifier | Pôle de recherche pour l'organisation et la diffusion de l'information géographique [PRODIG (UMR_8586 / UMR_D_215 / UM_115)] | |
dc.contributor.author | ARNAUD-FASSETTA, Gilles | |
hal.structure.identifier | Pôle de recherche pour l'organisation et la diffusion de l'information géographique [PRODIG] | |
dc.contributor.author | BERTRAND, Frédéric | |
hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
dc.contributor.author | EYNAUD, Frédérique | |
hal.structure.identifier | Universidad del Pais Vasco / Euskal Herriko Unibertsitatea [Espagne] [UPV/EHU] | |
dc.contributor.author | GARCÍA-ARTOLA, Ane | |
hal.structure.identifier | De la Préhistoire à l'Actuel : Culture, Environnement et Anthropologie [PACEA] | |
dc.contributor.author | BOSQ, Mathieu | |
hal.structure.identifier | Pôle de recherche pour l'organisation et la diffusion de l'information géographique [PRODIG (UMR_8586 / UMR_D_215 / UM_115)] | |
dc.contributor.author | CULIOLI, Camille | |
hal.structure.identifier | Littoral, Environnement, Télédétection, Géomatique [LETG - Brest] | |
dc.contributor.author | SUANEZ, Serge | |
hal.structure.identifier | Ausonius-Institut de recherche sur l'Antiquité et le Moyen âge | |
dc.contributor.author | COUTELIER, Clément | |
hal.structure.identifier | De la Préhistoire à l'Actuel : Culture, Environnement et Anthropologie [PACEA] | |
hal.structure.identifier | Institut national de recherches archéologiques préventives [Inrap] | |
dc.contributor.author | BERTRAN, Pascal | |
hal.structure.identifier | Littoral, Environnement, Télédétection, Géomatique [LETG - Caen] | |
dc.contributor.author | COSTA, Stéphane | |
dc.date.created | 2017 | |
dc.date.issued | 2019 | |
dc.identifier.issn | 1142-2904 | |
dc.description.abstract | L’Amélie beach is located near the mouth of the Gironde estuary (south-western Atlantic coast of France). It has been greatly eroded by recent storms, especially in the winter of 2013-2014. Erosion of the dune front and beach has uncovered a set of estuarine and aeolian sediment deposits containing numerous archaeological remains. A campaign of topographic surveys was undertaken with DGPS and TLS equipment during the springs of 2014 and 2015 along the 2 km length of L’Amélie beach in order to reconstruct the elevation and stratigraphy of these deposits. Sedimentological analyses (grain size, micro-faunal) were performed to better constrain the depositional environment. Archaeological remains and several radiocarbon dates obtained from sediment samples collected in the field were used to propose a consistent chronological framework for this sedimentary sequence. Ten main lithofacies were distinguished from the lower part of the beach to the top of the dune. The base of the sedimentary sequence is composed of Pleistocene deposits dating from MIS 9 (unit 1a) to MIS 2 (unit 1b) (Bosq et al., 2019). The Holocene sedimentary infilling began around 5000 BC with an accumulation of coarse marine sands, which suggests the presence of a tidal inlet. On both sides of this tidal channel, archaeological remains dating from the early Neolithic period up to the Bronze Age testify to a human occupation of the coastal area. From ca. 5000 to ca. 3500 cal. a BP, a characteristic deposit of intertidal mudflats indicates the transformation of the tidal inlet into estuarine marshes protected by a coastal dune barrier. Between ca. 3500 and ca. 3000 cal. a BP, the dune barrier records a phase of erosion resulting in the exposure of the marsh to stronger hydrodynamic conditions. From ca. 2800 to 1650 cal. a BP, a second phase of estuarine sedimentation is recognized. This period is characterized by significant human occupation as indicated by the presence of numerous archaeological remains of the Iron Age and Gallo-Roman periods, associated with the exploitation of a saltwater-to-brackish environment. From 1650 to 1250 cal. a BP, the estuarine salt marsh is gradually overrun by northward migrating coastal-dune fields. After 1250 cal. a BP, the marsh is completely covered by aeolian sands. These results are consistent with previously published data and allow us to detail the local sequence of palaeogeographic changes of the north-Médoc peninsula. Using the ‘sea-level index points’ method (Hijma et al., 2015), the analysis of radiocarbon dated levels also provides new relative sea level records for this part of the French Atlantic coast. Finally, the phases of coastal dune activity/stability recognized along L’Amélie beach are synchronous with those in the wider Aquitaine coastal region, suggesting a regional driving factor. We propose that the shared sedimentary dynamics are the consequence of the onshore migration of intertidal and subtidal sand banks distributed at the mouth of the Gironde. | |
dc.description.abstractEn | L’Amélie beach is located near the mouth of the Gironde estuary (south-western Atlantic coast of France). It has been greatly eroded by recent storms, especially in the winter of 2013-2014. Erosion of the dune front and beach has uncovered a set of estuarine and aeolian sediment deposits containing numerous archaeological remains. A campaign of topographic surveys was undertaken with DGPS and TLS equipment during the springs of 2014 and 2015 along the 2 km length of L’Amélie beach in order to reconstruct the elevation and stratigraphy of these deposits. Sedimentological analyses (grain size, micro-faunal) were performed to better constrain the depositional environment. Archaeological remains and several radiocarbon dates obtained from sediment samples collected in the field were used to propose a consistent chronological framework for this sedimentary sequence. Ten main lithofacies were distinguished from the lower part of the beach to the top of the dune. The base of the sedimentary sequence is composed of Pleistocene deposits dating from MIS 9 (unit 1a) to MIS 2 (unit 1b) (Bosq et al., 2019). The Holocene sedimentary infilling began around 5000 BC with an accumulation of coarse marine sands, which suggests the presence of a tidal inlet. On both sides of this tidal channel, archaeological remains dating from the early Neolithic period up to the Bronze Age testify to a human occupation of the coastal area. From ca. 5000 to ca. 3500 cal. a BP, a characteristic deposit of intertidal mudflats indicates the transformation of the tidal inlet into estuarine marshes protected by a coastal dune barrier. Between ca. 3500 and ca. 3000 cal. a BP, the dune barrier records a phase of erosion resulting in the exposure of the marsh to stronger hydrodynamic conditions. From ca. 2800 to 1650 cal. a BP, a second phase of estuarine sedimentation is recognized. This period is characterized by significant human occupation as indicated by the presence of numerous archaeological remains of the Iron Age and Gallo-Roman periods, associated with the exploitation of a saltwater-to-brackish environment. From 1650 to 1250 cal. a BP, the estuarine salt marsh is gradually overrun by northward migrating coastal-dune fields. After 1250 cal. a BP, the marsh is completely covered by aeolian sands. These results are consistent with previously published data and allow us to detail the local sequence of palaeogeographic changes of the north-Médoc peninsula. Using the ‘sea-level index points’ method (Hijma et al., 2015), the analysis of radiocarbon dated levels also provides new relative sea level records for this part of the French Atlantic coast. Finally, the phases of coastal dune activity/stability recognized along L’Amélie beach are synchronous with those in the wider Aquitaine coastal region, suggesting a regional driving factor. We propose that the shared sedimentary dynamics are the consequence of the onshore migration of intertidal and subtidal sand banks distributed at the mouth of the Gironde. | |
dc.description.sponsorship | Using the world in ancient societies : processes and forms of appropriation of space in Long Time - ANR-10-LABX-0052 | |
dc.description.sponsorship | Initiative d'excellence de l'Université de Bordeaux | |
dc.language.iso | en | |
dc.publisher | AFEQ-CNF INQUA | |
dc.rights.uri | http://hal.archives-ouvertes.fr/licences/copyright/ | |
dc.subject | dune | |
dc.subject | estuaire | |
dc.subject | vasière | |
dc.subject | marais maritimes | |
dc.subject | Holocène | |
dc.subject | hausse du niveau marin | |
dc.subject | ensablement éolien | |
dc.subject | TLS | |
dc.subject | Gironde | |
dc.subject | Aquitaine | |
dc.subject.en | Aquitaine | |
dc.subject.en | Gironde | |
dc.subject.en | TLS | |
dc.subject.en | aeolian sand drift | |
dc.subject.en | sea-level rise | |
dc.subject.en | salt marsh | |
dc.subject.en | mudflat | |
dc.subject.en | dune | |
dc.subject.en | estuary | |
dc.subject.en | Holocene | |
dc.title | Changements côtiers holocènes le long de l’estuaire de la Gironde : nouvelles données à partir du système plage/dune de la péninsule du nord‑Médoc | |
dc.title.en | Holocene coastal changes along the Gironde estuary (SW France): new insights from the North Médoc peninsula beach/dune system | |
dc.type | Article de revue | |
dc.identifier.doi | 10.4000/quaternaire.11172 | |
dc.subject.hal | Sciences de l'Homme et Société/Archéologie et Préhistoire | |
bordeaux.journal | Quaternaire | |
bordeaux.page | 47-75 | |
bordeaux.volume | 30 | |
bordeaux.issue | 1 | |
bordeaux.peerReviewed | oui | |
hal.identifier | hal-02834346 | |
hal.version | 1 | |
hal.popular | non | |
hal.audience | Internationale | |
hal.origin.link | https://hal.archives-ouvertes.fr//hal-02834346v1 | |
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