Cécile Miramont

Cécile Miramont
Aix-Marseille Université | AMU · Institut Méditerranéen de Biodiversité et d'Ecologie marine et continentale (UMR 7263 IMBE)

About

83
Publications
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Additional affiliations
January 1998 - present
Aix-Marseille Université
Position
  • Professor (Assistant)

Publications

Publications (83)
Article
This paper presents the first Lateglacial/Holocene (the last 13 500 cal a BP) ostracod δ18O record to infer hydroclimate variability in the Southern French Alps. Cytherissa lacustris (δ18Osp) shells extracted from the sediments of Lake Allos allowed a reconstruction of δ18Olake water (δ18Olw) except for the interval 5800–2800 cal a BP. The shape of...
Article
A suite of limnological proxies measured in clastic sediments of the glacier-fed Lake Ala Kol (NE Kyrgyzstan) document palaeoenvironmental change and glacier fluctuations in the central Tien Shan over the last millennium. Rock magnetic and geochemical data provide supporting evidence for three glacier expansion episodes occurring in 1200–1400 CE, 1...
Article
Subfossil trees with their annual rings constitute the most accurate and precise archive to calibrate the radiocarbon ( ¹⁴ C) method. The Holocene part of the IntCal curve is based on tree-ring chronologies, absolutely dated by dendrochronological matching. For the Northern Hemisphere, the absolute curve starts at 12,325 cal BP. For the early part...
Article
Full-text available
In the Mediterranean area, the 4.2 ka BP event is recorded with contrasting expressions between regions. In the southern Alps, the high-altitude Lake Petit (Mercantour Massif, France; 2200 m a.s.l.) offers pollen and diatom-rich sediments covering the last 4800 years. A multi-proxy analysis recently revealed a detrital pulse around 4200 cal BP due...
Article
Full-text available
Nearly 13,000 years ago, the warming trend into the Holocene was sharply interrupted by a reversal to near glacial conditions. Climatic causes and ecological consequences of the Younger Dryas (YD) have been extensively studied, however proxy archives from the Mediterranean basin capturing this period are scarce and do not provide annual resolution....
Article
Full-text available
The 4.2kyrs event, used as a marker of holocene stratigraphy, has been described as a rapid climate change in the northern hemisphere triggering droughts in the Mediterranean region. However, the severity and geographical extent of this event are still the subject of investigation considering the small number of palaeoclimatic records for this time...
Article
The AixMICADAS facility is in part dedicated to research on radiocarbon ( ¹⁴ C) calibration by means of various archives. For this purpose, we are improving upon the capacity to accurately date subfossil wood. In the current study, nine chemical pretreatment protocols are tested on six wood samples of known ages. The optimization based on ¹⁴ C ages...
Article
Full-text available
Understanding the role of climate and humans in generating mountain slope instability is crucial because such instability influences downstream fluvial activity and is a major threat to societies. Here, we use the sedimentary archive of Lake Allos (southeastern France), a mountain lake in the European Alps, to characterize mountain flood deposits a...
Article
Understanding topographic evolution requires integrating elementary processes acting at the hillslope scale into the long-wavelength framework of landscape dynamics. Recent progress has been made in the quantification of denudation of eroding landscapes and its links with topography. Despite these advances, data is still sparse in carbonate terrain...
Conference Paper
La variabilité holocène des crues torrentielles en montagne : un éclairage donné par l'étude micro-sédimentologique et pollinique des sédiments du lac d'Allos (2200 m, Alpes du Sud) Le comptage des dépôts minérogéniques et granulo-décroissants (dépôts de crue) sur lame-mince de sédiment induré réalisé sur l'archive sédimentaire du lac d'Allos (2200...
Article
Full-text available
Sediments from Lake Petit (2200 m a.s.l., Southern Alps) are particularly relevant for analysis of coupled landscape palaeoecology and palaeolimnology. Diatom assemblages, organic matter composition of sediments (total nitrogen and organic carbon) and Pediastrum boryanum concentrations were obtained from a 144-cm-long core, enabling the reconstruct...
Conference Paper
Full-text available
Understanding landscape evolution, under the combined influence of denudation and tectonic uplift, require the derivation of quantitative models and descriptions of the processes at work, which is one of the main objectives of quantitative geomorphology. The use of cosmogenic nuclides as chronometers pegged to surface processes has fostered tremend...
Article
Full-text available
This study investigates sediment cores from the Mediterranean alpine lakes located in upvalley cirques upper than 1700 metres a.s.l. using sedimentological, palynological and geomorphological studies, in order to document environmental changes following the last phase of glacier retreat. These results are considered in the framework of the deglacia...
Article
Full-text available
Holocene glacier records from the western European Alps are still sparse, although a number of sites are well suited to constraining pre-and early-Little Ice Age (LIA) glacier advances. The present study provides the first dendrochronologically-based and calendar-dated Neoglacial glacier chronology for the Mont Blanc massif, French Alps. It is base...
Article
Full-text available
This study presents new 14C AMS ages obtained from the sedimentary sequence of Lake Allos (elevation: 2,230 m, Verdon valley, Southern Alps, France). These ages provide new evidence on the last deglaciation over the Southern Alps, enabling us to revise the chronological framework previously established. Sedimentation in the lake began between 12,30...
Article
Full-text available
By the importance and diversity of its Quaternary sedimentary formations, the southern piedmont of the Grand Luberon is a laboratory for both Pleistocene and Postglacial landscape mutations in the Mediterranean area. The presence of pedogenic horizons in the Upper Pleistocene cryoclastic formations signs the impact of the different temperate inters...
Article
This study presents new 14C AMS ages obtained from the sedimentary sequence of Lake Allos (elevation: 2,230 m, Verdon valley, Southern Alps, France). These ages provide new evidence on the last deglaciation over the Southern Alps, enabling us to revise the chronological framework previously established. Sedimentation in the lake began between 12,30...
Article
Full-text available
By the importance and diversity of its Quaternary sedimentary formations, the southern piedmont of the Grand Luberon is a laboratory for both Pleistocene and Postglacial landscape mutations in the Mediterranean area. The presence of pedogenic horizons in the Upper Pleistocene cryoclastic formations signs the impact of the different temperate inters...
Article
Full-text available
Abstract Changes in sediment budget and quantification of sediment fluxes of a small (5.3 km2) Mediterranean sub-Alpine river catchment (Charanc catchment, Southern French Alps, 44°30′44N/5°51′55E) are estimated for the last 20,000 years using a GIS-based approach and 3D palaeotopographic reconstructions. Following field surveys, a high-resolution...
Article
Full-text available
Par l’importance et la diversité des formations sédimentaires quaternaires qui le composent, le piémont méridional du Grand Luberon est un véritable laboratoire des mutations paysagères pléistocènes et postglaciaires en domaine méditerranéen. La présence d’horizons pédogénétiques dans les glacis à gélifracts du Pléistocène supérieur signe l’impact...
Article
Full-text available
A 144 cm-long core was obtained in Lake Petit (2200 m a.s.l., Mediterranean French Alps) in order to reconstruct past interactions between humans, the environment and the climate over the last five millennia using a multidisciplinary approach involving sedimentological, geochemical and botanical analyses. We show a complex pattern of environmental...
Poster
Full-text available
We present GIS-based quantification of stream catchment sediment budgets in a high-energy subAlpine setting in south-eastern France characterized by markedly different phases of deposition, stream incision, erosion and downstream sediment export. GPS-assisted field investigations were conducted in order to map accurately the geomorphology of the Ch...
Article
Le lac d'Allos (2200 m d'altitude) est situé dans une vallée héritée du surcreusement des glaciers dans les Alpes françaises du Sud. Le carottage réalisé en 2011 a permis d'extraire l'ensemble du remplissage postglaciaire (15 mètres de dépôts). Une approche multiproxy haute résolution (sédimentologie, géochimie, palynologie) est en cours et support...
Article
Full-text available
High resolution multiproxy analyses, including sedimentological, geochemical and palynological investigations, were carried out on a 144-cm-long sediment profile from Lake Petit (2200 m a.s.l., Vallon des Millefonts, Mercantour, in the French Southem Alps). This allowed us to reconstruct complex interactions between climate, environment and human d...
Article
Full-text available
L’analyse multiproxies à haute résolution d’une séquence sédimentaire prélevée dans le Lac Petit (alt. 2 200 m, vallon des Millefonts, Mercantour, France) a permis d’étudier les interactions climat-environnement-Homme à l’Holocène récent en contexte de haute montagne dans les Alpes du Sud. Grâce aux analyses lithostratigraphiques, géochimiques et p...
Book
L’évolution des paysages face aux changements climatiques depuis la dernière glaciation dans les Alpes du Sud (Moyenne Durance, Alpes-Maritimes). Quels impacts sur les sociétés ?
Article
Full-text available
Radiocarbon time scale calibration is based on dated absolute chronologies. River bank incision in the Barbiers River (Moyenne Durance, Southern French Alps) reveals numerous lateglacial subfossil Scots pines. Trunks are dated at the end of the Allcröd and the beginning of Younger Dryas. Dendrochronological analyses allow building two floating mean...
Conference Paper
Numerous archaeological studies carried out in high-elevation areas of the Southern French Alps have documented ancient human occupation of mountains, mainly characterized by pastoral and mining activities. Besides, the area was affected by both continental and Mediterranean climate instability throughout the Holocene. Lake Petit, located in the Me...
Article
La séquence sédimentaire du lac Petit (Vallon des Millefonts, massif du Mercantour, France) a fourni un enregistrement sédimentaire et pollinique en continu sur les 5 derniers millénaires. Ce lac de surcreusement glaciaire (2200 m d'altitude) agit comme un piège naturel à sédiment et nous a permis d'étudier les différentes composantes paléoenvironn...
Article
The Roman and early medieval Richeaume XIII necropolis in Provence (France) was systematically studied using magnetic prospection and electrical resistivity tomography (ERT). Remains of a limestone-made building are embedded in a reddish clay formation bearing iron oxides. This produces an interesting negative magnetic anomaly, whereas the wall its...
Article
Mediterranean mountains are very sensitive geosystems to erosion processes. These environments combine three steep gradients: topographic, ecologic and climatic. They are extremely vulnerable to both anthropogenic and climate-driven global changes. We propose a multiproxy approach from sediments sequence of Petit Lake (2200m, Millefonts catchment,...
Article
Full-text available
A 3D palaeotopographic modeling is proposed to quantify the sediment budget of a small subalpine catchment (5 km²) over the last postglacial period in Southern French Alps. Originality of these catchment formations is to hold many charcoal beds and subfossil trees which allow radiocarbon dating. Therefore, this basin provides a well-constrained seq...
Article
Here we present the entire range of Lateglacial tree-ring chronologies from Switzerland, Germany, France, covering the Lateglacial north and west of the Alps without interruption as well as finds from northern Italy, complemented by a 14C data set of the Swiss chronologies. Geographical expansion of cross-matched European Lateglacial chronologies,...
Article
Actes du colloque "Panorama de la dendrochronologie en France", octobre 2009, Digne les Bains. Ce nouveau numéro de la Collection Edytem accueille les contributions du colloque qui s'est déroulé, il y a moins d'un an, à Digne-les-Bains, autour de la dendrochronologie en France. Les différents textes de ce numéro et leur articulation en cinq grands...
Article
Full-text available
La dendroglaciologie est l'un des champs de la dendrochronologie qui s'applique à la reconstitution des fluctuations glaciaires en analysant le signal climatique et/ou géomorphologique contenu dans les cernes de croissance des arbres. Son utilisation est deve­nue courante aujourd'hui pour dater les récurrences glaciaires dans les régions où les gla...
Article
Full-text available
The small tributaries rivers of the southern French Prealps are characterised by the presence of thick Holocene infill in which are buried numerous levels of subfossil trunks. Dendrogeomorphologic and sedimento-stratigraphic approachs are used to study of the late glacial and Holocene deposits in the Drouzet basin. We point out the spatio-temporal...
Article
The small tributaries rivers of the southern French Prealps are characterised by the presence of thick Holocene infill in which are buried numerous levels of subfossil trunks. Dendrogeomorphologic and sedimento-stratigraphic approachs are used to study of the late glacial and Holocene deposits in the Drouzet basin. We point out the spatio-temporal...
Article
Full-text available
Les datations radiocarbone d’une vingtaine de coupes naturelles dans les petits organismes torrentiels des Alpes du Sud mettent clairement en évidence une bi-partition dans l’évolution de la morphogenèse de la période 14 500 cal BP à aujourd’hui. De 14 500 à 7000 cal BP une sédimentation importante caractérise les zones de piémont. Les taux de sédi...
Article
Full-text available
Aim Previous studies have failed to reconstruct the regional post-glacial migration pattern of Abies alba in southern France. Based on the first exhaustive compilation of palaeoecological data in this region, we present the state-of-the-art and attempt to synthesize the available information concerning glacial refugia and post-glacial migration, an...
Article
Full-text available
Geomorphological and paleo-environmental research carried out in the still poorly known sector of the Grand Luberon (southern Vaucluse) has shown in recent years the extent and the importance of sedimentary, paleo-ecological, and archeological records available for the study of the entire sedimentary control mechanism that is present (detritics or...
Article
Full-text available
L'objectif de cet article est de dresser un bilan des travaux menes depuis une trentaine d'annees dans les Alpes du Sud sur l'evolution geomorphologique et paleoenvironnementale postglaciaire. Initiees par M. Jorda dans les annees 1980, ces recherches ont porte sur la definition des grandes etapes de la sedimentation postglaciaire et sur la mise en...