A5053454990- Geology and Paleoclimatology Research
- Geological formations and processes
- Geological and Geophysical Studies Worldwide
- Climate change and permafrost
- Pleistocene-Era Hominins and Archaeology
- Aeolian processes and effects
- Geological and Geochemical Analysis
- Methane Hydrates and Related Phenomena
- Paleontology and Stratigraphy of Fossils
- Cryospheric studies and observations
- earthquake and tectonic studies
- Maritime and Coastal Archaeology
- Coastal and Marine Dynamics
- Geological Formations and Processes Exploration
- Landslides and related hazards
- Marine and environmental studies
- Geological Modeling and Analysis
- Geological Studies and Exploration
- Soil erosion and sediment transport
- Soil and Unsaturated Flow
- Isotope Analysis in Ecology
- Archaeological and Historical Studies
- Hydrocarbon exploration and reservoir analysis
- Geochemistry and Geologic Mapping
- Archaeological and Geological Studies
Université de Bretagne Occidentale
2010-2024
Institut Universitaire Européen de la Mer
2013-2024
Centre National de la Recherche Scientifique
2010-2024
Geo-Ocean
2018-2021
Université Côte d'Azur
2021
Académie de Paris
2021
Université de Strasbourg
2021
Université de Montpellier
2021
Laboratoire d’Océanologie et de Géosciences
2018-2021
Océanopolis
2004-2018
Abstract This paper reviews and discusses the main mechanisms involved in cryoturbation processes patterned ground. The arguments are based upon field, thermal, moisture micromorphological data relation to cryogenic fabric stability local hydraulic conditions. Differential frost heaving appears be mechanism of cryoturbation, but its action can helped by cryostatic pressures, differential swelling probably also load casting poorly drained sites. emphasized if organics present....
Abstract In this paper, the authors present results of both macroscopic and microscopic investigations on structure development created by repeated ice lensing in various loamy experiments. Experimental data are compared with observations performed active forms High Arctic Alpine Mountain environments. Those also phenomena observed fossil periglacial formations Western Europe. Platy short prismatic formation is bonded to hydraulic thermal conditions during segregation. When a long series...
Numerous periglacial features (polygons, nets, soil stripes, ice‐wedge pseudomorphs and sand‐wedge casts, involutions) have been recorded in F rance by examining bibliographical sources aerial photographs. These data show that a large part of was affected permafrost during the P leistocene only southern A quitaine B asin L anguedoc seem to beyond its maximum extent. The first OSL ages obtained from aeolian infill wedge structures indicate at least two phases thermal contraction cracking...
Abstract Late Quaternary separation of Britain from mainland Europe is considered to be a consequence spillover large proglacial lake in the Southern North Sea basin. Lake inferred have caused breaching rock ridge at Dover Strait, although this hypothesis remains untested. Here we show that opening Strait involved least two major episodes erosion. Sub-bottom records reveal remarkable set sediment-infilled depressions are deeply incised into bedrock interpret as giant plunge pools. These...
Abstract Cryoturbation results mainly from differential heave related to (1) drainage and thermal conditions (2) frost susceptibility. Loadcasting cryostatic pressures are restricted wet soils such as pure silt or silty sand. The translocation of fine particles resulting repeated freezing thawing can promote susceptibility in a previously non‐susceptible material, well loss stability the surface horizons (liquefaction). Small metric scale cryoturbations be explained by this process. Large...
This study focuses on the recurring climate conditions required for largest storms occurring in NW France (Brittany). It is based analysed records of storm events along Western Brittany coast (see Part I). In this manuscript (Part II), recurrence explored with forcing mechanisms. Periods more frequent over two last centuries are first order to link these possible mechanisms (North Atlantic Oscillation (NAO) and Multidecadal (AMO) modes) triggering most destructive storms. Then, palaeostorm...
In order to reconstruct former sea‐levels and better characterize the history of H olocene salt‐marsh sedimentary infillings in W est B rittany (western F rance), local foraminifera‐based transfer functions were developed using weighted‐average‐partial‐least‐squares ( WAPLS ) regression, based on a modern data set 26 51 surface samples obtained from salt‐marshes bay T resseny Brest, respectively. Fifty cores retrieved resseny, P orzguen, roaon A run salt‐marshes, which litho‐...
Our study aims to understand the recurring climatic conditions prevailing during largest storms reaching NW France (Brittany). These are responsible for breaching of coastal barriers and major flooding lowlands. In a first part our work, we examine morphological impact stratigraphic record storm events along Western Brittany rocky coasts, with special focus on southern coast Bay Audierne, most exposed region. second paper (‘Middle- Late-Holocene Storminess in (NW France): Part II’), shall...
Abstract During eruptions onto low slopes, basaltic Pahoehoe lava can form thin lobes that progressively coalesce and inflate to many times their original thickness, due a steady injection of magma beneath brittle viscoelastic layers cooled develop sufficient strength retain the flow. Inflated flows forming tumuli pressure ridges have been reported in different kinds environments, such as at contemporary subaerial Hawaiian‐type volcanoes Hawaii, La Réunion Iceland, continental environments...
Abstract Southern Iceland is one of the main outlets Icelandic ice sheet and subject to seismicity both tectonic volcanic origins along South Seismic Zone (SISZ). A sedimentary complex spanning Marine Isotopic Stage 6 (MIS 6) present includes evidence activities. It a continuous record since Eemian interglacial period, controlled by rapid deglaciation, followed two marine glacioisostasy-forced transgressions, separated regression phase connected an intra-MIS 5e glacial advance. This has been...
Detailed investigations of peaty earth hummocks called pounus were carried out in northemmost Finnish Lapland the vicinity Kevo Subarctic Research Station. Pounus are complex, often vegetated, cryogenic mounds formed partly peat. Some have a core mineral soil or several large stones, just one frost-heaved boulder covered by They belong to same group as thufur and non-sorted circles. The typology is described compared with other types hummocks. Stratigraphical study shows how cryoturbation...