Deglaciation and volcano-seismic activity in Northern Iceland : Holocene and Early Eemian
(Geodinamica Acta. vol. 18 (1), n° 0985-3111, pp. 81-100, 22/02/2026)
PBDS, INSU - CNRS, CNRS, LPGN, UN, CNRS, GR, UR, INSU - CNRS, CNRS, MNHN, UPMC, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, PALEOCEAN, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA
Live foraminiferal faunas from a 2800 m deep lower canyon station from the Bay of Biscay : Faunal response to focusing of refractory organic matter
(Deep Sea Research. vol. 52, n° 0146-6291, pp. 1189-1227, 22/02/2026)
UA, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, LOBB, OOB, UPMC, CNRS, UPMC, INSU - CNRS, CNRS
Live foraminiferal faunas from a 2800 m deep lower canyon station from the Bay of Biscay: Faunal response to focusing of refractory organic matter
A 2800 m deep station was sampled on three occasions, in January 1999, June 1999 and April 2000, in the lower part of Cap-Ferret Canyon (Bay of Biscay). This area is characterised by a rapid accumulation of fine-grained sediments and by important inputs of reworked organic matter in an intermediate state of decay. Diagenetic reactions within the sediment follow the well-established depth sequence resulting from the oxidation of organic deposits by different electron acceptors. At our station, live benthic foraminiferal faunas differ strongly from faunas previously collected at nearby open slope sites at a comparable water depth. Spectacularly high densities of deep infaunal species are observed in the deeper parts of the sediment for all three sampling periods. In our opinion, these high deep infaunal densities are a direct response to the massive flux of partially degraded organic matter, which is slowly introduced into the deeper parts of the sediment, where it induces a rather stable succession of redox gradients. Melonis barleeanus lives in the dysoxic part of the sediment whereas Globobulimina affinis appears preferentially close to the zero oxygen boundary. Both taxa occupy niches where the highest content of Mn (III, IV)-oxides and -oxihydroxides and Fe (III)-oxides are recorded. The fact that most of the geochemical reactions within the sediment are directly or indirectly catalysed by heterotrophic and chemolithoautotrophic bacterial consortia could suggest that deep infaunal foraminifera may be highly specialised protozoans able to feed on, or live in symbiosis with these prokaryotic communities.
(Deep Sea Research Part I: Oceanographic Research Papers. vol. 52, n° 0967-0637, pp. 1189-1227, 22/02/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, LOMIC, OOB, UPMC, CNRS, UPMC, CNRS
Axial incision: The key to understand submarine canyon evolution (in the western Gulf of Lion)
A detailed morphological analysis of the outer shelf and continental slope of the Western Gulf of Lion is presented, based on swath bathymetry data together with sub-bottom profiles and high resolution seismic reflection profiles. These data reveal two main erosive features, of very different dimensions: the axial incision and the canyon's major valley. The height of axial incisions' flanks with respect to the canyon deepest point (the thalweg) ranges from 40 to 150 m. It creates a small axial erosive path within the canyon's major valley, which is typically bounded by flanks of more than 700 m in height. We interpret the axial incision observed in the sea floor as the imprint of turbidity currents that eroded the floor of canyons during phases of connection to rivers (hyperpycnal turbidity current). Such currents are most likely to have formed during the Last Glacial Maximum (LGM) as both proximity of the shoreline (due to the lowstand of sea level) and high detrital sediment supply (due to glacial abrasion upstream) increased the flow of sediments delivered to the canyon heads. Fossil axial incisions, observed in seismic lines, are related to equivalent conditions. The axial incision, however, has a key influence on canyon evolution as it triggers mass wasting of different sizes that affect the canyon's major valley (head and flanks). We interpret the geometry of the canyon's major valley as the result of recurrent activity of axial incisions. These periods of activity occurred during low sea levels at glacial maxima and show a cyclicity of 100,000 years for the last 400,000 years.
(Marine and Petroleum Geology. vol. 22 (6-7), n° 0264-8172, pp. 805-826, 22/02/2026)
LDO, INSU - CNRS, UBO EPE, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Paleoseismic inferences from a high-resolution marine sedimentary record in northern Chile (23°S) .
The active margin of northern Chile is characterized by strong seismic events which induce gravity instability for sedimentary sequences located along the outer forearc of the Andean range. Even though the narrow continental platform of this area limits the accumulation of marine sediments, a detailed paleoceanographic reconstruction, using high-resolution sedimentological and geochronological techniques, of a Holocene sedimentary sequence in Mejillones bay (23°S) provides important tools to infer the occurrence of past great subduction earthquakes and/or associated tsunamis. From the analyses of short cores retrieved in this shallow marine basin, we infer the occurrence of two strong seismic events during historical times. The first one, dated between the years 1409 and 1449 AD, produced an angular unconformity and associated lenticular coarse-grained deposits generated after local reworking of shallower material. The second one, dated between the years 1754 and 1789 AD, caused slumping, erosive processes and local reworking of material. The analysis of seismic profile data acquired in this bay allowed the recognition of a major slump deposit within the upper sedimentary sequence, tentatively dated as of Middle Holocene age. This event might record the greatest earthquake (and tsunami) affecting the basin within the last few thousand years. We interpret that destabilization of sediments occurs most probably in response to local reactivation of faults within the Mejillones peninsula during strong earthquakes, especially the Mejillones fault.
(Tectonophysics. vol. 399, n° 0040-1951, pp. 381-398, 22/02/2026)
FCFM, UCHILE, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, PALEOTROPIQUE, ISTO, INSU - CNRS, UO, CNRS, SERNAGEOMIN
Evidence of a major environmental change recorded in a macrotidal bay (Marennes-Oléron Bay, France) by correlation between VHR seismic profiles and cores
New, very high-resolution (25 cm) seismic profiles have revealed the internal architecture of the infilling of a macrotidal bay, the Marennes-Oléron Bay, France. Within this geometry, a major seismic unconformity has been correlated with core data. This correlation provides evidence that the seismic unconformity corresponds to a sharp grain-size decrease. Both seismic and core data indicate that this change of grain size can be interpreted as a record of a recent (around 1,000 years b.p.) decrease in hydrodynamical energy with time and/or a larger supply of fine-grained material. This recent environmental change can be related to natural infilling of the Marennes Oléron Bay, and to tidal prism decrease, increasing human activities (e.g. land reclamation, deforestation, agricultural land use) and climate fluctuations during the late Holocene, such as the transition between the cold period of the Dark Ages (1,550–1,050 years b.p.) and the Medieval warm period (1,050–550 years b.p.).
(Geomarine letters. vol. 1, pp. 1-10, 22/02/2026)
M2C, UNICAEN, NU, INSU - CNRS, UNIROUEN, NU, CNRS, CLDG, ULR, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Résolution numérique en volumes finis d'un système d'équations de Serre étendu
Un schéma de résolution numérique en volumes finis pour un système d'équations de Serre étendu est présenté. En utilisant des solutions analytiques tests nous montrons que celui-cifournit une erreur de discrétisation globale de {O[(Δx)4], O[(Δt)4]}. Le traitement numérique des conditions aux limites de trait de côte mobile et d'absorption-génération d'ondes au large doit permettre d'aborder l'étude de la propagation de la houle sur une plage. La comparaison des résultats numériques avec des mesures expérimentales de propagation d'ondes solitaires sur une plage confirme la capacité des équations de Serre à reproduire les non-linéarités associées au raidissement des ondes dans la zone de levée et l'amplitude limite de celles-ci.
(Revue Européenne de Génie Civil. vol. 9, n° 1774-7120, pp. 889-902, 22/02/2026)
LEGI, UJF, Grenoble INP, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Turbulence in the surf zone using two acoustic Doppler velocimeters
(22/02/2026)
LEGI, UJF, Grenoble INP, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Spatio-temporal changes in totally and enzymatically hydrolyzable amino acids of superficial sediments from three contrasted areas
(Progress in Oceanography. vol. 65, n° 0079-6611, pp. 89-111, 22/02/2026)
LOBB, OOB, UPMC, CNRS, UPMC, INSU - CNRS, CNRS, IMARPE, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, LGE, UPD7, IPG Paris
Étude pluridisciplinaire des mécanismes de contamination des hydrosystèmes continentaux et des zones rivulaires par les métaux (Cd, Zn)
Ce projet recherche du programme ACI-ECCO repose sur une étude pluridisciplinaire des mécanismes de contamination des hydrosystèmes continentaux (cours d'eau et zones rivulaires associées). Dans ce qui suit, nous rapporterons des résultats acquis sur une analyse des flux métalliques du bassin expérimental de Decazeville, sur les premières caractérisations de la spéciation chimique des métaux, de leur biodisponibilité et des impacts toxiques sur la composante biologique des hydrosystèmes. Au terme de cette étude, l'intégration des résultats permettra d'améliorer les connaissances sur les relations entre Écodynamique des métaux-traces et Écotoxicologie et de promouvoir de nouvelles méthodes d'investigation, associant des outils complémentaires à l'interface « Chimie/Géochimie/ Biologie/Écologie/Écotoxicologie ».
(pp. 8, 22/02/2026)
IPGQ, UB, CNRS, LPTC, UB, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, UR REBX, CEMAGREF, LEH, UT3, Comue de Toulouse, CNRS, LMTG, UT3, Comue de Toulouse, CNRS, TCEM, INRA, ENITAB, UMR LSTM, Cirad, UM1, IRD, INRA, UM2, UM, Montpellier SupAgro, LCABIE, UPPA, CNRS