How does the Southern Ocean palaeoenvironment during Marine Isotope Stage 5e compare to the modern?
(Marine Micropaleontology. vol. 170, n° 0377-8398, pp. 102066, 01/01/2022)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Source-to-sink pathways of clay minerals in the cadiz contourite system over the last 25 kyrs: The segregational role of mediterranean outflow water
Despite major advances in our understanding of the interactions between bottom currents and sedimentary deposits over the last forty years, few studies have focused on the nature of fine particles in contourite depositional systems (CDS). XRD analyses of marine sediments can be used to improve our understanding of fine-grained sediment sources and settling processes. This work presents a detailed sedimentological study of sediment cores collected over the middle slope of the Gulf of Cadiz as part of Integrated Ocean Drilling Program Expedition 339 and the 2001 CADISAR cruise. We performed high-resolution clay mineral analyses to reconstruct the pathways of fine-grained particles from their sources to their deposition along the contourite depositional system of the Gulf of Cadiz (source-to-sink approach). The clay mineral associations reflect the major contribution of the Guadalquivir River and North African rivers/dusts to fine particles settling over the middle slope. Our
(Marine Geology. vol. 443, n° 0025-3227, pp. 106697, 01/01/2022)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, LOG, INSU - CNRS, ULCO, CNRS, IRD [Ile-de-France]
MOW strengthening and contourite development over two analog climate cycles (MIS 12–11 and MIS 2–1) in the Gulf of Cadíz: An impact on North Atlantic climate during deglaciation V and MIS 11?
(Global and Planetary Change. vol. 208, n° 0921-8181, pp. 103721, 01/01/2022)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Architectures 3D et hétérogénéités sédimentaires du réservoir géothermique argilo-sableux de l’Albien d’Île-de-France (Bassin de Paris)
La consommation énergétique en Ile-de-France est majoritairement associée aux besoins en chaleur des bâtiments, puis vient ensuite le secteur des transports. Plus de la moitié de la production de chaleur collective ou individuelle est produite par du combustible fossile. La stratégie énergie-climat de l’Ile-de-France prévoit d’augmenter assez significativement à l’horizon 2030 la production de chaleur par géothermie (x4 par rapport à 2015). Le rythme de développement actuel ne permettra pas d’atteindre cet objectif. Il faudrait atteindre un taux de 6 à 10 fois supérieur. Il devient nécessaire de positionner les doublets de manière optimale en proposant des solutions qui explorent le développement de nouvelles zones. Les réservoirs argilo-sableux du Crétacé inférieur deviennent une cible qu’il convient de mieux caractériser pour optimiser son développement. Récemment (2017) deux doublets géothermiques ont été mis en place dans la nappe de l’Albien sous le plateau de Saclay. Les retours d’expérience sur cette opération ont soulevé des problèmes de forte résistance à la réinjection, ne permettant pas un fonctionnement efficace et durable du système. L’hétérogénéité du réservoir en termes (1) de continuité ou d’épaisseur des niveaux sableux et/ou de niveaux argileux, (2) de minéralogie ou (3) de granulométrie est très peu documentée, ce qui complique son exploitation, et rend incertaine les opérations de ré-injection dans le réservoir. Il devient nécessaire de mieux caractériser ces hétérogénéités dans les réservoirs argilo-sableux du crétacé inférieur (Albien en particulier). Une base de données rassemblant les logs et données pétrophysiques de tous les puits d’Ile- de-France traversant les sables de l’Albien a été organisée sur le géomodelleur Petrel©. Deux cent quarante et un puits, avec diagraphies (avec au moins un Gamma Ray disponible) ou seulement carotté (forage d’Orsay), ont été sélectionnés dans un périmètre allant du nord de la Seine-Saint-Denis jusqu’au sud de l’Essonne et de la Seine et Marne. En incluant le forage carotté historique d’Orsay, ces puits ont été habillés en termes de faciès. Basé sur le rapport BRGM de 2016 (Sévenier et Lasseur, 2016), un ré-examen des faciès et séquences stratigraphiques a été réalisé d’après cette nouvelle base de données. L’étude détaillée permet de reconnaître 7 faciès. Ces faciès ont été attribués à un environnement de dépôt, estuariens à deltaïques en fonction des séquences avec (1) sables grossiers et graviers de la partie chenalisée et influencée par les marées, (2) argiles de replat de marée (mud flat), (3) sables propres de replat sableux (sand flat), (4) sables hétérolithiques de barres sableuses (heterolithic sand bars), (5) sables propres de shoreface, (6) sables argileux d’offshore supérieur et (7) argiles d’offshore inférieur. En tenant compte des concepts de stratigraphie séquentielle et d’empilement vertical des faciès, 3 séquences stratigraphiques de 2nd ordre ont été retrouvées. Douze Maximum Regressive Surfaces et treize Maximum Flooding Surfaces ont été reportées sur les puits et permettent d’illustrer 11 séquences de 3ème ordre, à l’aide de neuf coupes stratigraphiques de corrélation. Ces coupes permettent d’illustrer la géométrie du réservoir. A l’aide de méthodes géostatistiques, plusieurs réalisations numériques rendant compte de l’hétérogénéité 3D des facies ont été proposées. Elles permettent d’identifier les séquences et les localités propices au développement de ce réservoir. Le faciès de sable propre de shoreface de la 3ème séquence 4 et 5 rencontrées dans les Sables de Frécambault présentent une épaisseur d’une trentaine de mètres vers Orsay, et semble une cible idéale pour exploiter le réservoir sur ce site.
(. vol. 82, pp. 6, 15/10/2026)
GEOPS, INSU - CNRS, CNRS, IFPEN, BRGM, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Projet Seine-Aval 6 PHARESEE « Productivité microphytobenthique des HAbitats intertidaux en lien avec la dynamique sédimentaire, biogéochimique et les ingénieurs d'écosystème de la faune benthique : implication pour des enjeux de modélisation et de REhabilitation des vasières de la SEine Estuarienne »
(15/10/2026)
BOREA, UNICAEN, NU, MNHN, IRD, SU, CNRS, UA, UNICAEN, NU, Bioemco, ENS-PSL, PSL, IRD, INRA, UPMC, CNRS, ECOBIO, UR, INEE-CNRS, CNRS, CNRS, DYNECO, IFREMER, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, UGA UFRM, UGA, LIENSs, INSU - CNRS, ULR, CNRS, M2C, UNICAEN, NU, INSU - CNRS, UNIROUEN, NU, CNRS, iEES Paris, IRD, SU, UPEC UP12, CNRS, INRAE, IPG Paris, LOBB, OOB, UPMC, CNRS, UPMC, INSU - CNRS, CNRS, LEGI, CNRS, Fédération OSUG, UGA, Grenoble INP, UGA, IFREMER
The Reading Palaeofire Database: an expanded global resource to document changes in fire regimes from sedimentary charcoal records
Sedimentary charcoal records are widely used to reconstruct regional changes in fire regimes through time in the geological past. Existing global compilations are not geographically comprehensive and do not provide consistent metadata for all sites. Furthermore, the age models provided for these records are not harmonised and many are based on older calibrations of the radiocarbon ages. These issues limit the use of existing compilations for research into past fire regimes. Here, we present an expanded database of charcoal records, accompanied by new age models based on recalibration of radiocarbon ages using IntCal20 and Bayesian age-modelling software. We document the structure and contents of the database, the construction of the age models, and the quality control measures applied. We also record the expansion of geographical coverage relative to previous charcoal compilations and the expansion of metadata that can be used to inform analyses. This first version of the Reading Palaeofire Database contains 1676 records (entities) from 1480 sites worldwide. The database (RPDv1b - Harrison et al., 2021) is available at https://doi.org/10.17864/1947.000345.
(Earth System Science Data. vol. 14, n° 1866-3508, pp. 1109-1124, 15/10/2026)
UMR ISEM, Cirad, IRD, EPHE, PSL, CNRS, UM, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Dinoflagellate cysts response to climate change during the MIS 12/11 transition
(15/10/2026)
HNHP, MNHN, UPVD, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Do DOM optical parameters improve the prediction of copper availability in vineyard soils?
Accumulation of copper (Cu) in soils due to the application of fungicides may be toxic for organisms and hence affect winegrowing sustainability. Soil parameters such as pH and dissolved organic matter (DOM) are known to affect the availability of Cu. In this study, we investigated the contribution of chromophoric and fluorescent DOM properties to the prediction of Cu availability in 18 organic vineyard soils in the Bordeaux winegrowing area (France). The DOM parameters, assessed through absorbance and fluorescence analyses, and proxies for Cu availability (total soluble Cu and free ionic Cu2+) were measured in 0.01 M KCl extracts. Total soluble Cu (CuKCl) varied 23-fold while free ionic Cu2+ varied by a factor of 4600 among the soils. DOC concentrations were similar among the soils, but the samples differed in the quality of DOM as assessed by optical spectroscopy. Multilinear regression models with and without DOM quality parameters were investigated to predict Cu availability. The best model for CuKCl successfully explained 83% of variance and included pH, CuT, and two DOM fluorescence quality indices, the FI fluorescence index, which distinguishes between microbial and higher plant origins, and the HIX humification index. For the prediction of Cu2+, pH alone explained 88% of variance and adding DOM parameters did not improve modelling. The two Cu availability proxies were related to pH. This study confirms the prominent role of pH in Cu availability and underlines the importance of DOM quality to better predict Cu solubility
(Environmental Science and Pollution Research, n° 0944-1344, 15/10/2026)
UMR ISPA, Bordeaux Sciences Agro, INRAE, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
The abyssal giant sinkholes of the Blake Bahama Escarpment: evidence of focused deep-ocean carbonate dissolution
This study reports the discovery of abyssal giant depressions located at the toe of the Bahamian carbonate platform, along the Blake Bahama structurally-controlled Escarpment (BBE) that exhibits up to 4 km of submarine elevation above the San Salvador Abyssal Plain (SSAP). Analysis of seismic reflection and bathymetric data collected during the CARAMBAR 2 cruise revealed the presence of 29 submarine depressions; their water depths range from 4584 m to 4967 m whereas their negative reliefs are elliptical in shape, range in diameter from 255 m to 1819 m, and in depth from 30 m to 185 m. The depression alignment trends are parallel to the BBE as well as to structural lineaments of the area, exclusively between 2200 and 5000 m from its toe, and overlies a buried carbonate bench in which a high-amplitude seismic anomaly has been detected. The depression density interestingly increases where the recognized structural lineaments intersect the BBE. Based on their physical attributes (i.e. location, jagged morphologies, water depths), we interpret these depressions as collapse sinkholes rather than pockmarks or plunge pools. The aforementioned observations suggest an atypical relationship between the spatial occurrence of the giant abyssal sinkholes, the carbonate platform tectonic structures, the buried carbonate bench that underlies the hemipelagites in the SSAP and the geomorphology of the area. According to the wider literature that reports fluid seepages along submarine carbonate escarpments, we propose that the ground water entrance during low sea-level stands, the dissolution of evaporites by meteoric water, the platform-scale thermal convection and the seawater entrance at the platform edge most probably collectively act in concert to favor the circulation of brines and therefore the corrosion within the Bahamian carbonate platform. These mechanisms are particularly efficient along the structural heterogeneities (e.g. the Sunniland Fracture Zone, SFZ) which act as fluid conduits localizing the dissolution and control the physiography of the area by maintaining the location of the sedimentary pathways. The dense fluids would migrate along the faults towards the BBE free edge and are subsequently trapped into the buried carbonate bench that laterally disappears below the low-permeability deep-sea hemipelagites of the SSAP. In consequence, the trapped corrosive fluids dissolve the carbonates preferentially along the tectonic structures such as the SFZ. They are this way at the origin of the BBE curvature and generate collapse-structures in the overlying fine-grained deposits finally resulting in the formation of giant abyssal sinkholes. This structurally-directed process of dissolution seems efficient to provide a brines density head to move out down to >4.5 km of water depth and is believed to have played a major role in the BBE 5-6 km erosional retreat.
(Geomorphology. vol. 398, n° 0169-555X, 15/10/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Corrigendum to ‘Refinement of an OECD test guideline for evaluating the effects of endocrine disrupting chemicals on aromatase gene expression and reproduction using novel transgenic cyp19a1a-eGFP zebrafish’ [Aquat. Toxicol. 220 (2020) 105403](S0166445X19308392)(10.1016/j.aquatox.2020.105403)
The authors deeply regret that errors occurred in the original above article. Corrections follow below. - In the 2.7. Vitellogenin ELISA section of the Materials and methods section, the sentence “Standard / samples were pre-incubated … overnight at 4°C.” should read as “Standard / samples were pre-incubated with the primary antibody (1:1 with DR-264 zebrafish anti-VTG antibody diluted to 1:500, Biosense Laboratories, Norway) overnight at 4°C.” - In Figure 2, the authors have inadvertently forgot to apply dilution factors to the circulating E2 concentrations. The correct E2 concentrations can be found on the corrected figure bellow. [Formula presented] - In the 3.4. Circulating estradiol concentrations section of the Results section, the sentence “Nevertheless, a 48% inhibition was seen…concentration (172.6 µg/L)” should now read as “Nevertheless, a 40% inhibition was seen between the fish in the different control groups and the fish exposed to the highest concentration (PCZ 172.6 μg/l).” - In the 3.5. Circulating vitellogenin concentrations section of the Results section, the sentence “A significant decrease was measured in fish … (PCZ 172.6 μg/l).” should read as “A significant decrease was measured in fish exposed to the highest concentration of PCZ, with a fall from 23.40 ± 5.11 mg/ml (DMSO) to 6.10 ± 0.74 mg/ml (PCZ 172.6 μg/l).” - In Figure 3, the unit reported on the Y-axis for the vitellogenin concentrations in mg/ml should read as ng/ml. - In the 4.1. Effect of PCZ on classical endpoints of the OECD TG 229 in cyp19a1a-eGFP zebrafish of the Discussion section, the sentence “From a quantitative point of view, the data….(Doering et al., 2019)” should now read as “From a quantitative point of view, the data we obtained in the cyp19a1a-eGFP zebrafish (40 % decrease of estradiol concentration in the high concentration of PCZ compared to control females, leading to a 65 % decrease of circulating VTG and finally to 60 % less eggs produced) are in perfect adequation with the quantitative relationships existing between all key events of the AOP recently described for wildtype zebrafish (Doering et al., 2019).” These corrections do not affect the conclusions of the article in any way. The authors would like to apologise for any inconvenience caused. DOI of original article: https://doi.org/10.1016/j.aquatox.2020.105403 Nathalie Hinfray © 2022
(Aquatic Toxicology. vol. 247, n° 0166-445X, 15/10/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS