Jean‐Yves Reynaud

University of Lille Nord de France · Faculty of Science, Department of Earth Sciences

The present study focuses on the morphosedimentary organization and sediment infilling stratigraphy of one of the largest estuaries of southern Patagonia in Argentina. With a tidal range up to 12 m, the area is subject to extreme tidal conditions, combined with moderate offshore wave climate, strong and constant westerly winds, and contrasted water...

The southern coast of Argentina is known for its high tidal ranges and large coarse-grained coastal barriers that have emerged over time as a result of the regional uplift. Well-preserved barriers can provide critical information about the morphological evolution of the coastal areas, and the relative evolution of the mean sea level, as long as the...

The French Flemish Coastal Plain, which extends from Denmark to France, is characterised by a topography close to sea level and protected by a system of coastal dunes. Quaternary sediments, comprised of marine, estuarine and continental deposits, accumulated by infilling and then prograding above a network of incised valleys. This study focusses on...

The Lower Cretaceous deposits of North Africa represent a terrestrial to shallow marine sandstone-dominated succession often referred to as the “Continental Intercalaire” (CI) and Nubian Sandstone (NS) informal groups. The upper Barremian Sidi Aich Formation of the CI is distinguished throughout the Chotts basin of southern Tunisia by sandstone-dom...

Le suivi régulier d’un chantier de terrassement localisé à la limite des communes de Lezennes et de Villeneuve d’Ascq, au cœur de la Métropole de Lille (59, Nord), a permis d’observer et d’analyser en détail le contact géologique entre le « tuffeau » du Thanétien et la craie du Coniacien. Cette surface de contact apparaît remarquablement nette et p...

The Marnes Bleues Formation from the Vocontian Basin (Southeastern France) shows many organic rich levels, some concomitant to oceanic anoxic events OAE1a and OAE1b. These organic-rich levels are scattered through a thick homogeneous succession of marls, poor in organic matter (OM). Through a multi-parameter approach, the organic-rich levels from t...

Highlights • Lack of evidence to support a counterclockwise rotation of the Piñon block and the coeval opening of the Progreso Basin. • Development of a forearc basin controlled by the complex interplay of oblique subduction, rise of an outer forearc high, and tectonic escape. • Post-accretion strain partitioning across an outer wedge with a vary...

The interest in the Niger Delta hydrocarbon field in exploration and exploitation has never been more serious in recent times. With growing interest in proven field prospects, little attention is rendered to field appraisal studies. In this contribution, high-resolution 3-D seismic data, well logs, and biostratigraphic information were integrated i...

The interest in the Niger Delta hydrocarbon field in exploration and exploitation has never been more serious in recent times. With growing interest in proven field prospects, little attention is rendered to field appraisal studies. In this contribution, high-resolution 3-D seismic data, well logs, and biostratigraphic information were integrated i...

The Sotta – Bonifacio – Santa Teresa di Gallura sheet is located in the far south of the island of Corsica, also covering the northernmost tip of La Gallura in Sardinia via the Strait of Bonifacio. Volcanic and sedimentary formations of Miocene age, unconformably overlying a structurally deformed basement of Hercynian age, form the Bonifacio Causse...

Widespread anoxic events (OAEs) affected the Tethys Ocean during the Mesozoic. The OAE1a (Early Aptian), expressed as the Selli Level or Goguel Level in European basins. The Goguel Level was deposited in the French Vocontian Basin, a semi‐enclosed basin connected to the Tethys. This study presents an integrated approach (Rock Eval, clay minerals, g...

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Illitisation requires potassium incorporation into a smectite precursor, a process akin to reverse weathering. However, it remains unclear whether microbes facilitate K + uptake to the sediments and whether illitisation was important in the geological past. The 2.1 billion-year-old Francevillian Series of Gabon has been shown to host mat-related st...

Significance The 2.1 billion-year-old sedimentary strata contain exquisitely preserved fossils that provide an ecologic snapshot of the biota inhabiting an oxygenated shallow-marine environment. Most striking are the pyritized string-shaped structures, which suggest that the producer have been a multicellular or syncytial organism able to migrate l...

The SW of Ecuador offers a great opportunity to study the long-term behavior of an almost entire forearc system, from the external accretionary prism to the landward limit of the forearc basin. A combination of field observations, LA-ICP-MS UPb dating on zircon and interpretation of different vintages of unpublished industrial seismic records are u...

The SW of Ecuador offers a great opportunity to study the long-term behavior of an almost entire forearc system, from the external accretionary prism to the landward limit of the forearc basin. A combination of field observations, LA-ICP-MS UPb dating on zircon and interpretation of different vintages of unpublished industrial seismic records are u...

L’objectif de ce travail est d’étudier la sédimentologie des dépôts organiques dans un bassin hémipélagique (séries mésozoïques du Bassin du S-E de la France) afin de comprendre les processus de transport et de préservation de la matière organique (MO), ainsi que sa distribution dans les différents cortèges sédimentaires. Les résultats démontrent q...

In his discussion, Pratt argues that a number of features characterizing the described facies can be interpreted as seismites. We thank him for highlighting this point and of course we agree that seismites in the FB unit of the Franceville Basin are highly probable, because deposition was contemporaneous to the activity of major faults in the vicin...

The Gulf of Guayaquil, Southern Ecuador, is the largest tidal system of the Pacific margin of South America. The incipient oceanic tide has a tidal range of over 1m and is amplified on the continental shelf, which is widened in this area by the tectonic activity related to the northward escape of the North Andean Block. The head of this embayment c...

Our aim is to investigate the processes controlling the sedimentation of organic matter (OM) in deep marine basins using a multiproxy approach (clastic-fraction grain-size, Rock Eval parameters, elemental composition, clay-mineral assemblages, molecular biomarkers), to assess the way continental OM is distributed along a proximal-distal transect. F...

The depositional setting of the 2.1 Ga fill to the Franceville Basin of Gabon is important for understanding the habitat (energy and availability of light and oxygen) and taphonomy of recently discovered early macro-organisms buried in black shales in Unit FB. The available data bearing on the stratigraphy and sedimentology of Unit FB provide new i...

The depositional setting of the 2�1 Ga fill of the Franceville Basin of Gabon is important for understanding the habitat (energy and availability of light and oxygen) and taphonomy of recently discovered early macro-organisms buried in black shales in Unit FB. The available data bearing on the stratigraphy and sedimentology of Unit FB provide new i...

Le début de l'Aptien est marqué par un événement associé à de nombreux dépôts de sédiments enrichis en matière organique (MO) : l'Oceanic Anoxic Event (OAE) 1a. Une des spécificités de cet événement est la faible oxygénation des eaux océaniques, favorisant de ce fait la préservation de la MO. Dans le bassin vocontien (apophyse de la Téthys), cet ép...

La Formation des Marnes Bleues (Aptien-Albien) est composée principalement de marnes grises avec de nombreuses occurrences de slumps, turbidites et grès massifs sur une épaisseur d'environ 600 m. Cette formation affleure dans le bassin Vocontien et s'est déposée en domaine hémipélagique le long d'une ancienne marge téthysienne. Une des caractéristi...

L'analyse de plusieurs centaines de puits pétroliers corrélés de proche en proche, associée à un réexamen des affleurements, complète et révise la synthèse antérieure de G. Busson. Elle confirme les idées de Busson sur l'âge barrémien et non albien des grès de Chenini/Oum ed Diab de Tunisie du Sud, avec ses conséquences sur la révision obligatoire...

Depuis quelques années, il apparaît que le dépôt de matière organique (MO) d’origine terrestre en domaine marin n’est pas réservé à la plate-forme et le haut de la pente de la marge continentale. Dans des travaux précédents, un enregistrement conséquent de MO d’origine continentale a été observé en milieu bathyal (Huc et al., 2001, Kripounoff et al...

In order to better constrain the relationship between tectonics and sedimentation of the Eastern Sardinian Margin, from the Messinian to the present day (METYSS project), a lithostratigraphic study was carried out on the Late Neogene deposits along the Cedrino Valley (eastern Sardinia). The late Neogene evolution is documented from sedimentological...

The North Anatolian Fault Zone (NAFZ) is one of the most hazardous active faults on Earth, yet its Pliocene space‐time propagation across the north Aegean domain remains poorly constrained. We use low‐temperature multi‐thermochronology and inverse thermal modelling to quantify the cooling history of the upper crust across the Olympus range. This ra...

We thank Debroas et al . for their comments and we are ready to pay attention to their concerns. Any positive input and constructive remarks that would improve our model will be appreciated. We are well aware that our article may include some points of discussion and that our model integrates conceptual parts. However, since our study is based on t...

La série mésozoïque de la plateforme saharienne enregistre pendant plus de 200 millions d'années l'évolution de la transition terre-mer sur la marge sud-téthysienne. Pendant presque toute cette période, la sédimentation se fait au niveau de base et avec une subsidence grande longueur d'onde. Les variations de l'onlap au premier ordre et les conditi...

Oil sands, including the Athabasca Oil Sands in northern Alberta, are the second largest hydrocarbon resource on earth. In the last decade, engineering technology has evolved that can now economically produce the bitumen resource in the oil sands. This volume showcases the geology of oil sands from around the world. It highlights the Athabasca Oil...

This study documents a change from a non‐tidal to tide‐dominated shelf system that occurred between Corsica and Sardinia (the Bonifacio Basin, Western Mediterranean) during the early to middle Miocene. The non‐tidal deposits formed on a low‐energy siliciclastic shelf surrounded by progradational coralline algal ramps at full highstand. The tidal de...

This article is an attempt to synthesize the knowledge about the Mesohellenic Basin (MHB), based upon available literature and also unpublished data. We focus on our interpretation but also mention alternative ones. The MHB is an orogenic basin of general importance, because of (i) its large size (300km along strike, and 150km in Greece) ; (ii) its...

This article is an attempt to synthesize the knowledge about the Mesohellenic Basin (MHB), based upon available literature and also unpublished data. We focus on our interpretation but also mention alternative ones. The MHB is an orogenic basin of general importance, because of (i) its large size (300km along strike, and 150km in Greece) ; (ii) its...

The Miocene Sommières Basin in SE France is a semi-enclosed depression that was connected to the Mediterranean Sea by a flooded paleo-incised valley and then filled by a suite of sediments comprising carbonate grains coming from temperate factories that were largely deposited in tidal-dominated paleoenvironments. The strata are partitioned into two...

The sedimentology and stratigraphy of the Miocene deposits of the Uzes-Castillon basin are revisited. This basin, located in SE France at the junction between the perialpine foreland basin and the W Mediterranean margin, sits in a syncline that formed during the latest Cretaceous Pyrenean tectonic phase. It records the succession of shallow-water m...

Outcrop and subsurface investigations highlight that the main reservoirs within the Cretaceous McMurray Formation, Alberta, Canada, were located in an ancient estuary and that the major economic targets are represented by large point bar deposits. The underlined morphological characteristics of the associated McMurray-valley drainage show morphomet...

In the eastern Pyrenees, the lherzolites always outcrop as restricted bodies scattered across Mesozoic sedimentary units along the North Pyrenean fault. In this article, we focus on the sedimentary processes associated with the tectonic exhumation of the mantle rocks during the Lower Cretaceous and we provide a new detailed analysis of the ultramaf...

Several formations with various breccia types occur in Mesozoic basins disseminated along the North Pyrenean fault, on the northern flank of the French Pyrenees. Due to their location along the Iberia-Europa plate boundary, the North Pyrenean breccia formations represent complex archives documenting the tectonic and sedimentary evolution of the Pyr...

Shallow-marine tidal deposits form on open shelves, and more specifically in open-mouthed embayments and semi-enclosed epicontinental seas, where the oceanic tide is amplified by resonance. They are also present in straits and seaways where the tidal currents are accelerated by flow constriction. Complex interactions of the tide with the seafloor a...

L'acquisition récente de données sismiques THR dans les Bouches de Bonifacio s'inscrit dans le cadre du projet PALEOTIDES qui vise à comprendre les contraintes paléogéographiques présidant à un épisode de forts courants de marée dans le domaine méditerranéen au Miocène. La conjonction de l'ouverture du Golfe du Lion pendant une période où la Médite...

Cette étude se situe dans la perspective de l'analyse de l'évolution post-messinienne de la marge ouest-tyrrhénienne (programme Metyss). Les pentes accidentées des reliefs granitiques au dessus de la vallée du Cedrino sont couvertes de l'amont vers l'aval par des blocs chaotiques, des accumulations de poudingues et brèches polygéniques ou monogéniq...

Le projet terre-mer METYSS a pour objectif de comprendre les effets immédiats et différés de la Crise de Salinité Messinienne (CSM) ainsi que les relations tectonique et sédimentation sur la marge est-sarde. Cette marge résulte de l'ouverture de la Mer Tyrrhénienne à partir du Tortonien et jusqu'au Messinien (c. 9 à 5 Ma). Des bassins profonds exis...

The geology of the Channel Western Approaches is a key to understand the post-rift evolution of the NW European continental margin in relation with the Europe/Africa collision. Despite considerable evidence of Tertiary tectonic inversion throughout the Channel basin, the structures and amplitudes of the tectonic movements remain poorly documented a...

The wide outcrops along the cliffs of Bonifacio at the southern tip of Corsica expose two stratigraphic series of shallow marine deposits, the reefal Cala di Labra Formation (Upper Burdigalian), and the Bonifacio Formation (Lower Langhian at the youngest). Both series are transgressive on the faulted Hercynian basement. The Bonifacio Formation is d...

The stratigraphy of incised valleys and estuaries sediment infill is the topic of many studies and international publications since the beginning of the 1990’s [Dalrymple, 2006]. The growing interest for incised valleys and estuaries partly arises from the fact that they represent key objects for sequence stratigraphy analyses at the land-sea tr...

The Meteora are a famous sightseeing area of northern Greece, namely for the monasteries culminating at the strange pinnacles surrounded by impressive cliffs made of a stack of conglomeratic fan deltas from the Lower Miocene. This paper analyzes the imprint on their stratigraphy of regional deformation related to the subduction of the external zone...

Some of the striking results of the papers published in the special publication "French Incised valleys, estuaries and lagoons" of the Bulletin de la Société géologique de France are presented and compared. The selection of papers within this volume focuses exclusively on the recent progress made on modern French incised valleys, estuaries and lago...