Pierre-Yves Collin

• Senior Lecturer
• Université Bourgogne Europe

Microtexture describes the type of particles and their arrangement in matrix samples at scanning electron microscopy scale. Although a microtexture classification exists for micritic limestone, it cannot be directly applied to chalk. This study therefore proposes a classification of chalk microtextures and discusses the origin of microtexture varia...

Assessing the thermal evolution of sedimentary basins over time is a major aspect of modern integrated basin analysis. While the behavior of clay minerals and organic matter with increasing burial is well documented in different geological and thermal settings, these methods are often limited by the temperature ranges over which they can be precise...

Les écoulements dans la craie de Normandie sont contraints par des caractéristiques sédimentologiques très particulières. A la suite de la présentation de la théorie des horizons karstogènes de la craie lors du colloque du CFH de 2018, cet article propose une approche originale fondée sur des observations hydrogéologiques, pétrologiques et sédiment...

Assessing the thermal evolution of sedimentary basins over time is a major aspect of modern integrated basin analysis. While the behavior of clay minerals and organic matter with increasing burial is well documented in different geological and thermal settings, these methods are often limited by the temperature ranges over which they can be precise...

The Oolithe Blanche Formation (Bathonian, Middle Jurassic) is one of the deep saline aquifers of the Paris Basin in France. The spatial distribution of its reservoir properties (porosity, permeability, tortuosity, etc.) is now better known with relatively homogeneous properties, except for some levels in the central part of the basin, where permeab...

In the study of Earth-surface environmental processes during the events associated with the Permian–Triassic boundary, a key issue is the nature of the latest Permian pre-extinction surface in shallow marine limestones in numerous sites, principally within the Tethyan realm. Sediments below this surface pre-date the extinction event, so that the li...

The mechanical behavior of oolithic carbonate rocks was investigated for selected rocks with two different microstructural attributes: uniform (UP) and rimmed (RP) distribution of microporosity within ooids. These oolithic carbonate rocks are from the Oolithe Blanche formation, a deep saline aquifer in the Paris Basin, and a possible target for CO2...

An integrated biostratigraphic approach, based on ammonites, calcareous nannofossils, dinoflagellates, combined with sedimentology, carbon-isotope and physical stratigraphy, is proposed for the Subalpine Basin (Thuoux and Saint-Pierre d’Argençon sections). Within the expanded marl deposits of the Terres Noires Fm., the Callovian- Oxfordian boundary...

Rapid and profound changes in earth surface environments and biota across the Permian-Triassic boundary are well known and relate to the end-Permian mass extinction event. This major crisis is demonstrated by abrupt facies change and the development of microbialite carbonates on the shallow marine shelves around Palaeo-Tethys and western Panthalass...

Mechanical behaviour of porous carbonate rocks and the effect of microstructural parameter (Middle Jurassic limestones, Paris Basin, France) * Corresponding author: regnet@geologie.ens.fr In recent studies, P-wave velocity measurements performed on samples from the Oolithe Blanche formation (Middle Jurassic Limestone, Paris basin) showed that dyn...

L'aquifère salin profond du Bathonien du bassin de Paris constitue une cible privilégiée pour le stockage géologique du CO2 et pour l'exploitation géothermique. Les circulations actuelles des fluides au sein de ce réservoir carbonaté sont largement contraintes par ses propriétés pétrophysiques. Ces dernières, notamment le taux de cimentation, sont...

La formation carbonatée de l'Oolithe Blanche (Bathonien) du Bassin de Paris est, avec le Trias, un aquifère salin profond majeur qui présente un potentiel réservoir important et reconnu, notamment via l'exploitation géothermique ou les grands projets de recherche dans le domaine du stockage géologique du CO2. Elle a été largement étudiée d'un point...

The Thuoux and Saint-Pierre d’Argençon sections (Subalpine Basin, southeastern France) are proposed as a potential GSSP candidate for the Callovian–Oxfordian boundary. Several aspects of stratigraphy that have recently been applied in the two selected sections are discussed, including ammonite and nannofossil biostratigraphy, palynology, physical s...

We present the first study of micro-crustaceans (ostracods) associated with microbial crusts in the aftermath of the most devastating extinction, the end-Permian extinction (EPE). These post-extinction microbialites dominated shallow shelf marine environments and were traditionally considered as devoid of any associated fauna. We present a micro-pa...

Ocean acidification in modern oceans is linked to rapid increase in atmospheric CO2, raising concern about marine diversity, food security and ecosystem services. Proxy evidence for acidification during past crises may help predict future change, but three issues limit confidence of comparisons between modern and ancient ocean acidification, illust...

Permian-Triassic boundary microbialites (PTBMs) are thin (0.05-15 m) carbonates formed after the end-Permian mass extinction. They comprise Renalcis-group calcimicrobes, microbially mediated micrite, presumed inorganic micrite, calcite cement (some may be microbially influenced) and shelly faunas. PTBMs are abundant in low-latitude shallow-marine c...

In their comment on our paper (Boulila S. et al. 2010 — Orbitally forced climate and sea-level changes in the Paleoceanic Tethyan domain, marl–limestone alternations, Lower Kimmeridgian, SE France, Palaeogeog. Palaeoclim. Palaeoecol., 292, 57–70), Mattioli and co-authors (E. Mattioli et al., Comment on "Orbitally forced climate and sea-level change...

Logging opens wide paths for cyclostratigraphic studies of sedimentary successions. In clay-dominated rocks, magnetic susceptibility (MS) is very informative and the quality of the results can be further enhanced by deconvolution, where the deformation of the original susceptibility versus depth variation by the instrument is filtered out by its im...

Instability structures, synsedimentary faults and turbidites have been studied in the Lower Pliensbachian succession of Saint-Michel-en-Beaumont, belonging to the Taillefer block, an ancient half-graben emplaced during the Liassic Tethyan rifting. Geometrical and mechanical analyses demonstrate that the instability structures occurred thanks to mov...

Petrophysical properties were measured on oolitic limestone from the Oolithe Blanche formation (middle Jurassic) in the Paris Basin. Eighteen oriented blocks were collected from three outcrops regarding of the three main facies, oolitic shoal facies, tide dominated facies and prograding oolitic facies. We investigated the relationship between both...

The Permian–Triassic Boundary sequence at C¸u¨ ru¨k Dag, near Antalya, Turkey, begins with a major erosion surface interpreted as being the Late Permian lowstand, on which lies ca 0Æ4 m of grainstone/packstone composed of ooids, peloids and bioclasts. Most ooids are superficial coats on fragments of calcite crystals presumed to be eroded from cryst...

The Arabian, African and Eurasian plates interact in the Levantine region. Despite numerous studies of the region, many geological issues relating to Mesozoic times remain unresolved. The Lebanon passive margin is a key area for understanding Neo-Tethyan sedimentary history during this period. The Jurassic succession in Lebanon is well exposed and...

High-resolution analysis (2277 samples) of magnetic susceptibility (MS) was performed on ∼700-m-thick Early–Middle Oxfordian marine marls of the Terres Noires Formation, SE France. MS variations within these sediments record sub-Milankovitch to Milankovitch frequencies with long-term eccentricity (405 kyr and ∼2 Myr) being the most prominent. The 4...

La présente étude s'intègre dans le cadre du projet de recherche SHPCO2 (Simulation Haute performance pour le stockage géologique de CO2), financé par l'ANR(1) et en partenariat avec l'IFP, ENSMSE(2), LAGA(3), INRIA(4). Il est dédié au développement d'une plate-forme informatique haute performance pour la simulation numérique du stockage géologique...

The Permian–Triassic Boundary sequence at Çürük Dag, near Antalya, Turkey, begins with a major erosion surface interpreted as being the Late Permian lowstand, on which lies ca 0·4 m of grainstone/packstone composed of ooids, peloids and bioclasts. Most ooids are superficial coats on fragments of calcite crystals presumed to be eroded from crystal f...

The Global Stratotype Section and Point (GSSP) of the Permian–Triassic boundary, located in Meishan, Zhejiang Province, South China, was sampled bed-by-bed for ostracods. Ninety-eight species belonging to forty-three genera are recognized. Twenty-five new species are described and figured: Bairdia bassoni Crasquin sp. nov., B. broutini Crasquin sp....

High-resolution analysis of multiple climatic proxies was carried out on a ∼ 8.5-m Lower Kimmeridgian interval of a pelagic marl–limestone succession at Châteauneuf-d'Oze (Vocontian Basin, southeastern France). The aim of the study was to characterize the orbitally controlled sedimentary cyclicity and to decipher paleoclimatic and paleoceanographic...

The Paris Basin appears to be appropriate in terms of CO2 capture and storage when considering both the amount of CO2 produced and the availability of depleted fields and deep saline aquifers. The purpose of this study is to investigate the petrophysical properties in relation with the sedimento-diagenetic environment of the "Oolithe Blanche" forma...

The objective of the GéoCarbone-PICOREF project was to select and characterize geological sites where CO2 storage in permeable reservoir could be tested at the pilot scale. Both options of storage in deep saline aquifer and in depleted hydrocarbon field were considered. The typical size envisioned for the pilot was 100 kt CO2 per year. GéoCarbone-P...

The objective of the GéoCarbone-PICOREF project was to select and characterize geological sites where CO2 storage in permeable reservoir could be tested at the pilot scale. Both options of storage in deep saline aquifer and in depleted hydrocarbon field were considered. The typical size envisioned for the pilot was 100 kt CO2 per year. GéoCarbone-P...

‘Anachronistic facies’ and ‘disaster forms’ are interpretive terms applied from the early 1990s to sedimentary deposits and biotas in the aftermath of mass extinctions; both terms have been used especially for the deposits formed directly after the end-Permian mass extinction. Microbial carbonates (disaster forms) are abundant in the earliest Trias...

Ostracods (Crustacea) are benthic inhabitants well known for their consistent qualities as paleoenvironment markers. In particular, they are reliable indicators of water oxygenation level: filter feeders are more common in poor oxygen conditions, contrasting with deposit feeders, which are abundant in well-oxygenated settings. In the Permian/Triass...

[Payne et al. (2007)][1] suggest that there is widespread evidence for a carbonate dissolution surface at the level of the end-Permian mass extinction, and that this crisis was at least partly due to ocean acidification that preferentially affected heavily calcified marine invertebrates. These ideas

Abstract The Permian–Triassic boundary interval in shallow shelf seas of South China shows Upper Permian limestones overlain by lowermost Triassic microbialites. Global sea-level rose across the Permian–Triassic boundary, but an irregular top-Permian erosion surface across a 10 km north–south transect of the Great Bank of Guizhou contains evidence...

Magnetic susceptibility (MS) variations record Earth's orbital parameters in the clays and marls of the Early Oxfordian in the Paris and Vocontian basins of France. Climatically driven weathering of surrounding emergent areas and the resulting detrital input to the basins is a significant source of the MS signal. MS proves to be an effective tool f...

Classic stratigraphic methods rarely provide high-resolution correlations between intrabasinal sedimentary sequences, which are important to understand the origin of sedimentation process and its environmental change. In this study, we investigate high-resolution cyclostratigraphic correlation from magnetic susceptibility in two Early Kimmeridgian...

High-resolution magnetic susceptibility (MS) analysis was carried out on a Lower Kimmeridgian alternating marl–limestone succession of pelagic origin that crops out at La Méouge (Vocontian Basin, southeastern France). The aim of the study was to characterize the strong, dm-scale sedimentary cyclicity of the succession at a very high resolution, and...

Earliest Triassic microbialites (ETMs) and inorganic carbonate crystal fans formed after the end-Permian mass extinction (ca. 251.4Ma) within the basal Triassic Hindeodus parvus conodont zone. ETMs are distinguished from rarer, and more regional, subsequent Triassic microbialites. Large differences in ETMs between northern and southern areas of the...

The Oxfordian (Late Jurassic) was a time of widespread change in Jurassic marine (carbonate) sedimentation patterns. A marked positive excursion in δ13C is dated as Middle Oxfordian in age. In this study we investigate if changes in carbonate sedimentation coincided with altered carbon cycling and climate. We use C-isotope records as a proxy for th...

Abstract Environmental and chronological interests of the brachiopod bioaccumulations. Example of the Upper Oxfordian (Upper Jurassic) of the Paris Basin (France). In the Upper Jurassic of the eastern Paris Basin, brachiopods can be preserved in abundance in particularly thin levels. The apparent biodiversity is poor in such lithological units, whi...

Environmental and chronological interests of the brachiopod bioaccumulations. Example of the Upper Oxfordian (Upper Jurassic) of the Paris Basin (France). In the Upper Jurassic of the eastern Paris Basin, brachiopods can be preserved in abundance in particularly thin levels. The apparent biodiversity is poor in such lithological units, which appear...

The Middle–Upper Jurassic boundary corresponds to a period of far-reaching changes in sedimentation patterns related to alterations in the palaeoclimate and in the global carbon cycle. Marl deposits were laid down in the east of the Paris Basin at this time and ANDRA has selected these lithological units as the site for an underground study laborat...

This study integrates research conducted by ANDRA at the Underground Research Laboratory of Bure (Meuse, France) to investigate the feasibility of a deep geological waste repository in clay for high-level and long-lived intermediate-level radioactive waste. The aim of this study is to detect possible sedimentary gaps in the upper Callovian-lower Ox...

Carbonate platforms across Western Europe were superseded at the Middle–Upper Jurassic (Callovian–Oxfordian) boundary either by alternating marl–limestone and widespread marl deposits or by condensed sections containing iron ooids. The characteristics of marine condensed sections in the south-eastern part of the Paris Basin (France) and their distr...

The Middle-Upper Jurassic boundary in western Europe is characterized by extensive condensed sections containing authigenic minerals together with abundant and varied fossils, both reworked and not reworked. We have analyzed ammonite shells and chronologically ordered taphonomic events in a taphonomic sequence extending from the time the dead organ...

The Saint-Blin-Sémilly section (Haute-Marne) consists of a continuous non-condensed Oxfordian marl succession (60 m), which is equivalent to the well-known condensed ferruginous oolite succession 50 km to the southwest. Despite the more distal depositional paleoenvironment around Saint-Blin, the biostratigraphical records are similar in both succes...

The outcrops laying around Crotenay (Central Plateau of the septentrional Jura, France), exhibit the best actually known sections of the Lower to Middle Owfordian deposits, in the depositional-area of the pyritic clay-shales (Eastern France, Switzerland, etc.). This section is of great interest, first because of its geographical, location, halfway...

Several depositional environments associated with Callovian-Oxfordian condensed series of the southeast of the Paris Basin are defined. As sedimentation rates were very low, variations in palaeodepth, which were synchronous at regional scale, were taken to directly reflect fluctuations in accommodation potential. Within a major trend toward increas...

For the first time in eastern France, a detailed succession of the uppermost Lower Callovian to Lower Upper Callovian Kosmoceratinae is presented, according to the fossils collected in situ at Blye (Jura, France). It is compared with the abundant data from Champagne and Bourgogne. These ammonites may allow more accurate correlations between the sub...

Abstract- For the first time in eastern France, a detailed succession of the uppermost Lower Callovian to Lower Upper Callovian Kosmoceratinae is presented, according to the fossils collected in situ at Blye (Aura, France). It is compared with the abundant data from Champagne and Bourgogne. These ammonites may allow more accurate correlations betwe...