A5016740403- Paleontology and Stratigraphy of Fossils
- Geology and Paleoclimatology Research
- Marine Biology and Ecology Research
- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Marine and coastal ecosystems
- Geochemistry and Elemental Analysis
- Ocean Acidification Effects and Responses
- Geological and Geochemical Analysis
- Heavy metals in environment
- Calcium Carbonate Crystallization and Inhibition
- Groundwater and Isotope Geochemistry
- Astro and Planetary Science
- Marine and environmental studies
- Geological formations and processes
- Geological and Geophysical Studies
- Pleistocene-Era Hominins and Archaeology
- Algal biology and biofuel production
- Mercury impact and mitigation studies
- Geochemistry and Geologic Mapping
- Geological and Geophysical Studies Worldwide
- Marine and coastal plant biology
- CO2 Sequestration and Geologic Interactions
- Caveolin-1 and cellular processes
Laboratoire d’Océanologie et de Géosciences
2020-2024
Université de Lille
2020-2024
Centre National de la Recherche Scientifique
2017-2024
Université du littoral côte d'opale
2020-2024
Institut de Recherche pour le Développement
2024
Université Paris Cité
2008-2021
Institut de physique du globe de Paris
2021
Institut des Sciences de la Terre de Paris
2007-2020
Sorbonne Université
2008-2020
University of Oxford
2009-2018
The Mesozoic Era featured emplacement of a number Large Igneous Provinces (LIPs), formed by the outpouring millions cubic kilometres basaltic magma. radiometric ages several LIPs coincide with dates Oceanic Anoxic Events (OAEs). As result these coincidences, causal link has been suggested, but never conclusively proven. This study explores use mercury as possible direct between Karoo–Ferrar LIP and coeval Toarcian OAE (T-OAE). Mercury is emitted to atmosphere trace constituent volcanic gas,...
Abstract Increased use and improved methodology of carbonate clumped isotope thermometry has greatly enhanced our ability to interrogate a suite Earth‐system processes. However, interlaboratory discrepancies in quantifying (Δ 47 ) measurements persist, their specific sources remain unclear. To address differences, we first provide consensus values from the community for four standards relative heated equilibrated gases with 1,819 individual analyses 10 laboratories. Then analyzed along three...
Despite a growing body of work that uses diatom δ30Si to reconstruct past changes in silicic acid utilisation, few studies have focused on calibrating core top data with modern oceanographic conditions. In this study, microfiltration technique is used divide Southern Ocean silica into narrow size ranges, separating components such as radiolaria, sponge spicules and clay minerals from diatoms. Silicon isotope analysis these demonstrates inclusion small amounts non-diatom material can...
Abstract. One of the most elusive aspects Toarcian oceanic anoxic event (T-OAE) is paradox between carbon isotopes that indicate intense global primary productivity and organic burial at a scale, delayed expression anoxia in Europe. During earliest Toarcian, no black shales were deposited European epicontinental seaways, enrichment sediments postdated end overarching positive trend characterises T-OAE. In present study, we have attempted to establish sequence stratigraphic framework for...
Calcite microfossils are widely used to study climate and oceanography in Earth's geological past. Coccoliths, readily preserved calcite plates produced by a group of single-celled surface-ocean dwelling algae called coccolithophores, have formed significant fraction marine sediments since the Late Triassic. However, unlike shells foraminifera, their zooplankton counterparts, coccoliths remain underused palaeo-reconstructions. Precipitated an intracellular chemical isotopic microenvironment,...
The Early Toarcian was characterized by two large perturbations to the carbon cycle: a positive trend associated with increased organic matter burial and ocean anoxia, pronounced negative isotope excursion (CIE). We contrast geochemical evolution in carbonate phases of successions: one from Paris Basin (Sancerre core, comprising black shales), other Lusitanian (Peniche section very minor lithological expression bottom water anoxia). Our aim identify whether these cycle were related,...
There is an urgent requirement to understand how large fluctuations in tropical heat distribution associated with the El Niño–Southern Oscillation (ENSO) will respond anthropogenic emissions of greenhouse gases. Intervals global warmth Earth history provide a unique natural laboratory explore behavior ENSO warmer world. To investigate interannual climatic variability, specifically ENSO, mid‐Piacenzian Warm Period (mPWP) (3.26–3.03 Ma), we integrate observations from stable isotopes multiple...
AB Aquatic Biology Contact the journal Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 22:177-193 (2014) - DOI: https://doi.org/10.3354/ab00610 Theme Section: Environmental forcing of aquatic primary productivity Short-term effects increasing CO2, nitrate and temperature on three Mediterranean macroalgae: biochemical composition F. L. Figueroa1, J. Bonomi Barufi2, E. Malta3,*, R. Conde-Álvarez1, U. Nitschke4, Arenas5,...
Abstract. By recreating a range of geologically relevant concentrations dissolved inorganic carbon (DIC) in the laboratory, we demonstrate that magnitude vital effects both and oxygen isotopes coccolith calcite multiple species relates to ambient DIC concentration. Under high levels, all examined coccoliths exhibit significantly reduced isotopic offsets from compared substantial expressed at low (preindustrial present-day) concentrations. The supply cell exerts primary control on biological...
Abstract Coccolithophores are single-celled photosynthesizing marine algae, responsible for half of the calcification in surface ocean, and exert a strong influence on distribution carbon among global reservoirs, thus Earth’s climate. Calcification ocean decreases buffering capacity seawater CO 2 , whilst photosynthetic fixation has opposite effect. Experiments culture have suggested that coccolithophore under high concentrations ([CO (aq)]) constituting negative feedback. However, extent to...
Significance The long-term cooling trend of the Cenozoic is punctuated by shorter-term climatic events, such as inception permanent ice sheets on Antarctica at Eocene−Oligocene Transition (∼33.7 Ma). Taking advantage excellent state preservation coccolith calcite in equatorial Atlantic deep-sea cores, we unveil progressive tropical warming Ocean initiated 4 million years prior to Antarctic glaciation. Warming preceding glaciation may appear counterintuitive, but argue that this precursor EOT...
AB Aquatic Biology Contact the journal Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 22:159-176 (2014) - DOI: https://doi.org/10.3354/ab00576 Theme Section: Environmental forcing of aquatic primary productivity Short-term effects CO2, nutrients and temperature on three marine macroalgae under solar radiation D. B. Stengel1,*, R. Conde-Álvarez, S. Connan, U. Nitschke, F. Arenas, H. Abreu, J. Bonomi Barufi, Chow,...
Coccolithophore biominerals, the coccoliths, represent an important part of Meso-Cenozoic sedimentary archive. Geochemical analyses coccoliths can be used to unravel climatic fluctuations in oceanic realm, but such reconstructions are complicated due problem "vital effect". This concept refers modulation record physico-chemistry seawater calcite algal physiology. For decades, it was thought that magnitude vital effect species-specific and constant for a given species. Recent studies aiming...
Coccoliths contribute significantly to pelagic sediments formed over the last 200 million years, yet their geochemistry has been largely overlooked as a potential record of palaeoenvironmental information. Recently developed techniques have enabled successful extraction coccolith-dominated sediment fractions. However, reliability interpretations that can be drawn from coccolith analyses is still confounded by poor understanding "vital effect" – physiological component isotopic composition...
Abstract. In order to understand the significance of worldwide deposition black shale facies in Early Toarcian (~ 183 Ma), considerable attention has been drawn this Jurassic sub-stage over last 3 decades. The discovery a pronounced negative carbon isotope excursion (CIE) within shales disrupting generally positive trend isotopes stimulated many studies, particularly with view establish local versus global nature major geochemical phenomenon. Here we document sedimentological and...