Search results for: Christophe Lécuyer

Items from 1 to 20 out of 102 results

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Geographic origin and social status of the Gallic warriors from Ribemont‐sur‐Ancre (France) studied through isotope systematics of bone remains

Thibault Clauzel, Pascale Richardin, Jannick Ricard, Gilles Prilaux, more

International Journal of Osteoarchaeology > 33 > 1 > 39 - 50

Ribemont‐sur‐Ancre, France, is the biggest excavated human skeletal assemblage of Northern Gaul. It is interpreted as a post‐battle deposit constructed to celebrate war. However, the chronology of the site, its organization and the origin of the buried warriors are still poorly understood. These problems are studied by a multi‐proxy approach, based on radiocarbon dating, stable and radiogenic isotope...

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Inter‐laboratory Characterisation of Apatite Reference Materials for Oxygen Isotope Analysis and Associated Methodological Considerations

Alicja Wudarska, Michael Wiedenbeck, Ewa Słaby, Małgorzata Lempart‐Drozd, more

Geostandards and Geoanalytical Research > 46 > 2 > 277 - 306

Here we report on the oxygen isotope compositions of four proposed apatite reference materials (chlorapatite MGMH#133648 and fluorapatite specimens MGMH#128441A, MZ‐TH and ES‐MM). The samples were initially screened for ¹⁸O/¹⁶O homogeneity using secondary ion mass spectrometry (SIMS) followed by δ¹⁸O determinations in six gas source isotope ratio mass spectrometry laboratories (GS‐IRMS) using a variety...

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Simultaneous δ²H and δ¹⁸O analyses of water inclusions in halite with off‐axis integrated cavity output spectroscopy

François Fourel, Christophe Lécuyer, Patrick Jame, Alexandre Guironnet, more

Journal of Mass Spectrometry > 55 > 10 > n/a - n/a

Stable isotope compositions of ancient halite fluid inclusions have been recognized to be valuable tools for reconstructing past environments. Nevertheless, in order to better understand the genesis of halite deposits, it could be of great interest to combine both δ²H and δ¹⁸O measurements of the water trapped as inclusions in the defects of the mineral lattice. We developed a method combining off‐axis...

article

Models of innovation: The history of an idea

Christophe Lécuyer

Centaurus > 61 > 1-2 > 133 - 134

article

Synthesis of In‐House Produced Calibrated Silver Phosphate with a Large Range of Oxygen Isotope Compositions

Christophe Lécuyer, François Fourel, Magali Seris, Romain Amiot, more

Geostandards and Geoanalytical Research > 43 > 4 > 681 - 688

The large range of stable oxygen isotope values of phosphate‐bearing minerals and dissolved phosphate of inorganic or organic origin requires the availability of in‐house produced calibrated silver phosphate of which isotopic ratios must closely bracket those of studied samples. We propose a simple protocol to synthesise Ag₃PO₄ in a wide range of oxygen isotope compositions based on the equilibrium...

article

Improved online hydrogen isotope analysis of halite aqueous inclusions

François Fourel, Christophe Lécuyer, Magali Seris, Nigel Blamey, more

Journal of Mass Spectrometry > 54 > 4 > 342 - 350

We demonstrate an improved method based on continuous‐flow elemental analyser pyrolysis isotopic ratio mass spectrometry (CF‐EA‐PY‐IRMS) to measure the ²H/¹H ratios of water trapped in halite crystals. Two challenges to overcome are the low hydrogen concentration of samples (10‐50 μmol H₂·g⁻¹) and the high chloride concentration released when reacting halite in an elemental analyser. We describe an...

article

δ13C signal of earthworm calcite granules: A new proxy for palaeoprecipitation reconstructions during the Last Glacial in western Europe

Charlotte Prud'homme, Christophe Lécuyer, Pierre Antoine, Christine Hatté, more

Quaternary Science Reviews > 2018 > 179 > C > 158-166

Quantification of paleoprecipitation during the Last Glacial is a key element to reconstruct palaeoclimates. Recently, fossil calcite granules have been identified in loess sequences with high contents in specific horizons. In this study, we explored for the first time the potential of this new bio-indicator as a climatic proxy for precipitation in western Europe during the Last Glacial. We extracted...

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The Cenomanian-Turonian Boundary Event (CTBE) in northern Lebanon as compared to regional data – Another set of evidences supporting a short-lived tectonic pulse coincidental with the event?

Danièle Grosheny, Serge Ferry, Christophe Lecuyer, Yann Merran, more

Palaeogeography, Palaeoclimatology, Palaeoecology > 2017 > 487 > C > 447-461

Constrained by both foraminifera and isotope data, the Zeitoun and Nahr Ibrahim sections in northern Lebanon record a steady flooding of the Cenomanian carbonate platform during the uppermost Cenomanian-lower Turonian interval. The flooding began just before the inception of the CTBE δ¹³C positive shift. It is marked by the deposition of finely bedded to laminated, fine-grained limestone overlying...

article

²H/¹H measurements of amphiboles and nominally anhydrous minerals (clinopyroxene, garnet and diamond) using high‐temperature continuous flow elemental analyser/pyrolysis/isotope ratio mass spectrometry

François Fourel, Christophe Lécuyer, Attila Demeny, Philippe Boulvais, more

Rapid Communications in Mass Spectrometry > 31 > 24 > 2066 - 2072

Rationale We have used a high‐precision, high‐efficiency method for the measurement of the ²H/¹H ratios of hydrous silicates (amphiboles) and nominally anhydrous minerals (NAM) such as clinopyroxene, garnet and diamond, which are usually extremely resistant to pyrolysis. This opens up new fields of investigation to better understand the conditions of formation for deep‐Earth minerals. Methods The...

article

Miocene (Burdigalian) seawater and air temperatures estimated from the geochemistry of fossil remains from the Aquitaine Basin, France

Jean Goedert, Romain Amiot, Florent Arnaud-Godet, Gilles Cuny, more

Palaeogeography, Palaeoclimatology, Palaeoecology > 2017 > 481 > C > 14-28

Construction work of the Highway A65 led the top of the Burdigalian ‘Molasses de l'Armagnac’ Formation to outcrop in two close localities near the town of Bazas and Marimbault, situated on the western edge of the Aquitaine Basin, France. From this formation, a rich fossil assemblage has been recovered and includes both marine and terrestrial fossil remains which offered the opportunity to reconstruct...

article

δ¹⁸O‐derived incubation temperatures of oviraptorosaur eggs

Romain Amiot, Xu Wang, Shuo Wang, Christophe Lécuyer, more

Palaeontology > 60 > 5 > 633 - 647

In order to determine the incubation temperature of eggs laid by non‐avian dinosaurs, we analysed the oxygen isotope compositions of both eggshell carbonate (δ¹⁸O_c) and embryo bone phosphate (δ¹⁸O_p) from seven oviraptorosaur eggs with preserved in ovo embryo bones. These eggs come from the Upper Cretaceous Nanxiong Formation of Jiangxi Province, China. Oviraptorosaur theropods were selected because...

article

Carbon, nitrogen and oxygen isotope fractionation during food cooking: Implications for the interpretation of the fossil human record

Aurélien Royer, Valérie Daux, François Fourel, Christophe Lécuyer

American Journal of Physical Anthropology > 163 > 4 > 759 - 771

Objectives Stable isotope data provide insight into the reconstruction of ancient human diet. However, cooking may alter the original stable isotope compositions of food due to losses and modifications of biochemical and water components. Methods To address this issue, carbon, nitrogen and oxygen isotope ratios were measured on meat aliquots sampled from various animals such as pork, beef, duck...

article

Oxygen isotope fractionation between bird bone phosphate and drinking water

Romain Amiot, Delphine Angst, Serge Legendre, Eric Buffetaut, more

The Science of Nature > 2017 > 104 > 5-6 > 1-13

Oxygen isotope compositions of bone phosphate (δ¹⁸O_p) were measured in broiler chickens reared in 21 farms worldwide characterized by contrasted latitudes and local climates. These sedentary birds were raised during an approximately 3 to 4-month period, and local precipitation was the ultimate source of their drinking water. This sampling strategy allowed the relationship to be determined between...

article

The Cenomanian–Turonian Boundary Event (CTBE) on the southern slope of the Subalpine Basin (SE France) and its bearing on a probable tectonic pulse on a larger scale

Danièle Grosheny, Serge Ferry, Christophe Lécuyer, Audrey Thomas, more

Cretaceous Research > 2017 > 72 > C > 39-65

The Cenomanian–Turonian Boundary Event (CTBE) event is not associated with a transgression on the southern margin of the Subalpine Basin, but with a steady shallowing-up trend beginning in the lower half of the δ¹³C positive shift. The SW–NE Rouaine Fault had a complex role, first in isolating a black shale basin to the west and a large, deep submarine plateau devoid of black shale to the east, then...

article

Evolution of the carbon isotope composition of atmospheric CO2 throughout the Cretaceous

Abel Barral, Bernard Gomez, Serge Legendre, Christophe Lécuyer

Palaeogeography, Palaeoclimatology, Palaeoecology > 2017 > 471 > C > 40-47

Although atmospheric CO₂ has been extensively described as a primary driver of Phanerozoic climate and carbon cycle disturbance, little is known about its carbon isotope composition (δ¹³C_CO₂) during pre-Cenozoic times. We reconstruct for the first time the evolution of δ¹³C_CO₂ during the whole Cretaceous period based on reference curves of δ¹³C values of Tethyan marine bulk carbonates (δ¹³C_carb) and...

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D/H fractionation during the sublimation of water ice

Christophe Lécuyer, Aurélien Royer, François Fourel, Magali Seris, more

Icarus > 2017 > 285 > C > 1-7

Experiments of sublimation of pure water ice have been performed in the temperature range −105 °C to −30 °C and atmospheric partial pressures ranging from 10⁻⁶ to 10⁻¹mb. Sampling of both vapour and residual ice fractions has been performed with the use of a vacuum line designed for the extraction and purification of gases before the measurement of their D/H ratios. Sublimation was responsible for...

article

Cooling history of nested plutons from the Variscan Tichka plutonic complex (Morocco)

Christophe Lécuyer, Dominique Gasquet, Pascal Allemand, François Martineau, more

International Journal of Earth Sciences > 2017 > 106 > 8 > 2855-2872

Four imbricated mafic to felsic plutons of Variscan age from Morocco have been investigated for their cooling history and geochemical interactions with surrounding continental rocks. Oxygen isotope compositions of whole rocks and minerals have been used to model the cooling rates of these kilometer-sized intrusions. By combining both the knowledge of oxygen-self diffusion data of rock-forming minerals...

article

Analysing the representativeness of local‐scale palaeodiversity measurements: a case from the Lower Cretaceous plant assemblage of Hautrage (Mons Basin, Belgium)

Abel Barral, Bernard Gomez, Juan M. Zorrilla, José M. Serrano, more

Lethaia > 50 > 2 > 244 - 257

Two plant fossil‐bearing beds from the middle Barremian of Belgium were analysed to ascertain how experimental designs affect conclusions regarding palaeodiversity at a local scale. We analysed eight lateral samples per bed taken regularly every 3 m using an exhaustive sub‐sampling method. The Clench equation was used to evaluate the completeness of the taxonomic inventory of the samples and the sampling...

article

A high-resolution temporal record of environmental changes in the Eastern Caribbean (Guadeloupe) from 40 to 10 ka BP

Aurélien Royer, Bruno Malaizé, Christophe Lécuyer, Alain Queffelec, more

Quaternary Science Reviews > 2017 > 155 > C > 198-212

In neotropical regions, fossil bat guano accumulated over time as laminated layers in caves, hence providing a high-resolution temporal record of terrestrial environmental changes. Additionally, cave settings have the property to preserve such organic sediments from processes triggered by winds (deflation, abrasion and sandblasting) and intense rainfall (leaching away). This study reports both stable...

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Oxygen isotope fractionation between bird eggshell calcite and body water: application to fossil eggs from Lanzarote (Canary Islands)

Nicolas Lazzerini, Christophe Lécuyer, Romain Amiot, Delphine Angst, more

The Science of Nature > 2016 > 103 > 9-10 > 1-15

Oxygen and carbon isotope compositions of fossil bird eggshell calcite (δ¹⁸O_calc and δ¹³C_calc) are regularly used to reconstruct paleoenvironmental conditions. However, the interpretation of δ¹⁸O_calc values of fossil eggshells has been limited to qualitative variations in local climatic conditions as oxygen isotope fractionations between calcite, body fluids, and drinking water have not been determined...

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Search results for: Christophe Lécuyer

Geographic origin and social status of the Gallic warriors from Ribemont‐sur‐Ancre (France) studied through isotope systematics of bone remains

Inter‐laboratory Characterisation of Apatite Reference Materials for Oxygen Isotope Analysis and Associated Methodological Considerations

Simultaneous δ²H and δ¹⁸O analyses of water inclusions in halite with off‐axis integrated cavity output spectroscopy

Models of innovation: The history of an idea

Synthesis of In‐House Produced Calibrated Silver Phosphate with a Large Range of Oxygen Isotope Compositions

Improved online hydrogen isotope analysis of halite aqueous inclusions

δ13C signal of earthworm calcite granules: A new proxy for palaeoprecipitation reconstructions during the Last Glacial in western Europe

The Cenomanian-Turonian Boundary Event (CTBE) in northern Lebanon as compared to regional data – Another set of evidences supporting a short-lived tectonic pulse coincidental with the event?

²H/¹H measurements of amphiboles and nominally anhydrous minerals (clinopyroxene, garnet and diamond) using high‐temperature continuous flow elemental analyser/pyrolysis/isotope ratio mass spectrometry

Miocene (Burdigalian) seawater and air temperatures estimated from the geochemistry of fossil remains from the Aquitaine Basin, France

δ¹⁸O‐derived incubation temperatures of oviraptorosaur eggs

Carbon, nitrogen and oxygen isotope fractionation during food cooking: Implications for the interpretation of the fossil human record

Oxygen isotope fractionation between bird bone phosphate and drinking water

The Cenomanian–Turonian Boundary Event (CTBE) on the southern slope of the Subalpine Basin (SE France) and its bearing on a probable tectonic pulse on a larger scale

Evolution of the carbon isotope composition of atmospheric CO2 throughout the Cretaceous

D/H fractionation during the sublimation of water ice

Cooling history of nested plutons from the Variscan Tichka plutonic complex (Morocco)

Analysing the representativeness of local‐scale palaeodiversity measurements: a case from the Lower Cretaceous plant assemblage of Hautrage (Mons Basin, Belgium)

A high-resolution temporal record of environmental changes in the Eastern Caribbean (Guadeloupe) from 40 to 10 ka BP

Oxygen isotope fractionation between bird eggshell calcite and body water: application to fossil eggs from Lanzarote (Canary Islands)

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