Xavier Mangenot

Centre Européen de Recherche et d’Enseignement des Géosciences de l’Environnement, French National Centre for Scientific Research | CEREGE · Climate

The reconstruction of past diagenetic conditions in sedimentary basins is often under-constrained. This results from both the analytical challenge of performing the required analyses on the minute sample amounts available from diagenetic mineral phases and the lack of tracers for some of the diagenetic parameters. The carbonate clumped isotopes the...

O and δD of fluid inclusions in carbonates provide insights into temperatures and fluid chemical compositions prevailing during the carbonate precipitation, however various analytical restrictions limit a wider application of this proxy. This paper presents a new fluid inclusions isotopic analytical line coupled to an online cavity ring-down spectr...

Assessing the thermal evolution of sedimentary basins is critical for understanding the origin of natural resources (including ores, geothermal fluids or hydrocarbons) and for deciphering larger-scale tectonic and geodynamic evolutions. Modern reconstructions of past subsurface temperatures mostly rely on thermo-chronometers that are not applicable...

Petroleum-bearing fluid inclusions are small encapsulations of oil and gas that persist in the rock record long after their parent fluids have moved on. The chemical and isotopic compositions of inclusions offer a unique way to investigate hydrocarbon formation pathways in deep Earth environments and in ancient geological times. Here we use stable...

Understanding fault activity over time provides valuable insights for reconstructing the tectonic history of an orogen, assessing seismological risks and understanding mineralization processes. In the Western Alps, one of the main controversies in existing tectonic models is the understanding of syn-orogenic extension. Seismological evidence shows...

Syn-rift extensional faults play a significant role during the early stage of rifting.Constraining the age of faulting, and how and when deformation shifts from theproximal to the distal margin areas, is crucial for the reconstruction of the riftingprocess. Previous assessments of the structural and temporal evolution of rift-relatedfaults of the A...

The process of recrystallization affecting dolomitic successions remains a longstanding enigma in carbonate research. Recrystallization influences the accuracy of genetic dolomitization models as well as the prediction of porosity and permeability distribution within dolomitic reservoirs. We investigate early-formed dolomites of the Upper Jurassic...

We present a method for measuring the clumped isotope composition of molecular hydrogen (H2) using a high-resolution mass spectrometer, the Thermo 253 Ultra, improved to address subtle artifacts arising from instrument baselines and non-linear responses. We also present methods for purification and concentration of H2 from natural and experimental...

The age of brittle deformation in the superficial part of orogens is generally constrained by relative, cross-cutting structural relationships. However, it becomes possible to decipher the timing of fault activity by a combination of methods based on U-Pb dating and stable isotope composition of calcite-filled fault and veins. This methodology is a...

Jurassic carbonate strata in the eastern Paris Basin exhibit several generations of faults, tension gashes and stylolites. Although their relative chronology can sometimes be determined according to cross-cutting relationships, the duration of major deformation phases and their influence on fluid flow and carbonate cementation are still uncertain....

U-Pb dating and geochemical analyses (δ18O, δ13C, Δ47, 87Sr/86Sr and elemental composition) have been applied to fracture-filling calcite veins and host carbonates from the Bóixols-Sant Corneli anticline, which developed along the front of the Bóixols thrust sheet in the Southern Pyrenees. This robust dataset is used to determine: (i) the absolute...

This study integrates field structural data, petrographic and geochemical (δ¹⁸O, δ¹³C, Δ47, ⁸⁷Sr/⁸⁶Sr, and elemental composition) analyses and U–Pb dating of calcite veins cutting the Bóixols-Sant Corneli anticline (Southern Pyrenees) in order to date and to investigate the spatio-temporal relationships between fluid flow and fold evolution. This E...

Increased use and improved methodology of carbonate clumped isotope thermometry has greatly enhanced our ability to interrogate a suite of Earth‐system processes. However, inter‐laboratory discrepancies in quantifying carbonate clumped isotope (Δ₄₇) measurements persist, and their specific sources remain unclear. To address inter‐laboratory differe...

Naturally occurring hydrocarbon fluids in sedimentary basins have economic, geological and environmental significance. Connecting sedimentary basin temperature-time evolution with petroleum generation and transformation is a long-studied problem. In this study, we investigate the use of a novel tool – multiply substituted isotopologues of methane,...

With the development of unconventional resources, the large number and high density of well data in the deep/distal part of sedimentary basins offer new avenues for petroleum system analysis. Gas geochemistry is a widespread and inexpensive data that can provide invaluable information to better understand unconventional plays. This paper illustrate...

Hydrocarbon-bearing fluids trapped as inclusions can be regarded as time capsules of geofluids and are invaluable for understanding the evolution and migration of petroleum in sedimentary basins. These fluid inclusions can be studied using microthermometric methods to approximate the minimum inclusion trapping temperature and pressure and the gross...

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...

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...

Diagenesis studies of both siliciclastic and carbonate rocks face the challenge of constraining the temperature and age of the successive episodes of mineral crystallization. The first objective of this PhD work was to test the potential of two recently developed isotopic tools (the "clumped isotopes" ∆47 geothermometer and the laser ablation U-Pb...

Dans l’étude de la diagenèse des formations silico-clastiques ou carbonatées, il est souvent difficile de contraindre la température et l’âge des différents épisodes de cimentation ou de recristallisation. Le premier objectif de ce travail de thèse était de tester le potentiel de deux outils isotopiques récents (le géothermomètre des « clumpedisoto...

The characterization of the thermal evolution of a sedimentary basin is a milestone for understanding the origin of natural resources (including ores, geothermal energy or hydrocarbons) and for describing large-scale tectonic and geodynamic evolutions. Modern reconstruction of subsurface temperatures mostly relies on various thermo-chronometers suc...

Providing absolute time constraints on diagenetic events remain a challenge that would be very promising to characterize the chronology of reservoir quality development relative to trap formation, petroleum catagenesis and migration. In diagenetic studies, it is common practice to establish a paragenetic sequence that places the petrographically ob...