The electronic band structure of titanium dioxide is calculated by a combined tight-binding and pseudopotential method in order to interpret the numerous experimental data. gap anisotropy clearly shown values parallel perpendicular gaps are good agreement with measured ones.

Abstract Key questions in fault reactivation shales relate to the potential for enhanced fluid transport through previously low‐permeability aseismic formations. Here we explore behavior of a 20 m long N0‐to‐170°, 75‐to‐80°W that is critically stressed under strike‐slip regime ( σ 1 = 4 ± 2 MPa, horizontal and N162° 15°E, 3.8 0.4 MPa 3 2.1 respectively 7–8° inclined from vertical N72°). The was reactivated by pressurization borehole using straddle packer system isolating 2.4 injection...

Abstract Conventional triaxial tests were performed on three sets of samples Tournemire shale along different orientations relative to bedding (0°, 45°, and 90°). Experiments carried out up failure at increasing confining pressures ranging from 2.5 160 MPa, strain rates between 3 × 10 −7 s −1 −5 . This allowed us determine the entire anisotropic elastic compliance matrix as a function pressure. Results show that orientation principal stress plays an important role brittle strength, with 45°...

Abstract Conventional triaxial tests were performed on a series of samples Tournemire shale along different orientations relative to bedding (0°, 90°). Experiments carried out up failure at increasing confining pressures ranging from 2.5 80 MPa, and strain rates between 3 × 10 −7 s −1 −5 . During each experiment, P S wave elastic velocities continuously measured many raypaths with respect maximum compressive stress. This extensive velocity measurement setup allowed us highlight the presence...

Understanding the internal structure of intra-salt layers within deformed salt bodies is crucial for geo-energy storage in salt-bearing basins. This study integrates high-resolution 2D finite element numerical modelling to explore how variations stratigraphy, lithological heterogeneity, and post-salt sedimentation patterns influence deformation processes architecture diapiric structures across different basin geometries. Specifically, we examine impact variability by systematically varying...

The electronic band structures of magnesium and calcium oxides are calculated by a combined tight-binding pseudopotential method; we show the possibility having two excitonic transitions in CaO one MgO, which is agreement with experimental results. We also propose an interpretation other

The electronic band structures of calcium and cadmium fluoride are calculated by a combined tight-binding pseudopotential method. overall shape the valence bands is found to be same in these two compounds agrees quite well with "universal valence-band structure" for fluorite structure. Yet it that excited cationic $d$ states lie too high conduction band. It then shown simple semiempirical modification model coherent interpretation optical spectra crystals can proposed.

Abstract. Conceptual models of orogenic accretionary prisms assume that peak temperatures (Tmax⁡) increase towards the internal domains as crustal rocks are accreted from lower to upper plate. However, recognition pre-orogenic heating events in mountain belts questions magnitude thermal overprint during nappe stacking. Using Raman spectroscopy on carbonaceous material (RSCM) calculate Tmax⁡, we have investigated record Lower Jurassic Eocene strata exposed along six stratigraphic sections at...

The electronic band structure of Ca${\mathrm{F}}_{2}$ is calculated by a mixed tight-binding orthogonalized-plane-wave method. method includes the calculation three-center terms and plane waves are then orthogonalized to occupied levels. exchange potential Slater form together with scaling parameter $\ensuremath{\lambda}$ adjusted gap. obtained found differ significantly that previously proposed empirical schemes. Comparison made photoemission optical data agreement good.

Afin d'interpréter les nombreux résultats expérimentaux existants, nous avons calculé la structure des bandes d'énergie du fluorure de magnésium en combinant méthode liaisons fortes avec celle pseudopotentiel.L'anisotropie gap optique est mise évidence et largeur interdites lumière parallèle perpendiculaire bon accord l'expérience : proposons également une interprétation pour un certain nombre d'autres transitions expérimentales.

de niveau recherche, publiés ou non, émanant des établissements d'enseignement et recherche français étrangers, laboratoires publics privés.

Stylolites are pressure solution structures, the roughness of which yields quantitative information about magnitude normal stress applied to stylolite plane. The is calculated from cross over length (Lc) determined using signal analysis a 2D track. For sedimentary, bedding-parallel (BPS), Lc scales vertical maximum principal σ1, hence burial depth at time froze. We present dataset nearly 200 BPS Meso-Cenozoic folded carbonates across Umbria Marche Apennine Ridge. population used address...

Abstract The thick late syn‐ to early post‐rift shallow water evaporites in the most distal part of wide rifted margins is paradoxical with deep depression at crustal breakup time predicted by isostatically compensated lithospheric thinning. Elevation margin and depth during deposition syn‐rift central South Atlantic are not well constrained remain be quantified. We use forward 2‐D thermo‐mechanical modeling coupled melt prediction surface processes assess contribution mantle on topography...

Abstract Phyllosilicate content and related permeability of fault zones form primary controls on hydraulic mechanical behavior the brittle crust. Hence, understanding predicting localization these ubiquitous minerals is a major issue for fundamental applied geosciences. We describe normal cutting foreland arkosic turbiditic formation suffering high‐T diagenesis formed under conditions (~200°C) typical deeply buried reservoirs common within seismogenic interval. Microstructural analyses show...

SUMMARY Faults in general, and clay materials particular, have complex structures that can be linked to both a polyphased tectonic history the anisotropic nature of intact rock. Drilling through faults shaly allows measuring properties such as structure, mineralogical composition, stress orientation physical properties. We combine different petrophysical measurements on core samples retrieved from borehole drilled perpendicularly fault zone affecting Toarcian shales Tournemire underground...

In recent decades, geodynamic modelers have aimed to comprehend key factors governing continental rifting, such as the extension rate, lithospheric thickness, Moho mechanical coupling, and mantle convection's thermal influence. While prior models offered insights into rifting processes, they lacked calibration specific Earth regions. Introducing heterogeneities model does in some cases help calibrate simulation results a geological data from region. Acknowledging structural inheritance form...

During fluid injection tests performed inside the clay-rich Tournemire fault zone, monitored displacement exhibited limited amplitudes whereas a sharp increase of permeability occurred as pressure reached threshold value. The injected channeled through fractured zone or at interface between host rock and core over decameter distances without triggering large irreversible deformation zone. To assess underlying hydro-mechanical mechanisms this sudden permeability, numerical model was set up to...