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Christine Authemayou - One of the best experts on this subject based on the ideXlab platform.
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Structural Inheritance and coastal geomorphology in sw brittany france an onshore offshore integrated approach
Geomorphology, 2018Co-Authors: Celine Raimbault, Anne Duperret, Bernard Le Gall, Christine AuthemayouAbstract:Abstract The Variscan crystalline basement exposed along the SW Brittany coast recorded extensive long-term planation processes during Mesozoic times. Detailed onshore-offshore mapping (600 km2) in the Penmarc’h-Concarneau granitic coastal area reveals a km-scale, deeply fractured submarine rocky shelf. High-resolution offshore imagery (bathymetry and seismic reflection dataset), combined to Structural field investigations, on these surfaces allow us to identify a preserved network of both ductile and brittle structures. The inherited fault pattern is dominated by the N160°E-trending and long-lived Concarneau-Toulven fault zone (CTFS) that separates two distinct morphoStructural blocks, and strongly influences the seaward limit of the Concarneau submarine rocky shelf, as well as the linear coastline of the Concarneau embayment. The Structural imprint of the CTFS decreases progressively westwards with respect to a composite network of large-scale N50°E- and N140°E-oriented faults bounding the seaward edge of the Penmarc’h rocky shelf. The latter in turn splits into three large-scale blocks along N50°E- (La Torche Fault – LTF), N140°E- (Saint Guenole Fault – SGF) and N160°E-trending normal faults. The morphoStructural evolutionary model applied here to the Penmarc’h-Concarneau granitic coastal area resulted from the combined effects of Structural Variscan Inheritance and post-Variscan tectonics. Paleo-stress analysis of striated fault planes indicates three main Cenozoic tectonic events, inferred to have operated from Eocene to post-Oligocene times. The 3D-architecture of the Concarneau embayment, as a rocky shelf partially sealed with quaternary sediments, chiefly resulted from the reactivation of the CTFS during Eocene and Oligocene times. Further west, the surface of the Penmarc’h rocky shelf was tilted southeastward by the brittle reactivation of the LTF, and dissected by a horst-graben network post-Oligocene in age. The present-day morphology of the Penmarc’h and Concarneau domains depends on distinct driving processes: the Concarneau N160°E coastline is clearly controlled by tectonic processes via the CTFS, while the Penmarc’h headland land-sea contact appears to have been shaped by post-Cenozoic eustatism.
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Structural Inheritance and coastal geomorphology in SW Brittany, France: An onshore/offshore integrated approach
Geomorphology, 2018Co-Authors: Celine Raimbault, Anne Duperret, Bernard Le Gall, Christine AuthemayouAbstract:Abstract The Variscan crystalline basement exposed along the SW Brittany coast recorded extensive long-term planation processes during Mesozoic times. Detailed onshore-offshore mapping (600 km2) in the Penmarc’h-Concarneau granitic coastal area reveals a km-scale, deeply fractured submarine rocky shelf. High-resolution offshore imagery (bathymetry and seismic reflection dataset), combined to Structural field investigations, on these surfaces allow us to identify a preserved network of both ductile and brittle structures. The inherited fault pattern is dominated by the N160°E-trending and long-lived Concarneau-Toulven fault zone (CTFS) that separates two distinct morphoStructural blocks, and strongly influences the seaward limit of the Concarneau submarine rocky shelf, as well as the linear coastline of the Concarneau embayment. The Structural imprint of the CTFS decreases progressively westwards with respect to a composite network of large-scale N50°E- and N140°E-oriented faults bounding the seaward edge of the Penmarc’h rocky shelf. The latter in turn splits into three large-scale blocks along N50°E- (La Torche Fault – LTF), N140°E- (Saint Guenole Fault – SGF) and N160°E-trending normal faults. The morphoStructural evolutionary model applied here to the Penmarc’h-Concarneau granitic coastal area resulted from the combined effects of Structural Variscan Inheritance and post-Variscan tectonics. Paleo-stress analysis of striated fault planes indicates three main Cenozoic tectonic events, inferred to have operated from Eocene to post-Oligocene times. The 3D-architecture of the Concarneau embayment, as a rocky shelf partially sealed with quaternary sediments, chiefly resulted from the reactivation of the CTFS during Eocene and Oligocene times. Further west, the surface of the Penmarc’h rocky shelf was tilted southeastward by the brittle reactivation of the LTF, and dissected by a horst-graben network post-Oligocene in age. The present-day morphology of the Penmarc’h and Concarneau domains depends on distinct driving processes: the Concarneau N160°E coastline is clearly controlled by tectonic processes via the CTFS, while the Penmarc’h headland land-sea contact appears to have been shaped by post-Cenozoic eustatism.
Zejin Yang - One of the best experts on this subject based on the ideXlab platform.
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Structural Inheritance and difference between ti2alc ti3alc2 and ti5al2c3 under pressure from first principles
Modern Physics Letters B, 2017Co-Authors: An Du, Zejin YangAbstract:The Structural Inheritance and difference between Ti2AlC, Ti3AlC2 and Ti5Al2C3 under pressure from first principles are studied. The results indicate that the lattice parameter a are almost the same within Ti2AlC, Ti3AlC2 and Ti5Al2C3, and the value of c in Ti5Al2C3 is the sum of Ti2AlC and Ti3AlC2 which is revealed by the covalently bonded chain in the electron density difference: Al–Ti–C–Ti–Al for Ti2AlC, Al–Ti2–C–Ti1–C–Ti2–Al for Ti3AlC2 and Al–Ti3–C2–Ti3–Al–Ti2–C1–Ti1–C1–Ti2–Al for Ti5Al2C3. The calculated axial compressibilities, volumetric shrinkage, elastic constant c11, c33/c11 ratio, bulk modulus, shear modulus, and Young’s modulus of Ti5Al2C3 are within the range of the end members (Ti2AlC and Ti3AlC2) in a wide pressure range of 0–100 GPa. Only Ti2AlC is isotropic crystal at about 50 GPa within the Ti–Al–C compounds. All of the Ti 3d density of states curves of the three compounds move from lower energy to higher energy level with pressure increasing. The similarities of respective bond length, bond overlap population (Ti–C, Ti–Al and Ti–Ti), atom Mulliken charges under pressure as well as the electron density difference for the three compounds are discovered. Among the Ti–Al–C ternary compounds, Ti–Ti bond behaves least compressibility, whereas the Ti–Al bond is softer than that of Ti–C bonds, which can also been confirmed by the density of states and electron density difference. Bond overlap populations of Ti–Ti, Ti–C and Ti–Al indicate that the ionicity interaction becomes more and more stronger in the three structures as the pressure increasing. Mulliken charges of Ti1, Ti2, Ti3, C and Al are 0.65, 0.42, 0.39, −0.73, −0.04 at 0 GPa, respectively, which are consistent with the Pauling scale.
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Structural Inheritance and difference between Ti2AlC, Ti3AlC2 and Ti5Al2C3 under pressure from first principles
Modern Physics Letters B, 2017Co-Authors: An Du, Zejin YangAbstract:The Structural Inheritance and difference between Ti2AlC, Ti3AlC2 and Ti5Al2C3 under pressure from first principles are studied. The results indicate that the lattice parameter a are almost the same within Ti2AlC, Ti3AlC2 and Ti5Al2C3, and the value of c in Ti5Al2C3 is the sum of Ti2AlC and Ti3AlC2 which is revealed by the covalently bonded chain in the electron density difference: Al–Ti–C–Ti–Al for Ti2AlC, Al–Ti2–C–Ti1–C–Ti2–Al for Ti3AlC2 and Al–Ti3–C2–Ti3–Al–Ti2–C1–Ti1–C1–Ti2–Al for Ti5Al2C3. The calculated axial compressibilities, volumetric shrinkage, elastic constant [Formula: see text], [Formula: see text] ratio, bulk modulus, shear modulus, and Young’s modulus of Ti5Al2C3 are within the range of the end members (Ti2AlC and Ti3AlC2) in a wide pressure range of 0–100 GPa. Only Ti2AlC is isotropic crystal at about 50 GPa within the Ti–Al–C compounds. All of the Ti 3d density of states curves of the three compounds move from lower energy to higher energy level with pressure increasing. The similarities of respective bond length, bond overlap population (Ti–C, Ti–Al and Ti–Ti), atom Mulliken charges under pressure as well as the electron density difference for the three compounds are discovered. Among the Ti–Al–C ternary compounds, Ti–Ti bond behaves least compressibility, whereas the Ti–Al bond is softer than that of Ti–C bonds, which can also been confirmed by the density of states and electron density difference. Bond overlap populations of Ti–Ti, Ti–C and Ti–Al indicate that the ionicity interaction becomes more and more stronger in the three structures as the pressure increasing. Mulliken charges of Ti1, Ti2, Ti3, C and Al are 0.65, 0.42, 0.39, −0.73, −0.04 at 0 GPa, respectively, which are consistent with the Pauling scale.
Jan Golonka - One of the best experts on this subject based on the ideXlab platform.
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variscan deformation along the teisseyre tornquist zone in se poland thick skinned Structural Inheritance or thin skinned thrusting
Tectonophysics, 2017Co-Authors: Piotr Krzywiec, łukasz Gągala, Stanislaw Mazur, łukasz Slonka, Mateusz Kufrasa, M Malinowski, Kaja Pietsch, Jan GolonkaAbstract:Abstract Recently acquired seismic reflection data provide better insight in the Structural style of extensive sedimentary series overlying the SW slope of the East European Craton (EEC) in Poland. The two main seismic datasets – the POLCRUST-01 profile and PolandSPAN survey – yielded contrasting thick – and thin-skinned Structural models for the same Structural units in SE Poland. We reattempt an interpretation of the POLCRUST-01 profile using techniques of cross-section balancing and restoration aided by 2D forward seismic modelling. An outcome is the thin-skinned Structural model is. This solution relies on a continuous top of the EEC crystalline basement well represented in the seismic data as well as on fragmentary, yet conclusive seismic geometries in shallow depth intervals proving the Ediacaran-Palaeozoic series to be thrust and folded. A Variscan (late Carboniferous) compressional regime is consequently invoked to explain thin-skinned structuring of the pre-Permian sedimentary pile and > 20 km of calculated shortening. We demonstrate an ambiguous nature of the top-basement irregularities previously used as indicators of basement-rooted vertical faulting. The tilt and abrupt increase of the top-basement taper under the thin-skinned belt are attributed to pre-Ordovician tectonic processes operating along the SW margin of the EEC. Post-rift subsidence and/or flexural loading giving rise to a broken foreland plate are invoked.
Olivier Lacombe - One of the best experts on this subject based on the ideXlab platform.
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Structural Inheritance and cenozoic stress fields in the Jura fold-and-thrust belt (France)
Tectonophysics, 2020Co-Authors: Catherine Homberg, Francoise Bergerat, Y Philippe, Olivier Lacombe, Jacques AngelierAbstract:Tectonophysics, v. 357, n. 1-4, p. 137-158, 2002. http://dx.doi.org/10.1016/S0040-1951(02)00366-9International audienc
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influence of Structural Inheritance on foreland foredeep system evolution an example from the po valley region northern italy
Marine and Petroleum Geology, 2016Co-Authors: Claudio Turrini, Olivier Lacombe, Giovanni Toscani, Francois RoureAbstract:Understanding the development of foreland-foredeep systems and the influence exerted by pre-existing structures on their evolution is an important step for defining the key factors that control long-term basin and lithosphere dynamics, comprehending the associated seismic hazard and assessing their economic potential in the domain of hydrocarbon exploration. The Po Valley is a rather unique foreland basin for two major reasons: a) it developed intermittently at the front of two different mountain chains, the Northern Apennines and the Southern Alps, progressively converging one towards the other; b) the inherited structures, mainly derived from the Mesozoic extensional tectonics, are oriented at high angle to the advancing belts. The coexistence of these two factors and their various implications make the Po Valley basin a complex case study that deserves attention. Taking advantage of the recent building of a 3D Structural model across the region, we reconstructed the possible geometry and migration pattern of the Tertiary basins that developed at the front of the Northern Apennines and the Southern Alps, as part of the Po Valley tectonic evolution. In addition, a number of sections sliced from the 3D model across selected domains have then been used to restore the present-day Structural units to their pre-compressional setting, while highlighting the key stages of their geological history. Results from the model analysis show that the Mesozoic extension-related tectonics and the associated carbonate facies geometry and distribution localized and constrained the Alpine structures inside/around the basin. Their control on the Cenozoic deformation and sedimentation is evident during the Paleogene and the Miocene whereas it becomes more subtle during the Plio-Pleistocene when lithospheric-scale mechanisms need to be invoked. Notwithstanding the model uncertainties and its explicit regional significance, our results may be taken as reference for any foreland-foredeep setting worldwide, especially in complex systems where tectono-sedimentary inhomogeneity is spatially and temporally dominant.
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Structural Inheritance and cenozoic stress fields in the jura fold and thrust belt france
Tectonophysics, 2002Co-Authors: Catherine Homberg, Francoise Bergerat, Y Philippe, Olivier Lacombe, Jacques AngelierAbstract:Abstract Based on an analysis of 8000 minor fault-slip data in the Jura Mountains (France), we discuss the influence of pre-existing discontinuities on the development of fold-and-thrust belts. We present palinspastic maps showing the stress fields and active faults during the Cenozoic pre-orogenic events in the Jura belt prior to the main Late Miocene fold-and-thrust tectonics. During the Eocene, a N–S strike-slip regime produced a few NNE–SSW sub-vertical strike-slip faults in the central external Jura and a few E–W reverse faults in the eastern Jura near the future frontal thrust. During the Oligocene, an average WNW–ESE extension, with irregular stress trajectories, resulted in normal faulting along N–S to NE–SW trends in the external part of the belt, WNW–ESE trends along the future northern and northeastern frontal thrust, and NW–SE trends in the internal Jura. The Late Miocene tectonics began with a strike-slip regime with a fan-shaped compressional trajectory. It was followed by a stress field with similar stress direction, but local σ 2 / σ 3 stress permutation resulted in strike-slip regime domains contrasting with reverse regime domains. Stress deflections and permutations occurred near inherited cover and basement discontinuities. Major deformation zones, like the Jura frontal thrust onto the foreland, the thrust of the internal central Jura onto the external Jura, and the narrow deformation bands within the flat-lying plateaus formed close to the inherited faults. The Structural style of the Jura belt thus partly mimics the pre-orogenic fault pattern. Stress deflections point to the pre-orogenic faults, express the indentation process of the Jura by its hinterland, and highlight successive slip events along major faults during the fold-and-thrust tectonics. This case study illustrates the relevance of minor fault-slip studies for characterizing both the pre-orogenic tectonics and the kinematics of the deformation.
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Tectogenèse pyrénéenne dans le bassin flexural d'Aquitaine: apports de la reconstitution de paléocontraintes
Comptes Rendus De L Academie Des Sciences Serie Ii Fascicule A-sciences De La Terre Et Des Planetes, 2000Co-Authors: Muriel Rocher, Olivier Lacombe, Jacques AngelierAbstract:Abstract Paleostress reconstructions based on analyses of fault slips and mechanical calcite twins highlight the Cenozoic Structural evolution of the Aquitaine basin. The pyrenean phase, from the Late Cretaceous to the Oligocene, corresponds to a N020 compression, responsible for the development of N110 trending folds, locally deviated near N160 ramps. Later, the compression turned to N160. Nearly east-west extensions, probably resulting from stress permutations, produced north-south normal faults. This tectonic evolution, dominated by a north-south compression, is apparently polyphase because of Structural Inheritance and salt tectonics.
Celine Raimbault - One of the best experts on this subject based on the ideXlab platform.
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Structural Inheritance and coastal geomorphology in sw brittany france an onshore offshore integrated approach
Geomorphology, 2018Co-Authors: Celine Raimbault, Anne Duperret, Bernard Le Gall, Christine AuthemayouAbstract:Abstract The Variscan crystalline basement exposed along the SW Brittany coast recorded extensive long-term planation processes during Mesozoic times. Detailed onshore-offshore mapping (600 km2) in the Penmarc’h-Concarneau granitic coastal area reveals a km-scale, deeply fractured submarine rocky shelf. High-resolution offshore imagery (bathymetry and seismic reflection dataset), combined to Structural field investigations, on these surfaces allow us to identify a preserved network of both ductile and brittle structures. The inherited fault pattern is dominated by the N160°E-trending and long-lived Concarneau-Toulven fault zone (CTFS) that separates two distinct morphoStructural blocks, and strongly influences the seaward limit of the Concarneau submarine rocky shelf, as well as the linear coastline of the Concarneau embayment. The Structural imprint of the CTFS decreases progressively westwards with respect to a composite network of large-scale N50°E- and N140°E-oriented faults bounding the seaward edge of the Penmarc’h rocky shelf. The latter in turn splits into three large-scale blocks along N50°E- (La Torche Fault – LTF), N140°E- (Saint Guenole Fault – SGF) and N160°E-trending normal faults. The morphoStructural evolutionary model applied here to the Penmarc’h-Concarneau granitic coastal area resulted from the combined effects of Structural Variscan Inheritance and post-Variscan tectonics. Paleo-stress analysis of striated fault planes indicates three main Cenozoic tectonic events, inferred to have operated from Eocene to post-Oligocene times. The 3D-architecture of the Concarneau embayment, as a rocky shelf partially sealed with quaternary sediments, chiefly resulted from the reactivation of the CTFS during Eocene and Oligocene times. Further west, the surface of the Penmarc’h rocky shelf was tilted southeastward by the brittle reactivation of the LTF, and dissected by a horst-graben network post-Oligocene in age. The present-day morphology of the Penmarc’h and Concarneau domains depends on distinct driving processes: the Concarneau N160°E coastline is clearly controlled by tectonic processes via the CTFS, while the Penmarc’h headland land-sea contact appears to have been shaped by post-Cenozoic eustatism.
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Structural Inheritance and coastal geomorphology in SW Brittany, France: An onshore/offshore integrated approach
Geomorphology, 2018Co-Authors: Celine Raimbault, Anne Duperret, Bernard Le Gall, Christine AuthemayouAbstract:Abstract The Variscan crystalline basement exposed along the SW Brittany coast recorded extensive long-term planation processes during Mesozoic times. Detailed onshore-offshore mapping (600 km2) in the Penmarc’h-Concarneau granitic coastal area reveals a km-scale, deeply fractured submarine rocky shelf. High-resolution offshore imagery (bathymetry and seismic reflection dataset), combined to Structural field investigations, on these surfaces allow us to identify a preserved network of both ductile and brittle structures. The inherited fault pattern is dominated by the N160°E-trending and long-lived Concarneau-Toulven fault zone (CTFS) that separates two distinct morphoStructural blocks, and strongly influences the seaward limit of the Concarneau submarine rocky shelf, as well as the linear coastline of the Concarneau embayment. The Structural imprint of the CTFS decreases progressively westwards with respect to a composite network of large-scale N50°E- and N140°E-oriented faults bounding the seaward edge of the Penmarc’h rocky shelf. The latter in turn splits into three large-scale blocks along N50°E- (La Torche Fault – LTF), N140°E- (Saint Guenole Fault – SGF) and N160°E-trending normal faults. The morphoStructural evolutionary model applied here to the Penmarc’h-Concarneau granitic coastal area resulted from the combined effects of Structural Variscan Inheritance and post-Variscan tectonics. Paleo-stress analysis of striated fault planes indicates three main Cenozoic tectonic events, inferred to have operated from Eocene to post-Oligocene times. The 3D-architecture of the Concarneau embayment, as a rocky shelf partially sealed with quaternary sediments, chiefly resulted from the reactivation of the CTFS during Eocene and Oligocene times. Further west, the surface of the Penmarc’h rocky shelf was tilted southeastward by the brittle reactivation of the LTF, and dissected by a horst-graben network post-Oligocene in age. The present-day morphology of the Penmarc’h and Concarneau domains depends on distinct driving processes: the Concarneau N160°E coastline is clearly controlled by tectonic processes via the CTFS, while the Penmarc’h headland land-sea contact appears to have been shaped by post-Cenozoic eustatism.
