1,721,141 research outputs found
<i>Editorial Note</i><br><br>A case of plagiarism: "Modelling of the wave fields by the modification of the matrix method in anisotropic media" published in Solid Earth Discuss., 6, 1–19, 2014
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Brittle deformation of the Beacon and Ferrar rocks in the Eisenhower Range-Deep Freeze Range area, northern Victoria Land, Antarctica
No full textSpazi e tempi della guerra nel Mezzogiorno aragonese. L'itinerario militare di re Ferrante (1458-1465)
No full textVolume di 284 pp., scritto a quattro mani
Role of the mechanical stratigraphy on the evolution of experimental thrust-related folds.
No full textSpazi e tempi della guerra nel Mezzogiorno aragonese. L'itinerario militare di re Ferrante (1458-1465)
No full textVolume di 284 pp., scritto a quattro mani
The evolution of a model trap in the central Apennines, Italy: Fracture patterns, fault reactivation and development of cataclastic rocks in carbonates at the Narni Anticline
No full textRecent hydrocarbon discoveries in the Southern Apennines of Italy have focussed attention on the importance of studying fracturing and cataclasis in carbonate rocks because of their fundamental impact on reservoir permeability and connectivity. The Narni Anticline in the central Apennines consists of a stack of easterly-verging carbonate thrust sheets compartmentalized by extensional and strike-slip fault zones. The structure provides a field analogue for studying the evolution of superimposed fold- and fault-related fractures in carbonate reservoir rocks. The fracture pattern at the Narni Anticline developed as a result of three mechanisms: (a) layer-parallel shortening predating folding and faulting; (b) thrust-related folding and further thrust breakthrough; and (c) extensional and strike-slip faulting. Along-strike (longitudinal) fractures developed during progressive rollover fault-propagation folding, and their intensity depends on the precise structural position within the fold: fracture intensity is high in the forelimb and low in the crest. The 3-D architecture of the mechanical anisotropy associated with thrusting, folding, and related fracturing constrained the location and geometry of subsequent extensional and strike-slip faulting. The superimposition in damage zones of a fault-related cleavage on the pre-existing fracture pattern, which is associated with layer-parallel shortening and thrust-related folding, resulted in rock fragmentation and comminution, and the development of cataclastic bands. The evolution of fracturing in the Narni Anticline, its role in constraining thrust breakthrough trajectories and the location of extensional and strike-slip faults, and the final development of low-permeability cataclastic bands, will be relevant to studies of known oilfields in the Southern Apennines, as well as for future exploration
Particle size distributions in natural carbonate fault rocks: insights for non-self-similar cataclasis
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Earth and Planetary Science Letters
Volume 206, Issue 1-2, 30 January 2003, Pages 173-186
Particle size distributions in natural carbonate fault rocks: Insights for non-self-similar cataclasis (Article)
Storti, F. , Billi, A., Salvini, F.
Dipartimento Scienze Geol., Univ. degli Studi 'Roma Tre', Rome I-00146, Italy
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Abstract
Particle size distributions of cataclastic rocks influence the mechanical and fluid flow behaviour of fault zones. Available data from natural cataclastic rocks are still controversial and do not fully support a self-similar evolution for the cataclastic process, a concept derived from laboratory experiments and micromechanical modelling. Our analyses of particle size in carbonate fault rocks show power law distributions with fractal dimensions spanning a broad range. This confirms that the idea of a persistent fragmentation mechanism for describing the entire evolution of natural cataclastic fault cores in carbonate rocks is inadequate. Conversely, we propose that the fragmentation mechanism progressively changes with the intensity of comminution. Slip localisation within narrow shear bands is favoured when a favourable cataclastic fabric with fractal dimensions D ∼ 2.6-2.7 is achieved in the fault zone. Intense comminution in the narrow shear zones produces the preferential formation of small diameter particles resulting in particle size distributions characterised by D values approaching or exceeding 3. The non-self-similar evolution of natural cataclastic rocks has an important impact on the frictional and permeability properties of fault zones
Active-hinge-folding-related deformation and its role in hydrocarbon exploration and development-insights from HCA mdeling
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