Computerized X-ray tomography analysis of sandbox models: Examples of thin-skinned thrust systems

Field: Earth and Planetary Sciences (Physical Sciences)

Research Article| November 01, 1991 Computerized X-ray tomography analysis of sandbox models: Examples of thin-skinned thrust systems Bernard Colletta; Bernard Colletta 1Institut Français du Pétrole, B.P. 311, 92506 Rueil Malmaison, France Search for other works by this author on: GSW Google Scholar Jean Letouzey; Jean Letouzey 1Institut Français du Pétrole, B.P. 311, 92506 Rueil Malmaison, France Search for other works by this author on: GSW Google Scholar Roberto Pinedo; Roberto Pinedo 1Institut Français du Pétrole, B.P. 311, 92506 Rueil Malmaison, France Search for other works by this author on: GSW Google Scholar Jean François Ballard; Jean François Ballard 2Lithologic, "Germanium," 80 avenue des Buttes de Coesmes, 35700 Rennes, France Search for other works by this author on: GSW Google Scholar Pascal Balé Pascal Balé 2Lithologic, "Germanium," 80 avenue des Buttes de Coesmes, 35700 Rennes, France Search for other works by this author on: GSW Google Scholar Author and Article Information Bernard Colletta 1Institut Français du Pétrole, B.P. 311, 92506 Rueil Malmaison, France Jean Letouzey 1Institut Français du Pétrole, B.P. 311, 92506 Rueil Malmaison, France Roberto Pinedo 1Institut Français du Pétrole, B.P. 311, 92506 Rueil Malmaison, France Jean François Ballard 2Lithologic, "Germanium," 80 avenue des Buttes de Coesmes, 35700 Rennes, France Pascal Balé 2Lithologic, "Germanium," 80 avenue des Buttes de Coesmes, 35700 Rennes, France Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1991) 19 (11): 1063–1067. https://doi.org/10.1130/0091-7613(1991)019<1063:CXRTAO>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Bernard Colletta, Jean Letouzey, Roberto Pinedo, Jean François Ballard, Pascal Balé; Computerized X-ray tomography analysis of sandbox models: Examples of thin-skinned thrust systems. Geology 1991;; 19 (11): 1063–1067. doi: https://doi.org/10.1130/0091-7613(1991)019<1063:CXRTAO>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Computerized X-ray tomography applied to analog sandbox experiments performed in a normal gravity field makes possible the analysis of the kinematic evolution, as well as the three-dimensional geometry, of models that simulate tectonic deformations. Most of the plastic or viscous analog materials generally used in a normal gravity field for such models have X-ray attenuations compatible with medical scanner images. Models using soft, cohesionless granular materials were studied. Faults in granular materials corresponding to dilatant zones with lower (by 30%-50%) X-ray attenuation are thus clearly visible in the tomography images. Kinematic analysis was done on imbricate thrust propagation. In materials with an internal friction angle of 30°, thrust propagation is controlled mainly by a triangular pop-up structure resulting from the nucleation of two conjugate thrusts at the basal decollement. The pop-up structure is created immediately in front of the previous thrust. Three-dimensional geometry analysis was tested on lateral ramps parallel to the transport direction. Lateral ramps were induced by changing the frictional boundary conditions at the bottom of the model. Though the lateral ramps strike almost parallel to the transport direction, their dip angle is comparable to the dip angle of frontal ramps. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.