Structural evolution and imaging of fold-thrust structures in analog models deformed in a large geotechnical centrifuge | Posted on:2005-01-31 | Degree:M.Sc | Type:Thesis | University:Queen's University at Kingston (Canada) | Candidate:Noble, Todd | Full Text:PDF | GTID:2450390011950888 | Subject:Geology | Abstract/Summary: | | This thesis investigates the structural evolution of fold-thrust systems by scaled physical analog modelling carried out in a large geotechnical centrifuge at C-CORE, St. Johns, NL. Multilayer models are constructed of plasticine and silicone putty to simulate foreland stratigraphic sequences and are shortened horizontally to simulate the nucleation and temporal development of individual fold-thrust structures and fold-thrust systems as a whole. The models accurately reconstruct the structural evolution and geometrical development of critically tapered wedges, duplex structures and individual fold-thrust structures.; Plane-layered models composed of five internally laminated stratigraphic units of alternating bulk competency develop geologically realistic duplex structures. An evolutionary relationship between folding and faulting exists; the low-amplitude buckling instability of the competent unit localizes and controls the spacing of thrust ramps in duplex structures. (Abstract shortened by UMI.)... | Keywords/Search Tags: | Structural evolution, Structures, Fold-thrust, Models | | Related items |
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