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Analog Models of Flanking Structures and a Natural Example in the Quadrilátero Ferrífero, Minas Gerais Anais da ABC (AABC)
GOMES,CAROLINE J.S.; RODRIGUES,BRAULIO A.; ENDO,ISSAMU.
ABSTRACT The aim of this study is to present analog models of flanking structures and to analyze the Fábrica Nova synform, Quadrilátero Ferrífero, Minas Gerais, from a geometric point of view. We set up seven models using a linear viscous silicone and produced flanking structures with a shear velocity of 2 cm h-1. At different initial orientations with respect to the shear zone boundary, a rigid cross-cutting element with lubricated boundaries was deformed via sinistral bulk flow at a shear strain of γ = 1.28. The most interesting features of our experiments are the geometries of the different marker lines, which are heterogeneous and resulted from thickening and thinning of the silicone at the cross-cutting element terminations. To compare our analog...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Physical modelling; Flanking folds; Silicone; Fábrica Nova synform.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401431
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Glass Microbeads in Analog Models of Thrust Wedges Anais da ABC (AABC)
D'ANGELO,TAYNARA; GOMES,CAROLINE J.S..
ABSTRACT Glass microbeads are frequently used in analog physical modeling to simulate weak detachment zones but have been neglected in models of thrust wedges. Microbeads differ from quartz sand in grain shape and in low angle of internal friction. In this study, we compared the structural characteristics of microbeads and sand wedges. To obtain a better picture of their mechanical behavior, we determined the physical and frictional properties of microbeads using polarizing and scanning electron microscopy and ring-shear tests, respectively. We built shortening experiments with different basal frictions and measured the thickness, slope and length of the wedges and also the fault spacings. All the microbeads experiments revealed wedge geometries that were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Compressional deformation models; Sand; Microbeads; Physical and frictional characterizations..
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100073
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Testing the influence of a sand mica mixture on basin fill in extension and inversion experiments Anais da ABC (AABC)
GOMES,CAROLINE J.S.; D'ANGELO,TAYNARA; ALMEIDA,GISELA M.S..
We compare the deformation patterns produced by sand and a sand mica mixture (14:1 ratio of sand to mica by weight) while simulating basin fill in extension and inversion models to analyze the potential of the sand mica mixture for applications that require a strong elasto-frictional plastic analogue material in physical models. Sand and the sand mica mixture have nearly equal angles of internal friction, but the sand mica mixture deforms at a significantly lower level of peak shear stress. In extension, the sand mica mixture basin fill experiments show fewer normal faults. During inversion, the most striking difference between the sand and the sand mica mixture basin fill experiments is related to the internal deformation in fault-propagation folds, which...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Analogue modeling; Sand mica mixture; Tectonic inversion; Basal friction; Fault-propagation folds.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100051
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