info:eu-repo/semantics/article
Pseudo 3-D modeling of trishear fault-propagation folding
Fecha
2001-12Registro en:
Cristallini, Ernesto Osvaldo; Allmendinger, Richard W.; Pseudo 3-D modeling of trishear fault-propagation folding; Pergamon-Elsevier Science Ltd; Journal Of Structural Geology; 23; 12; 12-2001; 1883-1899
0191-8141
CONICET Digital
CONICET
Autor
Cristallini, Ernesto Osvaldo
Allmendinger, Richard W.
Resumen
Basement structures, to which trichear fault-propagation models have most successfully been applied, are commonly three-dimensional folds formed at the tip-line of a fault. We present here a 'pseudo-3D' trishear model in which various parameters are permitted to vary along strike and oblique-slip can be modeled. These variations may be combined in an infinite number of ways, facilitating the simulation of many real structures. A thrust changing from blind to emergent can be produced by a change in the slip or propagation-to-slip (P/S) along strike. Folds with forelimbs changing from overturned to upright along strike can be modeled either by changing the slip, P/S or trishear angle. Also some minor folds perpendicular or oblique to the main structure can result from changes in the trishear angle or fault angle along the strike. Models including growth strata show that it is practically impossible to distinguish between growth and pre-growth strata using the map patterns. As a field test, we have modeled the oblique slip East Kaibab monocline, demonstrating a good fit between the field observations and model predictions.