INVESTIGADORES
CRISTALLINI ernesto Osvaldo
artículos
Título:
Pseudo 3-D modeling of trishear fault-propagation folding.
Autor/es:
CRISTALLINI, E.O.; ALLMENDINGER, R.
Revista:
JOURNAL OF STRUCTURAL GEOLOGY
Editorial:
Elsevier Ltd.
Referencias:
Año: 2001 vol. 23 p. 1883 - 1899
ISSN:
0191-8141
Resumen:
Basement structures, to which trishear fault-propagation models have most
successfully been applied, are commonly three-dimensional folds formed at the tipline
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.