INVESTIGADORES
CRISTALLINI ernesto Osvaldo
artículos
Título:
Backlimb trishear: a kinematic model for curved folds developed over angular fault bends.
Autor/es:
CRISTALLINI, E.O.; ALLMENDINGER, R.
Revista:
JOURNAL OF STRUCTURAL GEOLOGY
Editorial:
Elsevier Ltd.
Referencias:
Año: 2002 vol. 24 p. 289 - 295
ISSN:
0191-8141
Resumen:
Numerous analog models and some natural examples display smoothly
curving backlimb fold hinges over sharp, angular bends in the underlying thrust
surface. We present a new kinematic model that can reproduce this geometry by
defining a triangular zone focused on the fault bend. The model presupposes
incompressible flow in the triangular zone and makes common assumptions
about velocities on either side of the fault bend. Either symmetric or asymmetric
triangular zones can be defined, with parallel kink folding and similar folding
being special cases of the two, respectively, where the apical angle of the
triangular zone is zero. The results of the numerical model compare well to
analog experiments. The model is conceptually analogous to forelimb trishear at
the tip of a propagating fault and hence we refer to it as backlimb trishear