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Abstract:

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 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 at the tip of a propagating fault and hence we refer to it as 'backlimb trishear'. © 2001 Published by Elsevier Science Ltd.

Registro:

Documento: Artículo
Título:Backlimb trishear: A kinematic model for curved folds developed over angular fault bends
Autor:Cristallini, E.O.; Allmendinger, R.W.
Filiación:Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY 14853, United States
CONICET - Departamento De Ciencias Geológicas, Universidad De Buenos Aires, Argentina
Departamento De Ciencias Geológicas Ciudad Universitaria, Pabellon II, (C1428EHA), Ciudad de Buenos Aires, Argentina
Palabras clave:Angular fault bends; Backlimb trishear; Growth strata; Kinematic model; Triangular zones; Geometry; Incompressible flow; Numerical methods; Velocity; Kinematics; deformation; faulting; folding; kinematics; modeling; shear
Año:2002
Volumen:24
Número:2
Página de inicio:289
Página de fin:295
DOI: http://dx.doi.org/10.1016/S0191-8141(01)00063-3
Título revista:Journal of Structural Geology
Título revista abreviado:J. Struct. Geol.
ISSN:01918141
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01918141_v24_n2_p289_Cristallini

Referencias:

  • Berger, P., Johnson, A.M., First-order analysis of deformation of a thrust sheet moving over a ramp (1983) Tectonophysics, 70, pp. T9-T24
  • Chester, J.S., Logan, J.M., Spang, J.H., Influence of layering and boundary conditions on fault-bend and fault-propagation folding (1991) Geological Society of America Bulletin, 103, pp. 1059-1072
  • Erslev, E.A., Trishear fault-propagation folding (1991) Geology, 19, pp. 617-620
  • Hardy, S., A method for quantifying the kinematics of fault-bend folding (1995) Journal of Structural Geology, 17, pp. 1785-1788
  • Johnson, A.M., Berger, P., Kinematics of fault-bend folding (1989) Engineering Geology, 27, pp. 181-200
  • Mase, G.E., Mase, G.T., (1992) Continuum Mechanics for Engineers, , CRC Press, Boca Raton
  • Morse, J., Deformation in ramp regions of overthrust faults: Experiments with small-scale rock model (1977) Joint Wyoming-Montana-Utah Geological Association Guidebook, pp. 457-470. , Rocky Mountain Thrust Belt Geology and Resources, 29th Annual Field Conference, Wyoming Geological Association
  • Ormand, C.J., Hudleston, P.J., Analog models of fault-bend folding: The effects of oblique ramping and tear faulting on hanging wall strcutures (1999) Geological Society of America, , Annual Meeting, 1999. Abstract 51868
  • Serra, S., Styles of deformation in the ramp region of overthrust faults (1977) Joint Wyoming-Montana-Utah Geological Associations Guidebook, pp. 487-498. , Rocky Mountain Thrust Belt Geology and Resources. 29th Annual Field Conference, Wyoming Geological Asociation
  • Suppe, J., Geometry and Kinematics of fault-bend folding (1983) American Journal of Science, 283, pp. 684-721
  • Suppe, J., Mendwedeff, D., Geometry and kinematics of fault-propagation folding (1990) Eclogae Geol. Helv, 83, pp. 409-454
  • White, N.J., Jackson, J.A., McLemzoe, D.P., The relationship between the geometry of normal faults and that of the sedimentary layers in their hanging walls (1986) Journal of Structural Geology, 8, pp. 897-909
  • Zehnder, A.T., Allmendinger, R.W., Velocity field for the trishear model (2000) Journal of Structural Geology, 22, pp. 1009-1014

Citas:

---------- APA ----------
Cristallini, E.O. & Allmendinger, R.W. (2002) . Backlimb trishear: A kinematic model for curved folds developed over angular fault bends. Journal of Structural Geology, 24(2), 289-295.
http://dx.doi.org/10.1016/S0191-8141(01)00063-3
---------- CHICAGO ----------
Cristallini, E.O., Allmendinger, R.W. "Backlimb trishear: A kinematic model for curved folds developed over angular fault bends" . Journal of Structural Geology 24, no. 2 (2002) : 289-295.
http://dx.doi.org/10.1016/S0191-8141(01)00063-3
---------- MLA ----------
Cristallini, E.O., Allmendinger, R.W. "Backlimb trishear: A kinematic model for curved folds developed over angular fault bends" . Journal of Structural Geology, vol. 24, no. 2, 2002, pp. 289-295.
http://dx.doi.org/10.1016/S0191-8141(01)00063-3
---------- VANCOUVER ----------
Cristallini, E.O., Allmendinger, R.W. Backlimb trishear: A kinematic model for curved folds developed over angular fault bends. J. Struct. Geol. 2002;24(2):289-295.
http://dx.doi.org/10.1016/S0191-8141(01)00063-3