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Abstract:

Numerical 2-D models based on the principle of minimum work were used to examine the space-time distribution of active faulting during the evolution of orogenic wedges. A series of models focused on thin-skinned thrusting illustrates the effects of arid conditions (no erosion), unsteady state conditions (accretionary influx greater than erosional efflux) and steady state conditions (accretionary influx balances erosional efflux), on the distribution of fault activity. For arid settings, a general forward accretion sequence prevails, although a significant amount of internal deformation is registered: the resulting fault pattern is a rather uniform spread along the profile. Under fixed erosional efficiency settings, the frontal advance of the wedge-front is inhibited, reaching a steady state after a given forward propagation. Then, the applied shortening is consumed by surface ruptures over a narrow frontal zone. Under a temporal increase in erosional efficiency (i.e., transient non-steady state mass balance conditions), a narrowing of the synthetic wedge results; a rather diffuse fault activity distribution is observed during the deformation front retreat. Once steady balanced conditions are reached, a single long-lived deformation front prevails.Fault activity distribution produced during the deformation front retreat of the latter scenario, compares well with the structural evolution and hinterlandward deformation migration identified in southern Bolivian Subandes (SSA) from late Miocene to present. This analogy supports the notion that the SSA is not in steady state, but is rather responding to an erosional efficiency increase since late Miocene.The results shed light on the impact of different mass balance conditions on the vastly different kinematics found in mountain ranges, suggesting that those affected by growing erosion under a transient unbalanced mass flux condition tend to distribute deformation along both frontal and internal faults, while others under balanced conditions would display focused deformation on a limited number of steady structures. © 2014 Elsevier Ltd.

Registro:

Documento: Artículo
Título:Distribution of active faulting along orogenic wedges: Minimum-work models and natural analogue
Autor:Yagupsky, D.L.; Brooks, B.A.; Whipple, K.X.; Duncan, C.C.; Bevis, M.
Filiación:Laboratorio de Modelado Geológico, Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), Departamento de Ciencias Geológicas, FCEN, Universidad de Buenos Aires, BsAs C1428EGA, Argentina
School of Ocean and Earth Science and Technology, University of Hawaii, 1680 East-West Rd., Honolulu, HI 96822, United States
Schoolof Earth and Space Exploration, Arizona State University, Tempe, AZ, United States
Department of Geosciences, University of Massachusetts, Amherst, MA 01002, United States
Geodetic Science, Ohio State University, Columbus, OH, United States
Earthquake Science Center, US Geological Survey, 345 Middlefield Rd., Menlo Park, CA 94025, United States
Palabras clave:Bolivian subandes; Erosion; Minimum work; Orogenic wedge; Thrust activity; Deformation; Efficiency; Electric fault currents; Faulting; Activity distribution; Bolivian subandes; Mass balance conditions; Minimum work; Orogenic wedge; Space time distribution; Steady-state condition; Unsteady state conditions; Erosion; accretionary prism; active fault; deformation; erosion; numerical model; orogeny; thin skinned tectonics; thrust; two-dimensional modeling; Bolivia
Año:2014
Volumen:66
Página de inicio:237
Página de fin:247
DOI: http://dx.doi.org/10.1016/j.jsg.2014.05.025
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_v66_n_p237_Yagupsky

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Citas:

---------- APA ----------
Yagupsky, D.L., Brooks, B.A., Whipple, K.X., Duncan, C.C. & Bevis, M. (2014) . Distribution of active faulting along orogenic wedges: Minimum-work models and natural analogue. Journal of Structural Geology, 66, 237-247.
http://dx.doi.org/10.1016/j.jsg.2014.05.025
---------- CHICAGO ----------
Yagupsky, D.L., Brooks, B.A., Whipple, K.X., Duncan, C.C., Bevis, M. "Distribution of active faulting along orogenic wedges: Minimum-work models and natural analogue" . Journal of Structural Geology 66 (2014) : 237-247.
http://dx.doi.org/10.1016/j.jsg.2014.05.025
---------- MLA ----------
Yagupsky, D.L., Brooks, B.A., Whipple, K.X., Duncan, C.C., Bevis, M. "Distribution of active faulting along orogenic wedges: Minimum-work models and natural analogue" . Journal of Structural Geology, vol. 66, 2014, pp. 237-247.
http://dx.doi.org/10.1016/j.jsg.2014.05.025
---------- VANCOUVER ----------
Yagupsky, D.L., Brooks, B.A., Whipple, K.X., Duncan, C.C., Bevis, M. Distribution of active faulting along orogenic wedges: Minimum-work models and natural analogue. J. Struct. Geol. 2014;66:237-247.
http://dx.doi.org/10.1016/j.jsg.2014.05.025