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Abstract:

The development of topography within and erosional removal of material from an orogen exerts a primary control on its structure. We develop a model that describes the temporal development of a frontally accreting, critically growing Coulomb wedge whose topography is largely limited by bedrock fluvial incision. We present general results for arbitrary initial critical wedge geometries and investigate the temporal development of a critical wedge with no initial topography. Increasing rock erodibility and/or precipitation, decreasing mass flux accreting to the wedge front, increasing wedge sole-out depth, decreasing wedge and basal decollement overpressure, and increasing basal decollement friction lead to narrow wedges. Large power law exponent values cause the wedge geometry to quickly reach a condition in which all material accreted to the front of the wedge is removed by erosion. We apply our model to the Aconcagua fold-and-thrust belt in the central Andes of Argentina where wedge development over time is well constrained. We solve for the erosional coefficient K that is required to recreate the field-constrained wedge growth history, and these values are within the range of independently determined values in analogous rock types. Using qualitative observations of rock erodibilities within the wedge, we speculate that power law exponents of 1/3 ≤ m ≤ 0.4 and 2/3 ≤ n ≤ 1 characterize the erosional growth of the Aconcagua fold-and-thrust belt. This general model may be used to understand the development of mountain belts where orogenic wedges grow as they deform at their Coulomb failure limit. Copyright 2004 by the American Geophysical Union.

Registro:

Documento: Artículo
Título:Growth and erosion of fold-and-thrust belts with an application to the Aconcagua fold-and-thrust belt, Argentina
Autor:Hilley, G.E.; Strecker, M.R.; Ramos, V.A.
Filiación:Institut für Geowissenschaften, Universität Potsdam, Postfach 601533, Potsdam D-14415, Germany
Departmento de Geología, Lab. de Tectónica Andina, Universidad de Buenos Aires, Pabellon II, Buenos Aires 1428, Argentina
Palabras clave:Argentina; Critical Coulomb wedge; Fluvial bedrock incision; Sierra Aconcagua; crustal evolution; erosion; fluvial process; orogenic belt; structural control; Argentina; South America
Año:2004
Volumen:109
Número:1
Página de inicio:B01410 1
Página de fin:19
Título revista:Journal of Geophysical Research: Solid Earth
Título revista abreviado:J. Geophys. Res. B Solid Earth
ISSN:21699313
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699313_v109_n1_pB014101_Hilley

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Citas:

---------- APA ----------
Hilley, G.E., Strecker, M.R. & Ramos, V.A. (2004) . Growth and erosion of fold-and-thrust belts with an application to the Aconcagua fold-and-thrust belt, Argentina. Journal of Geophysical Research: Solid Earth, 109(1), B01410 1-19.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699313_v109_n1_pB014101_Hilley [ ]
---------- CHICAGO ----------
Hilley, G.E., Strecker, M.R., Ramos, V.A. "Growth and erosion of fold-and-thrust belts with an application to the Aconcagua fold-and-thrust belt, Argentina" . Journal of Geophysical Research: Solid Earth 109, no. 1 (2004) : B01410 1-19.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699313_v109_n1_pB014101_Hilley [ ]
---------- MLA ----------
Hilley, G.E., Strecker, M.R., Ramos, V.A. "Growth and erosion of fold-and-thrust belts with an application to the Aconcagua fold-and-thrust belt, Argentina" . Journal of Geophysical Research: Solid Earth, vol. 109, no. 1, 2004, pp. B01410 1-19.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699313_v109_n1_pB014101_Hilley [ ]
---------- VANCOUVER ----------
Hilley, G.E., Strecker, M.R., Ramos, V.A. Growth and erosion of fold-and-thrust belts with an application to the Aconcagua fold-and-thrust belt, Argentina. J. Geophys. Res. B Solid Earth. 2004;109(1):B01410 1-19.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699313_v109_n1_pB014101_Hilley [ ]