Growth and erosion of fold-and-thrust belts with an application to the Aconcagua fold-and-thrust belt, Argentina

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 fluvia...

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Autores principales: Hilley, G.E., Strecker, M.R., Ramos, V.A.
Formato: JOUR
Materias:
Argentina
Critical Coulomb wedge
Fluvial bedrock incision
Sierra Aconcagua
crustal evolution
erosion
fluvial process
orogenic belt
structural control
South America
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_21699313_v109_n1_pB014101_Hilley
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_21699313_v109_n1_pB014101_Hilley
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spelling todo:paper_21699313_v109_n1_pB014101_Hilley2023-10-03T16:39:55Z Growth and erosion of fold-and-thrust belts with an application to the Aconcagua fold-and-thrust belt, Argentina Hilley, G.E. Strecker, M.R. Ramos, V.A. Argentina Critical Coulomb wedge Fluvial bedrock incision Sierra Aconcagua crustal evolution erosion fluvial process orogenic belt structural control Argentina South America 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_21699313_v109_n1_pB014101_Hilley
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Critical Coulomb wedge
Fluvial bedrock incision
Sierra Aconcagua
crustal evolution
erosion
fluvial process
orogenic belt
structural control
Argentina
South America
spellingShingle Argentina
Critical Coulomb wedge
Fluvial bedrock incision
Sierra Aconcagua
crustal evolution
erosion
fluvial process
orogenic belt
structural control
Argentina
South America
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
topic_facet Argentina
Critical Coulomb wedge
Fluvial bedrock incision
Sierra Aconcagua
crustal evolution
erosion
fluvial process
orogenic belt
structural control
Argentina
South America
description 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.
format JOUR
author Hilley, G.E.
Strecker, M.R.
Ramos, V.A.
author_facet Hilley, G.E.
Strecker, M.R.
Ramos, V.A.
author_sort Hilley, G.E.
title Growth and erosion of fold-and-thrust belts with an application to the Aconcagua fold-and-thrust belt, Argentina
title_short Growth and erosion of fold-and-thrust belts with an application to the Aconcagua fold-and-thrust belt, Argentina
title_full Growth and erosion of fold-and-thrust belts with an application to the Aconcagua fold-and-thrust belt, Argentina
title_fullStr Growth and erosion of fold-and-thrust belts with an application to the Aconcagua fold-and-thrust belt, Argentina
title_full_unstemmed Growth and erosion of fold-and-thrust belts with an application to the Aconcagua fold-and-thrust belt, Argentina
title_sort growth and erosion of fold-and-thrust belts with an application to the aconcagua fold-and-thrust belt, argentina
url http://hdl.handle.net/20.500.12110/paper_21699313_v109_n1_pB014101_Hilley
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AT streckermr growthanderosionoffoldandthrustbeltswithanapplicationtotheaconcaguafoldandthrustbeltargentina
AT ramosva growthanderosionoffoldandthrustbeltswithanapplicationtotheaconcaguafoldandthrustbeltargentina
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