Andean Growth and the Deceleration of South American Subduction: Time Evolution of a Coupled Orogen-subduction System

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Andean Growth and the Deceleration of South American Subduction: Time Evolution of a Coupled Orogen-subduction System

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dc.contributor.author Meade, Brendan J.
dc.contributor.author Conrad, Clinton P.
dc.date.accessioned 2009-10-22T19:02:17Z
dc.date.issued 2008
dc.identifier.citation Meade, Brendan J., and Clinton P. Conrad. 2008. Andean growth and the deceleration of South American subduction: Time evolution of a coupled orogen-subduction system. Earth and Planetary Science Letters 275(1-2): 93-101. en_US
dc.identifier.issn 0012-821X en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:3354167
dc.description.abstract Present-day orography at the Andean margin is a result of isostasy, tectonic accretion, and erosional processes. The resulting excess mass of the Andes gives rise to frictional stresses on the seismogenic plate interface that resist the sinking of the subducting slab into the upper mantle. Thus, subduction rates should be sensitive to the time-dependent dynamics of a back-arc orogen, as well as erosional or accretional processes that affect orogen growth. Here we develop a two-dimensional coupled orogen–slab model that allows for the prediction of orogen size and plate motion in response to both tectonic and erosional forcing. We find that the frictional force exerted by the orogen on the subducting slab grows quadratically with orogen width and that the frictional resistance typically balances 10–50% of the slab pull force. The time evolution of the coupled orogen-subduction zone system is largely controlled by the rate of orogen growth, which is controlled by the rate of convergence and the erosivity of the climate state. In the case of the Andean margin, our models show that Miocene aridification leads to reduced erosion, increased orogen growth, greater frictional resistance to subduction, and, ultimately, to a ~50% reduction in the convergence rate between the Nazca and South American plates. en_US
dc.description.sponsorship Earth and Planetary Sciences en_US
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.relation.isversionof http://dx.doi.org/10.1016/j.epsl.2008.08.007 en_US
dash.license META_ONLY
dc.subject tectonic plate motions en_US
dc.subject subduction en_US
dc.subject orogen development en_US
dc.subject plate boundary zones en_US
dc.subject Nazca plate en_US
dc.subject Andes en_US
dc.subject erosion en_US
dc.subject climate en_US
dc.title Andean Growth and the Deceleration of South American Subduction: Time Evolution of a Coupled Orogen-subduction System en_US
dc.type Journal Article en_US
dc.description.version Version of Record en_US
dc.relation.journal Earth and Planetary Science Letters en_US
dash.depositing.author Meade, Brendan J.
dash.embargo.until 10000-01-01

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  • FAS Scholarly Articles [6463]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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