Modeling Trench Sediment‐Controlled Flow in Subduction Channels : Implications for the Topographic Evolution of the Central Andean Fore Arc. / Cosentino, Nicolas; Morgan, Jason; Jordan, Terry.

In: Journal of Geophysical Research: Solid Earth, Vol. 123, No. 10, 10.2018, p. 9121-9135.

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Modeling Trench Sediment‐Controlled Flow in Subduction Channels : Implications for the Topographic Evolution of the Central Andean Fore Arc. / Cosentino, Nicolas; Morgan, Jason; Jordan, Terry.

In: Journal of Geophysical Research: Solid Earth, Vol. 123, No. 10, 10.2018, p. 9121-9135.

Research output: Contribution to journalArticle

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Cosentino, Nicolas ; Morgan, Jason ; Jordan, Terry. / Modeling Trench Sediment‐Controlled Flow in Subduction Channels : Implications for the Topographic Evolution of the Central Andean Fore Arc. In: Journal of Geophysical Research: Solid Earth. 2018 ; Vol. 123, No. 10. pp. 9121-9135.

BibTeX

@article{523c883e38b8446bb7db8c5fbc913e16,
title = "Modeling Trench Sediment‐Controlled Flow in Subduction Channels: Implications for the Topographic Evolution of the Central Andean Fore Arc",
abstract = "The high elevation of the onshore forearc platform in northern Chile cannot be accounted for by previously proposed tectonic mechanisms such as coastal underplating and coseismic deformation, whose topographic effects are restricted to the coastal zone. Subduction channels have been recognized both in modern and fossil non‐collisional convergent margins, yet their role on forearc surface elevation has not been sufficiently explored. Long‐term viscoelastic flow in a strengthened, finite‐thickness subduction channel promotes coupled offshore forearc subsidence and onshore forearc platform uplift. We propose that the onset of protracted hyperaridity in the coastal zone of northern Chile starved the trench of sediments, inducing a rise in shear stress at the top of the subduction channel sufficient to trigger hundreds of meters of uplift of the onshore forearc basin surface, most of which took place by the middle Miocene. This is consistent with latitudinal correlations between coastal precipitation, trench sediment thickness and onshore forearc topography along the Chilean margin, and with available paleoclimatic and paleotopographic evidence in northern Chile.",
author = "Nicolas Cosentino and Jason Morgan and Terry Jordan",
year = "2018",
month = oct,
doi = "10.1029/2018JB016109",
language = "English",
volume = "123",
pages = "9121--9135",
journal = "Journal of Geophysical Research: Solid Earth",
issn = "2169-9313",
publisher = "Wiley-Blackwell",
number = "10",

}

RIS

TY - JOUR

T1 - Modeling Trench Sediment‐Controlled Flow in Subduction Channels

T2 - Implications for the Topographic Evolution of the Central Andean Fore Arc

AU - Cosentino, Nicolas

AU - Morgan, Jason

AU - Jordan, Terry

PY - 2018/10

Y1 - 2018/10

N2 - The high elevation of the onshore forearc platform in northern Chile cannot be accounted for by previously proposed tectonic mechanisms such as coastal underplating and coseismic deformation, whose topographic effects are restricted to the coastal zone. Subduction channels have been recognized both in modern and fossil non‐collisional convergent margins, yet their role on forearc surface elevation has not been sufficiently explored. Long‐term viscoelastic flow in a strengthened, finite‐thickness subduction channel promotes coupled offshore forearc subsidence and onshore forearc platform uplift. We propose that the onset of protracted hyperaridity in the coastal zone of northern Chile starved the trench of sediments, inducing a rise in shear stress at the top of the subduction channel sufficient to trigger hundreds of meters of uplift of the onshore forearc basin surface, most of which took place by the middle Miocene. This is consistent with latitudinal correlations between coastal precipitation, trench sediment thickness and onshore forearc topography along the Chilean margin, and with available paleoclimatic and paleotopographic evidence in northern Chile.

AB - The high elevation of the onshore forearc platform in northern Chile cannot be accounted for by previously proposed tectonic mechanisms such as coastal underplating and coseismic deformation, whose topographic effects are restricted to the coastal zone. Subduction channels have been recognized both in modern and fossil non‐collisional convergent margins, yet their role on forearc surface elevation has not been sufficiently explored. Long‐term viscoelastic flow in a strengthened, finite‐thickness subduction channel promotes coupled offshore forearc subsidence and onshore forearc platform uplift. We propose that the onset of protracted hyperaridity in the coastal zone of northern Chile starved the trench of sediments, inducing a rise in shear stress at the top of the subduction channel sufficient to trigger hundreds of meters of uplift of the onshore forearc basin surface, most of which took place by the middle Miocene. This is consistent with latitudinal correlations between coastal precipitation, trench sediment thickness and onshore forearc topography along the Chilean margin, and with available paleoclimatic and paleotopographic evidence in northern Chile.

U2 - 10.1029/2018JB016109

DO - 10.1029/2018JB016109

M3 - Article

VL - 123

SP - 9121

EP - 9135

JO - Journal of Geophysical Research: Solid Earth

JF - Journal of Geophysical Research: Solid Earth

SN - 2169-9313

IS - 10

ER -