Deformation of the Central Andean Upper Plate System — Facts, Fiction, and Constraints for Plateau Models

Oncken, Onno; Hindle, David; Kley, Jonas; Elger, Kirsten; Victor, Pia; Schemmann, Kerstin

doi:10.1007/978-3-540-48684-8_1

Cited by 275 publications

(444 citation statements)

References 110 publications

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“…This is in agreement with the dominant vergence of Andean structures and the well-established eastward propagation of deformation [James, 1971;Allmendinger et al, 1983Allmendinger et al, , 1990Jordan et al, 1983Jordan et al, , 1993Ramos 1988Ramos , 2009Mpodozis and Ramos, 1989;Kley et al, 1999;Cristallini and Ramos, 2000;Giambiagi et al, 2001Giambiagi et al, , 2003Coutand et al, 2001;ANCORP Working Group, 2003;Ramos et al, 2004;Kay et al, 2005;Oncken et al, 2006].…”

Section: Chilean Central Depression: a Foreland Basin?supporting

confidence: 84%

Comment on “The West Andean Thrust, the San Ramón Fault, and the seismic hazard for Santiago, Chile” by Rolando Armijo et al.

Astini

Dávila

2010

Tectonics

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Section: Chilean Central Depression: a Foreland Basin?supporting

confidence: 84%

Comment on “The West Andean Thrust, the San Ramón Fault, and the seismic hazard for Santiago, Chile” by Rolando Armijo et al.

Astini

Dávila

2010

Tectonics

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“…2c ). In the knickzone, stream profi les steepen and become more concave to adjust to the lowered ( a ) Colour fi gure illustrating the tectono-geomorphic domains 3 , the depth of the subducting Nasca plate (dotted lines), the left-lateral faults (dashed lines) dissecting the mountain belt and annual rainfall rates. The inset map shows the streams that were analyzed for this study.…”

Section: Resultsmentioning

confidence: 99%

“…Th e chronology of tectonic deformation along this transect has been restored based on tectonic and stratigraphic investigations, and low-temperature thermochronometres 3,[7][8][9][10][11]26,32,33 . Although the rate of cumulative shortening across the entire Central Andes has been constant between the Oligocene and the present ( Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Low-temperature thermo-chronometry 43 combined with sequential restorations of stream profi le geometries 45 suggest that this uplift was accomplished by thrusting along steeply dipping reverse faults 33 ( Fig. 1c ), with internal deformation terminating ca 7 Ma ago 3 . Subsequent warping additionally steepened the streams 34,46 , but this mechanism cannot explain the formation of the knickzones as they initiated before 7 Ma 43,45 .…”

Section: Discussionmentioning

confidence: 99%

“…Th e eastern side receives annual rainfall amounts of > 3500 mm 2 and experiences active shortening and thrusting 3 , whereas the western side is one of the driest places on Earth and is deformed by longwavelength warping 2 -4 . Th e mechanisms, which acted to create this structure are, however, contested 5,6 .…”

mentioning

confidence: 99%

See 2 more Smart Citations

Migrating deformation in the Central Andes from enhanced orographic rainfall

Norton

Schlunegger

2011

Nat Commun

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Delamination of southern Puna lithosphere revealed by body wave attenuation tomography

et al. 2014

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The southern Puna Plateau has been proposed to result from a major Pliocene delamination event that has previously been inferred from geochemical, geological, and some preliminary geophysical data. Seventy-five seismic stations were deployed across the southern Puna Plateau in 2007-2009 by scientists from the U.S., Germany, Chile, and Argentina to test the delamination model for the region. The Puna passive seismic stations were located between 25 and 28°S. Using the seismic waveform data collected from the PUNA experiment, we employ attenuation tomography methods to resolve both compressional and shear quality factors (Qp and Qs, respectively) in the crust and uppermost mantle. The images clearly show a high-Q Nazca slab subducting eastward beneath the Puna plateau and another high-Q block with a westward dip beneath the Eastern Cordillera. We suggest that the latter is a piece of delaminated South American lithosphere. A significant low-Q zone lies between the Nazca slab and the South American lithosphere and extends southward from the northern margin of the seismic array at 25°S before vanishing around 27.5°S. This low-Q zone extends farther west in the crust and uppermost mantle at the southern end of the seismic array. The low-Q zone reaches~100 km depth beneath the northern part of the array but only~50 km depth in the south. Lateral variations of the low-Q zone reflect the possible mechanism conversion between mantle upwelling related to delamination and dehydration. The depth of the Nazca slab as defined by Q images decreases from north to south beneath the plateau, which is consistent with the steep-flat transition of the angle of the subducting slab as defined by previous earthquake studies.

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Deformation of the Central Andean Upper Plate System — Facts, Fiction, and Constraints for Plateau Models

Cited by 275 publications

References 110 publications

Comment on “The West Andean Thrust, the San Ramón Fault, and the seismic hazard for Santiago, Chile” by Rolando Armijo et al.

Comment on “The West Andean Thrust, the San Ramón Fault, and the seismic hazard for Santiago, Chile” by Rolando Armijo et al.

Migrating deformation in the Central Andes from enhanced orographic rainfall

Delamination of southern Puna lithosphere revealed by body wave attenuation tomography

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