Antithetic linkage between oblique Quaternary thrusts at the Andean front, Argentine Precordillera

Ahumada, Emilio A.; Costa, Carlos H.

doi:10.1016/j.jsames.2009.03.008

Cited by 24 publications

(47 citation statements)

References 18 publications

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“…While the relief on the paleo-landscape remnants is low (b1 km) and climate is arid, the region is tectonically active. Modern shortening is occurring in the adjacent Sierra de las Peñas system 15 km to the east of the study region (Ahumada and Costa, 2009;Schmidt et al, 2011aSchmidt et al, , 2011b. Erosion rates for the colluvium draped paleo-landscape remnants are near the median values reported for rock outcrops in the compilation by Portenga and Bierman (2011).…”

Section: Non-equilibrium Landscapementioning

confidence: 65%

“…There are few constraints on the onset of deformation in this region. Locally, the oldest constraint on faulting within the northern study area is 20 Ma (Reyna, 2011) with neotectonic activity occurring in the Sierra de las Peñas (Ahumada and Costa, 2009;Schmidt et al, 2011aSchmidt et al, , 2011b. The nearest age constraints are~100 km to the north and south.…”

Section: Deformation Historymentioning

confidence: 97%

“…6, N1a) contain a second large knickpoint where the river cuts through the Quaternary Sierra de las Peñas uplift east of the Precordillera (Ahumada and Costa, 2009). This Quaternary uplift invalidates the assumption that the foreland has not been altered since the Paleogene.…”

Section: Amount Of Upliftmentioning

confidence: 99%

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Surface uplift and erosion of the southernmost Argentine Precordillera

Walcek

Hoke

2012

Geomorphology

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Section: Non-equilibrium Landscapementioning

confidence: 65%

Section: Deformation Historymentioning

confidence: 97%

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Surface uplift and erosion of the southernmost Argentine Precordillera

Walcek

Hoke

2012

Geomorphology

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“…Along most of the San Juan Precordillera, the NNE-trending Andean frontal deformation zone is characterized by the interaction of these two thrust systems with opposite vergence (Ahumada & Costa 2009;Ahumada 2010). This tectonic array has been defined north of San Juan city as a thick-skinned triangle zone (Zapata & Allmendinger 1996).…”

Section: Tectonic Settingmentioning

confidence: 99%

“…1), an arid environment in combination with numerous well-incised creeks across the Las Peñas -Las Higueras range provide probably the best opportunity along the entire chain for analysing the surface geometry of the Quaternary thrust front of the Andes at outcrop scale. This morphostructure is bounded for the most part by the east-directed Las Peñas Thrust System, which has concentrated significant Quaternary shortening at these latitudes (Cortés & Costa 1996;Costa et al 2000aCosta et al , 2006aVergés et al 2007;Ahumada & Costa 2009;Schmidt et al 2011a).…”

mentioning

confidence: 99%

Quaternary shortening at the orogenic front of the Central Andes of Argentina: the Las Peñas Thrust System

Costa

Ahumada

Gardini

et al. 2014

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The NNW-trending Las Peñas Thrust System is one of the key structures along the Andean orogenic front between 32815 ′ and 32840 ′ S in the Southern Precordillera of Argentina. This east-verging structure crops out over a distance of c. 40 km and provides one of the best opportunities for a detailed field survey of Quaternary thrusting in the Andean frontal deformation zone. We present a systematic description of the geometry and geomorphic signatures of the main thrust deformation zone, which emplaces Neogene rocks over Quaternary alluvium, and usually behaves as a blind propagating thrust into the youngest (Late Pleistocene-Holocene) alluvial deposits. The Las Peñas Thrust System is understood to represent the latest stage of the eastward migration of an imbricated fan structure, which has driven the neotectonic uplift of the Las Peñas-Las Higueras range. Excellent outcrops provided by well-incised creek outlets reveal that the thrust system is made up either by a single fault surface or by two or more frontal splays. Several sections along its length can be differentiated on the basis of thrust geometries and/or morphotectonic features. The northern sections are characterized by isolated outcrops of Neogene rocks in the hanging wall, surrounded by alluvial bajadas. Remnants of fold limbs scarps depict the geomorphic signature of the thrust propagation into the Quaternary layers, although the preserved topographic relief always underestimates the cumulated thrust slip during the Quaternary. The southern part of this thrust system is defined by a frontal range, cored by a transposed south-plunging anticline in bedrock. Our observations suggest a dynamic and unsteady interaction between thrust propagation and sedimentation/erosion processes along the thrust trace during deposition of the Quaternary alluvial layers.

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