Cenozoic tectonostratigraphic evolution and architecture of the Central Andes in northern Chile based on the Aquine region, Western Cordillera (19°-19º30’ S).

Herrera, Sebastian Sanchez; Pinto, Luisa; Deckart, Katja; Cortés, Javier; Valenzuela, Javier Ignacio

doi:10.5027/andgeov44n2-a01

Cited by 11 publications

(12 citation statements)

References 46 publications

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“…3 and 4) (Blanco and Tomlinson, 2013). Previous works have associated these folds with west-verging blind thrusts (Amilibia and Skarmeta, 2003;Armijo et al, 2015), while others consider that they resulted from reactivated normal faults (Charrier et al, 2007;Fuentes et al, 2016;Herrera et al, 2017).…”

Section: Structural Settingmentioning

confidence: 99%

“…This surface commonly prevents the observation of structural and stratigraphic relations in the region. However, the regional structure of the study area can be divided into two tectonic domains that form part of a large N-S-oriented contractional system (Muñoz and Sepúlveda, 1992;Muñoz and Charrier, 1996;Farías et al, 2005;Charrier et al 2013;Herrera et al, 2017) (Fig. 2).…”

Section: Structural Settingmentioning

confidence: 99%

“…In addition, other large west-and east-verging reverse faults that extend from the Longacho Hill to the south of the Guatacondo Creek have been interpreted based on previous analysis of seismic and field data (Victor et al, 2004;Nester, 2008;Jordan et al, 2010;Nester and Jordan, 2012;Labbé et al, 2015). Many of these were interpreted as inverted faults (Charrier et al, 2013;Fuentes et al, 2016;Fuentes et al, 2017;Herrera et al, 2017), because these bound the lateral continuity of the Mesozoic deposits related to the synrift infill of the Tarapacá Basin (Gallardo, 2015;Fuentes et al, 2016;Fuentes et al, 2017). In map view, all these structures (reverse and inverted faults) can be seen affecting the Oligocene and Neogene volcanic and sedimentary deposits, and also the oldest Mesozoic deposits (Fig.…”

Section: Structural Settingmentioning

confidence: 99%

“…1 and 2) in northern Chile is one of the main basins that resulted from this Mesozoic extensional tectonic regime, which can be extended south toward the Copiapó region in Chile (27°S) and north toward southern Peru (Vicente, 2006). Its structural and stratigraphic relations have been mostly interpreted from field data in some sectors of the Domeyko Cordillera (Muñoz and Charrier, 1996;Ardill et al, 1998;Farías et al, 2005;Amilibia et al, 2008;Herrera et al, 2017), and also from seismic profiles of the Pampa del Tamarugal (Victor et al, 2004;Nester, 2008;Jordan et al, 2010;Nester and Jordan, 2012;Labbé et al, 2015) and the Salar de Atacama Basin (Pananont et al, 2004;Arriagada et al, 2006;Jordan et al, 2007, and others). Based on these studies, different structural styles have been recognized to affect both the infill and the basement of this basin.…”

Section: Introductionmentioning

confidence: 99%

“…Based on these studies, different structural styles have been recognized to affect both the infill and the basement of this basin. They are frequently related to thickskinned thrust systems, strike-slip faults, and/or normal faulting (Mortimer, 1973;Flint et al, 1993;Muñoz and Charrier, 1996;Victor et al, 2004;Farías et al, 2005;Herrera et al, 2017). Despite these attempts, other regions of this basin are still unexplored.…”

Section: Introductionmentioning

confidence: 99%

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Tectonic architecture of the Tarapacá Basin in the northern Central Andes: New constraints from field and 2D seismic data

et al. 2018

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The Tarapacá Basin is one of the larger basins created on the western margin of South America during the Mesozoic times. Regional studies focused their attention on understanding its Cenozoic surface structures, traditionally interpreted as a west-verging thrust and fold belt. However, its internal and deep architecture and the influence of previously developed Mesozoic extensional structures on its current structure have not been analyzed in detail. We used new field data and 2D seismic data to determine the tectonic architecture of the Tarapacá Basin. We have paid special attention to defining both the deep and superficial structures to understand its tectonic evolution. The seismic data reveal the existence of a series of half-graben structures along which Mesozoic synrift stratigraphic sequences accumulated. We also show that Upper Cretaceous and Cenozoic synorogenic sequences mainly accumulated over contractional folds (anticlines and synclines). The structure is characterized by a thickskinned structural style dominated by structures inverted during the oblique reactivation of ancient Mesozoic normal faults and also by newly formed reverse faults in the form of shortcut and bypass faults. The presence of Upper Cretaceous to Tertiary synorogenic sequences over the contractional structures, separated by angular unconformities, allowed us to show that the basin inversion and its subsequent deformation occurred at least since the Late Cretaceous until Recent times. These results aid in understanding the role of extensional structures in the evolution of orogenic belts and can be compared with similar structures around the world.

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Section: Structural Settingmentioning

confidence: 99%

Section: Structural Settingmentioning

confidence: 99%

Section: Structural Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tectonic architecture of the Tarapacá Basin in the northern Central Andes: New constraints from field and 2D seismic data

et al. 2018

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The relationships between tectonics, climate and exhumation in the Central Andes (18–36°S): Evidence from low-temperature thermochronology

Stalder

Herman

Fellin

et al. 2020

Earth-Science Reviews

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The Central Andes between 18°S and 36°S latitude strike north-south for 2000 km along the Chilean subduction margin, cross several climate zones from hyperarid to humid and exhibit mean elevations in excess of 4000 m.a.s.l. Here, we investigate the relationships between tectonics, climate and exhumation by inverting low-temperature thermochronological data compiled from the literature (824 ages from 549 samples) and new data (238 ages from 146 samples) to quantify the exhumation rate history of the Central Andes since 80 Ma. Our inferred exhumation rates west of the drainage divide and between 18 and 32°S did not exceed 0.25 km/Ma. Such low exhumation rates are consistent with low shortening rates and arid conditions in this region. Local pulses of exhumation occurred only during the Eocene as 2 response to active deformation and during the Miocene, probably as response to uplift of the western Andean slope. East of the drainage divide between 18 and 28°S, the observed exhumation pattern reflects the onset and eastward propagation of deformation. Here, exhumation occurred locally since the middle-to-late Eocene in the Eastern Cordillera and the Altiplano-Puna and subsequently affected larger parts of these regions and the northwestern Sierra Pampeanas during the Oligocene. In the early Miocene (~20 Ma), the Interandean zone started exhuming and at 12-10 Ma exhumation propagated into the Subandean zone. Enhanced shortening rates and intensified precipitation along the eastern deformation front associated with the onset of the South American Monsoon led to increased exhumation rates in the eastern Interandean and the Subandean zones in the Plio-Pleistocene (0.6 km/Ma). Higher Pleistocene exhumation rates are also observed in the northern Sierra Pampeanas (1.5 km/Ma) that can be related to rock uplift along steep reverse faults coupled with high precipitation. South of 32°S on the western side, exhumation rates in the Principal Cordillera increased from ca. 0.25 km/Ma in the Miocene to rates locally exceeding 2 km/Ma in the Pleistocene. Whereas the tectonic regime in the southern Principal Cordillera remained unchanged since the late Miocene, these higher rates are likely associated with enhanced erosion resulting from intensified Pleistocene precipitation and glacial growth in this region, reinforced by isostatic rock uplift and active tectonics. Our study shows that the onset of exhumation correlates mainly with the initiation of horizontal shortening and crustal thickening, whereas the magnitude of exhumation is largely set by the amount of precipitation and glacial erosion and by the style of deformation, which is controlled by inherited structures and the amount of sediments in the foreland. In the following, we present new low-temperature thermochronological data (238 ages) that we complement with literature data (824 ages) to constrain the exhumation rate history of the Andean mountain belt at large temporal (Ma) and spatial scales (18 to 36°S). We focus on apatite and zircon fission track (AFT and ZFT, respe...

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Towards interactive global paleogeographic maps, new reconstructions at 60, 40 and 20 Ma

Poblete

Dupont‐Nivet

Licht

et al. 2021

Earth-Science Reviews

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Cenozoic tectonostratigraphic evolution and architecture of the Central Andes in northern Chile based on the Aquine region, Western Cordillera (19°-19º30’ S).

Cited by 11 publications

References 46 publications

Tectonic architecture of the Tarapacá Basin in the northern Central Andes: New constraints from field and 2D seismic data

Tectonic architecture of the Tarapacá Basin in the northern Central Andes: New constraints from field and 2D seismic data

The relationships between tectonics, climate and exhumation in the Central Andes (18–36°S): Evidence from low-temperature thermochronology

Towards interactive global paleogeographic maps, new reconstructions at 60, 40 and 20 Ma

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Cenozoic tectonostratigraphic evolution and architecture of the Central Andes in northern Chile based on the Aquine region, Western Cordillera (19°-19º30’ S).

Cited by 11 publications

References 46 publications

Tectonic architecture of the Tarapacá Basin in the northern Central Andes: New constraints from field and 2D seismic data

Tectonic architecture of the Tarapacá Basin in the northern Central Andes: New constraints from field and 2D seismic data

The relationships between tectonics, climate and exhumation in the Central Andes (18–36°S): Evidence from low-temperature thermochronology

Towards interactive global paleogeographic maps, new reconstructions at 60, 40 and 20 Ma

Contact Info

Product

Resources

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Towards interactive global paleogeographic maps, new reconstructions at 60, 40 and 20 Ma