Latitudinal and Longitudinal Patterns of Exhumation in the Andes of North-Central Chile

María Pía Rodríguez, Reynaldo Charrier, Stephanie Brichau, Sébastien Carretier, Marcelo Farías, Philippe de Parseval, Richard A. Ketcham

Resultado de la investigación: Article

3 Citas (Scopus)

Resumen

New thermochronometric data provide evidence for an along-strike diachronous building of the Andes in north-central Chile (28.5–32°S). Geochronological (U-Pb zircon) and thermochronological (apatite fission track and (U-Th)/He) analyses of rock units were obtained in west-to-east transects across the western topographic front. Thermal models indicate that the area west of the topographic front was little exhumed since approximately 45 Ma. To the east of the western topographic front, the Main Cordillera shows both latitudinal and longitudinal differences in exhumation patterns. North of 31.5°S, Cenozoic exhumation began before approximately 40–30 Ma at the western and eastern limits of the Main Cordillera, building the Incaic Range. Later, accelerated exhumation focused on the core of the Main Cordillera and in the Frontal Cordillera at approximately 22–14 Ma and approximately 7 Ma, respectively. South of 31.5°S, accelerated exhumation in the Main Cordillera occurred mainly around 22–14 Ma, after an initial Eocene phase, and the locus of exhumation moved eastward by the late Miocene. Whereas accelerated exhumation in the early to mid-Miocene correlates with the breakup of the Farallon Plate, late Miocene accelerated exhumation correlates with the onset of flat subduction. Latitudinal differences on the exhumation timing along the western topographic front of the Main Cordillera may be due to the absence of the Paleozoic crystalline core south of 31.5°S, which seems to have acted as a buttress for shortening during the Eocene.

Idioma originalEnglish
Páginas (desde-hasta)2863-2886
Número de páginas24
PublicaciónTectonics
Volumen37
N.º9
DOI
EstadoPublished - 1 sep 2018

Huella dactilar

Apatites
Chile
exhumation
Rocks
cordillera
Crystalline materials
Miocene
apatites
loci
fission
Eocene
time measurement
rocks
Hot Temperature
zircon
apatite
subduction
transect
Paleozoic

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Citar esto

Rodríguez, M. P., Charrier, R., Brichau, S., Carretier, S., Farías, M., de Parseval, P., & Ketcham, R. A. (2018). Latitudinal and Longitudinal Patterns of Exhumation in the Andes of North-Central Chile. Tectonics, 37(9), 2863-2886. https://doi.org/10.1029/2018TC004997
Rodríguez, María Pía ; Charrier, Reynaldo ; Brichau, Stephanie ; Carretier, Sébastien ; Farías, Marcelo ; de Parseval, Philippe ; Ketcham, Richard A. / Latitudinal and Longitudinal Patterns of Exhumation in the Andes of North-Central Chile. En: Tectonics. 2018 ; Vol. 37, N.º 9. pp. 2863-2886.
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abstract = "New thermochronometric data provide evidence for an along-strike diachronous building of the Andes in north-central Chile (28.5–32°S). Geochronological (U-Pb zircon) and thermochronological (apatite fission track and (U-Th)/He) analyses of rock units were obtained in west-to-east transects across the western topographic front. Thermal models indicate that the area west of the topographic front was little exhumed since approximately 45 Ma. To the east of the western topographic front, the Main Cordillera shows both latitudinal and longitudinal differences in exhumation patterns. North of 31.5°S, Cenozoic exhumation began before approximately 40–30 Ma at the western and eastern limits of the Main Cordillera, building the Incaic Range. Later, accelerated exhumation focused on the core of the Main Cordillera and in the Frontal Cordillera at approximately 22–14 Ma and approximately 7 Ma, respectively. South of 31.5°S, accelerated exhumation in the Main Cordillera occurred mainly around 22–14 Ma, after an initial Eocene phase, and the locus of exhumation moved eastward by the late Miocene. Whereas accelerated exhumation in the early to mid-Miocene correlates with the breakup of the Farallon Plate, late Miocene accelerated exhumation correlates with the onset of flat subduction. Latitudinal differences on the exhumation timing along the western topographic front of the Main Cordillera may be due to the absence of the Paleozoic crystalline core south of 31.5°S, which seems to have acted as a buttress for shortening during the Eocene.",
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Rodríguez, MP, Charrier, R, Brichau, S, Carretier, S, Farías, M, de Parseval, P & Ketcham, RA 2018, 'Latitudinal and Longitudinal Patterns of Exhumation in the Andes of North-Central Chile', Tectonics, vol. 37, n.º 9, pp. 2863-2886. https://doi.org/10.1029/2018TC004997

Latitudinal and Longitudinal Patterns of Exhumation in the Andes of North-Central Chile. / Rodríguez, María Pía; Charrier, Reynaldo; Brichau, Stephanie; Carretier, Sébastien; Farías, Marcelo; de Parseval, Philippe; Ketcham, Richard A.

En: Tectonics, Vol. 37, N.º 9, 01.09.2018, p. 2863-2886.

Resultado de la investigación: Article

TY - JOUR

T1 - Latitudinal and Longitudinal Patterns of Exhumation in the Andes of North-Central Chile

AU - Rodríguez, María Pía

AU - Charrier, Reynaldo

AU - Brichau, Stephanie

AU - Carretier, Sébastien

AU - Farías, Marcelo

AU - de Parseval, Philippe

AU - Ketcham, Richard A.

PY - 2018/9/1

Y1 - 2018/9/1

N2 - New thermochronometric data provide evidence for an along-strike diachronous building of the Andes in north-central Chile (28.5–32°S). Geochronological (U-Pb zircon) and thermochronological (apatite fission track and (U-Th)/He) analyses of rock units were obtained in west-to-east transects across the western topographic front. Thermal models indicate that the area west of the topographic front was little exhumed since approximately 45 Ma. To the east of the western topographic front, the Main Cordillera shows both latitudinal and longitudinal differences in exhumation patterns. North of 31.5°S, Cenozoic exhumation began before approximately 40–30 Ma at the western and eastern limits of the Main Cordillera, building the Incaic Range. Later, accelerated exhumation focused on the core of the Main Cordillera and in the Frontal Cordillera at approximately 22–14 Ma and approximately 7 Ma, respectively. South of 31.5°S, accelerated exhumation in the Main Cordillera occurred mainly around 22–14 Ma, after an initial Eocene phase, and the locus of exhumation moved eastward by the late Miocene. Whereas accelerated exhumation in the early to mid-Miocene correlates with the breakup of the Farallon Plate, late Miocene accelerated exhumation correlates with the onset of flat subduction. Latitudinal differences on the exhumation timing along the western topographic front of the Main Cordillera may be due to the absence of the Paleozoic crystalline core south of 31.5°S, which seems to have acted as a buttress for shortening during the Eocene.

AB - New thermochronometric data provide evidence for an along-strike diachronous building of the Andes in north-central Chile (28.5–32°S). Geochronological (U-Pb zircon) and thermochronological (apatite fission track and (U-Th)/He) analyses of rock units were obtained in west-to-east transects across the western topographic front. Thermal models indicate that the area west of the topographic front was little exhumed since approximately 45 Ma. To the east of the western topographic front, the Main Cordillera shows both latitudinal and longitudinal differences in exhumation patterns. North of 31.5°S, Cenozoic exhumation began before approximately 40–30 Ma at the western and eastern limits of the Main Cordillera, building the Incaic Range. Later, accelerated exhumation focused on the core of the Main Cordillera and in the Frontal Cordillera at approximately 22–14 Ma and approximately 7 Ma, respectively. South of 31.5°S, accelerated exhumation in the Main Cordillera occurred mainly around 22–14 Ma, after an initial Eocene phase, and the locus of exhumation moved eastward by the late Miocene. Whereas accelerated exhumation in the early to mid-Miocene correlates with the breakup of the Farallon Plate, late Miocene accelerated exhumation correlates with the onset of flat subduction. Latitudinal differences on the exhumation timing along the western topographic front of the Main Cordillera may be due to the absence of the Paleozoic crystalline core south of 31.5°S, which seems to have acted as a buttress for shortening during the Eocene.

KW - Chilean Andes

KW - early to middle Miocene deformation

KW - Eocene deformation

KW - late Miocene deformation

KW - spatial variation of exhumation patterns

KW - western topographic front of the Andes

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U2 - 10.1029/2018TC004997

DO - 10.1029/2018TC004997

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VL - 37

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JO - Tectonics

JF - Tectonics

SN - 0278-7407

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ER -

Rodríguez MP, Charrier R, Brichau S, Carretier S, Farías M, de Parseval P y otros. Latitudinal and Longitudinal Patterns of Exhumation in the Andes of North-Central Chile. Tectonics. 2018 sep 1;37(9):2863-2886. https://doi.org/10.1029/2018TC004997