Pliocene extensional tectonics in the Eastern Central Patagonian Cordillera: Geochronological constraints and new field evidence

Yves Lagabrielle, Manuel Suárez, Jacques Malavieille, Diego Morata, Felipe Espinoza, René C. Maury, Bruno Scalabrino, Luis Barbero, Rita de la Cruz, Eduardo Rossello, Hervé Bellon

Resultado de la investigación: Review article

31 Citas (Scopus)

Resumen

Recent field work and review of radiometric data obtained from Neogene lavas and plutonic rocks exposed in the Eastern Central Patagonian Cordillera (46-48°S), which overlie subducted segments of the South Chile Ridge, suggest important Late Miocene to Pleistocene morphological changes in relation to base level variations and/or tectonic events. We present new field observations from a region south of Lago General Carrera-Buenos Aires, between the main Cordillera and the Meseta del Lago Buenos Aires, demonstrating that normal faulting controlled valley incisions and occurred during lava emplacement at 5-4 Ma and after 3 Ma. We also show that the 12 Ma basaltic flows of the Meseta del Lago Buenos Aires (∼2000 m a.s.l.) have been subjected to deep incision, with younger lavas dated at 1.2 Ma partially filling the valleys. These incisions are thought to reflect progressive eastward tilting of the entire meseta. Our new observations, together with additional features from Central Patagonia, strongly suggest that tectonic events led to a regional widespread morphological change after 5 Ma. The coincidence in time and space between the subduction of segments of the South Chile Ridge at 6 and 3 Ma causing opening of a slab window, and strong base level variations in the studied area, suggests a cause-and-effect relationship. In Central Patagonia, compressional tectonics ended well before extensional events reported here. Causes of uplift and further extension are probably completely disconnected. The uplift is purely tectonic in origin and occurred prior to the subduction of the South Chile Ridge. Extension should be a consequence of this subduction.

Idioma originalEnglish
Páginas (desde-hasta)413-424
Número de páginas12
PublicaciónTerra Nova
Volumen19
N.º6
DOI
EstadoPublished - 1 dic 2007

Huella dactilar

extensional tectonics
cordillera
Pliocene
tectonics
subduction
uplift
valley
plutonic rock
lava
fieldwork
Neogene
slab
faulting
emplacement
Miocene
Pleistocene

ASJC Scopus subject areas

  • Geology

Citar esto

Lagabrielle, Yves ; Suárez, Manuel ; Malavieille, Jacques ; Morata, Diego ; Espinoza, Felipe ; Maury, René C. ; Scalabrino, Bruno ; Barbero, Luis ; de la Cruz, Rita ; Rossello, Eduardo ; Bellon, Hervé. / Pliocene extensional tectonics in the Eastern Central Patagonian Cordillera : Geochronological constraints and new field evidence. En: Terra Nova. 2007 ; Vol. 19, N.º 6. pp. 413-424.
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abstract = "Recent field work and review of radiometric data obtained from Neogene lavas and plutonic rocks exposed in the Eastern Central Patagonian Cordillera (46-48°S), which overlie subducted segments of the South Chile Ridge, suggest important Late Miocene to Pleistocene morphological changes in relation to base level variations and/or tectonic events. We present new field observations from a region south of Lago General Carrera-Buenos Aires, between the main Cordillera and the Meseta del Lago Buenos Aires, demonstrating that normal faulting controlled valley incisions and occurred during lava emplacement at 5-4 Ma and after 3 Ma. We also show that the 12 Ma basaltic flows of the Meseta del Lago Buenos Aires (∼2000 m a.s.l.) have been subjected to deep incision, with younger lavas dated at 1.2 Ma partially filling the valleys. These incisions are thought to reflect progressive eastward tilting of the entire meseta. Our new observations, together with additional features from Central Patagonia, strongly suggest that tectonic events led to a regional widespread morphological change after 5 Ma. The coincidence in time and space between the subduction of segments of the South Chile Ridge at 6 and 3 Ma causing opening of a slab window, and strong base level variations in the studied area, suggests a cause-and-effect relationship. In Central Patagonia, compressional tectonics ended well before extensional events reported here. Causes of uplift and further extension are probably completely disconnected. The uplift is purely tectonic in origin and occurred prior to the subduction of the South Chile Ridge. Extension should be a consequence of this subduction.",
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Lagabrielle, Y, Suárez, M, Malavieille, J, Morata, D, Espinoza, F, Maury, RC, Scalabrino, B, Barbero, L, de la Cruz, R, Rossello, E & Bellon, H 2007, 'Pliocene extensional tectonics in the Eastern Central Patagonian Cordillera: Geochronological constraints and new field evidence', Terra Nova, vol. 19, n.º 6, pp. 413-424. https://doi.org/10.1111/j.1365-3121.2007.00766.x

Pliocene extensional tectonics in the Eastern Central Patagonian Cordillera : Geochronological constraints and new field evidence. / Lagabrielle, Yves; Suárez, Manuel; Malavieille, Jacques; Morata, Diego; Espinoza, Felipe; Maury, René C.; Scalabrino, Bruno; Barbero, Luis; de la Cruz, Rita; Rossello, Eduardo; Bellon, Hervé.

En: Terra Nova, Vol. 19, N.º 6, 01.12.2007, p. 413-424.

Resultado de la investigación: Review article

TY - JOUR

T1 - Pliocene extensional tectonics in the Eastern Central Patagonian Cordillera

T2 - Geochronological constraints and new field evidence

AU - Lagabrielle, Yves

AU - Suárez, Manuel

AU - Malavieille, Jacques

AU - Morata, Diego

AU - Espinoza, Felipe

AU - Maury, René C.

AU - Scalabrino, Bruno

AU - Barbero, Luis

AU - de la Cruz, Rita

AU - Rossello, Eduardo

AU - Bellon, Hervé

PY - 2007/12/1

Y1 - 2007/12/1

N2 - Recent field work and review of radiometric data obtained from Neogene lavas and plutonic rocks exposed in the Eastern Central Patagonian Cordillera (46-48°S), which overlie subducted segments of the South Chile Ridge, suggest important Late Miocene to Pleistocene morphological changes in relation to base level variations and/or tectonic events. We present new field observations from a region south of Lago General Carrera-Buenos Aires, between the main Cordillera and the Meseta del Lago Buenos Aires, demonstrating that normal faulting controlled valley incisions and occurred during lava emplacement at 5-4 Ma and after 3 Ma. We also show that the 12 Ma basaltic flows of the Meseta del Lago Buenos Aires (∼2000 m a.s.l.) have been subjected to deep incision, with younger lavas dated at 1.2 Ma partially filling the valleys. These incisions are thought to reflect progressive eastward tilting of the entire meseta. Our new observations, together with additional features from Central Patagonia, strongly suggest that tectonic events led to a regional widespread morphological change after 5 Ma. The coincidence in time and space between the subduction of segments of the South Chile Ridge at 6 and 3 Ma causing opening of a slab window, and strong base level variations in the studied area, suggests a cause-and-effect relationship. In Central Patagonia, compressional tectonics ended well before extensional events reported here. Causes of uplift and further extension are probably completely disconnected. The uplift is purely tectonic in origin and occurred prior to the subduction of the South Chile Ridge. Extension should be a consequence of this subduction.

AB - Recent field work and review of radiometric data obtained from Neogene lavas and plutonic rocks exposed in the Eastern Central Patagonian Cordillera (46-48°S), which overlie subducted segments of the South Chile Ridge, suggest important Late Miocene to Pleistocene morphological changes in relation to base level variations and/or tectonic events. We present new field observations from a region south of Lago General Carrera-Buenos Aires, between the main Cordillera and the Meseta del Lago Buenos Aires, demonstrating that normal faulting controlled valley incisions and occurred during lava emplacement at 5-4 Ma and after 3 Ma. We also show that the 12 Ma basaltic flows of the Meseta del Lago Buenos Aires (∼2000 m a.s.l.) have been subjected to deep incision, with younger lavas dated at 1.2 Ma partially filling the valleys. These incisions are thought to reflect progressive eastward tilting of the entire meseta. Our new observations, together with additional features from Central Patagonia, strongly suggest that tectonic events led to a regional widespread morphological change after 5 Ma. The coincidence in time and space between the subduction of segments of the South Chile Ridge at 6 and 3 Ma causing opening of a slab window, and strong base level variations in the studied area, suggests a cause-and-effect relationship. In Central Patagonia, compressional tectonics ended well before extensional events reported here. Causes of uplift and further extension are probably completely disconnected. The uplift is purely tectonic in origin and occurred prior to the subduction of the South Chile Ridge. Extension should be a consequence of this subduction.

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