Structural evolution of the Argentine precordillera: the Rio San Juan section

Gosen, Werner von

doi:10.1016/0191-8141(92)90124-f

Cited by 124 publications

(110 citation statements)

References 20 publications

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“…The era, where Devonian and Carboniferous rocks show an erosional disconformity (von Gosen, 1992). Therefore, the westdirected vergence of the Chanic structures in the study area confirms that this part of the Frontal Cordillera represents the western branch of the Chanic orogen.…”

Section: Geotectonic Implicationssupporting

confidence: 51%

The Palaeozoic basement of the Andean Frontal Cordillera at 34º S (Cordón del Carrizalito, Mendoza Province, Argentina): Geotectonic implications

Garcı́a-Sansegundo

Farias

Rubio-Ordóñez

et al. 2014

Journal of Iberian Geology

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The Cordón del Carrizalito is located in the southern sector of the Andean Frontal Cordillera. In this area, the Andean basement is composed of meta-sedimentary rocks (Las Lagunitas Formation) of Ordovician age. In addition, no-or very low grade metamorphism and less deformed rocks also occur in the study area. We call these rocks Selerpe series, whose characteristics are comparable to other series, late Carboniferous in age, described in nearby areas. The Las Lagunitas Formation is affected by west-verging folds, developed under low-grade metamorphic conditions. These structures can be attributed to the Chanic orogeny (Late Devonian -early Carboniferous). The Selerpe series and Las Lagunitas Formation are deformed by east-verging thrusts and folds developed in narrow bands and generated in the absence or under very low metamorphic conditions. These structures always deform the Chanic structures, and are attributed to the Gondwanan deformation (San Rafael orogeny, late Carboniferous -Permian in age). The Chanic structures of the study area can be placed in the western branch and in the hinterland of the Chanic orogen, which was developed as a result of the accretion of the Chilenia terrane at the west Gondwana margin during Late Devonian and early Carboniferous. The eastern branch of this orogen is located in the Andean Precordillera. The Permo-Triassic cover, deformed by the Andean orogenic cycle (Mesozoic -Cenozoic), rests unconformably on the Palaeozoic basement rocks.Keywords: Palaeozoic basement, Chanic orogeny, Gondwanan deformation, Andes, Argentina Resumen En el Cordón del Carrizalito, situado en el sector meridional de la Cordillera Frontal de los Andes, afloran metasedimentos ordovícicos pertenecientes a la Formación Las Lagunitas y otro conjunto de rocas menos deformadas, en ausencia de metamorfismo o con metamorfismo de muy bajo grado, que hemos denominado serie de Selerpe. Esta última es litoestratigráficamente comparable a series del Carbonífero superior descritas en áreas próximas. La Formación Las Lagunitas está afectada por pliegues apretados, vergentes al oeste y desarrollados bajo condiciones de metamorfismo de bajo grado. Estas estructuras pueden ser atribuidas a la orogenia Chánica (Devónico Superior -Carbonífero inferior). La deformación Gondwánica, atribuida a la orogenia San Rafael, (Carbonífero superior -Pérmico), afecta tanto a la serie de Selerpe como a la Formación Las Lagunitas y se caracteriza por cabalgamientos y pliegues vergentes al este y generados en ausencia de metamorfismo o bajo condiciones metamórficas de muy grado bajo. Las estructuras chánicas de la zona estudiada se encuentran en las zonas internas de la rama occidental del orógeno del mismo nombre. Estas estructuras se desarrollaron como resultado de la acreción del terreno de Chilenia al margen occidental del antiguo continente de Gondwana durante el Devónico Superior -Carbonífero inferior. La rama oriental del orógeno Chánico se sitúa en la Precordillera andina. La cobertera permo-triásica, deformada durante e...

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Section: Geotectonic Implicationssupporting

confidence: 51%

The Palaeozoic basement of the Andean Frontal Cordillera at 34º S (Cordón del Carrizalito, Mendoza Province, Argentina): Geotectonic implications

Garcı́a-Sansegundo

Farias

Rubio-Ordóñez

et al. 2014

Journal of Iberian Geology

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“…On the other hand the presence in the Frontal Cordillera, further to the south and east, of high-grade metamorphic rocks (Bjerg et al, 1990) and granitoids Tickyj, 2011) of Early Devonian to Early Carboniferous age, point to the presence of the Chanic Orogen hinterland in the eastern Frontal Cordillera. In contrast, the Chanic structures in the Central and Western Precordillera show a general vergence towards the east (Davis et al, 1999;Álvarez Marrón et al, 2006;Alonso et al, 2008) and the metamorphic grade increases westward (Von Gosen, 1992), as it might be expected from its location on the Gondwana passive margin (Alonso et al, 2008), prior to the collision of Chilenia (Fig. 11A).…”

Section: Proposal Of Geodynamic Evolution During the Late Paleozoicmentioning

confidence: 90%

The Basement of the Andean Frontal Cordillera in the Cordón del Plata (Mendoza, Argentina): Geodynamic Evolution

Heredia

Farias

Garcı́a-Sansegundo

et al. 2012

andgeo

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ABSTRACT. The Andean Paleozoic basement of the Cordón del Plata (Argentina) consists of two sets of rocks showing different stratigraphy, structure and metamorphism. The lower one is represented by the pre-Carboniferous (Devonian?) Vallecitos beds. These rocks have been affected by folds and associated cleavage, developed under low-grade metamorphic conditions and related to the Chanic orogenic event of the Famatinian Orogenic Cycle (Upper Devonian-Lower Carboniferous). The Vallecitos beds is pre-orogenic to the Chanic deformation event and must have been deposited in a fore-arc basin located on the active margin of Chilenia, before its collision with the passive margin of Gondwana. The upper set unconformably rests on the Vallecitos beds and consists of the Late Carboniferous El Plata Formation, and the Río Blanco Conglomerates, probably Late Carboniferous-Permian in age. These rocks have been affected by eastdirected thrusts and associated folds formed under very low-grade to non-metamorphic conditions. This deformation can be related to the San Rafael phase (Gondwanan Orogen). The El Plata Formation was deposited in an extensional back-arc basin while the Río Blanco conglomerates must have been deposited in a retro-arc basin, both of them on the active margin of Gondwana. The Choiyoi Group, essentially volcanic and Permo-Triasic in age, rests unconformably on the previously described successions and was deposited in an extensional setting (pre-orogenic stage) associated with the beginning of the Andean Cycle. This cycle lead to the uplift of the Frontal Cordillera during the Cenozoic and the deposition of thick continental units at the base of the Cordón del Plata in Neogene-Quaternary times.

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“…Little direct evidence of related contraction has been documented involving the lower Paleozoic stratigraphy preserved in the Precordillera terrane with the exception of pre-Carboniferous west vergent duplexes affecting Ordovician limestones in the eastern Precordillera [von Gosen, 1992] and thin-skinned west vergent thrusts affecting the same limestone succession in the northern Precordillera [Astini, 1991[Astini, , 1992Thomas et al, 2002]. Within the back arc region, however, apart from the shear zones described within the Sierras Pampeanas and Famatina regions [Martino et al, 1993a[Martino et al, , 1993bMartino and Astini, 1998a;Northrup et al, 1998;Simpson et al, 1998Simpson et al, , 2003Conci et al, 2001;Whitmeyer and Simpson, 2004], no higher level structures have been associated to the Ocloyic deformation.…”

Section: Introductionmentioning

confidence: 99%

Ordovician back arc foreland and Ocloyic thrust belt development on the western Gondwana margin as a response to Precordillera terrane accretion

2004

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The Famatina belt, southern central Andes, records a circa 470 m.y. shortening episode (Ocloyic orogeny) affecting the peri‐Gondwanan back arc basin in response to the accretion of the Precordillera terrane. Collision created distinct features across and along the margin, some of which persisted into the present Andean structure. From east to west, the Ocloyic deformation is recorded across the telescoped region of Famatina, represented by (1) an east vergent fold‐thrust belt (EVFTB) involving a major angular unconformity between Early and Middle Ordovician rocks, (2) a highly deformed volcano‐sedimentary belt, and (3) an east vergent ductile shear zone affecting Famatinian granites. Axis attitudes of Ordovician refolded anticlines in the EVFTB show west‐east tectonic transport, in agreement with kinematics of Ocloyic high‐strain belts, indicating shortening orthogonal to the present Pacific margin. Eastward displacement of the Ordovician volcanic arc at ∼27°S latitude together with a documented sinistral slip zone across the proto‐Andean margin suggests tectonic indentation.

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Structural evolution of the Argentine precordillera: the Rio San Juan section

Cited by 124 publications

References 20 publications

The Palaeozoic basement of the Andean Frontal Cordillera at 34º S (Cordón del Carrizalito, Mendoza Province, Argentina): Geotectonic implications

The Palaeozoic basement of the Andean Frontal Cordillera at 34º S (Cordón del Carrizalito, Mendoza Province, Argentina): Geotectonic implications

The Basement of the Andean Frontal Cordillera in the Cordón del Plata (Mendoza, Argentina): Geodynamic Evolution

Ordovician back arc foreland and Ocloyic thrust belt development on the western Gondwana margin as a response to Precordillera terrane accretion

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