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Abstract:

The Caucete Group and structurally overlying Pie de Palo Complex in western Argentina are characterised by two generations of west-verging folds and thrust-related shear zones, which formed under amphibolite facies conditions. The Caucete Group is separated from the Pie de Palo Complex by the Pirquitas thrust. These structures are interpreted to have formed as a result of a progressive deformation, generated during Middle Ordovician, underthrusting of the Laurentian-derived Cuyania microcontinent beneath the active Famatina margin. Geometrical relationships are most simply explained if the Pie de Palo Complex was basement to the Caucete Group prior to Ordovician orogenesis. We propose that this basement-cover relationship was established during Cambrian rifting of the Cuyania microcontinent from Laurentia. The Pirquitas fault may have been initiated during this extension prior to its long-lived remobilization as a thrust. We cannot rule out the possibility that the Pie de Palo Complex was exotic with respect to the Caucete Group, but for this to be possible we have to introduce an extra generation of structures, for which no evidence is preserved. The deformation was characterised by early strain localization followed by a more homogeneously distributed non-coaxial flow during F2. Thermal softening probably dominated over fabric softening during this stage. © 2010.

Registro:

Documento: Artículo
Título:An Alpine-style Ordovician collision complex in the Sierra de Pie de Palo, Argentina: Record of subduction of Cuyania beneath the Famatina arc
Autor:van Staal, C.R.; Vujovich, G.I.; Currie, K.L.; Naipauer, M.
Filiación:Geological Survey of Canada, 625 Robson Street, Vancouver, BC, Canada
CONICET, Buenos Aires, Argentina
Laboratorio de Tectonica Andina-FCEyN, Universidad de Buenos Aires, Pabellon II, Ciudad Universitaria, 1428-Buenos Aires, Argentina
Geological Survey of Canada, 601 Booth Street, Ottawa, ON, Canada
Palabras clave:Collision complex; Cuyania; Fold nappes; Subduction channel; Thrusts; Collision complex; Cuyania; Fold nappes; Subduction channel; Thrusts; Buildings; Deformation; amphibolite facies; collision; deformation; extensional tectonics; folding; nappe; Ordovician; orogeny; rifting; shear zone; subduction; Argentina; San Juan [Argentina]; Sierra de Pie de Palo; Sierras Pampeanas
Año:2011
Volumen:33
Número:3
Página de inicio:343
Página de fin:361
DOI: http://dx.doi.org/10.1016/j.jsg.2010.10.011
Título revista:Journal of Structural Geology
Título revista abreviado:J. Struct. Geol.
ISSN:01918141
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01918141_v33_n3_p343_vanStaal

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Citas:

---------- APA ----------
van Staal, C.R., Vujovich, G.I., Currie, K.L. & Naipauer, M. (2011) . An Alpine-style Ordovician collision complex in the Sierra de Pie de Palo, Argentina: Record of subduction of Cuyania beneath the Famatina arc. Journal of Structural Geology, 33(3), 343-361.
http://dx.doi.org/10.1016/j.jsg.2010.10.011
---------- CHICAGO ----------
van Staal, C.R., Vujovich, G.I., Currie, K.L., Naipauer, M. "An Alpine-style Ordovician collision complex in the Sierra de Pie de Palo, Argentina: Record of subduction of Cuyania beneath the Famatina arc" . Journal of Structural Geology 33, no. 3 (2011) : 343-361.
http://dx.doi.org/10.1016/j.jsg.2010.10.011
---------- MLA ----------
van Staal, C.R., Vujovich, G.I., Currie, K.L., Naipauer, M. "An Alpine-style Ordovician collision complex in the Sierra de Pie de Palo, Argentina: Record of subduction of Cuyania beneath the Famatina arc" . Journal of Structural Geology, vol. 33, no. 3, 2011, pp. 343-361.
http://dx.doi.org/10.1016/j.jsg.2010.10.011
---------- VANCOUVER ----------
van Staal, C.R., Vujovich, G.I., Currie, K.L., Naipauer, M. An Alpine-style Ordovician collision complex in the Sierra de Pie de Palo, Argentina: Record of subduction of Cuyania beneath the Famatina arc. J. Struct. Geol. 2011;33(3):343-361.
http://dx.doi.org/10.1016/j.jsg.2010.10.011