An Alpine-style Ordovician collision complex in the Sierra de Pie de Palo, Argentina: Record of subduction of Cuyania beneath the Famatina arc
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 Pirqui...
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todo:paper_01918141_v33_n3_p343_vanStaal2023-10-03T15:09:03Z An Alpine-style Ordovician collision complex in the Sierra de Pie de Palo, Argentina: Record of subduction of Cuyania beneath the Famatina arc van Staal, C.R. Vujovich, G.I. Currie, K.L. Naipauer, M. 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 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. Fil:Vujovich, G.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Naipauer, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01918141_v33_n3_p343_vanStaal |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 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 |
| topic_facet |
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 |
| description |
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. |
| format |
JOUR |
| author |
van Staal, C.R. Vujovich, G.I. Currie, K.L. Naipauer, M. |
| author_facet |
van Staal, C.R. Vujovich, G.I. Currie, K.L. Naipauer, M. |
| author_sort |
van Staal, C.R. |
| title |
An Alpine-style Ordovician collision complex in the Sierra de Pie de Palo, Argentina: Record of subduction of Cuyania beneath the Famatina arc |
| title_short |
An Alpine-style Ordovician collision complex in the Sierra de Pie de Palo, Argentina: Record of subduction of Cuyania beneath the Famatina arc |
| title_full |
An Alpine-style Ordovician collision complex in the Sierra de Pie de Palo, Argentina: Record of subduction of Cuyania beneath the Famatina arc |
| title_fullStr |
An Alpine-style Ordovician collision complex in the Sierra de Pie de Palo, Argentina: Record of subduction of Cuyania beneath the Famatina arc |
| title_full_unstemmed |
An Alpine-style Ordovician collision complex in the Sierra de Pie de Palo, Argentina: Record of subduction of Cuyania beneath the Famatina arc |
| title_sort |
alpine-style ordovician collision complex in the sierra de pie de palo, argentina: record of subduction of cuyania beneath the famatina arc |
| url |
http://hdl.handle.net/20.500.12110/paper_01918141_v33_n3_p343_vanStaal |
| work_keys_str_mv |
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| _version_ |
1807316983055646720 |