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Abstract:

The Neuquén Andes between 36 and 39°S were built by a broad range of processes during the last 30 Ma. Periods of deformation can be classified in two alternating types: periods of extension associated with homogeneous shear parallel to the trench, whose strain encompassed areas hundreds of kilometers wide, and periods of discrete strike-slip fault displacements in the inner orogenic domains associated with uplift of retroarc mountains constructed by stacking of upper crustal thrust sheets. Extension-transtension (?) dominated the upper crust in the Neuquén Andes between 28 and 15 Ma and the arc was the locus of small volcanogenic basins in a belt over 100 kilometers wide perpendicular to the trench. Later, at 12-10 (5) Ma, the arc contracted, with the intrusion of large volumes of magma along strike-slip lithospheric systems, and intra-arc basin formation was inhibited. Meanwhile, the retroarc was deformed by pure shear perpendicular to the plate margin, which triggered basin inversion. Finally, after 5 Ma, conditions became more like those at 28-15 Ma, in which homogeneous transtension affected broad areas over 50 kilometers wide. Strain partitioning controls the distribution of the shear component, which is linked to the parallel component of convergence, either in discrete or broad areas of deformation, thereby acting as one variable that defined the availability of basin formation processes along the arc. Steepening and flattening of the Wadati-Benioff zones locally controlled the strain partitioning behavior of the upper crust in the Andes between 36° and 39°S. Discrete periods of accumulation of large volumes of volcanic materials in the inner domains of the orogen, contemporaneous with steep subduction, alternated with periods of arc-related intrusions along discrete strike-slip systems, during more shallowly dipping subduction. © 2005 Servicio Nacional de Geología y Minería.

Registro:

Documento: Artículo
Título:Strain partitioning along the arc in the Neuquén Andes (36-39°S) for the last 30 million years
Autor:Folguera, A.; Ramos, V.A.; Melnick, D.
Filiación:Laboratorio de Tectónica Andina, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina
Departamento de Ciencias de la Tierra, Universidad de Concepción, Barrio Universitario s/n, Concepción, Chile
GeoforschungsZentrum Potsdam, Telegrafenberg A17, D-14473 Potsdam, Germany
Palabras clave:Northern Patagonian Andes; Oblique subduction; Strain partitioning; Volcanic arc; Wadati-Benioff changes; Cenozoic; crustal evolution; strain partitioning; subduction zone; volcanism; Andes; Argentina; Neuquen; South America
Año:2002
Volumen:29
Número:2
Título revista:Revista Geologica de Chile
Título revista abreviado:Rev. Geol. Chile
ISSN:07160208
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07160208_v29_n2_p_Folguera

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Citas:

---------- APA ----------
Folguera, A., Ramos, V.A. & Melnick, D. (2002) . Strain partitioning along the arc in the Neuquén Andes (36-39°S) for the last 30 million years . Revista Geologica de Chile, 29(2).
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07160208_v29_n2_p_Folguera [ ]
---------- CHICAGO ----------
Folguera, A., Ramos, V.A., Melnick, D. "Strain partitioning along the arc in the Neuquén Andes (36-39°S) for the last 30 million years " . Revista Geologica de Chile 29, no. 2 (2002).
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07160208_v29_n2_p_Folguera [ ]
---------- MLA ----------
Folguera, A., Ramos, V.A., Melnick, D. "Strain partitioning along the arc in the Neuquén Andes (36-39°S) for the last 30 million years " . Revista Geologica de Chile, vol. 29, no. 2, 2002.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07160208_v29_n2_p_Folguera [ ]
---------- VANCOUVER ----------
Folguera, A., Ramos, V.A., Melnick, D. Strain partitioning along the arc in the Neuquén Andes (36-39°S) for the last 30 million years . Rev. Geol. Chile. 2002;29(2).
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07160208_v29_n2_p_Folguera [ ]