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Abstract:

The Aconcagua fold and thrust belt, located in the Andean mountains at 32°30′ to 34°S, has been described as a classic model of a thin-skinned thrust belt. However, new structural data from its southern sector have shown that it has a complex structural framework reflected in multiple Mesozoic extensional phases, overprinted by structural inversion, as well as thin- and thick-skinned tectonics. Two major superimposed extensional structural styles have been identified for the Mesozoic characterized by distinctly oriented stress fields. A key role in the evolution of this part of the fold and thrust belt was played by a Late Triassic to Early Jurassic depocentre and by Late Jurassic block faulting. Shortening was accommodated by a combination of inversion of pre-existing normal faults, development of footwall short cuts and both thin and thick-skinned thrusting. Synrift and postrift sedimentary rocks were uplifted by reactivation of normal faults, with further shortening along newly formed thin-skinned thrust faults. The geometry of thin-skinned fault systems is controlled by the architecture of the rift basin, competent footwalls forming barriers to the lateral propagation of detachments. © 2003 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:The control of pre-existing extensional structures on the evolution of the southern sector of the Aconcagua fold and thrust belt, southern Andes
Autor:Giambiagi, L.B.; Alvarez, P.P.; Godoy, E.; Ramos, V.A.
Filiación:Laboratorio de Tectonica Andina, Universidad de Buenos Aires, Ciudad Universitaria s/n, Capital Federal 1428, Argentina
Ctr. Reg. de Invest. Cie./Tecnol., Parque San Mart́n s/n, Mendoza 5500, Argentina
Servicio Nac. de Geologia y Mineria., Santiago, Casilla 10465, Chile
Palabras clave:Andes; Jurassic rift system; Neogene compression; Pre-existing structures; Structural evolution; extensional tectonics; faulting; fold and thrust belt; Mesozoic; stress field; tectonic evolution; thin skinned tectonics; Andes; Argentina; Chile
Año:2003
Volumen:369
Número:1-2
Página de inicio:1
Página de fin:19
DOI: http://dx.doi.org/10.1016/S0040-1951(03)00171-9
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics
ISSN:00401951
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v369_n1-2_p1_Giambiagi

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Citas:

---------- APA ----------
Giambiagi, L.B., Alvarez, P.P., Godoy, E. & Ramos, V.A. (2003) . The control of pre-existing extensional structures on the evolution of the southern sector of the Aconcagua fold and thrust belt, southern Andes. Tectonophysics, 369(1-2), 1-19.
http://dx.doi.org/10.1016/S0040-1951(03)00171-9
---------- CHICAGO ----------
Giambiagi, L.B., Alvarez, P.P., Godoy, E., Ramos, V.A. "The control of pre-existing extensional structures on the evolution of the southern sector of the Aconcagua fold and thrust belt, southern Andes" . Tectonophysics 369, no. 1-2 (2003) : 1-19.
http://dx.doi.org/10.1016/S0040-1951(03)00171-9
---------- MLA ----------
Giambiagi, L.B., Alvarez, P.P., Godoy, E., Ramos, V.A. "The control of pre-existing extensional structures on the evolution of the southern sector of the Aconcagua fold and thrust belt, southern Andes" . Tectonophysics, vol. 369, no. 1-2, 2003, pp. 1-19.
http://dx.doi.org/10.1016/S0040-1951(03)00171-9
---------- VANCOUVER ----------
Giambiagi, L.B., Alvarez, P.P., Godoy, E., Ramos, V.A. The control of pre-existing extensional structures on the evolution of the southern sector of the Aconcagua fold and thrust belt, southern Andes. Tectonophysics. 2003;369(1-2):1-19.
http://dx.doi.org/10.1016/S0040-1951(03)00171-9