Artículo
Abstract:
The orogenic volume of the Andes is the result of the equilibrium between the tectonic uplift and erosion. The different rates of shortening along the western margin of the South American continent have defined contrasting morphostructural settings. The orogenic volume along the southern Central Andes and northern Patagonian Andes (20°-46°S) decreases linearly, from north to south. At 38°S, we have separated two segments with different rates of variation in the Andean volume. The northern sector (20°-38°S) shows a steeper linear law than the southern sector. Even though the Andean volume varies together with the decrease from north to south of the subducted oceanic slab age, latitude 38°S coincides with a sudden change related to this late parameter. This observation has led us to propose a linkage between subducted parameters and variation of Andean volume, which contrasts with other hypotheses that assume that climate, is the principal cause for the variations in the observed orogenic volume. We also present two empiric equations to calculate the orogenic volume at determined latitude, beyond the area of influence of two anomalies centered around 27°S and 33°S respectively. Those sectors are considered to be influenced by other factors related to isostatic rebounds, superposed to shortening. Additionally, we discuss a law for the latitudinal variation of the orogenic shortening away from the location of the mentioned anomalies. © 2005 Asociación Geológica Argentina.
Registro:
| Documento: | Artículo |
| Título: | Model for Andean orogenic volume variation and shortening in the 20°-46°S sector |
| Autor: | Pose, F.A.; Spagnuolo, M.; Folguera, A. |
| Filiación: | Laboratorio de Tectónica Andina, Departamento de Geologia, Intendente Güiraldes, 2160, C1428EHA Buenos Aires, Argentina |
| Palabras clave: | Andes; Climatic control; Orogenic volume; Shortening; Strain partitioning; Andean orogeny; continental margin; crustal shortening; empirical analysis; erosion; isostasy; latitudinal gradient; model; morphostructure; slab; strain partitioning; subduction; uplift; volume change; Andes; Patagonia; South America |
| Año: | 2005 |
| Volumen: | 60 |
| Número: | 4 |
| Página de inicio: | 724 |
| Página de fin: | 730 |
| Título revista: | Revista de la Asociacion Geologica Argentina |
| Título revista abreviado: | Rev. Asoc. Geol. Argent. |
| ISSN: | 00044822 |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v60_n4_p724_Pose |
Referencias:
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- Evenstar, L., Hartley, A.J, Rice, C.M., Stuart, F., Mather, A.E. y Chong, G. 2005. Miocene-Pliocene climate change in the Peru-Chile Desert. 6 th International Symposium on Andean Geodynamics. Extended Abstracts: 258-260, Barcelona; Hartley A. J. 2005. What cause Andean uplift? 6th International Symposium on Andean Geodynamics. Extended Abstracts: 824-827, Barcelona; Folguera, A., Ramos, V.A., Distribución de la deformación en los Andes australes (33°-46°S) (2001) Publicación Especial Serie D, 5, pp. 13-18. , Asociación Geológica Argentina
- Inrocaso, A., Pacino, M.A., Guspi, F., The Andes of Argentina and Chile: Crustal configuration, isostasy, shortening and tectonic features from gravity data (2000) Temas de geociencia, 5. , 31 pp, UNR Editora, Rosario
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- Pose, F., Spagnuolo, M., Folguera, A y Ramos, V.A. 2004. Controles en la variación del volumen orogénico andino entre los 15 y 48° S. Serie Especial de la Revista de la Asociación Geológica Argentina con resúmenes extendidos de la 12a Reunión sobre microtectónica y geología estructural (Cafayate) (en prensa); Ramos, V.A., Zapata, T., Cristallini, E. e Introcaso, A. 2004. The Andean thrust system: Latitudinal variations in structural styles and orogenic shortening. En K.R. McClay (ed.) Thrusts Tectonics and hydrocarbon systems. American Association of Petroleum Geologists, Memoir 82: 30-50; Sotnoza, R., Updated Nazca (Farallon) - South America relative motions during the last 40 My: Implications for mountain building in the Central Andean region (1998) Journal of South American Earth Sciences, 11, pp. 211-215
- Spagnuolo, M.; Pose, F.; Folguera, A. y Ramos, V.A. 2005. Controls in Andean between 20 and 48°S. 6th International Symposium on Andean Geodynamics. Extended Abstracts: 697-700, Barcelona; von Huene, R., Ranero, C.R., Subduction erosion and basal friction along the sediment-starved convergent margin of Antofagasta, Chile (2003) Journal of Geophysical Research, 108 (B2), p. 2079. , doi:10.10129/2001JB001569
Citas:
---------- APA ----------
Pose, F.A., Spagnuolo, M. & Folguera, A. (2005) . Model for Andean orogenic volume variation and shortening in the 20°-46°S sector . Revista de la Asociacion Geologica Argentina, 60(4), 724-730.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v60_n4_p724_Pose [ ]
---------- CHICAGO ----------
Pose, F.A., Spagnuolo, M., Folguera, A. "Model for Andean orogenic volume variation and shortening in the 20°-46°S sector " . Revista de la Asociacion Geologica Argentina 60, no. 4 (2005) : 724-730.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v60_n4_p724_Pose [ ]
---------- MLA ----------
Pose, F.A., Spagnuolo, M., Folguera, A. "Model for Andean orogenic volume variation and shortening in the 20°-46°S sector " . Revista de la Asociacion Geologica Argentina, vol. 60, no. 4, 2005, pp. 724-730.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v60_n4_p724_Pose [ ]
---------- VANCOUVER ----------
Pose, F.A., Spagnuolo, M., Folguera, A. Model for Andean orogenic volume variation and shortening in the 20°-46°S sector . Rev. Asoc. Geol. Argent. 2005;60(4):724-730.Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v60_n4_p724_Pose [ ]
