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Abstract:

New Late cretaceous to Recent reconstructions between south America and me oceanic plates in the Pacific basin allow thedivision of the corresponding convergence History into three stages, The convergence parameters for the 72-47 Ma time span suggest the migration of the Farallón-South America-Aluk triple junction from northern Chile (southern Perú?) up to the southern Patagonian Andes. Some deformational and magmatic events in the upper plate could be attributed to subduction of the Farallón-Aluk ridge by those times. The 47-28 Ma stage is characterized by subduction of Farallón plate in most (all?) of the margin. The convergence rate and direction remained almost constant during this stage. The 26-0 Ma stage corresponds to the subduction of Nazca plate beneath most of the South American trench. The beginning of this stage coincides with a strong increase in convergence rate which gradually decreased during the last 10 m.y., whereas the direction of convergence remained rather constant during the entire stage. Variations of subduction rate during this younger stage may be related with some deformational and magmatic events in the upper plate, including the uplift of the Central Andes. © 2005 Asociación Geológica Argentina.

Registro:

Documento: Artículo
Título:Convergence in the western margin of South America during the Cenozoic: Subduction of Nazca, Farallon and Aluk plates
Autor:Somoza, R.; Ghidella, M.E.
Filiación:CONICET, Departamento de Ciencias Geológicas, Ciudad Universitaria, C1428EHA, Buenos Aires, Argentina
Instituto Antártìco Argentino, Argentina
Palabras clave:Convergence; Late cretaceous-cenozoic; South america; Cenozoic; convergent margin; Cretaceous; deformation; magmatism; Nazca plate; reconstruction; subduction; trench; triple junction; uplift; Andes; Chile; Patagonia; South America
Año:2005
Volumen:60
Número:4
Página de inicio:797
Página de fin:809
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_p797_Somoza

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Citas:

---------- APA ----------
Somoza, R. & Ghidella, M.E. (2005) . Convergence in the western margin of South America during the Cenozoic: Subduction of Nazca, Farallon and Aluk plates . Revista de la Asociacion Geologica Argentina, 60(4), 797-809.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v60_n4_p797_Somoza [ ]
---------- CHICAGO ----------
Somoza, R., Ghidella, M.E. "Convergence in the western margin of South America during the Cenozoic: Subduction of Nazca, Farallon and Aluk plates " . Revista de la Asociacion Geologica Argentina 60, no. 4 (2005) : 797-809.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v60_n4_p797_Somoza [ ]
---------- MLA ----------
Somoza, R., Ghidella, M.E. "Convergence in the western margin of South America during the Cenozoic: Subduction of Nazca, Farallon and Aluk plates " . Revista de la Asociacion Geologica Argentina, vol. 60, no. 4, 2005, pp. 797-809.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v60_n4_p797_Somoza [ ]
---------- VANCOUVER ----------
Somoza, R., Ghidella, M.E. Convergence in the western margin of South America during the Cenozoic: Subduction of Nazca, Farallon and Aluk plates . Rev. Asoc. Geol. Argent. 2005;60(4):797-809.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v60_n4_p797_Somoza [ ]