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Abstract:

The kinematic evolution of the enigmatic arc-shaped southernmost Andes of Patagonia and Tierra del Fuego has been a subject of debate for most of the past century. We compared the results from analog sandbox experiments with the tectonic evolution and actual configuration of the mountain chain in order to elucidate whether oroclinal bending took place during the Tertiary, or if the southernmost Andes have been a curved orogen since at least Late Cretaceous time. Experiments simulating oroclinal rotation produced strong along-strike variations in shortening and failed to account for structural data compiled from the Fuegian Andes. Results from experiments simulating an L-shaped, concave-to-foreland indenter were in agreement with the known Tertiary structural evolution of the southernmost Andes. The diachronicity of principal shortening events previously recognized in Patagonia and Tierra del Fuego could only be reproduced by moving the indenter in two successive orthogonal directions: first approximately northward to form the Fuegian fold-and-thrust belt, and then approximately eastward to propagate thrusting in the Patagonian Andes. This two-phase evolution is consistent with a recorded change in the convergence direction of the Farallon-Nazca plate that occurred at ca. 27 Ma. © 2007 Geological Society of America.

Registro:

Documento: Artículo
Título:Have the southernmost Andes been curved since Late Cretaceous time? An analog test for the Patagonian Orocline
Autor:Ghiglione, M.C.; Cristallini, E.O.
Filiación:Laboratorio de Tectóníca Andina, Universidad de Bueno Aires, Ciudad Universitaria, Avda. Rivadavia 1917, Ciudad de Buenos Aires, Argentina
Laboratorio de Modelado Geológico (LaMoGe), Universidad de Bueno Aires, Ciudad Universitaria, Avda. Rivadavia 1917, Ciudad de Buenos Aires, Argentina
Palabras clave:Arcurate structures; Oroclines; Patagonian Andes; Sand analog experiments; Tierra del Fuego; Oroclinal rotation; Structural evolution; Tectonic evolution; Geochronology; Landforms; Structural geology; Tectonics; bending; fold and thrust belt; Nazca plate; structural geology; tectonic evolution; Tertiary; Andes; Patagonia; South America; Tierra del Fuego [(ARC) South America]
Año:2007
Volumen:35
Número:1
Página de inicio:13
Página de fin:16
DOI: http://dx.doi.org/10.1130/G22770A.1
Título revista:Geology
Título revista abreviado:Geology
ISSN:00917613
CODEN:GLGYB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00917613_v35_n1_p13_Ghiglione

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Citas:

---------- APA ----------
Ghiglione, M.C. & Cristallini, E.O. (2007) . Have the southernmost Andes been curved since Late Cretaceous time? An analog test for the Patagonian Orocline. Geology, 35(1), 13-16.
http://dx.doi.org/10.1130/G22770A.1
---------- CHICAGO ----------
Ghiglione, M.C., Cristallini, E.O. "Have the southernmost Andes been curved since Late Cretaceous time? An analog test for the Patagonian Orocline" . Geology 35, no. 1 (2007) : 13-16.
http://dx.doi.org/10.1130/G22770A.1
---------- MLA ----------
Ghiglione, M.C., Cristallini, E.O. "Have the southernmost Andes been curved since Late Cretaceous time? An analog test for the Patagonian Orocline" . Geology, vol. 35, no. 1, 2007, pp. 13-16.
http://dx.doi.org/10.1130/G22770A.1
---------- VANCOUVER ----------
Ghiglione, M.C., Cristallini, E.O. Have the southernmost Andes been curved since Late Cretaceous time? An analog test for the Patagonian Orocline. Geology. 2007;35(1):13-16.
http://dx.doi.org/10.1130/G22770A.1