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Abstract:

The chronology of thrust motion in the Fuegian thin-skinned fold-thrust belt was established using data from the Atlantic coast of Tierra del Fuego. A set of original structural-geological maps showing the distribution of structures, unconformities and synorogenic sequences in the last tip of the Andes reveals the cratonward propagation of thrusts and sedimentary depocenters. A succession of syntectonic angular and progressive unconformities occur in the studied zone: (1) an angular unconformity between Danian and Late Paleocene sequences, (2) a series of progressive and syntectonic angular unconformities developed from the Late Early Eocene to the Late Eocene, and (3) a Lower Miocene syntectonic unconformity. Additional evidence for the time-space location of the thrust-front is provided by the presence of seismically triggered sand intrusions in Late Cretaceous, Late Paleocene and Middle Miocene sequences. The integration of data shows that faulting occurred in three main episodes: San Vicente thrusting, ca. 61-55 Ma, Río Bueno thrusting, ca. 49-34, and Punta Gruesa strike-slip event, ca. 24-16 Ma. San Vicente thrusting represents the onset of thrust propagation onto the foreland craton. The thrust-front endured a major cratonward migration through the Río Bueno thrusting, and remained steady afterward. Punta Gruesa constitutes a strike-slip event, associated with the phase of wrench deformation that influences the southernmost Andes since the Oligocene. Although the overall pattern of faulting was progressively younger cratonward, several episodes of out-of-sequence thrusting and folding occurred. Other features in the southernmost Andes can be linked to these three deformation events to broadly characterize the behavior of the Fuegian orogenic wedge in terms of critical taper models. The Fuegian Andes underwent at least three cycles between subcritical, critical and supercritical stages of behavior in terms of deformation, erosion, and sedimentation. © 2005 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Progression of deformation and sedimentation in the southernmost Andes
Autor:Ghiglione, M.C.; Ramos, V.A.
Filiación:Laboratorio de Tectónica Andina, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina
Palabras clave:Chronology of thrust motion; Clastic dikes; Critical taper model; Crustal deformation; Foreland basins evolution; Fuegia Andes; Growth strata; Progressive and syntectonic angular unconformities; Southernmost Andes; basin evolution; crustal deformation; foreland basin; sedimentation; thrust fault; Andes; South America; Western Hemisphere; World
Año:2005
Volumen:405
Número:1-4
Página de inicio:25
Página de fin:46
DOI: http://dx.doi.org/10.1016/j.tecto.2005.05.004
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics
ISSN:00401951
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v405_n1-4_p25_Ghiglione

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Citas:

---------- APA ----------
Ghiglione, M.C. & Ramos, V.A. (2005) . Progression of deformation and sedimentation in the southernmost Andes. Tectonophysics, 405(1-4), 25-46.
http://dx.doi.org/10.1016/j.tecto.2005.05.004
---------- CHICAGO ----------
Ghiglione, M.C., Ramos, V.A. "Progression of deformation and sedimentation in the southernmost Andes" . Tectonophysics 405, no. 1-4 (2005) : 25-46.
http://dx.doi.org/10.1016/j.tecto.2005.05.004
---------- MLA ----------
Ghiglione, M.C., Ramos, V.A. "Progression of deformation and sedimentation in the southernmost Andes" . Tectonophysics, vol. 405, no. 1-4, 2005, pp. 25-46.
http://dx.doi.org/10.1016/j.tecto.2005.05.004
---------- VANCOUVER ----------
Ghiglione, M.C., Ramos, V.A. Progression of deformation and sedimentation in the southernmost Andes. Tectonophysics. 2005;405(1-4):25-46.
http://dx.doi.org/10.1016/j.tecto.2005.05.004