Progression of deformation and sedimentation in the southernmost Andes

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 An...

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Autores principales:	Ghiglione, Matias, Ramos, Victor Alberto
Publicado:	2005
Materias:	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
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v405_n1-4_p25_Ghiglione http://hdl.handle.net/20.500.12110/paper_00401951_v405_n1-4_p25_Ghiglione
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	paper:paper_00401951_v405_n1-4_p25_Ghiglione2023-06-08T15:03:52Z Progression of deformation and sedimentation in the southernmost Andes Ghiglione, Matias Ramos, Victor Alberto 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 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. Fil:Ghiglione, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ramos, V.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v405_n1-4_p25_Ghiglione http://hdl.handle.net/20.500.12110/paper_00401951_v405_n1-4_p25_Ghiglione
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	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
spellingShingle	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 Ghiglione, Matias Ramos, Victor Alberto Progression of deformation and sedimentation in the southernmost Andes
topic_facet	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
description	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.
author	Ghiglione, Matias Ramos, Victor Alberto
author_facet	Ghiglione, Matias Ramos, Victor Alberto
author_sort	Ghiglione, Matias
title	Progression of deformation and sedimentation in the southernmost Andes
title_short	Progression of deformation and sedimentation in the southernmost Andes
title_full	Progression of deformation and sedimentation in the southernmost Andes
title_fullStr	Progression of deformation and sedimentation in the southernmost Andes
title_full_unstemmed	Progression of deformation and sedimentation in the southernmost Andes
title_sort	progression of deformation and sedimentation in the southernmost andes
publishDate	2005
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v405_n1-4_p25_Ghiglione http://hdl.handle.net/20.500.12110/paper_00401951_v405_n1-4_p25_Ghiglione
work_keys_str_mv	AT ghiglionematias progressionofdeformationandsedimentationinthesouthernmostandes AT ramosvictoralberto progressionofdeformationandsedimentationinthesouthernmostandes
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Progression of deformation and sedimentation in the southernmost Andes

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