Geophysical modeling and structure of Ushuaia Pluton, Fuegian Andes, Argentina

Within the area of Ushuaia Bay (Tierra del Fuego, southernmost South America) the deformed Lower Cretaceous sedimentary rocks of Yahgán Formation host the Ushuaia Pluton. The intrusive body is oval in map view; it is compositionally varied with rocks ranging from the ultrabasic to the mesosiliceous...

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Autores principales:	Peroni, J.I., Tassone, A.A., Menichetti, M., Cerredo, M.E.
Formato:	JOUR
Materias:	Magnetic modeling Pluton emplacement Strike-slip activity Tierra del Fuego Aeromagnetic data Argentina Cenomanian Central zone Fault system Geophysical modeling Geophysical models Late cretaceous Lower Cretaceous Modeling results New model Normal faults South America Geophysics Sedimentology Structural geology Sedimentary rocks Albian continental margin deformation emplacement extensional tectonics magnetic method normal fault pluton potassium-argon dating rock microstructure strike-slip fault Tierra del Fuego [(PRV) Argentina] Ushuaia Bay
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00401951_v476_n3-4_p436_Peroni
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_00401951_v476_n3-4_p436_Peroni2023-10-03T14:50:14Z Geophysical modeling and structure of Ushuaia Pluton, Fuegian Andes, Argentina Peroni, J.I. Tassone, A.A. Menichetti, M. Cerredo, M.E. Magnetic modeling Pluton emplacement Strike-slip activity Tierra del Fuego Aeromagnetic data Argentina Cenomanian Central zone Fault system Geophysical modeling Geophysical models Late cretaceous Lower Cretaceous Magnetic modeling Modeling results New model Normal faults Pluton emplacement South America Strike-slip activity Tierra del Fuego Geophysics Sedimentology Structural geology Sedimentary rocks Albian Cenomanian continental margin deformation emplacement extensional tectonics magnetic method normal fault pluton potassium-argon dating rock microstructure strike-slip fault Argentina South America Tierra del Fuego [(PRV) Argentina] Ushuaia Bay Within the area of Ushuaia Bay (Tierra del Fuego, southernmost South America) the deformed Lower Cretaceous sedimentary rocks of Yahgán Formation host the Ushuaia Pluton. The intrusive body is oval in map view; it is compositionally varied with rocks ranging from the ultrabasic to the mesosiliceous realm. The emplacement time is constrained within the Albian-Cenomanian span by new amphibole K/Ar data. Meso- and microstructures of Ushuaia Pluton and its host indicate a synkinematic emplacement with a dominant extensional component. A set of transcurrent and normal faults related to the sinistral strike-slip Beagle Channel Fault System affects the pluton and its host. On the basis of aeromagnetic data combined with field information, a new model is presented for the Ushuaia Pluton. Modeling results fit well with a laccolithic body with an estimated volume of around 111 km3. The model pluton cross-section displays a central zone with an average thickness of 2000 m which progressively thins toward the margins (∼ 500 m) and a southern root which reaches 5000 m deep. The combined structural and geophysical model supports a transtensive scenario for the Ushuaia Pluton emplacement at Early-Late Cretaceous boundary. © 2009 Elsevier B.V. All rights reserved. Fil:Peroni, J.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tassone, A.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cerredo, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00401951_v476_n3-4_p436_Peroni
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Magnetic modeling Pluton emplacement Strike-slip activity Tierra del Fuego Aeromagnetic data Argentina Cenomanian Central zone Fault system Geophysical modeling Geophysical models Late cretaceous Lower Cretaceous Magnetic modeling Modeling results New model Normal faults Pluton emplacement South America Strike-slip activity Tierra del Fuego Geophysics Sedimentology Structural geology Sedimentary rocks Albian Cenomanian continental margin deformation emplacement extensional tectonics magnetic method normal fault pluton potassium-argon dating rock microstructure strike-slip fault Argentina South America Tierra del Fuego [(PRV) Argentina] Ushuaia Bay
spellingShingle	Magnetic modeling Pluton emplacement Strike-slip activity Tierra del Fuego Aeromagnetic data Argentina Cenomanian Central zone Fault system Geophysical modeling Geophysical models Late cretaceous Lower Cretaceous Magnetic modeling Modeling results New model Normal faults Pluton emplacement South America Strike-slip activity Tierra del Fuego Geophysics Sedimentology Structural geology Sedimentary rocks Albian Cenomanian continental margin deformation emplacement extensional tectonics magnetic method normal fault pluton potassium-argon dating rock microstructure strike-slip fault Argentina South America Tierra del Fuego [(PRV) Argentina] Ushuaia Bay Peroni, J.I. Tassone, A.A. Menichetti, M. Cerredo, M.E. Geophysical modeling and structure of Ushuaia Pluton, Fuegian Andes, Argentina
topic_facet	Magnetic modeling Pluton emplacement Strike-slip activity Tierra del Fuego Aeromagnetic data Argentina Cenomanian Central zone Fault system Geophysical modeling Geophysical models Late cretaceous Lower Cretaceous Magnetic modeling Modeling results New model Normal faults Pluton emplacement South America Strike-slip activity Tierra del Fuego Geophysics Sedimentology Structural geology Sedimentary rocks Albian Cenomanian continental margin deformation emplacement extensional tectonics magnetic method normal fault pluton potassium-argon dating rock microstructure strike-slip fault Argentina South America Tierra del Fuego [(PRV) Argentina] Ushuaia Bay
description	Within the area of Ushuaia Bay (Tierra del Fuego, southernmost South America) the deformed Lower Cretaceous sedimentary rocks of Yahgán Formation host the Ushuaia Pluton. The intrusive body is oval in map view; it is compositionally varied with rocks ranging from the ultrabasic to the mesosiliceous realm. The emplacement time is constrained within the Albian-Cenomanian span by new amphibole K/Ar data. Meso- and microstructures of Ushuaia Pluton and its host indicate a synkinematic emplacement with a dominant extensional component. A set of transcurrent and normal faults related to the sinistral strike-slip Beagle Channel Fault System affects the pluton and its host. On the basis of aeromagnetic data combined with field information, a new model is presented for the Ushuaia Pluton. Modeling results fit well with a laccolithic body with an estimated volume of around 111 km3. The model pluton cross-section displays a central zone with an average thickness of 2000 m which progressively thins toward the margins (∼ 500 m) and a southern root which reaches 5000 m deep. The combined structural and geophysical model supports a transtensive scenario for the Ushuaia Pluton emplacement at Early-Late Cretaceous boundary. © 2009 Elsevier B.V. All rights reserved.
format	JOUR
author	Peroni, J.I. Tassone, A.A. Menichetti, M. Cerredo, M.E.
author_facet	Peroni, J.I. Tassone, A.A. Menichetti, M. Cerredo, M.E.
author_sort	Peroni, J.I.
title	Geophysical modeling and structure of Ushuaia Pluton, Fuegian Andes, Argentina
title_short	Geophysical modeling and structure of Ushuaia Pluton, Fuegian Andes, Argentina
title_full	Geophysical modeling and structure of Ushuaia Pluton, Fuegian Andes, Argentina
title_fullStr	Geophysical modeling and structure of Ushuaia Pluton, Fuegian Andes, Argentina
title_full_unstemmed	Geophysical modeling and structure of Ushuaia Pluton, Fuegian Andes, Argentina
title_sort	geophysical modeling and structure of ushuaia pluton, fuegian andes, argentina
url	http://hdl.handle.net/20.500.12110/paper_00401951_v476_n3-4_p436_Peroni
work_keys_str_mv	AT peroniji geophysicalmodelingandstructureofushuaiaplutonfuegianandesargentina AT tassoneaa geophysicalmodelingandstructureofushuaiaplutonfuegianandesargentina AT menichettim geophysicalmodelingandstructureofushuaiaplutonfuegianandesargentina AT cerredome geophysicalmodelingandstructureofushuaiaplutonfuegianandesargentina
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Geophysical modeling and structure of Ushuaia Pluton, Fuegian Andes, Argentina

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