Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego

Age estimates for the onset of a seaway through the Drake Passage range from middle Eocene to early Miocene, complicating interpretations of the relation between ocean circulation and Cenozoic global cooling. Here we present evidence for the presence of a latest Paleocene-early Eocene extensional ba...

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Autores principales: Ghiglione, M.C., Yagupsky, D., Ghidella, M., Ramos, V.A.
Formato: JOUR
Materias:
Airborne magnetic data
Continental stretching
Scotia Sea
Tierra del Fuego
Drake passage
Concentration (process)
Isomers
Oceanography
Structural geology
basin evolution
Cenozoic
Eocene
extensional tectonics
faulting
lithospheric structure
Miocene
oceanic circulation
Paleocene
Atlantic Ocean
Drake Passage
South America
Tierra del Fuego [(ARC) South America]
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00917613_v36_n8_p643_Ghiglione
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00917613_v36_n8_p643_Ghiglione
record_format dspace
spelling todo:paper_00917613_v36_n8_p643_Ghiglione2023-10-03T14:55:06Z Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego Ghiglione, M.C. Yagupsky, D. Ghidella, M. Ramos, V.A. Airborne magnetic data Continental stretching Scotia Sea Tierra del Fuego Airborne magnetic data Continental stretching Drake passage Scotia Sea Tierra del Fuego Concentration (process) Isomers Oceanography Structural geology basin evolution Cenozoic Eocene extensional tectonics faulting lithospheric structure Miocene oceanic circulation Paleocene Atlantic Ocean Drake Passage Scotia Sea South America Tierra del Fuego [(ARC) South America] Age estimates for the onset of a seaway through the Drake Passage range from middle Eocene to early Miocene, complicating interpretations of the relation between ocean circulation and Cenozoic global cooling. Here we present evidence for the presence of a latest Paleocene-early Eocene extensional basin (i.e., lateral rift) in Tierra del Fuego. An accurately dated postrift unconformity indicates that extensional faulting ended in the studied area ca. 49 Ma, in concurrence with a previously reported eightfold increase in South America-Antarctica separation rate, and the proposed onset of oceanic basins in the incipient Drake Passage. The coincidence of these facts indicates progressive strain concentration on the zone of future crustal separation (i.e., Drake Passage) after abandonment of lateral rifts ca. 49 Ma. Although the described extensional depocenters did not allow the exchange of water between the Pacific and Atlantic Oceans, they represent a direct indication of continental lithospheric stretching preceding the recently proposed Eocene opening of embryonic basins in the West Scotia Sea. © 2008 The Geological Society of America. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00917613_v36_n8_p643_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 Airborne magnetic data
Continental stretching
Scotia Sea
Tierra del Fuego
Airborne magnetic data
Continental stretching
Drake passage
Scotia Sea
Tierra del Fuego
Concentration (process)
Isomers
Oceanography
Structural geology
basin evolution
Cenozoic
Eocene
extensional tectonics
faulting
lithospheric structure
Miocene
oceanic circulation
Paleocene
Atlantic Ocean
Drake Passage
Scotia Sea
South America
Tierra del Fuego [(ARC) South America]
spellingShingle Airborne magnetic data
Continental stretching
Scotia Sea
Tierra del Fuego
Airborne magnetic data
Continental stretching
Drake passage
Scotia Sea
Tierra del Fuego
Concentration (process)
Isomers
Oceanography
Structural geology
basin evolution
Cenozoic
Eocene
extensional tectonics
faulting
lithospheric structure
Miocene
oceanic circulation
Paleocene
Atlantic Ocean
Drake Passage
Scotia Sea
South America
Tierra del Fuego [(ARC) South America]
Ghiglione, M.C.
Yagupsky, D.
Ghidella, M.
Ramos, V.A.
Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego
topic_facet Airborne magnetic data
Continental stretching
Scotia Sea
Tierra del Fuego
Airborne magnetic data
Continental stretching
Drake passage
Scotia Sea
Tierra del Fuego
Concentration (process)
Isomers
Oceanography
Structural geology
basin evolution
Cenozoic
Eocene
extensional tectonics
faulting
lithospheric structure
Miocene
oceanic circulation
Paleocene
Atlantic Ocean
Drake Passage
Scotia Sea
South America
Tierra del Fuego [(ARC) South America]
description Age estimates for the onset of a seaway through the Drake Passage range from middle Eocene to early Miocene, complicating interpretations of the relation between ocean circulation and Cenozoic global cooling. Here we present evidence for the presence of a latest Paleocene-early Eocene extensional basin (i.e., lateral rift) in Tierra del Fuego. An accurately dated postrift unconformity indicates that extensional faulting ended in the studied area ca. 49 Ma, in concurrence with a previously reported eightfold increase in South America-Antarctica separation rate, and the proposed onset of oceanic basins in the incipient Drake Passage. The coincidence of these facts indicates progressive strain concentration on the zone of future crustal separation (i.e., Drake Passage) after abandonment of lateral rifts ca. 49 Ma. Although the described extensional depocenters did not allow the exchange of water between the Pacific and Atlantic Oceans, they represent a direct indication of continental lithospheric stretching preceding the recently proposed Eocene opening of embryonic basins in the West Scotia Sea. © 2008 The Geological Society of America.
format JOUR
author Ghiglione, M.C.
Yagupsky, D.
Ghidella, M.
Ramos, V.A.
author_facet Ghiglione, M.C.
Yagupsky, D.
Ghidella, M.
Ramos, V.A.
author_sort Ghiglione, M.C.
title Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego
title_short Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego
title_full Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego
title_fullStr Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego
title_full_unstemmed Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego
title_sort continental stretching preceding the opening of the drake passage: evidence from tierra del fuego
url http://hdl.handle.net/20.500.12110/paper_00917613_v36_n8_p643_Ghiglione
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AT yagupskyd continentalstretchingprecedingtheopeningofthedrakepassageevidencefromtierradelfuego
AT ghidellam continentalstretchingprecedingtheopeningofthedrakepassageevidencefromtierradelfuego
AT ramosva continentalstretchingprecedingtheopeningofthedrakepassageevidencefromtierradelfuego
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