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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Publicado:	2008
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:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00917613_v36_n8_p643_Ghiglione 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	paper:paper_00917613_v36_n8_p643_Ghiglione
record_format	dspace
spelling	paper:paper_00917613_v36_n8_p643_Ghiglione2023-06-08T15:08:11Z Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego 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. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00917613_v36_n8_p643_Ghiglione 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] 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.
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
publishDate	2008
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00917613_v36_n8_p643_Ghiglione http://hdl.handle.net/20.500.12110/paper_00917613_v36_n8_p643_Ghiglione
_version_	1768542829310640128

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

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