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Abstract:

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.

Registro:

Documento: Artículo
Título:Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego
Autor:Ghiglione, M.C.; Yagupsky, D.; Ghidella, M.; Ramos, V.A.
Filiación:Laboratorio de Tectónica Andina, Universidad de Buenos Aires, Buenos Aires C1428EHA, Argentina
Laboratorio de Modelado Geológico (LaMoGe), Universidad de Buenos Aires, Buenos Aires C1428EHA, Argentina
Instituto Antártico Argentino, Cerrito 1248, Buenos Aires C1010AAZ, Argentina
Consejo Nacional de Investigaciones Científi cas y Técnicas (CONICET)
Palabras clave: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]
Año:2008
Volumen:36
Número:8
Página de inicio:643
Página de fin:646
DOI: http://dx.doi.org/10.1130/G24857A.1
Título revista:Geology
Título revista abreviado:Geology
ISSN:00917613
CODEN:GLGYB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00917613_v36_n8_p643_Ghiglione

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Citas:

---------- APA ----------
Ghiglione, M.C., Yagupsky, D., Ghidella, M. & Ramos, V.A. (2008) . Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego. Geology, 36(8), 643-646.
http://dx.doi.org/10.1130/G24857A.1
---------- CHICAGO ----------
Ghiglione, M.C., Yagupsky, D., Ghidella, M., Ramos, V.A. "Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego" . Geology 36, no. 8 (2008) : 643-646.
http://dx.doi.org/10.1130/G24857A.1
---------- MLA ----------
Ghiglione, M.C., Yagupsky, D., Ghidella, M., Ramos, V.A. "Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego" . Geology, vol. 36, no. 8, 2008, pp. 643-646.
http://dx.doi.org/10.1130/G24857A.1
---------- VANCOUVER ----------
Ghiglione, M.C., Yagupsky, D., Ghidella, M., Ramos, V.A. Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego. Geology. 2008;36(8):643-646.
http://dx.doi.org/10.1130/G24857A.1