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

2008; Geological Society of America; Volume: 36; Issue: 8 Linguagem: Inglês

10.1130/g24857a.1

1943-2682

Matías C. Ghiglione, Daniel Yagupsky, Marta E. Ghidella, Víctor A. Ramos,

Geological formations and processes

Research Article| August 01, 2008 Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego Matías C. Ghiglione; Matías C. Ghiglione * 1Laboratorio de Tectónica Andina, Universidad de Buenos Aires, Buenos Aires, C1428EHA, Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) *E-mail: matias@gl.fcen.uba.ar. Search for other works by this author on: GSW Google Scholar Daniel Yagupsky; Daniel Yagupsky 2Laboratorio de Modelado Geológico (LaMoGe), Universidad de Buenos Aires, Buenos Aires, C1428EHA, Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Search for other works by this author on: GSW Google Scholar Marta Ghidella; Marta Ghidella 3Instituto Antártico Argentino, Cerrito 1248, Buenos Aires, C1010AAZ, Argentina Search for other works by this author on: GSW Google Scholar Victor A. Ramos Victor A. Ramos 1Laboratorio de Tectónica Andina, Universidad de Buenos Aires, Buenos Aires, C1428EHA, Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Search for other works by this author on: GSW Google Scholar Author and Article Information Matías C. Ghiglione * 1Laboratorio de Tectónica Andina, Universidad de Buenos Aires, Buenos Aires, C1428EHA, Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Daniel Yagupsky 2Laboratorio de Modelado Geológico (LaMoGe), Universidad de Buenos Aires, Buenos Aires, C1428EHA, Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Marta Ghidella 3Instituto Antártico Argentino, Cerrito 1248, Buenos Aires, C1010AAZ, Argentina Victor A. Ramos 1Laboratorio de Tectónica Andina, Universidad de Buenos Aires, Buenos Aires, C1428EHA, Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) *E-mail: matias@gl.fcen.uba.ar. Publisher: Geological Society of America Received: 28 Feb 2008 Revision Received: 30 Apr 2008 Accepted: 04 May 2008 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2008 Geological Society of America Geology (2008) 36 (8): 643–646. https://doi.org/10.1130/G24857A.1 Article history Received: 28 Feb 2008 Revision Received: 30 Apr 2008 Accepted: 04 May 2008 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Matías C. Ghiglione, Daniel Yagupsky, Marta Ghidella, Victor A. Ramos; Continental stretching preceding the opening of the Drake Passage: Evidence from Tierra del Fuego. Geology 2008;; 36 (8): 643–646. doi: https://doi.org/10.1130/G24857A.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search 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. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.