Autopsy on a dead spreading center: The Phoenix Ridge, Drake Passage, Antarctica

Livermore, Roy; Balanyá, Juan Carlos; Maldonado, Andrés; Martínez, José Miguel; Rodríguez-Fernández, José; Sanz de Galdeano, Carlos; Zaldívar, Jesús Galindo; Jabaloy, Antonio; Barnolas, Antonio; Somoza, Luis; Hernández-Molina, Javier; Suriñach, Emma; Viseras, César. 2000 Autopsy on a dead spreading center: The Phoenix Ridge, Drake Passage, Antarctica. Geology, 28 (7). 607-610.<607:AOADSC>2.0.CO;2

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New bathymetric and magnetic anomaly data from the Phoenix Ridge, Antarctica, show that extinction of all three remaining segments occurred at the time of magnetic chron C2A (3.3 ± 0.2 Ma), synchronous with a ridge-trench collision south of the Hero Fracture Zone. This implies that the ultimate cause of extinction was a change in plate boundary forces occasioned by this collision. Spreading rates slowed abruptly at the time of chron C4 (7.8 ± 0.3 Ma), probably as a result of extinction of the West Scotia Ridge, which would have led to an increase in slip rate and transpressional stress across the Shackleton Fracture Zone. Spectacular, high-relief ridges flanking the extinct spreading center, mapped for the first time using multibeam swath bathymetry, are interpreted as a consequence of a reduction in spreading rate, involving a temporary magma oversupply immediately prior to extinction.

Item Type: Publication - Article
Digital Object Identifier (DOI):<607:AOADSC>2.0.CO;2
Programmes: BAS Programmes > Pre 2000 programme
ISSN: 0091-7613
Additional Keywords: Drake Passage, Phoenix, Antarctic plate, spreading centers
Date made live: 29 Nov 2012 09:36 +0 (UTC)

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