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

Authors:Livermore, Roy
Balanyá, Juan Carlos
Maldonado, Andrés
Martínez-Martínez, José Miguel
Rodríguez-Fernández, José
Sanz de Galdeano, Carlos
Galindo-Zaldívar, Jesús
Jabaloy, Antonio
Barnolas, Antonio
Somoza, Luis
Hernández-Molina, Francisco J.
Suriñach, Emma
Viseras, C.
Keywords:Drake passage, Phoenix ridge, Antarctic plate, Spreading centers
Issue Date:Jul-2000
Publisher:Geological Society of America
Citation:Geology 28(7): 607-610 (2000)
Abstract: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.
Description:4 páginas, 4 figuras.
Publisher version (URL):http://dx.doi.org/10.1130/0091-7613(2000)28<607:AOADSC>2.0.CO;2
Appears in Collections:(IACT) Artículos

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