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

AuthorsLivermore, 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.
KeywordsDrake passage
Phoenix ridge
Antarctic plate
Spreading centers
Issue DateJul-2000
PublisherGeological Society of America
CitationGeology 28(7): 607-610 (2000)
AbstractNew 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.
Description4 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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