Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/29195
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Título : Autopsy on a dead spreading center: The Phoenix Ridge, Drake Passage, Antarctica
Autor : 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.
Palabras clave : Drake passage
Phoenix ridge
Antarctic plate
Spreading centers
Fecha de publicación : Jul-2000
Editor: Geological Society of America
Citación : Geology 28(7): 607-610 (2000)
Resumen: 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.
Descripción : 4 páginas, 4 figuras.
Versión del editor: http://dx.doi.org/10.1130/0091-7613(2000)28<607:AOADSC>2.0.CO;2
URI : http://hdl.handle.net/10261/29195
ISSN: 0091-7613
DOI: 10.1130/0091-7613(2000)28<607:AOADSC>2.0.CO;2
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