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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 CSIC ORCID; Martínez-Martínez, José Miguel; Rodríguez-Fernández, José; Sanz de Galdeano, Carlos CSIC ORCID; Galindo-Zaldívar, Jesús; Jabaloy, Antonio; Barnolas Cortina, Antonio; Somoza, Luis CSIC ORCID ; 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 | DOI: | 10.1130/0091-7613(2000)28<607:AOADSC>2.0.CO;2 | ISSN: | 0091-7613 |
Aparece en las colecciones: | (IACT) Artículos (IGME) Artículos |
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