Structure of the Malpelo Ridge (Colombia) from seismic and gravity modelling
| Autor: | Jean-Yves Collot, Philippe Charvis, Boris Marcaillou |
|---|---|
| Přispěvatelé: | Géoazur (GEOAZUR 6526), Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
geography
geography.geographical_feature_category Rift 010504 meteorology & atmospheric sciences Malpelo Ridge wide angle seismic Fracture zone Mid-ocean ridge Crust 010502 geochemistry & geophysics Oceanography 01 natural sciences Tectonics Geophysics Ridge push Geochemistry and Petrology Hotspot (geology) multichanel seismic Oceanic basin Galapagos hot spot Seismology Geology 0105 earth and related environmental sciences Cocos Nazca Spreading Centre |
| Zdroj: | Marine Geophysical Research Marine Geophysical Research, 2006, 27 (4), pp.289-300. ⟨10.1007/s11001-006-9009-y⟩ Marine Geophysical Research, Springer Verlag, 2006, 27 (4), pp.289-300. ⟨10.1007/s11001-006-9009-y⟩ |
| ISSN: | 0025-3235 1573-0581 |
| Popis: | Wide-angle and multichannel seismic data collected on the Malpelo Ridge provide an image of the deep structure of the ridge and new insights on its emplacement and tectonic history. The crustal structure of the Malpelo Ridge shows a 14 km thick asymmetric crustal root with a smooth transition to the oceanic basin southeastward, whereas the transition is abrupt beneath its northwestern flank. Crustal thickening is mainly related to the thickening of the lower crust, which exhibits velocities from 6.5 to 7.4 km/s. The deep structure is consistent with emplacement at an active spreading axis under a hotspot like the present-day Galapagos Hotspot on the Cocos-Nazca Spreading Centre. Our results favour the hypothesis that the Malpelo Ridge was formerly a continuation of the Cocos Ridge, emplaced simultaneously with the Carnegie Ridge at the Cocos-Nazca Spreading Centre, from which it was separated and subsequently drifted southward relative to the Cocos Ridge due to differential motion along the dextral strike-slip Panama Fracture Zone. The steep faulted northern flank of the Malpelo Ridge and the counterpart steep and faulted southern flank of Regina Ridge are possibly related to a rifting phase that resulted in the Coiba Microplate’s separation from the Nazca Plate along the Sandra Rift. |
| Databáze: | OpenAIRE |
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