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Did the East Pacific rise subduct beneath the North America plate (western Mexico)? |
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| Authors: | F Michaud J Dañobeitia R Bartolomé R Carbonell L Delgado Argote D Cordoba T Monfret |
| Institution: | Géosciences Azur, Université Pierre et Marie-Curie, Quai de La Darse, BP 48, 06235 Villefranche-sur-Mer cedex, France, Instituto de Ciencias de la Tierra, Consejo Superior de Investigaciones Cientificas, Lluis Sole i Sabaris, 08028 Barcelona, Spain, Departamento de Geologia, Centro de Investigacion Cientifica y Educacion Superior de Ensenada, Ensenada, Baja California 22830, Mexico, Universidad Complutense de Madrid, Departamento Geofisica, Avenida Complutense s/n, 28040 Madrid, Spain, IRD, Géosciences Azur, Université de Nice-Sophia Antipolis, 250 Avenue Albert Einstein, 06560 Valbonne, France, |
| Abstract: | New data collected between the northernmost tip of the East Pacific rise (18°05'N, 105°35'W) and the Middle America trench provide evidence that the seafloor, which lacks significant sedimentary cover, has a typical spreading-derived abyssal hill topography. The tectonic fabric of this seafloor is concave to the west, as it is today at the tip of the East Pacific rise. Farther to the east, at the outer wall of the trench, the seafloor topography exhibits a north-south trending fabric. We suggest that this fabric originated along the East Pacific rise, as it reached the trench and possibly subducted beneath the North America plate prior to the development of the complex connection of the East Pacific rise with the Rivera transform. |
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