Slab-Tearing Following Ridge-Trench Collision: Evidence from Miocene Volcanism in Baja California, México ⁎ Carlos Pallares A, , René C
Journal of Volcanology and Geothermal Research 161 (2007) 95–117 www.elsevier.com/locate/jvolgeores Slab-tearing following ridge-trench collision: Evidence from Miocene volcanism in Baja California, México ⁎ Carlos Pallares a, , René C. Maury a, Hervé Bellon b, Jean-Yves Royer a, Thierry Calmus c, Alfredo Aguillón-Robles d, Joseph Cotten b, Mathieu Benoit a, François Michaud e, Jacques Bourgois f a UMR 6538, Domaines Océaniques, IUEM, Université de Bretagne Occidentale, Place Nicolas Copernic, F-29280 Plouzané, France b UMR 6538, Domaines Océaniques, IUEM, Université de Bretagne Occidentale, 6, Av. Le Gorgeu, C.S. 93837, F-29238 Brest Cedex 3, France c Estación Regional del Noroeste, Instituto de Geología, UNAM, Hermosillo, Son., C.P. 83000, México d Instituto de Geología, UASLP, Av. Dr. Manuel Nava no. 5, Zona Universitaria, San Luis Potosí, S.L.P., C.P. 78250, México e UMR 6526, Géosciences Azur, Université Pierre et Marie Curie, F-06235 Villefranche sur Mer, France f IRD and CNRS, UMR 6526, Escuela Politecnica Nacional (EPN), Departamento de Geología y Riesgos Naturales (DGRN), Andalucia n/s, P.O. Box 17-01-2759, Quito, Ecuador Received 15 June 2006; received in revised form 3 November 2006; accepted 12 November 2006 Available online 5 January 2007 Abstract Neogene magmatic activity in Central Baja California underwent a major change at ca. 12.5 Ma, when the Pacific–Farallon active oceanic ridge collided with the trench east of Vizcaíno Peninsula. The calc-alkaline magmatism which built the Comondú volcanic arc vanished and was replaced by unusual volcanic associations, which were erupted within six Late Miocene to Quaternary volcanic fields (Jaraguay, San Borja, San Ignacio, Santa Rosalía, Santa Clara, La Purísima), delineating a 600 km array along the Baja California Peninsula.
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