Middle Miocene peralkaline ignimbrites in the Hermosillo region (Sonora, Mexico): Geodynamic implications |
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| Authors: | Jesús Vidal Solano Francisco A Paz Moreno Alexander Iriondo Alain Demant Jean-Jacques Cochem |
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| Institution: | aDepartamento de Geología, Universidad de Sonora, Apdo. Postal 847, 83000 Hermosillo, Sonora, México;b« Pétrologie magmatique », université Paul-Cézanne, case courier 441, 13397 Marseille cedex 20, France;cCentro de Geociencias, UNAM, Campus Juriquilla, C.P. 76230 Juriquilla, Querétaro, México;dDepartment of Geological Sciences, University of Colorado at Boulder, Boulder, CO 80309, USA |
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| Abstract: | Scattered ignimbritic mesas crop out in the Hermosillo region (Sonora, Mexico). These rocks that have been dated at 12.5 Ma (Middle Miocene) have the petrography and chemical characteristics of comendites. Such a flare-up of peralkaline acidic volcanism, after a long period of subduction-related arc volcanism, emphasises an important change in the source of volcanism. It corresponds to the latest stage of continental extension prior to the marine invasion and the development of spreading centres in the Gulf of California. To cite this article: J. Vidal Solano et al., C. R. Geoscience 337 (2005). |
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| Keywords: | Volcanism Mexico Petrology Geochronology Geochemistry Gulf of CaliforniaMots-clé s: Volcanisme Mexique Pé trologie Gé ochronologie Gé ochimie Golfe de Californie |
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