Middle Miocene peralkaline ignimbrites in the Hermosillo region (Sonora, Mexico): Geodynamic implications
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- 作者：Jesú ; s Vidal Solano ; Francisco A. Paz Moreno ; Alexander Iriondo ; Alain Demant and Jean-Jacques Cochemé
- 关键词：Volcanism ; Mexico ; Petrology ; Geochronology ; Geochemistry ; Gulf of California
Mots-clé ; s ; Volcanisme ; Mexique ; Pé ; trologie ; Gé ; ochronologie ; Gé ; ochimie ; Golfe de Californie - 刊名：Comptes Rendus Geoscience
- 出版年：2005
- 出版时间：December 2005
- 年：2005
- 卷：337
- 期：16
- 页码：1421-1430
- 全文大小：2962 K
文摘
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).