Transition from calc-alkalic to adakitic magmatism at Cayambe volcano, Ecuador: Insights into slab melts and mantle wedge interactions

Abstract

Research Article| November 01, 2002 Transition from calc-alkalic to adakitic magmatism at Cayambe volcano, Ecuador: Insights into slab melts and mantle wedge interactions Pablo Samaniego; Pablo Samaniego 1Departamento de Geofísica, Escuela Politécnica Nacional, Ap. 17-01-2759, Quito, Ecuador, and Laboratoire Magmas et Volcans, Université Blaise Pascal and Institut de Recherche pour le Développement, 5 rue Kessler, 63038 Clermont-Ferrand, France Search for other works by this author on: GSW Google Scholar Hervé Martin; Hervé Martin 2Laboratoire Magmas et Volcans, Observatoire de Physique du Globe de Clermont-Ferrand, Université Blaise Pascal, Center National de la Recherche Scientifique, 5 rue Kessler, 63038 Clermont-Ferrand, France Search for other works by this author on: GSW Google Scholar Claude Robin; Claude Robin 3Institut de Recherche pour le Développement, Laboratoire Magmas et Volcans, Université Blaise Pascal, 5 rue Kessler, 63038 Clermont-Ferrand, France Search for other works by this author on: GSW Google Scholar Michel Monzier Michel Monzier 3Institut de Recherche pour le Développement, Laboratoire Magmas et Volcans, Université Blaise Pascal, 5 rue Kessler, 63038 Clermont-Ferrand, France Search for other works by this author on: GSW Google Scholar Geology (2002) 30 (11): 967–970. https://doi.org/10.1130/0091-7613(2002)030<0967:TFCATA>2.0.CO;2 Article history received: 07 Mar 2002 rev-recd: 11 Jul 2002 accepted: 13 Jul 2002 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Pablo Samaniego, Hervé Martin, Claude Robin, Michel Monzier; Transition from calc-alkalic to adakitic magmatism at Cayambe volcano, Ecuador: Insights into slab melts and mantle wedge interactions. Geology 2002;; 30 (11): 967–970. doi: https://doi.org/10.1130/0091-7613(2002)030<0967:TFCATA>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract In volcanic arcs, two main types of magmatism are recognized: (1) widespread calc-alkalic magmatism, generated by hydrous partial melting of a metasomatized mantle wedge, and (2) less common adakitic volcanism produced by subducted-slab melting. The Cayambe volcanic complex in Ecuador shows a progressive temporal change from an older calc-alkalic volcano (Viejo Cayambe) to a younger adakitic edifice (Nevado Cayambe). This evolution may be related to the unusual geodynamic setting of the Ecuadorian Andes, controlled mainly by the subduction of the Nazca plate, including the Carnegie Ridge thickened oceanic crust. The Viejo Cayambe magmas appear to be generated from a mantle-wedge source, slightly metasomatized by slab-derived melts. Conversely, the Nevado Cayambe magmas imply either stronger and more advanced interactions between slab melts and mantle peridotite, or that adakitic magma could reach the surface due to higher degrees of slab melting. Fractional crystallization, assimilation, and mixing processes also contributed to lava diversity. We propose that the magmatic evolution of the Cayambe volcanic complex is due to increasing efficiency of interaction between slab melts and the mantle wedge, because of higher degrees of slab melting in response to the subduction of the Carnegie Ridge. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.