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      Geology, petrology and geochemistry of the dome complex of Huequi volcano, southern Chile Translated title: Geología, petrología y geoquímica de los domos volcánicos del volcán Huequi, Chile meridional

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          Abstract

          Huequi, a little-known volcano in the southern part of the Andean southern volcanic zone (SSVZ), shows a regionally unusual eruption style, mineralogy and geochemistry. The volcano comprises multiple highly-eroded lava domes. Past eruptions were accompanied by relatively minor explosive activity, most recently from 1890-1920. The rocks erupted by Huequi range from basaltic andesite to dacite, and are highly distinctive when compared to other volcanoes of the SSVZ, being K-poor and Al-rich, and containing euhedral hornblende phenocrysts. Overall compositions suggest a notably water-rich magma source, evolving through high levels of fractionation and subsequent degassing to produce highly porphyritic dome-forming andesites. The ultimate causes of water-rich magmas at this point in the arc remain unclear.

          Translated abstract

          El volcán Huequi es poco conocido, que se ubica en la provincia sur de la zona Volcánica Sur de los Andes (ZVSS). Sus tipos de erupción y características mineralógicas y geoquímicas son poco comunes a nivel regional. El volcán presenta múltiples domos poco erosionados. Las erupciones estuvieron acompañadas por una actividad explosiva secundaria, siendo las más recientes las ocurridas entre los años 1890 y 1920. Los magmas del Huequi son de composición andesítico-basáltica a dacítica. Si se las compara con rocas eruptadas por otros centros volcánicos de la ZVSS de los Andes, las del Huequi se caracterizan por ser pobres en K, ricas en Al y por presentar fenocristales euhedrales de anfíbola. Las composiciones totales sugieren una fuente magmática rica en H2O, que se desarrolla a través de niveles de cristalización fraccionada y desgasificación subsecuente, que producen domos volcánicos andesíticos altamente porfíricos. Sin embargo, la causa última que genera magmas ricos en H2O, en esta parte de los Andes, sigue aún sin explicación.

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          Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes

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            A Guide to the Chemical Classification of the Common Volcanic Rocks

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              Crustal contributions to arc magmatism in the Andes of Central Chile

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                Author and article information

                Journal
                andgeol
                Andean geology
                AndGeo
                Servicio Nacional de Geología y Minería (SERNAGEOMIN) (Santiago, , Chile )
                0718-7106
                July 2011
                : 38
                : 2
                : 335-348
                Affiliations
                [02] orgnameUniversity of Southampton orgdiv1National Oceanography Centre, Southampton orgdiv2School of Ocean and Earth Science U.K
                [01] Oxford orgnameUniversity of Oxford orgdiv1Department of Earth Sciences U.K. Tamsin.Mather@ 123456earth.ox.ac.uk
                Article
                S0718-71062011000200005 S0718-7106(11)03800205
                e2e02196-72ae-44fa-b369-4e08e99659f2

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 21 February 2011
                : 28 September 2010
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 25, Pages: 14
                Product

                SciELO Chile


                Domo volcánico,Anfíbola,Andesita,Zona Volcánica Sur de los Andes,Volcán Huequi,Lava dome,Amphibole,Andesite,Andean southern volcanic zone,Huequi volcano

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