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Andean geology

versión On-line ISSN 0718-7106

Resumen

WATT, Sebastian F.L; PYLE, David M  y  MATHER, Tamsin A. Geology, petrology and geochemistry of the dome complex of Huequi volcano, southern Chile. AndGeo [online]. 2011, vol.38, n.2, pp.335-348. ISSN 0718-7106.

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.

Palabras clave : Huequi volcano; Andean southern volcanic zone; Andesite; Amphibole; Lava dome.

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