a càrrec de Michael Dungan, Section des Sciences de la Terre, Université de Genève, Suïssa
SEMINARIS DE LA FACULTAT DE GEOLOGIA I L'INSTITUT DE CIÈNCIES DE LA TERRA "JAUME ALMERA"

Universitat de Barcelona (UB)
Consell Superior d'Investigacions Científiques (CSIC)

Dia: Dimecres 14 de maig
Hora: 12:00h.
Lloc: Sala d'actes de l'Institut "Jaume Almera"

Resum: Holocene Volcán Llaima, one of Chile's historically most active volcanoes, is broadly typical of Holocene frontal arc centers of the Andean Southern Volcanic Zone (SVZ) that lie between the latitudes of 38.4° S (Lonquimay) and 41° S (Osorno). It is dominated volumetrically by evolved basaltic and basaltic andesitic magmas (<6.5 wt% MgO; 51-54 wt% SiO2), and magma evolution is primarily by fractional crystallization without large contributions from assimilated upper crust. In this presentation I will (1) place constraints on the relationships among magma evolution, conduit geometry and location, and eruptive behavior, (2) use these data and insights to address questions about the nature of the asthenospheric mantle and magma generation processes beneath Llaima, and (3) enhance the value of regional-scale, along-arc assessments of magma genesis and evolution by creating a 'reference volcano' data-set for calibration of trends that ar
e defined in large part by reconnaissance