A càrrec del Prof. Mary R. Reid, Department of Geology, Northern Arizona University (EUA)
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 13 de Maig
Hora: 12.00 h
Lloc: sala d'actes de l'Institut Jaume Almera

Resum:
A long-recognized correlation between the volume of major eruptions and the time interval between them suggests that magma may accumulate for about a million years before a supereruption. However, radiometric ages show that the duration of supervolcano magma accumulation could be significantly shorter than this. Even so crystals in supervolcano magmas may have protracted growth histories and may grow from chemically different hosts as crystallization progresses. This talk will illustrate how these conclusions have been reached using insights gained from the products of two supereruptions - the Bishop Tuff of Long Valley caldera, California, and the Youngest Toba Tuff in Indonesia.