Rapid cooling and cold storage in a silicic magma reservoir recorded in individual crystals

TitleRapid cooling and cold storage in a silicic magma reservoir recorded in individual crystals
Publication TypeJournal Article
Year of Publication2107
AuthorsTill AER, Cooper KM, Till CB, Kent AJR, Costa F, Bose M, Gravley D, Deering C, Cole J
JournalScience
Volume356
Issue6343
Pagination1154-1156
Date Published06/2017
Abstract

Silicic volcanic eruptions pose considerable hazards, yet the processes leading to these eruptions remain poorly known. A missing link is knowledge of the thermal history of magma feeding such eruptions, which largely controls crystallinity and therefore eruptability. We have determined the thermal history of individual zircon crystals from an eruption of the Taupo Volcanic Zone, New Zealand. Results show that although zircons resided in the magmatic system for 10(3) to 10(5) years, they experienced temperatures >650 degrees to 750 degrees C for only years to centuries. This implies near-solidus long-term crystal storage, punctuated by rapid heating and cooling. Reconciling these data with existing models of magma storage requires considering multiple small intrusions and multiple spatial scales, and our approach can help to quantify heat input to and output from magma reservoirs.

DOI10.1126/science.aam8720