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Multi-level magma plumbing at Agung and Batur volcanoes increases risk of hazardous eruptions

TitleMulti-level magma plumbing at Agung and Batur volcanoes increases risk of hazardous eruptions
Publication TypeJournal Article
Year of Publication2018
AuthorsGeiger H., Troll V.R, Jolis E.M, Deegan F.M, Harris C., Hilton DR, Freda C.
JournalScientific Reports
Volume8
Date Published2018/07
Type of ArticleArticle
ISBN Number2045-2322
Accession NumberWOS:000438343600057
Keywordsarc magmas; caldera-forming eruptions; crustal contamination; crystallization; equilibria; fractional; Igneous rocks; krakatau volcano; merapi volcano; oxidation-state; oxygen-isotope composition; plus liquid; Science & Technology - Other Topics
Abstract

The island of Bali in Indonesia is home to two active stratovolcanoes, Agung and Batur, but relatively little is known of their underlying magma plumbing systems. Here we define magma storage depths and isotopic evolution of the 1963 and 1974 eruptions using mineral-melt equilibrium thermobarometry and oxygen and helium isotopes in mineral separates. Olivine crystallised from a primitive magma and has average delta O-18 values of 4.8%. Clinopyroxene records magma storage at the crust-mantle boundary, and displays mantle-like isotope values for Helium (8.62 R-A) and delta O-18 (5.0-5.8%). Plagioclase reveals crystallisation in upper crustal storage reservoirs and shows delta O-18 values of 5.5-6.4%. Our new thermobarometry and isotope data thus corroborate earlier seismic and InSAR studies that inferred upper crustal magma storage in the region. This type of multi-level plumbing architecture could drive replenishing magma to rapid volatile saturation, thus increasing the likelihood of explosive eruptions and the consequent hazard potential for the population of Bali.

DOI10.1038/s41598-018-28125-2
Short TitleSci Rep
Student Publication: 
No
Research Topics: