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

Geiger, Harri, Troll, Valentin R., Jolis, Ester M., Deegan, Frances M., Harris, Chris, Hilton, David R. and Freda, Carmela (2018) Multi-level magma plumbing at Agung and Batur volcanoes increases risk of hazardous eruptions. Open Access Scientific Reports, 8 (Article number: 10547). DOI 10.1038/s41598-018-28125-2.

[thumbnail of s41598-018-28125-2.pdf]
Preview
Text
s41598-018-28125-2.pdf - Published Version
Available under License Creative Commons: Attribution 4.0.

Download (16MB) | Preview
[thumbnail of Geiger_Suppl.docx] Text
Geiger_Suppl.docx - Supplemental Material

Download (2MB)

Supplementary data:

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 δ18O values of 4.8‰. Clinopyroxene records magma storage at the crust-mantle boundary, and displays mantle-like isotope values for Helium (8.62 RA) and δ18O (5.0–5.8‰). Plagioclase reveals crystallisation in upper crustal storage reservoirs and shows δ18O 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.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS
Refereed: Yes
Open Access Journal?: Yes
Publisher: Nature Research
Date Deposited: 16 Jul 2018 10:10
Last Modified: 08 Feb 2021 07:37
URI: https://oceanrep.geomar.de/id/eprint/43664

Actions (login required)

View Item View Item