| Title: |
The influence of magma storage and ascent conditions on Laguna del Maule rhyolite eruptions |
| Authors: |
Contreras Hidalgo, Claudio; Cashman, Katharine V; Rust, Alison C; Cortex, Marcelo |
| Source: |
Contreras Hidalgo, C, Cashman, K V, Rust, A C & Cortex, M 2022, 'The influence of magma storage and ascent conditions on Laguna del Maule rhyolite eruptions', Journal of Petrology, vol. 63, no. 12, egac121. https://doi.org/10.1093/petrology/egac121 |
| Publication Year: |
2022 |
| Collection: |
University of Bristol: Bristol Reserach |
| Description: |
The scarcity of historical rhyolite eruptions means that volcanological and petrological studies of past eruptions are a key tool for assessing the potential for future hazardous activity and improving interpretations of unrest signals. For the last 18 ky, the Laguna del Maule volcanic complex (LdM) in Chile has erupted primarily rhyolites but with differing magma compositions, eruption styles and eruptive volumes. Rapid surface uplift and episodic seismic activity at LdM over the last two decades has emphasized the need to understand both the recent evolution of the magmatic system and the most likely future eruption scenarios. Using mineral composition, geothermobarometry and MELTS modelling, we assess the influence of the magma storage and ascent conditions on the magnitude and styles of three LdM rhyolites. Magmas of the first and largest Plinian-ignimbrite eruption (Laguna del Maule: rdm; >17 km3 DRE) form a distinct mineral assemblage with An28-60 plagioclase, amphibole and quartz derived from a magma plumbing system over a large pressure range (90-350 MPa). We suggest that the rdm eruption was triggered by magma recharge and overpressure within a ~90 MPa magma chamber of high-silica (>76.5 wt.% SiO2) rhyolitic melt. The rdm eruption appears to have reset the LdM storage conditions, such that subsequent rhyolite eruptions have been smaller ( |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| Relation: |
info:eu-repo/semantics/altIdentifier/hdl/https://hdl.handle.net/1983/871a07e0-f424-4514-aaa4-3ee2753408d4 |
| DOI: |
10.1093/petrology/egac121 |
| Availability: |
https://hdl.handle.net/1983/871a07e0-f424-4514-aaa4-3ee2753408d4; https://research-information.bris.ac.uk/en/publications/871a07e0-f424-4514-aaa4-3ee2753408d4; https://doi.org/10.1093/petrology/egac121; https://research-information.bris.ac.uk/ws/files/373494577/Contreras_2022_JPet.pdf |
| Rights: |
info:eu-repo/semantics/openAccess ; http://creativecommons.org/licenses/by/4.0/ |
| Accession Number: |
edsbas.BD79EA6C |
| Database: |
BASE |