Degruyter, Wim, Christian, Huber, Olivier, Bachmann, Cooper, Kari M and Kent, Adam J.R
2017.
Influence of exsolved volatiles on reheating silicic magmas by recharge and consequences for eruptive style at Volcan Quizapu (Chile).
Geochemistry, Geophysics, Geosystems
18
(11)
, pp. 4123-4135.
10.1002/2017GC007219
|
Abstract
The two most recent eruptions of Volcan Quizapu (southern Andes, Chile), only 85 years apart,
were both triggered by magma recharge and extruded the same volume (about 5 km3) of the same
volatile-rich dacitic magma, but showed a remarkable shift from effusive (1846–1847) to explosive (1932)
behavior. We demonstrate, using a newly developed model, that the presence or absence of an exsolved
volatile phase in the reservoir strongly influences its mechanical and thermal response to new inputs of
magma. We propose that, prior to the 1846–1847 effusive eruption, gas bubbles damped the build-up of
excess pressure and allowed recharge of a significant volume of magma before triggering the 1846–1847
eruption. The strong temperature increase that resulted enhanced syneruptive outgassing leading to an
effusive eruption. In contrast, during the repose period between the 1847 and 1932 eruptions, new
recharges found a much less compressible host reservoir as the exsolved gas phase was largely removed in
response to the prior eruption, yielding rapid pressurization, minor reheating, and comparatively less
syneruptive outgassing. The combination of these effects culminated in an explosive eruption.
Item Type: |
Article
|
Date Type: |
Publication |
Status: |
Published |
Schools: |
Earth and Ocean Sciences |
Publisher: |
American Geophysical Union |
ISSN: |
1525-2027 |
Date of First Compliant Deposit: |
1 November 2017 |
Date of Acceptance: |
23 October 2017 |
Last Modified: |
23 Jul 2020 01:39 |
URI: |
http://orca.cf.ac.uk/id/eprint/106124 |
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