M. Pistone
Gas-driven filter pressing in magmas: Insights into in-situ melt segregation from crystal mushes
Pistone, M.; Arzilli, F.; Dobson, K.J.; Cordonnier, B.; Reusser, E.; Ulmer, P.; Marone, F.; Whittington, A.G.; Mancini, L.; Fife, J.L.; Blundy, J.D.
Authors
F. Arzilli
K.J. Dobson
B. Cordonnier
E. Reusser
P. Ulmer
F. Marone
A.G. Whittington
L. Mancini
J.L. Fife
J.D. Blundy
Abstract
Gas-driven filter pressing is the process of melt expulsion from a volatile-saturated crystal mush, induced by the buildup and subsequent release of gas pressure. Filter pressing is inferred to play a major role in magma fractionation at shallow depths (<10 km) by moving melt and gas relative to the solid, crystalline framework. However, the magmatic conditions at which this process operates remain poorly constrained. We present novel experimental data that illustrate how the crystal content of the mush affects the ability of gas-driven filter pressing to segregate melt. Hydrous haplogranite (2.1 wt% water in the melt) and dacite (4.2 wt% water in the melt) crystal mushes, with a wide range of crystallinities (34–80 vol% crystals), were investigated using in-situ, high-temperature (500–800 °C) synchrotron X-ray tomographic microscopy with high spatial (3 μm/pixel) and temporal resolution (∼8 s per three-dimensional data set). Our experimental results show that gas-driven filter pressing operates only below the maximum packing of bubbles and crystals (∼74 vol%). Above this threshold, the mush tends to fracture and gas escapes via fractures. Therefore, the efficiency of gas-driven filter pressing is promoted close to the percolation threshold and in situations where a mush inflates slowly relative to build-up of pressure and expulsion of melt. Such observations offer a likely explanation for the production of eruptible, crystal-poor magmas within Earth’s crust.
Citation
Pistone, M., Arzilli, F., Dobson, K., Cordonnier, B., Reusser, E., Ulmer, P., …Blundy, J. (2015). Gas-driven filter pressing in magmas: Insights into in-situ melt segregation from crystal mushes. Geology, 43(8), 699-702. https://doi.org/10.1130/g36766.1
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 1, 2015 |
Online Publication Date | Jul 1, 2015 |
Publication Date | Aug 1, 2015 |
Deposit Date | May 5, 2016 |
Publicly Available Date | Mar 28, 2024 |
Journal | Geology |
Print ISSN | 0091-7613 |
Electronic ISSN | 1943-2682 |
Publisher | Geological Society of America |
Peer Reviewed | Peer Reviewed |
Volume | 43 |
Issue | 8 |
Pages | 699-702 |
DOI | https://doi.org/10.1130/g36766.1 |
Files
Accepted Journal Article
(609 Kb)
PDF
You might also like
In situ observation of the percolation threshold in multiphase magma analogues
(2020)
Journal Article
Vesicle shrinkage in hydrous phonolitic melt during cooling
(2020)
Journal Article
Downloadable Citations
About Durham Research Online (DRO)
Administrator e-mail: dro.admin@durham.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search