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  5. MafiCH: a general model for H2O–CO2 solubility in mafic magmas
 
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MafiCH: a general model for H2O–CO2 solubility in mafic magmas

Author(s)
Allison, Chelsea M 
Roggensack, Kurt 
Clarke, Amanda B. 
Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Pisa, Pisa, Italia 
Language
English
Obiettivo Specifico
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Contributions to Mineralogy and Petrology 
Issue/vol(year)
/177 (2022)
ISSN
0010-7999
Publisher
Springer
Pages (printed)
40
Issued date
2022
DOI
10.1007/s00410-022-01903-y
URI
https://www.earth-prints.org/handle/2122/16301
Subjects
Gas solubility in magma
Keywords
  • Solubility

  • Mafic magma

Abstract
The solubility of CO2 in mafic magmas is strongly dependent on magma composition, which ultimately affects magma storage conditions and eruptive behavior. Recent experimental work showed that previously published volatile solubility models for mafic magmas are not well calibrated at mid-crustal pressures (400–600 MPa). Using a simple thermodynamic model, here we construct a general CO2 solubility model for mafic magmas by establishing the compositional dependence of two key thermodynamic parameters. The model is calibrated using experimental data from 10 magma compositions that span a range of pressures as well as silica (44–53 wt.%) and total alkali (2–9 wt.%) contents. We also survey the experimental literature for relevant H2O solubility data to determine how to model H2O solubility for these magmas. We combine these separate CO2 and H2O solubility models into a single general model for mixed-fluid (H2O–CO2) solubility in mafic magmas called MafiCH. We test the MafiCH model using experiments from three compositions that fall both within and beyond the calibrated range, and find that the model accurately constrains the CO2 solubility of depolymerized magmas. Sensitivity tests identify that Na, Ca, and Al have the largest effect on CO2 solubility while Si and Mg do not play a strong role in CO2 solubility in mafic, depolymerized melts. Overall, saturation pressures calculated using the new model presented here are typically lower than those predicted by previous models. The model provides a new framework to interpret volcanic data from mafic magma compositions for which no experimental data is available.
Sponsors
NSF grants EAR-1322078 and EAR-1642569
Type
article
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s00410-022-01903-y.pdf

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