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Hydrogen incorporation in enstatite in the system MgO-SiO2-H2O-NaCl

Stalder, Roland
Kronz, Andreas
Simon, Klaus
Journal: Contributions to mineralogy and petrology, Contributions to mineralogy and petrology, 2008
156, 5: 653 - 659
DOI: https://doi.org/10.1007/s00410-008-0306-0
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/6734
Stalder, Roland; Kronz, Andreas; Simon, Klaus, 2008: Hydrogen incorporation in enstatite in the system MgO-SiO2-H2O-NaCl. In: Stalder, Roland; Kronz, Andreas; Simon, Klaus (2008):Hydrogen incorporation in enstatite in the system MgO-SiO2-H2O-NaCl - Contributions to mineralogy and petrology; Vol. 156, Nr. 5, p. 653-659, DOI: 10.1007/s00410-008-0306-0.
 
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  • Abstract
The incorporation of hydrogen in enstatite in a hydrous system containing various amounts of NaCl was investigated at 25 kbar. The hydrogen content in enstatite shows a clear negative correlation to the NaCl-concentration in the system. The most favourable explanation is the reduction of water fugacity due to dilution. Other reasons for the limited hydrogen incorporation at high NaCl levels, such as a significant influence of Na+ on the defect chemistry or an exchange between OH- and Cl-in enstatite, appear much less important. A partition coefficient D Na En/Fluid = 0.0013 could be determined, demonstrating that Na is less incompatible in enstatite than H. The new results support the idea that dissolved components have to be considered when the total hydrogen storage capacity in nominally anhydrous minerals is estimated, especially in geological settings with high levels of halogens, such as subduction zones.
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