Articles | Volume 34, issue 2
Eur. J. Mineral., 34, 201–213, 2022
https://doi.org/10.5194/ejm-34-201-2022
Eur. J. Mineral., 34, 201–213, 2022
https://doi.org/10.5194/ejm-34-201-2022
Research article
31 Mar 2022
Research article | 31 Mar 2022

In situ reinvestigation of reaction phase A plus high-pressure clinoenstatite to forsterite plus water in the system MgO-SiO2-H2O (MSH)

Christian Lathe et al.

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Cited articles

Anderson, O. and Bowen, N.L.: Das binäre System Magnesiumoxyd-Silicium-2-oxyd, Z. Anorg. Chem., 87, 283–299, 1914. 
Angel, R. J. and Hugh-Jones, D. A.: Equations of state and thermodynamic properties of enstatite pyroxenes, J. Geophys. Res., 99, 19777-19783, https://doi.org/10.1029/94JB01750, 1994. 
Angel, R. J., Frost, D. J., Ross, N. L., and Hemley, R.: Stabilities and equations of state of dense hydrous magnesium silicates, Phys. Earth Planet. In., 127, 181–196, https://doi.org/10.1016/S0031-9201(01)00227-8, 2001. 
Armstrong, J. T.: CITZAF: A package of correction programs for the quantitative electron microbeam X-ray analysis of thick polished materials, thin films, and particles, Microb. Anal., 4, 177–200, 1995. 
Bromiley, G. D. and Bromiley, F. A.: High-pressure phase transitions and hydrogen incorporation into MgSiO3 enstatite, Am. Mineral., 91, 1094–1101, https://doi.org/10.2138/am.2006.2020, 2006. 
Short summary
The equilibrium phase of A + HP clinoenstatite = forsterite + water was experimentally investigated at aH2O = 1 in situ. In cold subducting slabs, it is of relevance to transport water to large depths, initiating the formation of dense hydrous magnesium silicate (DHMS). At normal gradients, the huge water amount from this reaction induces important processes within the overlying mantle wedge. We additionally discuss the relevance of this reaction for intermediate-depth earthquake formation.