Startseite Stability of magnesite in the presence of hydrous fluids up to 12 GPa: Insights into subduction zone processes and carbon cycling in the Earth’s mantle
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Stability of magnesite in the presence of hydrous fluids up to 12 GPa: Insights into subduction zone processes and carbon cycling in the Earth’s mantle

  • Melanie J. Sieber EMAIL logo , Hans Josef Reichmann , Robert Farla und Monika Koch-Müller ORCID logo
Veröffentlicht/Copyright: 9. Juli 2024
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 109 Heft 7

Abstract

Understanding the stability of magnesite in the presence of a hydrous fluid in the Earth’s upper mantle is crucial for modeling the carbon budget and cycle in the deep Earth.

This study elucidates the behavior of magnesite in the presence of hydrous fluids. We examined the brucite-magnesite [Mg(OH)2-MgCO3] system between 1 and 12 GPa by using synchrotron in situ energy-dispersive X-ray diffraction experiments combined with textural observations from quenched experiments employing the falling sphere method. By subjecting magnesite to varying pressure-temperature conditions with controlled fluid proportion, we determined the stability limits of magnesite in the presence of a fluid and periclase.

The observed liquidus provides insights into the fate of magnesite-bearing rocks in subduction zones. Our findings show that magnesite remains stable under typical subduction zone gradients even when infiltrated by hydrous fluids released from dehydration reactions during subduction. We conclude that magnesite can be subducted down to and beyond sub-arc depths. Consequently, our results have important implications for the carbon budget of the Earth’s mantle and its role in regulating atmospheric CO2 levels over geological timescales.

Keywords: Deep carbon cycle; brucite dehydration; magnesite melting; EDXRD; Physics and Chemistry of Earth’s Deep Mantle and Core
Present address: University of Potsdam, Institute for Geosciences, Karl-Liebknecht-Strasse 24-25, D-14467 Potsdam, Germany.

‡ Special collection papers can be found online at our website in the Special Collection section

Acknowledgments

We are grateful to A. Ebert (GFZ), C. Günter (Uni Potsdam), L. Koldeweyh (Uni Potsdam), A. Schreiber (GFZ), S. Bhat (DESY), and C. Lathe (GFZ) for their assistance in experimental and analytical work. We acknowledge constructive comments and suggestion from O. Lord and S. Dorfman. We thank S. Dorfman for editorial handing of the paper.

This study was funded by the DFG-funded research group FOR2125 CarboPaT under the grant number KO1260/19-1. We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Parts of this research were carried out at beamline P61B (Proposal I-20200568 and I-20210429) with the support from the Federal Ministry of Education and Research, Germany (BMBF, grant nos. 05K16WC2 and 05K13WC2). The authors also acknowledge the scientific exchange and support of the Centre for Molecular Water science (CMWS).

  1. Authors contribution statement: M.J.S. performed the experiments and analysis, evaluated the data and wrote the manuscript. H.J.R. and M.K.M. designed the research proposal, contributed to the discussion of the results and manuscript preparation. H.J.R., R.F., and M.K.M. helped performing in situ experiments and acquisition of EDXRD data. All authors approved the (revised) version of the manuscript to be submitted to American Mineralogist.

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Received: 2023-02-24
Accepted: 2023-10-04
Published Online: 2024-07-09
Published in Print: 2024-07-26

© 2024 by Mineralogical Society of America

Artikel in diesem Heft

  1. Reduced charge transfer in mixed-spin ferropericlase inferred from its high-pressure refractive index
  2. Stability of magnesite in the presence of hydrous fluids up to 12 GPa: Insights into subduction zone processes and carbon cycling in the Earth’s mantle
  3. Influence of Fe(II), Fe(III), and Al(III) isomorphic substitutions on acid-base properties of edge surfaces of cis-vacant montmorillonite: Insights from first-principles molecular dynamics simulations and surface complexation modeling
  4. The kinetic effect induced by variable cooling rate on the crystal-chemistry of spinel in basaltic systems revealed by EPMA mapping
  5. Machine-learning oxybarometer developed using zircon trace-element chemistry and its applications
  6. Experimental determination of Si, Mg, and Ca isotope fractionation during enstatite melt evaporation
  7. Quartz texture and the chemical composition fingerprint of ore-forming fluid evolution at the Bilihe porphyry Au deposit, NE China
  8. Zhengminghuaite, Cu6Fe3As4S12, a new sulfosalt mineral from the Zimudang Carlin-type gold deposit in southwestern Guizhou, China
  9. Magmatic degassing and fluid metasomatism promote compositional variation from I-type to peralkaline A-type granite in the late Cretaceous Fuzhou felsic complex, SE China
  10. The new mineral cuprozheshengite, Pb4CuZn2(AsO4)2(PO4)2(OH)2, from Yunnan, China, with site-selective As-P substitution
  11. A neutron diffraction study of the hydrous borate inderborite, CaMg[B3O3(OH)5]2(H2O)4·2H2O
  12. Bobfinchite, Na[(UO2)8O3(OH)11]·10H2O, a new Na-bearing member of the schoepite family
  13. Kenorozhdestvenskayaite-(Fe), Ag6(Ag4Fe2)Sb4S12□: A new tetrahedrite group mineral containing a natural [Ag6]4+ cluster and its relationship to the synthetic ternary phosphide (Ag6M4P12) M6′
  14. Compressibility and pressure-induced structural evolution of kokchetavite, hexagonal polymorph of KAlSi3O8, by single-crystal X-ray diffraction
  15. Local strain heterogeneity associated with Al/Si ordering in anorthite, CaAl2Si2O8, with implications for thermodynamic mixing behavior and trace element partitioning in plagioclase feldspars
  16. Letter
  17. The glass transition temperature of anhydrous amorphous calcium carbonate
  18. Book Review
  19. Book Review: Introduction to Mineralogy
https://doi.org/10.2138/am-2023-8982
Schlagwörter für diesen Artikel
Deep carbon cycle; brucite dehydration; magnesite melting; EDXRD; Physics and Chemistry of Earth’s Deep Mantle and Core

Artikel in diesem Heft

  1. Reduced charge transfer in mixed-spin ferropericlase inferred from its high-pressure refractive index
  2. Stability of magnesite in the presence of hydrous fluids up to 12 GPa: Insights into subduction zone processes and carbon cycling in the Earth’s mantle
  3. Influence of Fe(II), Fe(III), and Al(III) isomorphic substitutions on acid-base properties of edge surfaces of cis-vacant montmorillonite: Insights from first-principles molecular dynamics simulations and surface complexation modeling
  4. The kinetic effect induced by variable cooling rate on the crystal-chemistry of spinel in basaltic systems revealed by EPMA mapping
  5. Machine-learning oxybarometer developed using zircon trace-element chemistry and its applications
  6. Experimental determination of Si, Mg, and Ca isotope fractionation during enstatite melt evaporation
  7. Quartz texture and the chemical composition fingerprint of ore-forming fluid evolution at the Bilihe porphyry Au deposit, NE China
  8. Zhengminghuaite, Cu6Fe3As4S12, a new sulfosalt mineral from the Zimudang Carlin-type gold deposit in southwestern Guizhou, China
  9. Magmatic degassing and fluid metasomatism promote compositional variation from I-type to peralkaline A-type granite in the late Cretaceous Fuzhou felsic complex, SE China
  10. The new mineral cuprozheshengite, Pb4CuZn2(AsO4)2(PO4)2(OH)2, from Yunnan, China, with site-selective As-P substitution
  11. A neutron diffraction study of the hydrous borate inderborite, CaMg[B3O3(OH)5]2(H2O)4·2H2O
  12. Bobfinchite, Na[(UO2)8O3(OH)11]·10H2O, a new Na-bearing member of the schoepite family
  13. Kenorozhdestvenskayaite-(Fe), Ag6(Ag4Fe2)Sb4S12□: A new tetrahedrite group mineral containing a natural [Ag6]4+ cluster and its relationship to the synthetic ternary phosphide (Ag6M4P12) M6′
  14. Compressibility and pressure-induced structural evolution of kokchetavite, hexagonal polymorph of KAlSi3O8, by single-crystal X-ray diffraction
  15. Local strain heterogeneity associated with Al/Si ordering in anorthite, CaAl2Si2O8, with implications for thermodynamic mixing behavior and trace element partitioning in plagioclase feldspars
  16. Letter
  17. The glass transition temperature of anhydrous amorphous calcium carbonate
  18. Book Review
  19. Book Review: Introduction to Mineralogy
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