Startseite Oxidation of arcs and mantle wedges by reduction of manganese in pelagic sediments during seafloor subduction
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Oxidation of arcs and mantle wedges by reduction of manganese in pelagic sediments during seafloor subduction

  • Shuguang Song ORCID logo , Shiting Ye , Mark B. Allen , Yaoling Niu , Weidong Sun und Lifei Zhang
Veröffentlicht/Copyright: 29. September 2022
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 107 Heft 10

Abstract

Plate subduction links the Earth’s surface and interior and may change the redox state of the Earth’s mantle. Mantle wedges above subduction zones have high oxygen fugacity compared with other mantle reservoirs, but the cause is debated. Here we analyze high-pressure metamorphic rocks derived from ferromanganese pelagic sediments in the Qilian subduction complex, northwest (NW) China. We show that progressive metamorphism is a process of reducing reactions, in which Mn4+ is reduced to Mn2+. On the global scale, such reactions would release significant amounts of oxygen (~1.27 × 1012 g year−1), estimated from the global flux of MnO in sediments passing into subduction zones. This budget is sufficient to raise the oxygen fugacity of the mantle wedge, hence arc magmas, to a higher level than other mantle reservoirs. In contrast, ferric iron (Fe3+) enters hematite, aegirine, and garnet, without valence change and plays little role in the oxidation of the mantle wedge. Fe3+ remains stable to depths of >100 km but will transfer to the deeper mantle along with the subducting slab. The manganese reduction process provides a new explanation for high oxygen fugacity in the mantle wedge.

Keywords: Ferromanganese pelagic sediments; high-pressure metamorphism; reductive reactions; subduction zone; mantle oxidation

Acknowledgments and Funders

We thank G.M. Shu and X.L. Li for help in EPMA analysis and Y. Cui for help with Raman analysis. We thank Katy Evans for constructive suggestions on the early version of the manuscript. We also thank Hans-Peter Schertl, two anonymous reviewers, as well as Editor Callum J. Hetherington, for their constructive comments, which significantly improved the quality of the paper. This research is supported by the National Key Research and Development Program of China (2019YFA0708503) and National Natural Science Foundation of China (Grant No. 91955202).

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Received: 2021-06-05
Accepted: 2021-10-20
Published Online: 2022-09-29
Published in Print: 2022-10-26

© 2022 Mineralogical Society of America

Artikel in diesem Heft

  1. Experimentally derived F, Cl, and Br fluid/melt partitioning of intermediate to silicic melts in shallow magmatic systems
  2. Spectroscopic study on the local structure of sulfate ( S O 4 2 − ) incorporated in scorodite (FeAsO4·2H2O) lattice: Implications for understanding the Fe(III)-As(V)- S O 4 2 − -bearing minerals formation
  3. Oxidation of arcs and mantle wedges by reduction of manganese in pelagic sediments during seafloor subduction
  4. Raman scattering and Cr3+ luminescence study on the structural behavior of δ-AlOOH at high pressures
  5. Jadeite and related species in shocked meteorites: Limitations on inference of shock conditions
  6. Pressure-induced C23–C37 transition and compression behavior of orthorhombic Fe2S to Earth’s core pressures and high temperatures
  7. Estimating ferric iron content in clinopyroxene using machine learning models
  8. Pyradoketosite, a new, unexpected, polymorph of Ag3SbS3 from the Monte Arsiccio mine (Apuan Alps, Tuscany, Italy)
  9. Pyrite geochemistry and its implications on Au-Cu skarn metallogeny: An example from the Jiguanzui deposit, Eastern China
  10. Synthesis of ferrian and ferro-saponites: Implications for the structure of (Fe,Mg)-smectites formed under reduced conditions
  11. Natural cubic perovskite, Ca(Ti,Si,Cr)O3–δ, a versatile potential host for rock-forming and less-common elements up to Earth’s mantle pressure
  12. Nazarovite, Ni12P5, a new terrestrial and meteoritic mineral structurally related to nickelphosphide, Ni3P
  13. Zinconigerite-2N1S ZnSn2Al12O22(OH)2 and zinconigerite-6N6S Zn3Sn2Al16O30(OH)2, two new minerals of the nolanite-spinel polysomatic series from the Xianghualing skarn, Hunan Province, China
  14. Tracing structural relicts of the ikaite-to-calcite transformation in cryogenic cave glendonite
  15. Oxygen-fugacity evolution of magmatic Ni-Cu sulfide deposits in East Kunlun: Insights from Cr-spinel composition
  16. New Mineral Names
https://doi.org/10.2138/am-2022-8171
Schlagwörter für diesen Artikel
Ferromanganese pelagic sediments; high-pressure metamorphism; reductive reactions; subduction zone; mantle oxidation

Artikel in diesem Heft

  1. Experimentally derived F, Cl, and Br fluid/melt partitioning of intermediate to silicic melts in shallow magmatic systems
  2. Spectroscopic study on the local structure of sulfate ( S O 4 2 − ) incorporated in scorodite (FeAsO4·2H2O) lattice: Implications for understanding the Fe(III)-As(V)- S O 4 2 − -bearing minerals formation
  3. Oxidation of arcs and mantle wedges by reduction of manganese in pelagic sediments during seafloor subduction
  4. Raman scattering and Cr3+ luminescence study on the structural behavior of δ-AlOOH at high pressures
  5. Jadeite and related species in shocked meteorites: Limitations on inference of shock conditions
  6. Pressure-induced C23–C37 transition and compression behavior of orthorhombic Fe2S to Earth’s core pressures and high temperatures
  7. Estimating ferric iron content in clinopyroxene using machine learning models
  8. Pyradoketosite, a new, unexpected, polymorph of Ag3SbS3 from the Monte Arsiccio mine (Apuan Alps, Tuscany, Italy)
  9. Pyrite geochemistry and its implications on Au-Cu skarn metallogeny: An example from the Jiguanzui deposit, Eastern China
  10. Synthesis of ferrian and ferro-saponites: Implications for the structure of (Fe,Mg)-smectites formed under reduced conditions
  11. Natural cubic perovskite, Ca(Ti,Si,Cr)O3–δ, a versatile potential host for rock-forming and less-common elements up to Earth’s mantle pressure
  12. Nazarovite, Ni12P5, a new terrestrial and meteoritic mineral structurally related to nickelphosphide, Ni3P
  13. Zinconigerite-2N1S ZnSn2Al12O22(OH)2 and zinconigerite-6N6S Zn3Sn2Al16O30(OH)2, two new minerals of the nolanite-spinel polysomatic series from the Xianghualing skarn, Hunan Province, China
  14. Tracing structural relicts of the ikaite-to-calcite transformation in cryogenic cave glendonite
  15. Oxygen-fugacity evolution of magmatic Ni-Cu sulfide deposits in East Kunlun: Insights from Cr-spinel composition
  16. New Mineral Names
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