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Super-hydration and reduction of manganese oxide minerals at shallow terrestrial depths

Author

Listed:
  • Seohee Yun

    (Yonsei University)

  • Huijeong Hwang

    (Yonsei University
    GIST)

  • Gilchan Hwang

    (Yonsei University)

  • Yeongkyoo Kim

    (Kyungpook National University)

  • Douglas Blom

    (University of South Carolina)

  • Thomas Vogt

    (University of South Carolina)

  • Jeffrey E. Post

    (Smithsonian Institution)

  • Tae-Yeol Jeon

    (Beamline Science Division, Pohang Accelerator Laboratory)

  • Tae Joo Shin

    (Graduate School of Semiconductor Materials and Devices Engineering, UNIST)

  • Dong-Zhou Zhang

    (University of Hawaii at Manoa)

  • Hiroyuki Kagi

    (The University of Tokyo)

  • Yongjae Lee

    (Yonsei University)

Abstract

Manganese oxides are ubiquitous marine minerals which are redox sensitive. As major components of manganese nodules found on the ocean floor, birnessite and buserite have been known to be two distinct water-containing minerals with manganese octahedral interlayer separations of ~7 Å and ~10 Å, respectively. We show here that buserite is a super-hydrated birnessite formed near 5 km depth conditions. As one of the most hydrous minerals containing ca. 34.5 wt. % water, super-hydrated birnessite, i.e., buserite, remains stable up to ca. 70 km depth conditions, where it transforms into manganite by releasing ca. 24.3 wt. % water. Subsequent transformations to hausmannite and pyrochroite occur near 100 km and 120 km depths, respectively, concomitant with a progressive reduction of Mn4+ to Mn2+. Our work forwards an abiotic geochemical cycle of manganese minerals in subduction and/or other aqueous terrestrial environments, with implications for water storage and cycling, and the redox capacity of the region.

Suggested Citation

  • Seohee Yun & Huijeong Hwang & Gilchan Hwang & Yeongkyoo Kim & Douglas Blom & Thomas Vogt & Jeffrey E. Post & Tae-Yeol Jeon & Tae Joo Shin & Dong-Zhou Zhang & Hiroyuki Kagi & Yongjae Lee, 2022. "Super-hydration and reduction of manganese oxide minerals at shallow terrestrial depths," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29328-y
    DOI: 10.1038/s41467-022-29328-y
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    References listed on IDEAS

    as
    1. Haemyeong Jung & Harry W. Green II & Larissa F. Dobrzhinetskaya, 2004. "Intermediate-depth earthquake faulting by dehydration embrittlement with negative volume change," Nature, Nature, vol. 428(6982), pages 545-549, April.
    2. Matthieu E. Galvez & James A. D. Connolly & Craig E. Manning, 2016. "Implications for metal and volatile cycles from the pH of subduction zone fluids," Nature, Nature, vol. 539(7629), pages 420-424, November.
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