Super-hydration and reduction of manganese oxide minerals at shallow terrestrial depths
Journal Article
·
· Nature Communications
- Yonsei Univ., Seoul (Korea, Republic of)
- Yonsei Univ., Seoul (Korea, Republic of); Gwangju Institute of Science and Technology (GIST) (Korea, Republic of)
- Kyungpook National Univ., Daegu (Korea, Republic of)
- Univ. of South Carolina, Columbia, SC (United States)
- Smithsonian Institute, Washington, DC (United States)
- Pohang Accelerator Lab. (PAL) (Korea, Republic of)
- Ulsan National Institute of Science and Technology (UNIST), Ulsan (Korea, Republic of)
- Univ. of Hawaii at Manoa, Honolulu, HI (United States)
- Univ. of Tokyo (Japan)
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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- National Research Foundation of Korea (NRF); National Science Foundation (NSF); USDOE
- Grant/Contract Number:
- FG02-94ER14466
- OSTI ID:
- 1863992
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
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