Formation of the 15 Å phase as the most expanded hydrated mineral in cold subduction zone

Yoonah Bang, Juhyeok Kim, Jinhyuk Choi, Heehyeon Sim, Dongzhou Zhang, Tae-Yeol Jeon, Tae Joo Shin, Hanns-Peter Liermann, Kideok D. Kwon and Yongjae Lee ()
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Yoonah Bang: Yonsei University
Juhyeok Kim: Kangwon National University
Jinhyuk Choi: Yonsei University
Heehyeon Sim: Yonsei University
Dongzhou Zhang: University of Hawaii at Manoa
Tae-Yeol Jeon: POSTECH
Tae Joo Shin: Ulsan National Institute of Science and Technology (UNIST)
Hanns-Peter Liermann: Deutsches Elektronen-Synchrotron (DESY)
Kideok D. Kwon: Kangwon National University
Yongjae Lee: Yonsei University

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract Talc, as an important class of clay minerals constituting subducting oceanic crust, has long been known to undergo interlayer expansion by ~6% to contain net ~13 wt.% water into the ‘so-called’ 10 Å phase. Although subduction fluid is mildly alkaline and includes various salts and other dissolved species, its effect on the stability of subducting minerals has not yet been considered. Here, we report that subducting talc, when exposed to alkaline salty water conditions, breaks down to form a super-hydrated 15 Å phase at ~3.0 GPa and ~350 °C, corresponding to a depth of ~90–95 km along a cold subduction geotherm. The 15 Å phase remains stable down to ~125 km depth, where it transforms into the previously known 10 Å phase. Our combined experimental and computational results show that the super-hydrated 15 Å phase contains net ~31 wt.% water through interlayer expansion by ~60%. Our work thus demonstrates mineral transformation under more realistic subduction environments, which calls for reevaluation of subduction-related geochemistry and seismicity as well as water transportation into the deep Earth.

Date: 2025
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DOI: 10.1038/s41467-025-56672-6

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