A role for subducted albite in the water cycle and alkalinity of subduction fluids

Gil Chan Hwang, Huijeong Hwang, Yoonah Bang, Jinhyuk Choi, Yong Park, Tae Yeol Jeon, Boknam Chae, Haemyeong Jung, Yongjae Lee

Research output: Contribution to journalArticlepeer-review

Abstract

Albite is one of the major constituents in the crust. We report here that albite, when subjected to hydrous cold subduction conditions, undergoes hitherto unknown breakdown into hydrated smectite, moganite, and corundum, above 2.9 GPa and 290 °C or about 90 km depth conditions, followed by subsequent breakdown of smectite into jadeite above 4.3 GPa and 435 °C or near 135 km depth. Upon the hydration into smectite, the fluid volume of the system decreases by ~14 %, whereas it increases by ~8 % upon its dehydration into jadeite. Both the hydration and dehydration depths are correlated to increases in seismicity by 93 % and 104 %, respectively, along the South Mariana trench over the past 5 years. Moreover, the formation of smectite is accompanied by the release of OH species, which would explain the formation of moganite and expected alkalinity of the subducting fluid. Thus, we shed new insights into the mechanism of water transport and related geochemical and geophysical activities in the contemporary global subduction system.

Original languageEnglish
Article number1155
JournalNature communications
Volume12
Issue number1
DOIs
Publication statusPublished - 2021 Dec

Bibliographical note

Funding Information:
This work was supported by the Leader Researcher program (NRF-2018R1A3B1052042) of the Korean Ministry of Science, ICT and Planning (MSIP). We also thank the support of the NRF-2016K1A4A3914691, NRF-2019K1A3A7A09033395, and NRF-2020R1A2C2003765. Experiments using synchrotron radiation were supported by Pohang Accelerator Laboratory (PAL).

Publisher Copyright:
© 2021, The Author(s).

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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