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Phase relations and formation of K-bearing Al-10 Å phase in the MORB+H2O system: Implications for H2O- and K-cycles in subduction zones

  • Renbiao Tao , Lifei Zhang EMAIL logo , Xi Liu , Thomas Bader and Yingwei Fei
Published/Copyright: September 5, 2017
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American Mineralogist
From the journal American Mineralogist Volume 102 Issue 9

Abstract

The potassium (K) and water (H2O) cycles in subduction zones are predominately controlled by the stability of K- and H2O-bearing minerals, such as K-mica, lawsonite, and dense hydrous magnesium silicates (DHMS). K-micas (muscovite or phlogopite) are the principal H2O and K hosts in subduction zones and Earth’s upper mantle and play a significant role in the deep H2O and K cycles. The Mg-10 Å phase, normally appearing in hydrated peridotite in high-pressure experiments, has been considered as an important water-carrier in subducted hydrated peridotite. In this study, we found a K-bearing Al-10 Å phase in the MORB+H2O system (hydrated basalt) at high pressures according to X-ray diffraction and stoichiometry. We experimentally constrained its stability field at high pressure. By considering newly and previously documented compositions of the 10 Å phase and micas, we confirmed a continuous solid solution or mixed layering between the 10 Å phase and K-mica at the interlayer site, suggesting that the K cycle and the H2O cycle in subduction zones are coupled. From the discussion of the effect of fH2o on stability of the Al-10 Å phase, we conclude that a cold subduction zone can host and carry more bulk H2O and K into Earth’s deep mantle than a hot one. This work expands the stability regions of the 10 Å phase from the ultramafic system (Mg-10 Å phase) to the mafic system (Al-10 Å phase), and emphasizes the significance of the 10 Å phase for the deep H2O and K cycle in subduction zone.

Keywords: H2O- and K-cycle; Al-10 Å phase; K-mica; high pressure; subduction zone

Acknowledgments

This work was supported by the National Natural Science Foundation of China (41330210; 41520104004; 41502038; 41272069; 41350110224) and the China Postdoctoral Science Fundation (2015M570009). We thank Xiang Wu, Chunjing Wei, reviewers (Alison Pawley and an anonymous reviewer) and editor (Oliver Tschauner) for their constructive suggestions, and Ye Wu, Qiang He, Fei Wang, Hejing Wang and Xiaoli Li for their assistance with instruments used in this study.

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Received: 2016-11-19
Accepted: 2017-5-4
Published Online: 2017-9-5
Published in Print: 2017-9-26

© 2017 by Walter de Gruyter Berlin/Boston

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  36. EosFit-Pinc: A simple GUI for host-inclusion elastic thermobarometry
  38. New Mineral Names
https://doi.org/10.2138/am-2017-6025
Keywords for this article
H2O- and K-cycle; Al-10 Å phase; K-mica; high pressure; subduction zone

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