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Impact of fluorine on the thermal stability of phlogopite

  • Jiaqi Sun , Yan Yang , Jannick Ingrin , Zhongping Wang and Qunke Xia ORCID logo
Published/Copyright: May 5, 2022
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American Mineralogist
From the journal American Mineralogist Volume 107 Issue 5

Abstract

Knowledge of volatile cycling is vital to understanding the evolution of the planet and the life it supports. Although it has been gradually accepted that the mantle is a vast storehouse of H2O and other volatiles, the impact of coexisting volatiles on the thermal stabilities of OH and the lattice of the host mineral is still poorly understood. Phlogopite is one of the few hydrous minerals capable of carrying both water and halogens into the mantle. Previous observations from both experiments and textural relationships in natural samples have indicated that F-rich phlogopite can be stable under ultrahigh-temperature conditions. Here, the impact of F on the thermal stability of phlogopite was investigated via XRD, Raman, and IR spectroscopy from room temperature to 1000 to 1200 °C. Based on the experimental results from F-poor and F-rich natural phlogopites, we show that about 4 wt% F can increase the breakdown temperature of phlogopite by 100 °C under ambient pressure. The impact mechanism mainly involves preventing OH and lattice softening at high temperatures. This study reveals the links between F and the behavior of OH and phlogopite lattice, which is important for constraining volatile cycling, as well as the role of F in the physical and chemical properties of the upper mantle.

Keywords: Fluorine; water; thermal stability; phlogopite; mantle; Experimental Halogens in Honor of Jim Webster
‡

Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html.

Funding statement: Can Rao and Suwen Qiu are thanked for the analysis of F using EPMA. Associate editor Daniel Harlov is thanked for his extensive editing of the manuscript. This work is supported by the National Natural Science Foundation of China (41972038), the Zhejiang Province Natural Science Foundation of China (LY18D020001), and the Fundamental Research Funds for the Central Universities (K20210168).

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Received: 2021-03-11
Accepted: 2021-05-28
Published Online: 2022-05-05
Published in Print: 2022-05-25

© 2022 Mineralogical Society of America

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https://doi.org/10.2138/am-2022-8051
Keywords for this article
Fluorine; water; thermal stability; phlogopite; mantle; Experimental Halogens in Honor of Jim Webster

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  11. Specific roles of sodium for the formation process of manganese-substituted octacalcium phosphate
  12. Oxygen isotope heterogeneity of olivine crystals in orogenic peridotites from Songshugou, North Qinling Orogen: Petrogenesis and geodynamic implications
  13. Effects of arsenic on the distribution and mode of occurrence of gold during fluid-pyrite interaction: A case study of pyrite from the Qiucun gold deposit, China
  14. Xuite, Ca3Fe2[(Al,Fe)O3(OH)]3, a new mineral of the garnet group: Implications for the wide occurrence of nanominerals
  15. Raman spectroscopy-based screening of zircon for reliable water content and oxygen isotope measurements
  16. Halogen (F, Cl, Br, I) contents in silt and clay fractions of a Cambisol from a temperate forest
  17. Resolving sub-micrometer-scale zonation of trace elements in quartz using TOF-SIMS
  18. Hexagonal magnetite in Algoma-type banded iron formations of the ca. 2.52 Ga Baizhiyan Formation, North China: Evidence for a green rust precursor?
  19. Presentation of the Dana Medal of the Mineralogical Society of America for 2021 to Sergey Krivovichev
  20. Acceptance of the Dana Medal of the Mineralogical Society of America for 2021
  21. Presentation of the 2021 MSA Distinguished Public Service Medal to Denton Ebel
  22. Acceptance of the Distinguished Public Service Medal of the Mineralogical Society of America for 2021
  23. Presentation of the Mineralogical Society of America Award for 2021 to Chenguang Sun
  24. Acceptance of the Mineralogical Society of America Award for 2021
  25. Presentation of the 2021 Roebling Medal of the Mineralogical Society of America to George Rossman
  26. Acceptance of the 2021 Roebling Medal of the Mineralogical Society of America
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