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A revisit to the phase transition behavior of K-feldspar at high-pressure and high-temperature: Implications on metastable K-feldspar in cold subduction

  • He Chengcheng ORCID logo and Heping Li
Published/Copyright: March 11, 2024
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American Mineralogist
From the journal American Mineralogist Volume 109 Issue 3

Abstract

Felsic gneiss is a major type of ultrahigh-pressure metamorphic rock in continental subduction zones. As an important mineral of felsic gneiss, the phase behavior of K-feldspar is of great significance for studying subducting seismic activities, crust-mantle interactions, and plate tectonics in the Earth’s interior. In this study, we investigated the phase relations in K-feldspar using Raman spectroscopy combined with externally heating diamond-anvil cell (DAC) under high-pressure (28 GPa), high-temperature (400 °C), and simultaneous high pressure-temperature (P-T) (14 GPa, 430 °C) conditions. The phase diagram of K-feldspar at relatively low temperatures has been constructed, and together with previous results, a more comprehensive P-T phase diagram of K-feldspar is established. K-feldspar undergoes a reversible phase transition from C 1 ¯  to  P 1 ¯ (metastable K-feldspar) symmetry at 10.3 GPa. Metastable K-feldspar is an intermediate phase from K-feldspar to K-holl-I (KAlSi3O8 with a hollandite-I structure) in extremely cold subduction slabs (<2 °C/km) or the center of some old, cold, and rapidly subducting slabs. Metastable K-feldspar is stable even at 11.4 GPa and 400 °C in enriched hydroxyl group (OH) environments, which shows greater high-P-T stability than K-feldspar. Thus metastable K-feldspar could withstand subduction-zone fluids, low-temperature metamorphism, and survive to deeper than previously expected. These results enhance our understanding of the formation paths and conditions of K-holl-I, the subducted depth of K-feldspar, the efect of subduction-zone fluids on continental subduction, and provide a possible reason for the origin of intermediate- and deep-focused seismicity.

Keywords: Metastable K-feldspar; Raman spectroscopy; high-pressure-temperature conditions; continental subduction; subduction-zone fluids; Physics and Chemistry of Earth’s Deep Mantle and Core

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

Acknowledgments and Funding

We appreciate two anonymous reviewers for their constructive suggestions and comments, which helped improve the manuscript significantly. This work was financially supported by the project of the National Natural Science Foundation of China (U1812402).

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Received: 2022-11-21
Accepted: 2023-05-06
Published Online: 2024-03-11
Published in Print: 2024-03-25

© 2024 by Mineralogical Society of America

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https://doi.org/10.2138/am-2022-8877
Keywords for this article
Metastable K-feldspar; Raman spectroscopy; high-pressure-temperature conditions; continental subduction; subduction-zone fluids; Physics and Chemistry of Earth’s Deep Mantle and Core

Articles in the same Issue

  1. The efects of oxygen fugacity and sulfur on the pressure of vapor-saturation of magma
  2. Vergasovaite to cupromolybdite topotactic transformation with crystal shape preservation
  3. Experimental study on the kinetics of magnesiohornblende dehydration and its implications
  4. Thermal behavior of borax, Na2B4O5(OH)4·8H2O
  5. The composition of mackinawite
  6. Halogen fractionation during vapor-brine phase separation revealed by in situ Cl, Br, and I analysis of scapolite from the Yixingzhai gold deposit, North China Craton
  7. The effects of oxygen fugacity and sulfur on the pressure of vapor-saturation of magma
  8. A revisit to the phase transition behavior of K-feldspar at high-pressure and high-temperature: Implications on metastable K-feldspar in cold subduction
  9. Equation of state and structural evolution of manganese dolomite (kutnohorite) under high pressures
  10. A possible origin of the lunar spinel-bearing lithologies as told by the meteorite NWA 13191
  11. Vergasovaite to cupromolybdite topotactic transformation with crystal shape preservation
  12. Thermal conductivity of aluminous garnets in Earth’s deep interior
  13. Interaction of seawater with (ultra)mafic alkaline rocks—Alternative process for the formation of aegirine
  14. Experimental study on the kinetics of magnesiohornblende dehydration and its implications
  15. Predicting olivine formation environments using machine learning and implications for magmatic sulfide prospecting
  16. Reaction between volatile-bearing eclogite and harzburgite as a function of degree of interaction: Experimental constraints at 4 GPa
  17. Thermal behavior of borax, Na2B4O5(OH)4·8H2O
  18. Multiple magmatic processes revealed by distinct clinopyroxene populations in the magma plumbing system: A case study from a Miocene volcano in West Qinling, Central China
  19. Genetic implications, composition, and structure of trioctahedral micas in xenoliths related to Plinian eruptions from the Somma-Vesuvius volcano (Italy)
  20. Magmatic and hydrothermal controls on diverse Nb mineralization associated with carbonatite-alkaline complexes in the southern Qinling orogenic belt, Central China
  21. Potassium isotope fractionation during silicate-carbonatite melt immiscibility and phlogopite fractional crystallization
  22. Yuchuanite-(Y), Y2(CO3)3·H3O, a new hydrous yttrium carbonate mineral from the Yushui Cu deposit, South China
  23. Nature and timing of Sn mineralization in southern Hunan, South China: Constraints from LA-ICP-MS cassiterite U-Pb geochronology and trace element composition
  24. A simple method for obtaining heat capacity coefficients of minerals
  25. Letter
  26. Molybdenum isotopic fractionation in the Panzhihua mafic layered intrusion in the Emeishan large igneous province, southwest China
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