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Experimental study on the kinetics of magnesiohornblende dehydration and its implications

  • Kenan Han ORCID logo , Li Yi , Duojun Wang , Ruixin Zhang and Peng Chen ORCID logo
Published/Copyright: March 11, 2024
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American Mineralogist
From the journal American Mineralogist Volume 109 Issue 3

Abstract

Magnesiohornblende dehydration was studied using both high-temperature thermogravimetric analysis and high-pressure diferential thermal analysis (HP-DTA). The high-temperature thermogravimetric analysis results revealed that magnesiohornblende dehydration at high temperatures could be divided into three steps: 848–1058, 1058–1243, and 1243–1473 K, and each step followed an n-order reaction (Fn). The dehydration process is characterized by an oxidation-dehydrogenation mechanism, and the dehydration of the last step can be explained as the direct decomposition of the hydroxyl groups connected to the magnesium ions. The HP-DTA of magnesiohornblende dehydration under pressures of 0.5, 1.0, 2.0, and 3.0 GPa revealed the occurrence of two endothermic peaks, indicating that the dehydration occurs in two steps at high temperature and pressure. Our experimental results reveal that during subduction, the fluid released during the dehydration of magnesiohornblende may trigger earthquakes and cause high electrical conductivity anomalies in the subduction zones.

Keywords: Magnesiohornblende; dehydration; thermogravimetric analysis; high-pressure differential thermal analysis (HP-DTA); subduction zones

Acknowledgments and Funding

We thank Junjie Dong and an anonymous reviewer for their constructive reviews. This research was supported by the Natural Science Foundation of China (NSFC) Major Research Plan on West-Pacific Earth System Multispheric Interactions (project number: 91958216), NSFC(project number: 41874104), and the Fundamental Research Funds for the Central Universities.

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Received: 2022-07-05
Accepted: 2023-04-03
Published Online: 2024-03-11
Published in Print: 2024-03-25

© 2024 by Mineralogical Society of America

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
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  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
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https://doi.org/10.2138/am-2022-8692
Keywords for this article
Magnesiohornblende; dehydration; thermogravimetric analysis; high-pressure differential thermal analysis (HP-DTA); subduction zones

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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