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Fluorine behavior during experimental muscovite dehydration melting and natural partitioning between micas: Implications for the petrogenesis of peraluminous leucogranites and pegmatites

  • Ricardo Sallet , Jonathan D. Price , Carlos Ribeiro ORCID logo , Maria Helena B.M. Hollanda , Isaac J. Sayeg and Daniel Harlov
Published/Copyright: July 10, 2023
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American Mineralogist
From the journal American Mineralogist Volume 108 Issue 7

Abstract

Fluorine behavior during the partial melting of two mica-bearing protoliths has been experimentally investigated at 700 to 930 °C and 0.4 and 0.6 GPa. Muscovite dehydration and H2O-HF fluid-assisted partial-melting experiments were carried out using both a natural and synthetic two-mica schist made of natural micas. The mineral composition of the experiments was assessed by BSE imaging and EDS analyses. The F, Cl, and major elements contents of the glass and micas were determined by EPMA.

The muscovite dehydration melting reaction is muscovite + quartz + plagioclase = peraluminous melt + biotite + sillimanite + potassic feldspar ± hercynite. The starting biotite stays largely stable, showing only minor melt + ilmenite and trace magnetite formation in the cleavages. The newly formed biotite shows similar F contents and a slightly higher XSid component when compared to the starting biotite. HF-added experiments yield F-rich newly formed biotite.

The experimentally produced melts were of a peraluminous leucogranitic composition with F contents increasing with F-rich protoliths. The bulk partition coefficient D F schist/mel  increases from 0.5 to 3.0 when the F content of the protolith rises from 0.05 to 1.2 wt%. The partition coefficient, D F B t / m e l t , increases from 2.0 to 6.0 where the biotite MgO content increases from 5 to 18 wt%. The natural partition coefficient D F B t / M s , measured for a set of rocks with a varied lithology from the Seridó Belt, northeastern Brazil, was 2.7 ± 0.5.

The F partition coefficients measured in this study, along with published F partition coefficients between biotite and melt, biotite and muscovite, and fluid and melt, allow for the modeling of F behavior during muscovite dehydration and fluid-present melting. F-rich, two-mica protoliths will increase F partitioning in favor of the micaceous anatectic residue compared to the peraluminous melt. Furthermore, the model indicates that the more Fe-rich the schist and its residual biotite are, the higher the F content of the melt and the fluid. Fluorine-rich peraluminous leucogranites and related fluids may be generated by the anatexis of F- and Fe-rich, two-mica protoliths. As F can be a complexing ligand for Li, Be, Cs, Nb, Ta, W, Sn, and U, muscovite dehydration could potentially be associated with metallic occurrences associated with peraluminous melts.

Keywords: Anatexis; peraluminous leucogranite; micas; fluid; fluorine partition; Experimental Halogens in Honor of Jim Webster

Funding statement: National Science Foundation EAR-0635858 is acknowledged for support of some of the experiments in this study. M.H.H. is grateful to the Conselho Nacional de Desenvolvimento Científico e Tecnológico for the research fellowship 303201/2019-3.

Acknowledgments

R.S. and J.P. thank Bruce Watson for encouragement, insights, and use of the experimental and analytical facilities at Rensselaer Polytechnic Institute, Troy, New York, U.S.A.; David Wark for EPMA calibration. R.S. thanks Robert Moritz for analytical facilities at the University of Geneva, Switzerland. We appreciated the careful editorial handling of Justin Filiberto and reviews from an anonymous reviewer and D. Foustoukos.

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Received: 2022-06-17
Accepted: 2022-08-26
Published Online: 2023-07-10
Published in Print: 2023-07-26

© 2023 by Mineralogical Society of America

Articles in the same Issue

  1. On the origin of fluorine-poor apatite in chondrite parent bodies
  2. Fluorine behavior during experimental muscovite dehydration melting and natural partitioning between micas: Implications for the petrogenesis of peraluminous leucogranites and pegmatites
  3. Telescoped boiling and cooling mechanisms triggered hydrothermal stibnite precipitation: Insights from the world’s largest antimony deposit in Xikuangshan China
  4. MSA Distinguished Lecturer Series Correlations between cathodoluminescence intensity and aluminum concentration in low-temperature hydrothermal quartz
  5. Behavior of hydrogen defect and framework of Fe-bearing wadsleyite and ringwoodite at high temperature and high pressure
  6. What is mineral informatics?
  7. Metal source and hydrothermal evolution of the Jiaoxi quartz vein-type tungsten deposit (Tibet): Insights from textural and compositional variations of wolframite and scheelite
  8. Geochemical processes and mechanisms for cesium enrichment in a hot-spring system
  9. Identifying xenocrystic tourmaline in Himalayan leucogranites
  10. Contrasting alteration textures and geochemistry of allanite from uranium-fertile and barren granites: Insights into granite-related U and ion-adsorption REE mineralization
  11. Feiite: Synthesis, stability, and implications for its formation conditions in nature
  12. Thermal equation of state of Fe3O4 magnetite up to 16 GPa and 1100 K
  13. UHP eclogite from western Dabie records evidence of polycyclic burial during continental subduction
  14. CO2 quantification in silicate glasses using μ-ATR FTIR spectroscopy
  15. Local structure determination of Zn-smectite
  16. A new UHP unit in the Western Alps: First occurrence of coesite from the Monviso Massif (Italy)
  17. Mineral evolution and mineral niches of ammonium sulfates: The case of Pastora mine, Aliseda, Spain
  18. Discrete late Jurassic Sn mineralizing events in the Xianghualing Ore District, South China: Constraints from cassiterite and garnet U-Pb geochronology
  19. Ryabchikovite, CuMg(Si2O6), a new pyroxene group mineral, and some genetic features of natural anhydrous copper silicates
https://doi.org/10.2138/am-2022-8663
Keywords for this article
Anatexis; peraluminous leucogranite; micas; fluid; fluorine partition; Experimental Halogens in Honor of Jim Webster

Articles in the same Issue

  1. On the origin of fluorine-poor apatite in chondrite parent bodies
  2. Fluorine behavior during experimental muscovite dehydration melting and natural partitioning between micas: Implications for the petrogenesis of peraluminous leucogranites and pegmatites
  3. Telescoped boiling and cooling mechanisms triggered hydrothermal stibnite precipitation: Insights from the world’s largest antimony deposit in Xikuangshan China
  4. MSA Distinguished Lecturer Series Correlations between cathodoluminescence intensity and aluminum concentration in low-temperature hydrothermal quartz
  5. Behavior of hydrogen defect and framework of Fe-bearing wadsleyite and ringwoodite at high temperature and high pressure
  6. What is mineral informatics?
  7. Metal source and hydrothermal evolution of the Jiaoxi quartz vein-type tungsten deposit (Tibet): Insights from textural and compositional variations of wolframite and scheelite
  8. Geochemical processes and mechanisms for cesium enrichment in a hot-spring system
  9. Identifying xenocrystic tourmaline in Himalayan leucogranites
  10. Contrasting alteration textures and geochemistry of allanite from uranium-fertile and barren granites: Insights into granite-related U and ion-adsorption REE mineralization
  11. Feiite: Synthesis, stability, and implications for its formation conditions in nature
  12. Thermal equation of state of Fe3O4 magnetite up to 16 GPa and 1100 K
  13. UHP eclogite from western Dabie records evidence of polycyclic burial during continental subduction
  14. CO2 quantification in silicate glasses using μ-ATR FTIR spectroscopy
  15. Local structure determination of Zn-smectite
  16. A new UHP unit in the Western Alps: First occurrence of coesite from the Monviso Massif (Italy)
  17. Mineral evolution and mineral niches of ammonium sulfates: The case of Pastora mine, Aliseda, Spain
  18. Discrete late Jurassic Sn mineralizing events in the Xianghualing Ore District, South China: Constraints from cassiterite and garnet U-Pb geochronology
  19. Ryabchikovite, CuMg(Si2O6), a new pyroxene group mineral, and some genetic features of natural anhydrous copper silicates
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