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Experimental incorporation of Th into xenotime at middle to lower crustal P-T utilizing alkali-bearing fluids

  • Daniel E. Harlov EMAIL logo and Richard Wirth
Published/Copyright: April 2, 2015
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American Mineralogist
From the journal American Mineralogist Volume 97 Issue 4

Abstract

In this study, a natural Th-absent xenotime [(Y+HREE)PO4], is enriched in specific areas with respect to Th + Si utilizing a series of alkali-bearing fluids that included 2 N NaOH, 2 N KOH, Na2Si2O5 + H2O, and NaF + H2O, in addition to ThO2 and SiO2. Charge and fluid were sealed in Au capsules and placed in the piston-cylinder apparatus (CaF2 assemblies) at 1000 MPa and 900 °C (8 to 25 days) or in cold-seal autoclaves on a hydrothermal line at 500 MPa and 600 °C (23 days). BSE imaging, EMP analysis, and TEM indicate that a fraction of the xenotime grains in the 2 N KOH, Na2Si2O5 + H2O, and NaF + H2O experiments have altered areas enriched in Th + Si. No reaction was observed in the 2 N NaOH experiments. The altered areas occur as a series of curvilinear intergrowths with sharp compositional boundaries that extend from the edge of the xenotime grain into the interior. Formation of these Th + Si enriched areas is interpreted as a consequence of fluid-mediated coupled dissolution-reprecipitation.

Keywords: Xenotime; thorite; coupled dissolution-reprecipitation; alkali-bearing fluids
Received: 2011-4-22
Accepted: 2012-1-2
Published Online: 2015-4-2
Published in Print: 2012-4-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Veatchite: Structural relationships of the three polytypes
  2. Falsterite, Ca2MgMn2+2 (Fe2+0.5Fe3+0.5)4Zn4(PO4)8(OH)4(H2O)14, a new secondary phosphate mineral from the Palermo No. 1 pegmatite, North Groton, New Hampshire
  3. Pavlovskyite Ca8(SiO4)2(Si3O10): A new mineral of altered silicate-carbonate xenoliths from the two Russian type localities, Birkhin massif, Baikal Lake area and Upper Chegem caldera, North Caucasus
  4. Zaccagnaite-3R, a new Zn-Al hydrotalcite polytype from El Soplao cave (Cantabria, Spain)
  5. Incorporation of Si into TiO2 phases at high pressure
  6. TOF-SIMS and electron microprobe investigations of zoned magmatic orthopyroxenes: First results of trace and minor element analysis with implications for diffusion modeling
  7. Titanium in muscovite, biotite, and hornblende: Modeling, thermometry, and rutile activities of metapelites and amphibolites
  8. Polysaccharide-catalyzed nucleation and growth of disordered dolomite: A potential precursor of sedimentary dolomite
  9. High-pressure and high-temperature phase transitions in FeTiO3 and a new dense FeTi3O7 structure
  10. Compressibility and thermal expansion of hydrous ringwoodite with 2.5(3) wt% H2O
  11. Vibrational and elastic properties of ferromagnesite across the electronic spin-pairing transition of iron
  12. Electronic spin states of ferric and ferrous iron in the lower-mantle silicate perovskite
  13. Experimental VNIR reflectance spectroscopy of gypsum dehydration: Investigating the gypsum to bassanite transition
  14. Nature of rehydroxylation in dioctahedral 2:1 layer clay minerals
  15. Thermal behavior of afghanite, an ABABACAC member of the cancrinite group
  16. Experimental incorporation of Th into xenotime at middle to lower crustal P-T utilizing alkali-bearing fluids
  17. Sol-gel synthesis of nanocrystalline fayalite (Fe2SiO4)
  18. The heat capacity of fayalite at high temperatures
  19. Structural trends for celestite (SrSO4), anglesite (PbSO4), and barite (BaSO4): Confirmation of expected variations within the SO4 groups
  20. The dehydroxylation of serpentine group minerals
  21. Formation of nanoscale Th-coffinite
  22. Magnetic and low-temperature structural behavior of clinopyroxene-type FeGeO3: A neutron diffraction, magnetic susceptibility, and 57Fe Mössbauer study
  23. Crystal structure and thermal expansion of aragonite-group carbonates by single-crystal X-ray diffraction
  24. The lower-pressure stability of glaucophane in the presence of paragonite and quartz in the system Na2O-MgO-Al2O3-SiO2-H2O
  25. Coralloite, Mn2+Mn23+(AsO4)2(OH)2·4H2O, a new mixed valence Mn hydrate arsenate: Crystal structure and relationships with bermanite and whitmoreite mineral groups
  26. The crystal structure of metanatroautunite, Na[(UO2)(PO4)](H2O)3, from the Lake Boga Granite, Victoria, Australia
  27. Petedunnite (CaZnSi2O6): Stability and phase relations in the system CaO-ZnO-SiO2
  28. Revision of the crystal structure and chemical formula of weeksite, K2(UO2)2(Si5O13)·4H2O
  29. Electron backscatter diffraction (EBSD) analyses of phyllosilicates in petrographic thin sections
https://doi.org/10.2138/am.2012.3865
Keywords for this article
Xenotime; thorite; coupled dissolution-reprecipitation; alkali-bearing fluids

Articles in the same Issue

  1. Veatchite: Structural relationships of the three polytypes
  2. Falsterite, Ca2MgMn2+2 (Fe2+0.5Fe3+0.5)4Zn4(PO4)8(OH)4(H2O)14, a new secondary phosphate mineral from the Palermo No. 1 pegmatite, North Groton, New Hampshire
  3. Pavlovskyite Ca8(SiO4)2(Si3O10): A new mineral of altered silicate-carbonate xenoliths from the two Russian type localities, Birkhin massif, Baikal Lake area and Upper Chegem caldera, North Caucasus
  4. Zaccagnaite-3R, a new Zn-Al hydrotalcite polytype from El Soplao cave (Cantabria, Spain)
  5. Incorporation of Si into TiO2 phases at high pressure
  6. TOF-SIMS and electron microprobe investigations of zoned magmatic orthopyroxenes: First results of trace and minor element analysis with implications for diffusion modeling
  7. Titanium in muscovite, biotite, and hornblende: Modeling, thermometry, and rutile activities of metapelites and amphibolites
  8. Polysaccharide-catalyzed nucleation and growth of disordered dolomite: A potential precursor of sedimentary dolomite
  9. High-pressure and high-temperature phase transitions in FeTiO3 and a new dense FeTi3O7 structure
  10. Compressibility and thermal expansion of hydrous ringwoodite with 2.5(3) wt% H2O
  11. Vibrational and elastic properties of ferromagnesite across the electronic spin-pairing transition of iron
  12. Electronic spin states of ferric and ferrous iron in the lower-mantle silicate perovskite
  13. Experimental VNIR reflectance spectroscopy of gypsum dehydration: Investigating the gypsum to bassanite transition
  14. Nature of rehydroxylation in dioctahedral 2:1 layer clay minerals
  15. Thermal behavior of afghanite, an ABABACAC member of the cancrinite group
  16. Experimental incorporation of Th into xenotime at middle to lower crustal P-T utilizing alkali-bearing fluids
  17. Sol-gel synthesis of nanocrystalline fayalite (Fe2SiO4)
  18. The heat capacity of fayalite at high temperatures
  19. Structural trends for celestite (SrSO4), anglesite (PbSO4), and barite (BaSO4): Confirmation of expected variations within the SO4 groups
  20. The dehydroxylation of serpentine group minerals
  21. Formation of nanoscale Th-coffinite
  22. Magnetic and low-temperature structural behavior of clinopyroxene-type FeGeO3: A neutron diffraction, magnetic susceptibility, and 57Fe Mössbauer study
  23. Crystal structure and thermal expansion of aragonite-group carbonates by single-crystal X-ray diffraction
  24. The lower-pressure stability of glaucophane in the presence of paragonite and quartz in the system Na2O-MgO-Al2O3-SiO2-H2O
  25. Coralloite, Mn2+Mn23+(AsO4)2(OH)2·4H2O, a new mixed valence Mn hydrate arsenate: Crystal structure and relationships with bermanite and whitmoreite mineral groups
  26. The crystal structure of metanatroautunite, Na[(UO2)(PO4)](H2O)3, from the Lake Boga Granite, Victoria, Australia
  27. Petedunnite (CaZnSi2O6): Stability and phase relations in the system CaO-ZnO-SiO2
  28. Revision of the crystal structure and chemical formula of weeksite, K2(UO2)2(Si5O13)·4H2O
  29. Electron backscatter diffraction (EBSD) analyses of phyllosilicates in petrographic thin sections
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