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Crystal chemistry and origin of grandidierite, ominelite, boralsilite, and werdingite from the Bory Granulite Massif, Czech Republic

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Published/Copyright: April 2, 2015
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American Mineralogist
From the journal American Mineralogist Volume 95 Issue 10

Abstract

A mineral assemblage involving grandidierite, ominelite, boralsilite, werdingite, dumortierite (locally Sb,Ti-rich), tourmaline, and corundum, along with the matrix minerals K-feldspar, quartz, and plagioclase, was found in a veinlet cutting leucocratic granulite at Horní Bory, Bory Granulite Massif, Moldanubian Zone of the Bohemian Massif. Zoned crystals of primary grandidierite to ominelite enclosed in quartz are locally overgrown by prismatic crystals of boralsilite and Fe-rich werdingite. Boralsilite also occurs as separate cross-shaped plumose aggregates with Fe-rich werdingite in quartz. Grandidierite is commonly rimmed by a narrow zone of secondary tourmaline or is partially replaced by the assemblage tourmaline + corundum ± hercynite. Grandidierite (XFe = 0.34-0.71) exhibits dominant FeMg-1 substitution and elevated contents of Li (120-1890 ppm). Boralsilite formula ranges from Al15.97B6.20Si1.80O37 to Al15.65B5.29Si2.71O37 and the formula of werdingite ranges from (Fe,Mg)1.44Al14.61B4.00Si3.80O37 to (Fe,Mg)1.22Al14.86B4.25Si3.55O37. Dumortierite and Sb,Ti-rich dumortierite occur as zoned crystals with zones poor in minor elements (≤0.12 apfu Fe+Mg) and zones enriched in Sb (≤0.46 apfu) and Ti (≤0.25 apfu). Secondary tourmaline (XFe = 0.44-0.75) of the schorlmagnesiofotite- foitite-olenite solid solution occurs as a replacement product of grandidierite, rarely boralsilite. Other accessory minerals in the veinlet include monazite-(Ce), ilmenite, rutile, ferberite, srilankite, löllingite, arsenopyrite, and apatite. Formation of the borosilicate-bearing veinlet post-dates the development of foliation in the host granulite and is related to the decompressional process. The assemblage most probably originated from a H2O-poor system at T ~ 750 °C and P ~ 6-8 kbar. Textural relations as well as geological position of the borosilicate veinlet suggest that it represents the earliest intrusion related to pegmatites in the Bory Granulite Massif. Younger granitic pegmatites in the area are characterized by high contents of B, Al, P, Fe, and minor concentrations of W, Ti, Zr, Sc, and Sb. All pegmatite types probably formed within a short time period of ~5 Ma.

Keywords: Boron; grandidierite; ominelite; werdingite; boralsilite; granulite; partial melting; Moldanubicum; Bohemian Massif
Received: 2009-12-18
Accepted: 2010-6-14
Published Online: 2015-4-2
Published in Print: 2010-10-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Ti-Al zoning of experimentally grown titanite in the system CaO-Al2O3-TiO2-SiO2-NaCl-H2O-(F): Evidence for small-scale fluid heterogeneity
  2. A new method for quantitative petrography based on image processing of chemical element maps: Part I. Mineral mapping applied to compacted bentonites
  3. A new method for quantitative petrography based on image processing of chemical element maps: Part II. Semi-quantitative porosity maps superimposed on mineral maps
  4. Enhancement of solid-state reaction rates by non-hydrostatic stress effects on polycrystalline diffusion kinetics
  5. (H3O)Fe(SO4)2 formed by dehydrating rhomboclase and its potential existence on Mars
  6. Crystal chemistry and low-temperature behavior of datolite: A single-crystal X-ray diffraction study
  7. Density and seismic velocities of chromitite body in oceanic mantle peridotite
  8. Packing schemes of cavities in selected clathrasils and zeolites and the analogous packings of atoms in crystal structures
  9. Temperature dependence of IR absorption of OH species in clinopyroxene
  10. Thermal behavior of vibrational phonons and hydroxyls of muscovite in dehydroxylation: In situ high-temperature infrared spectroscopic investigations
  11. Kinetics of Fe-oxidation/deprotonation process in Fe-rich phlogopite under isothermal conditions
  12. On the crystal chemistry of londonite [(Cs,K,Rb)Al4Be5B11O28]: A single-crystal neutron diffraction study at 300 and 20 K
  13. High-pressure melting of wüstite
  14. Primary Nb-Ta minerals in the Szklary pegmatite, Poland: New insights into controls of crystal chemistry and crystallization sequences
  15. Evolution of the interlayer space of hydrated montmorillonite as a function of temperature
  16. Morphology of pyrite in particulate matter from shallow submarine hydrothermal vents
  17. Influence of the fluid composition on diamond dissolution forms in carbonate melts
  18. Far infrared spectroscopy of carbonate minerals
  19. Assessment of the diamond-trap method for studying high-pressure fluids and melts and an improved freezing stage design for laser ablation ICP-MS analysis
  20. Françoisite-(Ce), a new mineral species from La Creusaz uranium deposit (Valais, Switzerland) and from Radium Ridge (Flinders Ranges, South Australia): Description and genesis
  21. Crystal chemistry and origin of grandidierite, ominelite, boralsilite, and werdingite from the Bory Granulite Massif, Czech Republic
  22. Lead-tellurium oxysalts from Otto Mountain near Baker, California: III. Thorneite, Pb6(Te26+O10)(CO3)Cl2(H2O), the first mineral with edge-sharing octahedral tellurate dimers
  23. Lead-tellurium oxysalts from Otto Mountain near Baker, California: IV. Markcooperite, Pb(UO2)Te6+O6, the first natural uranyl tellurate
  24. Lead-tellurium oxysalts from Otto Mountain near Baker, California: V. Timroseite, Pb2Cu52+(Te6+O6)2(OH)2, and paratimroseite, Pb2Cu42+(Te6+O6)2(H2O)2, two new tellurates with Te-Cu polyhedral sheets
  25. Lead-tellurium oxysalts from Otto Mountain near Baker, California: VI. Telluroperite, Pb3Te4+O4Cl2, the Te analog of perite and nadorite
  26. The determination of sulfate and sulfide species in hydrous silicate glasses using Raman spectroscopy
  27. The structure of crystals, glasses, and melts along the CaO-Al2O3 join: Results from Raman, Al L- and K-edge X-ray absorption, and 27Al NMR spectroscopy
  28. Ordering of iron vacancies in monoclinic jarosites
https://doi.org/10.2138/am.2010.3480
Keywords for this article
Boron; grandidierite; ominelite; werdingite; boralsilite; granulite; partial melting; Moldanubicum; Bohemian Massif

Articles in the same Issue

  1. Ti-Al zoning of experimentally grown titanite in the system CaO-Al2O3-TiO2-SiO2-NaCl-H2O-(F): Evidence for small-scale fluid heterogeneity
  2. A new method for quantitative petrography based on image processing of chemical element maps: Part I. Mineral mapping applied to compacted bentonites
  3. A new method for quantitative petrography based on image processing of chemical element maps: Part II. Semi-quantitative porosity maps superimposed on mineral maps
  4. Enhancement of solid-state reaction rates by non-hydrostatic stress effects on polycrystalline diffusion kinetics
  5. (H3O)Fe(SO4)2 formed by dehydrating rhomboclase and its potential existence on Mars
  6. Crystal chemistry and low-temperature behavior of datolite: A single-crystal X-ray diffraction study
  7. Density and seismic velocities of chromitite body in oceanic mantle peridotite
  8. Packing schemes of cavities in selected clathrasils and zeolites and the analogous packings of atoms in crystal structures
  9. Temperature dependence of IR absorption of OH species in clinopyroxene
  10. Thermal behavior of vibrational phonons and hydroxyls of muscovite in dehydroxylation: In situ high-temperature infrared spectroscopic investigations
  11. Kinetics of Fe-oxidation/deprotonation process in Fe-rich phlogopite under isothermal conditions
  12. On the crystal chemistry of londonite [(Cs,K,Rb)Al4Be5B11O28]: A single-crystal neutron diffraction study at 300 and 20 K
  13. High-pressure melting of wüstite
  14. Primary Nb-Ta minerals in the Szklary pegmatite, Poland: New insights into controls of crystal chemistry and crystallization sequences
  15. Evolution of the interlayer space of hydrated montmorillonite as a function of temperature
  16. Morphology of pyrite in particulate matter from shallow submarine hydrothermal vents
  17. Influence of the fluid composition on diamond dissolution forms in carbonate melts
  18. Far infrared spectroscopy of carbonate minerals
  19. Assessment of the diamond-trap method for studying high-pressure fluids and melts and an improved freezing stage design for laser ablation ICP-MS analysis
  20. Françoisite-(Ce), a new mineral species from La Creusaz uranium deposit (Valais, Switzerland) and from Radium Ridge (Flinders Ranges, South Australia): Description and genesis
  21. Crystal chemistry and origin of grandidierite, ominelite, boralsilite, and werdingite from the Bory Granulite Massif, Czech Republic
  22. Lead-tellurium oxysalts from Otto Mountain near Baker, California: III. Thorneite, Pb6(Te26+O10)(CO3)Cl2(H2O), the first mineral with edge-sharing octahedral tellurate dimers
  23. Lead-tellurium oxysalts from Otto Mountain near Baker, California: IV. Markcooperite, Pb(UO2)Te6+O6, the first natural uranyl tellurate
  24. Lead-tellurium oxysalts from Otto Mountain near Baker, California: V. Timroseite, Pb2Cu52+(Te6+O6)2(OH)2, and paratimroseite, Pb2Cu42+(Te6+O6)2(H2O)2, two new tellurates with Te-Cu polyhedral sheets
  25. Lead-tellurium oxysalts from Otto Mountain near Baker, California: VI. Telluroperite, Pb3Te4+O4Cl2, the Te analog of perite and nadorite
  26. The determination of sulfate and sulfide species in hydrous silicate glasses using Raman spectroscopy
  27. The structure of crystals, glasses, and melts along the CaO-Al2O3 join: Results from Raman, Al L- and K-edge X-ray absorption, and 27Al NMR spectroscopy
  28. Ordering of iron vacancies in monoclinic jarosites
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