Startseite Orthovanadate wakefieldite-(Ce) in symplectites replacing vanadium-bearing omphacite in the ultra-oxidized manganese deposit of Praborna (Aosta Valley, Western Italian Alps)
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Orthovanadate wakefieldite-(Ce) in symplectites replacing vanadium-bearing omphacite in the ultra-oxidized manganese deposit of Praborna (Aosta Valley, Western Italian Alps)

  • Simone Tumiati ORCID logo EMAIL logo , Marco Merlini , Gaston Godard , Michael Hanfland und Patrizia Fumagalli ORCID logo
Veröffentlicht/Copyright: 11. August 2020
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 105 Heft 8

Abstract

Because of their unique structure and properties, rare-earth (REE) orthovanadates have been extensively employed for decades in advanced ceramics, in particular in the laser industry in replacement of Nd: YAG. A Ca-bearing REE orthovanadate with the empirical formula (Ce0.279Ca0.271Y0.267Gd0.057 Nd0.055Dy0.032Sm0.027La0.020Th0.027Sr0.002)(V0.9085+Cr0.0673+Fe0.0173+As0.0055+)O4⋅nH2Ohas been found in metacherts from Praborna (Italian Alps) as micrometer-sized euhedral crystals in clinopyroxene + plagioclase symplectites replacing eclogite-facies vanadium-bearing omphacite (Aegirine55–48Jadeite42–33Diopside10–8 with V2O3 ≤ 1.39 wt%). We applied the synchrotron radiation, single crystal, micro-diffraction technique, recently optimized at ID09A beamline (ESRF, France), to determine the crystal structure of this mineral. It is tetragonal and isostructural with zircon, with a = 7.2233(12) Å, c = 6.3949(18) Å, V = 333.66(13) Å3, Z = 4, space group I41/amd, and it has been therefore identified as Ca- and Y-bearing wakefieldite-(Ce) (ideally CeV5+O4). Cell parameters are in agreement with those of synthetic Ce0.7Ca0.3VO4. Raman spectra of the studied wakefieldite-(Ce) are comparable with natural and synthetic wakefieldite-(Ce) spectra and revealed the presence of OH groups and/or water of hydration, which is also suggested by the low totals in microprobe analyses. Mass balance indicates that wakefieldite-(Ce) is a by-product of the omphacite breakdown; omphacite and Mn-rich epidote, a minor reactant, provided vanadium and REE, respectively. Petrological observations and thermodynamic modeling suggest that the mineral, coexisting with hematite, Mn-rich epidote, and braunite, formed during retrogression to greenschist-facies conditions at ultra-oxidized conditions (ᐃFMQ ≥ +16 log units), which are often observed in Mn-oxide ores. Wakefieldite is an efective scavenger of REE in oxidized geological environments at P-T conditions that range from sedimentary to medium-grade metamorphic settings, even where the REE bulk concentration is negligible. Its rarity reflects both the overall low abundance of vanadium and the need for ultra-oxidized conditions that are rarely achieved in metamorphic rocks, where REE phosphates (i.e., monazite, xenotime) are commonly found instead.

Keywords: Vanadate; wakefieldite; manganese; Alps

Acknowledgments

M. Fialin at an early stage of the study and A. Risplendente are acknowledged for their help at the electron microprobes of Paris and Milan, respectively. E. Perseil is thanked for donating sample SM96-2 to S.T. The authors are indebted to two anonymous reviewers for their useful suggestions. Suggestions by the Associate Editor Jennifer Kung also contributed to a significant improvement of the paper.

  1. Funding

    Italian Ministry of Education, Universities and Research (MIUR)—Excellent Departments Project.

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Received: 2019-07-19
Accepted: 2020-01-29
Published Online: 2020-08-11
Published in Print: 2020-08-26

© 2020 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Outlooks in Earth and Planetary Materials
  2. Are quasicrystals really so rare in the Universe?
  3. Reaction between Cu-bearing minerals and hydrothermal fluids at 800 °C and 200 MPa: Constraints from synthetic fluid inclusions
  4. Evaluation and application of the quartz-inclusions-in-epidote mineral barometer
  5. Let there be water: How hydration/dehydration reactions accompany key Earth and life processes
  6. Origin of corundum within anorthite megacrysts from anorthositic amphibolites,Granulite Terrane, Southern India
  7. Raman spectroscopy study of manganese oxides: Tunnel structures
  8. Experimental constraints on the partial melting of sediment-metasomatized lithospheric mantle in subduction zones
  9. Interlayer energy of pyrophyllite: Implications for macroscopic friction
  10. Thermodynamic and thermoelastic properties of wurtzite-ZnS by density functional theory
  11. The nature of Zn-phyllosilicates in the nonsulfide Mina Grande and Cristal zinc deposits (Bongará District, Northern Peru): The TEM-HRTEM and AEM perspective
  12. Orthovanadate wakefieldite-(Ce) in symplectites replacing vanadium-bearing omphacite in the ultra-oxidized manganese deposit of Praborna (Aosta Valley, Western Italian Alps)
  13. A simple and effective capsule sealing technique for hydrothermal experiments
  14. Metamorphic amphiboles in the Ironwood Iron-Formation, Gogebic Iron Range, Wisconsin: Implications for potential resource development
  15. Letter
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  17. New Mineral Names
https://doi.org/10.2138/am-2020-7219
Schlagwörter für diesen Artikel
Vanadate; wakefieldite; manganese; Alps

Artikel in diesem Heft

  1. Outlooks in Earth and Planetary Materials
  2. Are quasicrystals really so rare in the Universe?
  3. Reaction between Cu-bearing minerals and hydrothermal fluids at 800 °C and 200 MPa: Constraints from synthetic fluid inclusions
  4. Evaluation and application of the quartz-inclusions-in-epidote mineral barometer
  5. Let there be water: How hydration/dehydration reactions accompany key Earth and life processes
  6. Origin of corundum within anorthite megacrysts from anorthositic amphibolites,Granulite Terrane, Southern India
  7. Raman spectroscopy study of manganese oxides: Tunnel structures
  8. Experimental constraints on the partial melting of sediment-metasomatized lithospheric mantle in subduction zones
  9. Interlayer energy of pyrophyllite: Implications for macroscopic friction
  10. Thermodynamic and thermoelastic properties of wurtzite-ZnS by density functional theory
  11. The nature of Zn-phyllosilicates in the nonsulfide Mina Grande and Cristal zinc deposits (Bongará District, Northern Peru): The TEM-HRTEM and AEM perspective
  12. Orthovanadate wakefieldite-(Ce) in symplectites replacing vanadium-bearing omphacite in the ultra-oxidized manganese deposit of Praborna (Aosta Valley, Western Italian Alps)
  13. A simple and effective capsule sealing technique for hydrothermal experiments
  14. Metamorphic amphiboles in the Ironwood Iron-Formation, Gogebic Iron Range, Wisconsin: Implications for potential resource development
  15. Letter
  16. The chlorine-isotopic composition of lunar KREEP from magnesian-suite troctolite 76535
  17. New Mineral Names
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