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The effect of oxo-component on the high-pressure behavior of amphiboles

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Published/Copyright: April 2, 2015
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American Mineralogist
From the journal American Mineralogist Volume 95 Issue 7

Abstract

The role of the oxo-component on the compressibility of amphibole was studied by means of highpressure in situ single-crystal X-ray diffraction on two natural kaersutite megacrysts (samples DL5 and FR12) from alkaline basalts. The oxo-component varies significantly (1.1 and 1.9 apfu in DL5 and FR12, respectively), whereas the cation composition is very similar, apart from the Fe3+/(Fe2++Fe3+), which is 0.33 in DL5 and ~1 in FR12. The larger oxo-component of FR12 is attributed to the Fe2+ + OH- = Fe3+ + O2- + ½H2 substitution.

Unit-cell parameters were collected at different pressures up to about 8 GPa. Structural refinements of both samples were performed with data collected at different P up to 6 GPa. Fitting the P-V data to a third-order Birch Murnaghan EoS yielded the following parameters: K0 = 94(1) GPa, K′ = 6.3(4), and V0 = 903.6(2) Å3 for FR12 and K0 = 91(2) GPa, K′ = 6.2(4), and V0 = 914.1(2) Å3 for DL5. The axial moduli of the two amphibole samples were: K0a = 86(3) GPa, K′a = 7(1), and a0 = 9.815(2) Å; K0b = 115(3) GPa, K′b = 4.8(8), and b0 = 18.012(2) Å; K0c = 112(5) GPa, K″c = 7(1), and c0 = 5.300(1) Å for sample FR12 and K0a = 85(3) GPa, K′a = 5(1), and a0 = 9.8660(9) Å; K0b = 113(2), K′b = 4.4(6), and b0 = 18.0548(6) Å; K0c = 107(3) GPa, K′c = 7(1), and c0 = 5.3185(5) Å for sample DL5. This suggests that the compressibility of kaersutite decreases with increasing oxo-component.

Structural refinements show that the polyhedral compressibility follows the order A = M4 > M2 > M3 > M1 for DL5 and A = M4 > M2 > M1 > M3 for FR12. The most evident geometrical effect induced by P is the decrease in the bending of the double tetrahedral chain, when adjacent I-beams are pushed against each other. This effect is largest for DL5, which has a larger concavity of the A site, (O7-O7′ changes from 3.03 to 2.82 Å) compared to the one of FR12, (O7-O7′ changes from 2.92 to 2.79 Å). This mechanism is confirmed by the evolution of T1-O7-T1 angle (from 135.4° to 132.5° in FR12 and from 136.6° to 132.2° in DL5).

Keywords: Oxo-amphiboles; kaersutite; compressibility; equation of state; high-pressure structure; amphibole
Received: 2009-10-14
Accepted: 2010-2-16
Published Online: 2015-4-2
Published in Print: 2010-7-1

© 2015 by Walter de Gruyter Berlin/Boston

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  26. Letter. A first-principles determination of the orientation of H3O+ in hydronium alunite
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https://doi.org/10.2138/am.2010.3429
Keywords for this article
Oxo-amphiboles; kaersutite; compressibility; equation of state; high-pressure structure; amphibole

Articles in the same Issue

  1. Corundum–leucosome-bearing aluminous gneiss from Ayyarmalai, Southern Granulite Terrain, India: A textbook example of vapor phase-absent muscovite-melting in silica-undersaturated aluminous rocks
  2. Near infrared spectra of white mica in the Belt Supergroup and implications for metamorphism
  3. Arsenic speciation in fluid inclusions using micro-beam X-ray absorption spectroscopy
  4. The crystal chemistry and crystal structure of kuksite, Pb3Zn3Te6+P2O14, and a note on the crystal structure of yafsoanite, (Ca,Pb)3Zn(TeO6)2
  5. Chabazite-Mg: a new natural zeolite of the chabazite series
  6. Solution calorimetric investigation of fluor-chlorapatite crystalline solutions
  7. Pertsevite-(OH), a new mineral in the pertsevite series, Mg2(BO3)1–x(SiO4)x(F,OH)1–x (x < 0.5), from the Snezhnoye deposit in Sakha-Yakutia Republic, Russia
  8. Bitikleite-(SnAl) and bitikleite-(ZrFe): New garnets from xenoliths of the Upper Chegem volcanic structure, Kabardino-Balkaria, Northern Caucasus, Russia
  9. Silicon coordination in rutile and TiO2-II at ambient and high pressures: Si-29 NMR
  10. Spin orientation in a natural Ti-bearing hematite: Evidence for an out-of-plane component
  11. Theoretical determination of the Raman spectra of single-crystal forsterite (Mg2SiO4)
  12. Nitrogen and hydrogen isotope compositions and solubility in silicate melts in equilibrium with reduced (N+H)-bearing fluids at high pressure and temperature: Effects of melt structure
  13. In situ ultrasonic velocity measurements across the olivine-spinel transformation in Fe2SiO4
  14. The computation of equilibrium assemblage diagrams with Theriak/Domino software
  15. Determination of nanoparticulate magnetite stoichiometry by Mössbauer spectroscopy, acidic dissolution, and powder X-ray diffraction: A critical review
  16. Low-temperature behavior of natural kalsilite with P31c symmetry: An in situ single-crystal X-ray diffraction study
  17. First-principles simulations of MgO tilt grain boundary: Structure and vacancy formation at high pressure
  18. The effect of oxo-component on the high-pressure behavior of amphiboles
  19. Integral molar absorptivities of OH in muscovite at 20 to 650 °C by in-situ high-temperature IR microspectroscopy
  20. Principles of thermal expansion in the feldspar system
  21. A moissanite cell apparatus for optical in situ observation of crystallizing melts at high temperature
  22. Polezhaevaite-(Ce), NaSrCeF6, a new mineral from the Khibiny massif (Kola Peninsula, Russia)
  23. The interlayer structure of trioctahedral lithian micas: An AXANES spectroscopy study at the potassium K-edge
  24. Amorphous Materials: Properties, Structure, and Durability. Arsenic enrichment in hydrous peraluminous melts: Insights from femtosecond laser ablation-inductively coupled plasma-quadrupole mass spectrometry, and in situ X-ray absorption fine structure spectroscopy
  25. Letter. Partial high-grade alteration of monazite using alkali-bearing fluids: Experiment and nature
  26. Letter. A first-principles determination of the orientation of H3O+ in hydronium alunite
  27. Letter. The structure of a super-aluminous version of the dense hydrous-magnesium silicate phase D
  28. Letter. Kaolin polytypes revisited ab initio at 10 GPa
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