Article
Licensed
Unlicensed
Requires Authentication
FTIR spectroscopy of Ti-rich pargasites from Lherz and the detection of O2- at the anionic O3 site in amphiboles
-
Giancarlo Della Ventura
,
Roberta Oberti
Published/Copyright:
April 1, 2015
Abstract
This paper reports a single-crystal unpolarized-light FTIR study in the OH-stretching region of a suite of well-characterized Ti-rich pargasites from Lherz (French Pyrenees). All amphiboles studied have fairly constant M-site composition, with [6]Altot ~0.55 atoms per formula unit (apfu), [6]Ti ~0.45 apfu, and [6]Fe3+ ~0.40 apfu. SIMS and SREF data show all samples to have an O3 anion composition of OH ≈ O2- ≈ 1.0 apfu, with negligible F. The FTIR spectra show for all samples a broad absorption consisting of several overlapping bands; three main components can be recognized: ~3710, 3686, and 3660 cm-1, respectively, with an asymmetric tail extending to lower frequency. Six Gaussian components can be fitted to the spectra; comparison with spectra of both synthetic and natural pargasites allows five of these components to be assigned to local configurations involving OH-O2- at the O3 site, thus showing that coupling with an O2- anion through an A-cation significantly affects band position. Infrared spectroscopy can detect the presence of O2- in amphiboles in chemically favorable cases, i.e., in the absence of F. Moreover, the FTIR spectra show that all octahedral configurations involving M1Ti4+ or M1Fe3+M3Fe3+ are associated with O2- at both adjacent O3 sites, and that M3Al is locally associated with OH, confirming SRO models based on structure refinement results.
Keywords: Ti-rich pargasite; Lherz (French Pyrenees); single-crystal FTIR spectroscopy; anion occupancy
Received: 2005-12-22
Accepted: 2007-5-9
Published Online: 2015-4-1
Published in Print: 2007-10-1
© 2015 by Walter de Gruyter Berlin/Boston
You are currently not able to access this content.
You are currently not able to access this content.
Articles in the same Issue
- Ferric iron in Al-bearing akimotoite coexisting with iron-nickel metal in a shock-melt vein in an L-6 chondrite
- Solidification and microstructures of binary ice-I/hydrate eutectic aggregates
- A monazite oxygen isotope thermometer
- The albite fusion curve re-examined: New experiments and the high-pressure density and compressibility of high albite and NaAlSi3O8 liquid
- XRD and HRTEM analyses of stacking structures in sudoite, di-trioctahedral chlorite
- Vibrational dynamics in H+-substituted forsterite: A first-principles molecular dynamics study
- Fluorophlogopite from Biancavilla (Mt. Etna, Sicily, Italy): Crystal structure and crystal chemistry of a new F-dominant analog of phlogopite
- Pressure-induced over-hydration of thomsonite: A synchrotron powder diffraction study
- High-pressure optical spectroscopy and X-ray diffraction studies on synthetic cobalt aluminum silicate garnet
- In situ observation of the decomposition of kyanite at high pressures and high temperatures
- Mineralogy and crystal structure of bouazzerite from Bou Azzer, Anti-Atlas, Morocco: Bi-As-Fe nanoclusters containing Fe3+ in trigonal prismatic coordination
- Single-crystal structure refinement of diaspore at 50 GPa
- FTIR spectroscopy of Ti-rich pargasites from Lherz and the detection of O2- at the anionic O3 site in amphiboles
- The relative stability of monazite and huttonite at 300 - 900 °C and 200 - 1000 MPa: Metasomatism and the propagation of metastable mineral phases
- Acoustic dissipation associated with phase transitions in lawsonite, CaAl2Si2O7(OH)2·H2O
- Magnetic anisotropy of carbonate minerals at room temperature and 77 K
- Non-ideality and defectivity of the åkermanite-gehlenite solid solution: An X-ray diffraction and TEM study
- The system Al2O3-P2O5-H2O at temperatures below 200 °C: Experimental data on the stability of variscite and metavariscite AlPO4·2H2O
- Low-pressure decomposition of chrysotile as a function of time and temperature
- Ion exchange equilibrium and structural changes in clinoptilolite irradiated with β- and γ-radiation: Monovalent cations
- Investigation of dioctahedral smectite hydration properties by modeling of X-ray diffraction profiles: Influence of layer charge and charge location
- Growth of large (1 mm) MgSiO3 perovskite single crystals: A thermal gradient method at ultrahigh pressure
- Carbon is not required during crystallization to produce ferrobasalts/ferrodiorites (FTP rocks)
- Letter: Meridianiite: A new mineral species observed on Earth and predicted to exist on Mars
- Letter: Equations of state of CaIrO3 perovskite and post-perovskite phases
- Letter: Hydrogen-carbonate ion in synthetic high-pressure apatite
- Letter: Effects of irradiation damage on the back-scattering of electrons: Silicon-implanted silicon
- Letter: High-precision oxygen isotope analysis of picogram samples reveals 2 μm gradients and slow diffusion in zircon
Keywords for this article
Ti-rich pargasite;
Lherz (French Pyrenees);
single-crystal FTIR spectroscopy;
anion occupancy
Articles in the same Issue
- Ferric iron in Al-bearing akimotoite coexisting with iron-nickel metal in a shock-melt vein in an L-6 chondrite
- Solidification and microstructures of binary ice-I/hydrate eutectic aggregates
- A monazite oxygen isotope thermometer
- The albite fusion curve re-examined: New experiments and the high-pressure density and compressibility of high albite and NaAlSi3O8 liquid
- XRD and HRTEM analyses of stacking structures in sudoite, di-trioctahedral chlorite
- Vibrational dynamics in H+-substituted forsterite: A first-principles molecular dynamics study
- Fluorophlogopite from Biancavilla (Mt. Etna, Sicily, Italy): Crystal structure and crystal chemistry of a new F-dominant analog of phlogopite
- Pressure-induced over-hydration of thomsonite: A synchrotron powder diffraction study
- High-pressure optical spectroscopy and X-ray diffraction studies on synthetic cobalt aluminum silicate garnet
- In situ observation of the decomposition of kyanite at high pressures and high temperatures
- Mineralogy and crystal structure of bouazzerite from Bou Azzer, Anti-Atlas, Morocco: Bi-As-Fe nanoclusters containing Fe3+ in trigonal prismatic coordination
- Single-crystal structure refinement of diaspore at 50 GPa
- FTIR spectroscopy of Ti-rich pargasites from Lherz and the detection of O2- at the anionic O3 site in amphiboles
- The relative stability of monazite and huttonite at 300 - 900 °C and 200 - 1000 MPa: Metasomatism and the propagation of metastable mineral phases
- Acoustic dissipation associated with phase transitions in lawsonite, CaAl2Si2O7(OH)2·H2O
- Magnetic anisotropy of carbonate minerals at room temperature and 77 K
- Non-ideality and defectivity of the åkermanite-gehlenite solid solution: An X-ray diffraction and TEM study
- The system Al2O3-P2O5-H2O at temperatures below 200 °C: Experimental data on the stability of variscite and metavariscite AlPO4·2H2O
- Low-pressure decomposition of chrysotile as a function of time and temperature
- Ion exchange equilibrium and structural changes in clinoptilolite irradiated with β- and γ-radiation: Monovalent cations
- Investigation of dioctahedral smectite hydration properties by modeling of X-ray diffraction profiles: Influence of layer charge and charge location
- Growth of large (1 mm) MgSiO3 perovskite single crystals: A thermal gradient method at ultrahigh pressure
- Carbon is not required during crystallization to produce ferrobasalts/ferrodiorites (FTP rocks)
- Letter: Meridianiite: A new mineral species observed on Earth and predicted to exist on Mars
- Letter: Equations of state of CaIrO3 perovskite and post-perovskite phases
- Letter: Hydrogen-carbonate ion in synthetic high-pressure apatite
- Letter: Effects of irradiation damage on the back-scattering of electrons: Silicon-implanted silicon
- Letter: High-precision oxygen isotope analysis of picogram samples reveals 2 μm gradients and slow diffusion in zircon
