Details
| Original language | English |
|---|---|
| Pages (from-to) | 33-46 |
| Number of pages | 14 |
| Journal | Schweizerische Mineralogische und Petrographische Mitteilungen |
| Volume | 83 |
| Issue number | 1 |
| Publication status | Published - Jan 2003 |
Abstract
Fe-rich trioctahedral micas hydrothermally synthesized are characterized by infrared spectroscopy, the spectra are collected from powder suspensions. In the lattice vibrational range, the vibrations Si-Onb, Si-Ob, Al-Onb, Al-O-Si, Si-O-Si and δOH are all characterized by the presence of doublets in the annite KBr-absorption spectra. In agreement with observations in the vibrational range of the OH-group, this feature is interpreted to reflect the chemical heterogeneity of the octahedral and tetrahedral layers, imposed by crystallochermical constraints. With increasing Al content of the micas along the annite-siderophyllite join, the evolution of the bands shows that Al and Si become more ordered in the tetrahedral layer. In the interlayer vibrational range, the OH-annite end-member shows clearly five of the six predicted vibrations. The bands occuring at 66 cm-1 and at 120-130 cm-1 are related to vibrations involving interlayer cation, whereas the band observed at 152 cm-1 is assigned to basal oxygen vibrations around the interlayer cations. The Tschermak substitution (starting from the annite end-member) increases the misfit between the octahedral and tetrahedral layers. However, variations of fO2 do not affect significantly the band frequencies resulting from motions related to the interlayer cations, suggesting that the geometry of the interlayer site is not significantly disturbed by variation of the FC3+/FC2+ ratio in annite.
Keywords
- Annite, Fe-eastonite, Infrared absorption, Lattice and interlayer infrared vibrations, Siderophyllite
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geology
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Schweizerische Mineralogische und Petrographische Mitteilungen, Vol. 83, No. 1, 01.2003, p. 33-46.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Infrared spectra of annite in the interlayer and lattice vibrational range
AU - Boukili, Boubker
AU - Holtz, François
AU - Bény, Jean Michel
AU - Abdelouafi, Abdellah
AU - Niazi, Saida
N1 - Copyright: Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.
PY - 2003/1
Y1 - 2003/1
N2 - Fe-rich trioctahedral micas hydrothermally synthesized are characterized by infrared spectroscopy, the spectra are collected from powder suspensions. In the lattice vibrational range, the vibrations Si-Onb, Si-Ob, Al-Onb, Al-O-Si, Si-O-Si and δOH are all characterized by the presence of doublets in the annite KBr-absorption spectra. In agreement with observations in the vibrational range of the OH-group, this feature is interpreted to reflect the chemical heterogeneity of the octahedral and tetrahedral layers, imposed by crystallochermical constraints. With increasing Al content of the micas along the annite-siderophyllite join, the evolution of the bands shows that Al and Si become more ordered in the tetrahedral layer. In the interlayer vibrational range, the OH-annite end-member shows clearly five of the six predicted vibrations. The bands occuring at 66 cm-1 and at 120-130 cm-1 are related to vibrations involving interlayer cation, whereas the band observed at 152 cm-1 is assigned to basal oxygen vibrations around the interlayer cations. The Tschermak substitution (starting from the annite end-member) increases the misfit between the octahedral and tetrahedral layers. However, variations of fO2 do not affect significantly the band frequencies resulting from motions related to the interlayer cations, suggesting that the geometry of the interlayer site is not significantly disturbed by variation of the FC3+/FC2+ ratio in annite.
AB - Fe-rich trioctahedral micas hydrothermally synthesized are characterized by infrared spectroscopy, the spectra are collected from powder suspensions. In the lattice vibrational range, the vibrations Si-Onb, Si-Ob, Al-Onb, Al-O-Si, Si-O-Si and δOH are all characterized by the presence of doublets in the annite KBr-absorption spectra. In agreement with observations in the vibrational range of the OH-group, this feature is interpreted to reflect the chemical heterogeneity of the octahedral and tetrahedral layers, imposed by crystallochermical constraints. With increasing Al content of the micas along the annite-siderophyllite join, the evolution of the bands shows that Al and Si become more ordered in the tetrahedral layer. In the interlayer vibrational range, the OH-annite end-member shows clearly five of the six predicted vibrations. The bands occuring at 66 cm-1 and at 120-130 cm-1 are related to vibrations involving interlayer cation, whereas the band observed at 152 cm-1 is assigned to basal oxygen vibrations around the interlayer cations. The Tschermak substitution (starting from the annite end-member) increases the misfit between the octahedral and tetrahedral layers. However, variations of fO2 do not affect significantly the band frequencies resulting from motions related to the interlayer cations, suggesting that the geometry of the interlayer site is not significantly disturbed by variation of the FC3+/FC2+ ratio in annite.
KW - Annite
KW - Fe-eastonite
KW - Infrared absorption
KW - Lattice and interlayer infrared vibrations
KW - Siderophyllite
UR - http://www.scopus.com/inward/record.url?scp=0141681943&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0141681943
VL - 83
SP - 33
EP - 46
JO - Schweizerische Mineralogische und Petrographische Mitteilungen
JF - Schweizerische Mineralogische und Petrographische Mitteilungen
SN - 0036-7699
IS - 1
ER -