Journal articles
The OH-F substitution in synthetic pargasite at 1.5 kbar, 850 °C.
Abstract : Amphiboles were synthesized at 1.5 kbar PH2O and 850 °C along the join pargasite-fluoropargasite. Structural variations in the amphibole as a function of F have been characterized by a combination of SEM-EDS, X-ray powder diffraction, and infrared spectroscopy. SEM-EDS analyses show that, for increasing F in the system, there is a decrease in Altot in the amphibole and a significant decrease of F incorporation in the structure. In agreement with the EDS data, the variation in cell parameters and IR spectra show that incorporation of F in pargasite is restricted to about 1.0 atoms per formula unit (apfu). The OH-stretching spectra show fine structure caused by F replacing OH at the O3 anion site, and are consistent with two-mode behavior typical of A-site-filled amphiboles. The agreement between calculated and observed relative band intensities suggests complete short-range disorder of OH and F at the O3 anion site.
Cited literature [40 references]
https://hal-insu.archives-ouvertes.fr/hal-00077556
Contributor : Nathalie Pothier <>
Submitted on : Wednesday, May 31, 2006 - 11:04:35 AM
Last modification on : Thursday, June 18, 2020 - 12:46:02 PM
Long-term archiving on: : Monday, April 5, 2010 - 9:57:52 PM
Contributor : Nathalie Pothier <>
Submitted on : Wednesday, May 31, 2006 - 11:04:35 AM
Last modification on : Thursday, June 18, 2020 - 12:46:02 PM
Long-term archiving on: : Monday, April 5, 2010 - 9:57:52 PM