Mineralogical composition of Jabal Nafusah phonolites.

Contenu

Titre

Mineralogical composition of Jabal Nafusah phonolites.

Créateur

Bausch, W. M. Voir tous les contenus avec cette valeur

Date

1980

Résumé

The Jabal Nafusah phonolites are characterized by the dominance of felsic components, or a very low colour ratio. As mentioned by Almond et al. (1974), phenocrysts (mostly of alkali feldspar) may occur, but generally the phonolites are fine grained, poorly crystallized or even aphyric. Along with microscope analysis, the mineralogical composition has been investigated, essentially by means of X-ray diffraction. The chief (felsic) components found were: sanidine, analcime, nepheline, sodalite and albite (given in order of approximately decreasing frequency). The frequency of analcime is quite remarkable, and has not been hitherto described. Also shown are the relations of changing proportions of mineralogical compositions and detailed X-ray data.

Editeur

Academic Press Voir tous les contenus avec cette valeur

Place

Londres

Langue

eng

ISBN

978-0-12-615503-7

Bausch, W. M., “Mineralogical composition of Jabal Nafusah phonolites.”, Academic Press, 1980, bibliographie, consulté le 18 septembre 2024, https://ibadica.org/s/bibliographie/item/1341