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Non-crystalline hydrous feldspathoids in Late Permian carbonate rock

Published online by Cambridge University Press:  09 July 2018

C. Bender Koch
C. Bender Koch*
Affiliation:
Laboratory of Applied Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark
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Abstract

The EDTA-insoluble residues from five samples (two from the oolitic shoal facies and three from the lagoonal facies) of the Late Permian Ca-2 unit (Zechstein) have been investigated by X-ray diffraction, infrared spectroscopy, and scanning and transmission electron microscopy with energy dispersive X-ray analysis (EDXA). The results show that spheres of non-crystalline hydrous feldspathoids (with Al/Si molar ratio between 1·5 and 2·2) dominate the residues of samples from the oolitic shoal facies. Samples from the lagoonal facies are dominated by crystalline material (muscovite and quartz), but two of the samples contain a small number of spheres. Analyses of these samples by selective area diffraction and EDXA revealed the presence of small amounts of non-crystalline hydrous feldspathoids with Al/Si molar ratio between 0·1 and 1·9.

Type
Research Article
Information
Clay Minerals , Volume 26 , Issue 4 , December 1991 , pp. 527 - 534
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1991

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