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Quantitative mineraiogical analyses of carbonate rich sediments by X-ray powder diffraction

Published online by Cambridge University Press:  10 January 2013

A. M. Mansour,
W. E. Piller and
C. L. Lengauer
A. M. Mansour
Affiliation:
Geology Department, Qena Faculty of Science, 83511 Qena, Egypt
W. E. Piller
Affiliation:
Institut f. Paläontologie, Universitàt Wien, Universitätstrasse 7, A-1010 Wien, Austria
C. L. Lengauer
Affiliation:
Institut f. Mineralogie und Kristallographie, Universität Wien, Dr. Karl Lueger-Ring 1, A-1010 Wien, Austria
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Abstract

The quantitative analysis of carbonate rich materials is tested with conventional and Rietveld methods. In the case of artificial mixtures of aragonite, calcite, Mg-calcite and quartz the Rietveld method provides reliable results with a maximum deviation of ±5 wt %. In the natural samples, however, the conventional methods give more reliable results in comparison to chemical and sedimentological measurements. This is caused by the peak overlap of calcite/Mg-calcite, peak roadening of the Mg-calcite, and the difficulties in the refinement of minor amounts of feldspar phases.

Keywords

Quantitative powder diffractioncarbonate analysisRietveld refinement

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Type
Research Article
Information
Powder Diffraction , Volume 10 , Issue 2 , June 1995, pp. 112 - 116
Copyright
Copyright © Cambridge University Press 1995

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