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Chemical Constraints in Quantitative X-ray Powder Diffraction for Mineral Analysis of the Sand/Silt Fractions of Sedimentary Rocks

Published online by Cambridge University Press:  06 March 2019

D. K. Smith ,
G. G. Johnson Jr. ,
M. J. Kelton  and
C. A. Andersen
D. K. Smith
Affiliation:
Department of Geosciences and Materials Research Laboratory The Pennsylvania State University, University Park, PA 16802
G. G. Johnson Jr.
Affiliation:
Department of Geosciences and Materials Research Laboratory The Pennsylvania State University, University Park, PA 16802
M. J. Kelton
Affiliation:
Advanced Analytical Services Exploration and Production Research Laboratories ARCO Oil and Gas Company, Plano, TX 75075
C. A. Andersen
Affiliation:
Advanced Analytical Services Exploration and Production Research Laboratories ARCO Oil and Gas Company, Plano, TX 75075
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Abstract

Quantitative X-ray powder diffraction using the complete digitized diffraction pattern has proved to be an effective approach to improving the accuracy of the analysis of complex mineral mixtures, provided representative reference patterns and accurate Reference Intensity Ratio (RIR) factors arc available for each component phase. However, chemical and structural variability of common rock-forming minerals may complicate the pattern fitting approach. A method has been developed which utilizes X-ray fluorescence chemistry of an unknown and realistic compositional ranges for component phases as constraints on the quantitative XRD analysis without significant compromise of the pattern fit. This unique approach no only yields accurate weight fractions, but also provides indications of the specific compositions of each phase present in the mixture.

Type
VIII. Applications of Digitized XRD Patterns
Information
Advances in X-Ray Analysis , Volume 32: Thirty-Seventh Annual Conference on Applications of X-ray Analysis, August 1-5, 1988 , 1988 , pp. 489 - 496
Copyright
Copyright © International Centre for Diffraction Data 1988

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References

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