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Accurate quantification of the modal mineralogy of rocks when image analysis is difficult

Published online by Cambridge University Press:  05 July 2018

P. F. Schofield ,
K. S. Knight ,
S. J. Covey-Crump ,
G. Cressey  and
I. C. Stretton
P. F. Schofield*
Affiliation:
Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK
K. S. Knight
Affiliation:
Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
S. J. Covey-Crump
Affiliation:
Department of Earth Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK
G. Cressey
Affiliation:
Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK
I. C. Stretton
Affiliation:
Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, D-95440, Germany
*
*E-mail: p.schofield@nhm.ac.uk
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Abstract

The volume proportions of the mineral phases in two strongly deformed olivine-orthopyroxene rocks have been quantified by whole-pattern stripping of fixed geometry X-ray powder diffraction data. The results were compared with the phase proportions as determined by Rietveld refinement of time-of-flight neutron powder diffraction data, and were shown to be in excellent agreement. The X-ray technique not only provides a very rapid and cost-effective method of determining phase proportions, but it also circumvents several of the problems associated with obtaining this information by image analysis. Moreover, the technique is particularly advantageous in strongly textured rocks or in rocks that contain significant residual strains. As such it offers a powerful technique for analysing the mineralogical composition of fine-grained and/or deformed experimental run products, which makes it of considerable potential for monitoring in situ the progress of mineral reactions during laboratory experiments.

Keywords

phase quantificationX-ray diffractionneutron diffractionolivine-orthopyroxene rocks
Type
Research Article
Information
Mineralogical Magazine , Volume 66 , Issue 1 , February 2002 , pp. 189 - 200
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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