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American Mineralogist; February 2007; v. 92; no. 2-3; p. 235-242; DOI: 10.2138/am.2007.2152
© 2007 Mineralogical Society of America
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Combined cathodoluminescence hyperspectral imaging and wavelength dispersive X-ray analysis of minerals

Paul R. Edwards1,*, Robert W. Martin1 and Martin R. Lee2

1 SUPA, Department of Physics, University of Strathclyde, 107 Rottenrow, Glasgow G4 0NG, U.K.
2 Department of Geographical and Earth Sciences, University of Glasgow, Lilybank Gardens, Glasgow G12 8QQ, U.K.

Correspondence: * E-mail: paul.edwards{at}strath.ac.uk

The usefulness of cathodoluminescence (CL) in mineralogy and petrology is largely due to its high sensitivity to variations in the chemical compositions of minerals. Difficulty in interpretation of CL images, however, often limits their use beyond the identification of growth zones, which are then analyzed using other, more readily quantifiable, techniques. The use of scanning electron microscopy (SEM) CL in hyperspectral imaging mode, combined with simultaneously acquired X-ray composition mapping, extends the technique by allowing the separation of spectral features and their correlation with elemental composition. In this paper, we describe the use of such measurements in conjunction with multivariate statistical analysis to automatically identify and characterize zones in calcite and zircon. We demonstrate that this novel combination of techniques significantly increases the effectiveness of CL as a diagnostic tool for Earth science applications.

Key Words: Cathodoluminescence • hyperspectral • principal components • calcite • zircon • X-ray microanalysis




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