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Use of the Soft X-Ray Spectrograph and the Electron-Probe Microanalyzer for Determination of Elements Carbon Through Iron in Minerals and Rocks

Published online by Cambridge University Press:  06 March 2019

A. K. Baird  and
D. H. Zenger
A. K. Baird
Affiliation:
Pomona College, Claremont, California
D. H. Zenger
Affiliation:
Pomona College, Claremont, California
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Abstract

The major elements m common rocks are of low atomic number, but analyses of high precision are possible by soft X-ray spectrography if several grams of rock sample are available. The electron-probe microanalyzer is shown to complement this established method by permitting analyses of particles as small as 1 μ in diameter. This paper describes applications of these methods to the analysis of the major and minor elements of silicate, carbonate, and phosphate minerals and rocks.

Elements of particular interest are as follows : carbon in particles enclosed in carbonate rocks; oxygen, as the major constituent of the specimens; phosphorus in phosphatic nodules and apatites; manganese and iron, as colorations in fossil shells; and the group oxygen, sodium, magnesium, aluminum, silicon, potassium, calcium, and iron as complex segregations and zonations within single crystals of several mineral phases.

If the bulk composition of a rock is known, and also the chemistry of the constituent minerals, it is possible to compute quantitative minéralogie analyses of high precision. Thus, the combined use of soft X-ray spectrography and electronprobe microanalysis can provide quantitative chemical and mineralogicat information on the earth's crust on all scales from thousands of square miles (by means of appropriate sampling) down to the scale of 1 μ.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 9: Fourteenth Annual Conference on Applications of X-ray Analysis, August 25-27, 1965 , 1965 , pp. 487 - 503
Copyright
Copyright © International Centre for Diffraction Data 1965

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References

1. Henke, B. L., “Sodium and Magnesium Fluorescence Analysis—Part I: Method,” in: W. M. Mueller, G. R. Mallett, and M. J. Fay (eds.), Advances in X-Ray Analysis, Vol. 6, Plenum Press, New York, 1963, p. 361.Google Scholar
2. Henke, B. L., “X-ray Fluorescence Analysis for Sodium, Fluorine, Oxygen, Nitrogen, Carbon, and Boron,” in: W. M. Mueller, G. R. Mallett, and M. J. Fay (eds.), Advances in X-Ray Analysis, Vol. 7, Plenum Press, New York, 1964, p. 460.Google Scholar
3. Henke, B. L., “Some Notes on Ultrasoft X-Ray Fluorescence Analysis—-10 to 100 A Region,” in: W. M. Mueller, G. R. Mallett, and M. J. Fay (eds.) Advances in X-ray Analysis, Vol. 8, Plenum Press, New York, 1965, p. 269.Google Scholar
4. Welday, E. E., Baird, A. K., McIntyre, D. B., and Madlem, K. W., “Silicate Sample Preparation for Light Element Analyses by X-ray Spectrography,” Am. Mineralogist 49: 809, 1964.Google Scholar
5. Mclntyre, D. B., “Fortran II Programs for X-ray Fluorescence,” Technical Report 13, Department of Geology, Pomona College, 1964.Google Scholar
6. Baird, A. K., McIntyre, D. B., and Welday, E. E., “Soft and Very Soft Fluorescence Analysis: Spectrographic and Electronic Modifications for Optimum, Automated Results,” Develop. Appl. Spectr. 4: 3, 1965.Google Scholar
7. Baird, A. K. and Henke, B. L., “Oxygen Determinations in Silicates and Total Major Elemental Analysis of Rocks by Soft X-Ray Spectrometry,” Anal. Chem. 37: 727, 196S.Google Scholar
8. Baird, A. K., Mclntyre, D. B., Welday, E. E., and Madlem, K. W., “Chemical Variations in a Granitic Pluton and its Surrounding Rocks,” Science 146: 258, 1964.Google Scholar
9. Baird, A. K., Mclntyre, D. B., and Welday, E. E., “Granitic Rocks of the San Bernardino Mountains, California: Chemical Composition and Variability Within 2000 Square Miles,” Geol. Soc. Am. Spec. Papers 82: 6, 1961 Google Scholar
10. Baird, A. K., McIntyre, D. B., Welday, E. E., and Morton, D. M., “A Test of Chemical Variability and Field Sampling Methods, Lake view Mountain Tonalité, Southern California Batholith,” Calif. Div. Mines and Geol., Shorter Cont., in press.Google Scholar
11. Copeland, D. A., “A Simple Device for Trimming Thin Sections,” Am. Mineralogist 50: 1128, 1965.Google Scholar
12. Johannsen, A., A Descriptive Petrography of the Igneous Rocks, Vol. 1, University of Chicago Press, Chicago, 1931, p. 89.Google Scholar
13. Mclntyre, D. E., “Fortran II Program for Norm and Von Wolff Computations,” Technical Report 14, Department of Geology, Pomona College.Google Scholar
14. Henke, B. L., “Application of Multilayer Analyzers to 15-150 Å Fluorescence Spectroscopy for Chemical and Valence Band Analysis,” this volume, p. 432.Google Scholar