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Luminescence spectroscopy of Mn2+ rock-forming carbonates

Published online by Cambridge University Press:  05 July 2018

G. Walker ,
O. E. Abumere  and
B. Kamaluddin
G. Walker
Affiliation:
Dept. of Pure & Applied Physics, UMIST, Manchester M60 1QD
O. E. Abumere
Affiliation:
Dept. of Pure & Applied Physics, UMIST, Manchester M60 1QD
B. Kamaluddin
Affiliation:
Dept. of Pure & Applied Physics, UMIST, Manchester M60 1QD
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Abstract

Cathodoluminescence emission spectra and luminescence excitation spectra of Mn2+ in calcites, dolomites, magnesites, a manganocalcite and a rhodochrosite have been measured at both room temperature and 77 K. Ligand-field parameters have been calculated from the excitation spectra which reflect the size of the metal cation site in which the Mn2+ ion resides. The technique of luminescence excitation spectra has enabled the absorption profile of Mn2+ in Mg and Ca sites in dolomite to be separately determined. The variation of the distribution of Mn2+ between Mg and Ca sites in dolomites is demonstrated and discussed in terms of a simple model. It is concluded that the distribution of Mn2+ in dolomites may well provide information about its conditions of formation and/or subsequent alteration.

Keywords

cathodoluminescencemanganesecarbonatesdolomite
Type
Research Article
Information
Mineralogical Magazine , Volume 53 , Issue 370 , April 1989 , pp. 201 - 211
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1989

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Footnotes

†

Present addresses: Physics Dept. University of Port Harcourt, Nigeria

†

Present addresses: Physics Dept., University of Malaysia, Lembah Pentai, Kuala Lumpur, Malaysia.

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