Titanium as a cathodoluminescence activator in alkali feldspars

Parsons, Ian, Steele, David A., Lee, Martin R. and Magee, Charles W. (2008) Titanium as a cathodoluminescence activator in alkali feldspars. American Mineralogist, 93 5-6: 875-879. doi:10.2138/am.2008.2711

Author Parsons, Ian
Steele, David A.
Lee, Martin R.
Magee, Charles W.
Title Titanium as a cathodoluminescence activator in alkali feldspars
Journal name American Mineralogist   Check publisher's open access policy
ISSN 0003-004X
Publication date 2008-05-01
Sub-type Article (original research)
DOI 10.2138/am.2008.2711
Open Access Status Not yet assessed
Volume 93
Issue 5-6
Start page 875
End page 879
Total pages 5
Place of publication Chantilly, VA, United States
Publisher Mineralogical Society of America
Subject 1906 Geochemistry and Petrology
1908 Geophysics
Formatted abstract
Albite patches in coarsely mesoperthitic alkali feldspars from the Klokken syenite have oscillatory zoning seen at blue wavelengths using cathodoluminescence. Using a five-spectrometer, high-resolution elemental mapping technique in an electron probe, we show a close correspondence between CL emission intensity and Ti, present at levels up to ∼200 ppm. Albite patches were analyzed for major and 16 trace elements by laser-ablation inductively coupled-plasma mass spectrometry. SEM elemental maps acquired simultaneously with the CL showed that a similar zoning pattern is exhibited by Ca, but there is no correlation between CL intensity and Ca concentration. None of the trace elements analyzed correlate with Ti. We conclude that tetrahedral Ti4+ is the most likely activator of blue luminescence in these albitic alkali feldspars possibly because of a defect associated with Al-O-Ti bridges. 
Keyword Alkali feldspar
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Published May-June 2008.

Document type: Journal Article
Sub-type: Article (original research)
Collection: Julius Kruttschnitt Mineral Research Centre Publications
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