Skip to Main Content
Skip Nav Destination

Cathodoluminescence of magnesite; examples from the Eastern Alps

Christoph Spoetl
Cathodoluminescence of magnesite; examples from the Eastern Alps
Geology (Boulder) (January 1991) 19 (1): 52-55


Although Cathodoluminescence (CL) microscopy is routinely used in studies of carbonate diagenesis, this technique is rarely applied to the petrographic study of magnesitic rocks. Encouraging results, however, were obtained from very low grade metamorphic magnesite samples from the Eastern Alps. Crystal growth textures, unrecognizable in transmitted light,became clearly visible when a hot- cathode device was used. Spectrophotometric measurements show that Mn (super 2+) is the only activator, producing a broad emission peak at about 652 nm. Microprobe analyses indicate that the different CL intensities are controlled mainly by variations in the concentrations of Fe (super 2+) , because Mn (super 2+) concentrations are consistently high. Quenching of luminescence follows a logarithmic function, and magnesite containing more than 6.5 wt% FeO (corresponding to approximately 7.5 mol% FeCO (sub 3) ) was found to be nonluminescent (i.e.,levels of CL were below detection).

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 19
Serial Issue: 1
Title: Cathodoluminescence of magnesite; examples from the Eastern Alps
Author(s): Spoetl, Christoph
Affiliation: Univ. Bern, Geol. Inst., Bern, Switzerland
Pages: 52-55
Published: 199101
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 23
Accession Number: 1991-006647
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N46°45'00" - N47°45'00", E10°04'00" - E12°43'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1991
Close Modal

or Create an Account

Close Modal
Close Modal