Abstract
Cathodoluminescence (CL) investigations of Phanerozoic marine limestones, sinter calcites and saddle dolomites of hydrothermal veins indicate that in contrast to previous knowledge rare earth element (REE)-activated CL in sediments is common. The methods of high-resolution spectrometric analysis of CL emission (HRS-CL) combined with ‘hot-cathode’ CL microscopy are able to prove qualitatively some REE below the detection limits of electron microprobe and proton-induced X-ray emission analysis (PIXE). Our investigations document Sm 3+, Dy 3+, Tb 3+ and probably Ho 3+-activated CL in calcite and Eu 3+-activated CL in a saddle dolomite of hydrothermal veins. Sometimes the REE-activated CL is hidden by dominant Mn 2+ emission. In such cases the REE emission spectrum may be obtained by subtracting a spectrum of luminescence produced only by Mn 2+. The occurrence of only one REE in natural samples is uncommon. In all observed samples REE are present in groups.
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