| Autor: |
Brugger, J., Bettiol, A. A., Costa, S., Lahaye, Y., Bateman, R., Lambert, D. D., Jamieson, D. N. |
| Zdroj: |
Mineralogical Magazine; October 2000, Vol. 64 Issue: 5 p891-903, 13p |
| Abstrakt: |
AbstractIn situlaser ablation high resolution ICP-MS analyses of scheelite from hydrothermal veins at the Archaean Mt. Charlotte gold deposit (Western Australia) show inhomogeneous REEdistribution at small scale (<100 µm). In a limited number of samples, variations of the cathodoluminescence (CL) colours from blue to yellow are linked to the REEcontent of scheelite, and reveal oscillatory zoning of the REEwith zone widths between 1 µm and 100 µm. However, CL failed to reveal the zoning in most inhomogeneous scheelite samples. A nuclear microprobe has been used to characterize the distribution of REEin these samples. No reasonable map for the distribution of REEcould be obtained by particle induced X-ray emission, because of interferences with W-Llines. However, monochromatic ionoluminescence (IL) maps collected at the wavelength of the main REE3+luminescence peaks revealed oscillatory zoning. Therefore, IL is a powerful tool for mapping the distribution of REEin natural scheelite. Monochromatic IL maps allow us to determine the nature of the inhomogeneous distribution of REEin scheelite, fundamental information for using the REEin this mineral as a marker for the chemistry of ore-forming fluids, and for interpreting Sm-Nd isotopic data. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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