The application of portable XRF and benchtop SEM-EDS to Cu-Pd exploration in the Coldwell Alkaline Complex, Ontario, Canada
Posted on 2016-08-01 - 14:55
Mineral exploration is increasingly taking advantage of real time techniques that dramatically reduce the costs and
time taken to obtain results compared to traditional analytical methods. Portable X-ray fluorescence (pXRF) is now a wellestablished
technique that is used to acquire lithogeochemical data. To date, however, benchtop scanning electron microscopes,
equipped with energy dispersive systems (bSEM-EDS) have received little attention as a possible mineral exploration tool.
This study examines the utility of combining pXRF and bSEM-EDS to characterize the igneous stratigraphy and its
relationship to Cu-Pd mineralization in a drill hole at the Four Dams occurrence, located within the Eastern Gabbro assemblage
of the Coldwell Alkaline Complex, Canada.
The first part of this study compares field portable and laboratory techniques. Seventy-two powdered samples analysed by
pXRF are compared with traditional major elements analysed by inductively coupled atomic emission spectroscopy (ICP-AES)
and trace elements by inductively coupled plasma spectrometry (ICP-MS), and the compositions of 128 olivine, clinopyroxene
and plagioclase grains analysed by bSEM-EDS are compared with traditional electron microprobe data. Our results show that
each portable technique yields results similar to their lab-based counterparts within the analytical capabilities and precisions of
the respective instruments.
The second part presents a case study for the application of pXRF and bSEM-EDS to resolve questions related to igneous
stratigraphy as an aid to mineral exploration in a complicated geological setting. A major problem for Cu-Pd exploration in the
Coldwell Complex of NW Ontario is that the oxide-rich units that host Cu-Pd mineralization in the Marathon Series are
petrographically similar to the barren oxide-rich units in the Layered Series. However, the mineralized units are geochemically
distinctive. Our results show that the mineralized Marathon Series can be distinguished from the barren Layered Series,
including oxide-rich units of both, by combinations of P2O5, Ba, Zr and V/Ti values, determined by pXRF, combined with
plagioclase, olivine or clinopyroxene compositions measured by bSEM-EDS. The combination of pXRF and bSEM-EDS thus
shows considerable promise as an exploration technique.
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Cao, Y. H.; Linnen, R. L.; Good, D. J.; Samson, I. M.; Epstein, R. (2016). The application of portable XRF and benchtop SEM-EDS to Cu-Pd exploration in the Coldwell Alkaline Complex, Ontario, Canada. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.3291518.v1
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AUTHORS (5)
YC
Y. H. Cao
RL
R. L. Linnen
DG
D. J. Good
IS
I. M. Samson
RE
R. Epstein