application of micro-xrf to characterise diamond drill ... · portable xrf micro-xrf • portable...
TRANSCRIPT
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Application of micro-XRF to characterise diamond drill-core from lithium-caesium-tantalum pegmatites
By Dr Naomi Potter
Co-author: Dr Nigel Brand
AEGC Conference 04/09/19
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X-ray Source
Portable XRF Micro-XRF
• Portable spectrometer• Open beam • 8 mm, 5 mm, 3 mm spot size • Samples should be homogenized*• Focus on quantification in 1D• Na11 to U92(TRACER) • Mg12 to U92 (TITAN)
• Lab spectrometer• Interlocked system • 25 µm spot size • Can quantify but focused on 2D maps• Na11 to U92 (M4)• C6 to U92 (M4 Plus)
X-ray Source
Reminder about XRF
pXRF
µXRF
Courtesy of J.Knapp
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X-ray Source
Portable XRF Micro-XRF
• Portable spectrometer• Open beam • 8 mm, 5 mm, 3 mm spot size • Samples should be homogenized*• Focus on quantification in 1D• Na11 to U92(TRACER) • Mg12 to U92 (TITAN)
• Lab spectrometer• Interlocked system • 25 µm spot size • Can quantify but focused on 2D maps• Na11 to U92 (M4)• C6 to U92 (M4 Plus)
X-ray Source
Reminder about XRF
Courtesy of J.Knapp
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➢Mineral maps
➢Minimal sample preparation required
➢ Non-destructive
➢ Versatile range of sample types
➢Mapping size up to 16 x 19 cm
➢ Detection limits down to ppm levels
➢ Qualitative and quantitative analysis
➢ No carbon coating (e.g. SEM)
Benefits of µXRF
Courtesy of Bruker3 cm
Sr Rb Ca
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+ =
➢ Full X-ray spectrum for each pixel
➢ “On-the-fly” measurements
➢ Quantitative and qualitative
Ca Ca Mg
NiMo
Si
ZnV
1 cm
Element compositional maps
Courtesy of Bruker
➢ Element distribution and relationships
➢ Alteration and weathering textures
➢ Fluid pathways
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2 cm
Mineral mapping➢ Digital images and surface profiles
➢ Mineral identification, abundance and texture
➢ Particle and grain size distributions
Spodumene Illite
Quartz
Jadite
Apatite
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Sinclair Caesium Deposit
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Collect Core Samples
Portable XRF
Micro-XRF Selective Scanning
Workflow
Raman
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Microcline
15 cm
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K
Spot pXRF K2O: 9.67wt%
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Na
pXRF n/a
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Fe
Spot pXRF Fe: 7040 ppm
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Next question…
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18 cm
Microcline
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K
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Na
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Rb
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Mn
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Cs
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Cs - Na
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17.5 cm
Pollucite
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Cs
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Rb
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Mn
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Na
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K
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Sr
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Ca
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Ca-Sr-Rb
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Summary
➢ Rapid, non-destructive technique
➢ Versatile sample types and sizes
➢ Element distribution and mineral maps
Suited for rapid studies to investigate the micromorphology,
chemical variability and mineral alteration in samples
Courtesy of Bruker