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CANMET electron microprobe (10 oxides)
CANMET electron microprobe, 10 oxides.
Semi-quantitative chemical analyses were carried out in the CANMET laboratories in Ottawa, using a JEOL 8900 electron microprobe operating at 20 kV and 40 nA. Peak counting times of 10 seconds were used for Na2O, K2O, CaO, Total Fe as FeO, MgO, Al2O3, MnO, and SiO2 and 40 seconds for TiO2 and Cr2O3. Calibration was confirmed at the beginning and end of each batch, and background determinations were made on every 50th grain. The analyses were completed in automated runs which were driven by a set of x-y-z coordinates for one point per grain, selected to avoid inclusions, fractures or pits. At the end of each batch, several grains1were reanalyzed at another similar point to monitor precision related to grain heterogeneity, calibration drift, or unusual background measurements. These replicates indicate good reproducibility above 0.1% for all elements, with a few exceptions attributed to heterogeneity.
1 Every 28th grain, on average, was re-analysed for the SE Manitoba survey (GSC Open File 2750). Every 45th grain, on average, was re-analysed for the Prairies survey (GSC Open File 2875).
[Description taken from GSC Open Files 2750 and 2875]
Sample material: solid
Sample weight: unstated
|Index||Method Order||Method ID||Quantity||Detection Limit|
Associated Analytical Packages:
|Index||Package ID||Package Name|
|1||288||CANMET electron microprobe (10 oxides)|
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