Results

Rock REE Concentrations

The high oxide production tune resulted in (as expected) greater oxide production ratios for all isotopes as compared to the low oxide production tune. Also, the isotopic concentrations were higher when using the low vs the high oxide tune, respectively.

The carbonate fraction of the rock produced lower overall REE concentrations than the whole rock. Gadolinium had the highest concentrations for all rocks. Each rock varied significantly in their REE composition.

High Oxide Production

Tables 1 & 2: Isotopic concentrations in ppm for each sample using high oxide production mode. All negative values are lower than the limit of detection. LG: Lower Glen Rose, Hen: Hensel, CC: Cow Creek, Ham: Hammett, CO3: carbonate fraction of rock, WR: whole rock

Low Oxide Production

Tables 3 & 4: Isotopic concentrations in ppm for each sample using low oxide production mode. All negative values are lower than the limit of detection. LG: Lower Glen Rose, Hen: Hensel, CC: Cow Creek, Ham: Hammett, CO3: carbonate fraction of rock, WR: whole rock

Oxide Production Ratios

Table 5: Oxide production ratios for each tune