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LREE was extracted using 75% (v/v) ethanol, and the quality of the LREE was detected using high performance liquid chromatography with the standard Linderane (Figure 1).
The LREE and HREE contents in ore-bearing quartz are 3.27-9.37 ppm and 0.291.32 ppm, respectively, while those in barren quartz are 0.41-6.17 ppm and 0.060.33 ppm, respectively.
Figure 4 shows the relationship of [SIGMA]REE, HREE and LREE in each density fraction of the oil shale sample with its ash content.
This decrease in calcite solubility results in an important shift in the fractionation behavior of HREE versus LREE with increasing temperature.
But Eckardt has been upbeat, saying, "Early indicators are favorable, with customers buying and selling homes through our platform with our LREEs."
Sample 15-72 from the Wellington Lake Granite contains the highest overall REE abundances, exhibits the highest normalized LREE enriched pattern [[(La/Yb).sub.N] = 7.73] that is accompanied by a relatively small negative Eu anomalies (Eu/[Eu.sup.*] = 0.06), likely reflecting fractionation in a more oxidized magmatic system where more of the Eu is present as [Eu.sup.+3] and hence would not be incorporated into the crystallizing plagioclase (e.g., Sisson and Grove 1993).
Chondrite-normalized REE patterns of all rocks are light REEs (LREEs) enriched relative to heavy REEs (HREEs).
Clay minerals formed during the weathering processes absorb greater LREE than HREE in alkaline environments (Wen et al., 2014).
The [SIGMA]REE varies from 3.15 to 82.90 ppm with notable LREE and HREE fractionation.
The same is true for the Nb-anomaly as well as for ratios of large-ion lithophile elements (LILE) to light rare earth elements (LREE) and LILE to high-field strength elements (HFSE) (see  for the importance of these ratios for subduction processes).
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