Fig. 5: Grain size and geochemical fingerprinting results from closely spaced sand mines on the Colorado River.
From: Fingerprinting construction sand-supply networks for traceable sourcing
a Grain size for upper Colorado River mine samples displayed as weight percent cumulative distributions measured in test sieves. Samples are colour coded by type. b Bulk major element X-ray fluorescence analysis (XRF) results for upper Colorado River mine samples. c Chondrite normalised Rare Earth Element (REE; Taylor and McClennan, 1985) signatures of sand from mining location uCRm1 which taps Holocene upper Colorado River terraces. d Chondrite normalised Rare Earth Element (REE; Taylor and McClennan, 1985) signatures of sand from mining location uCRm4 which taps Pleistocene upper Colorado River terraces. Note that this is the only figure that includes results for masonry sand samples.
