Physics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..767j&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 52, Issue 3, pp.767-770
Physics
2
Scientific paper
Recently, evidence has accumulated that certain carbonate and sulfate minerals undergo selective surface ion-exchange reactions with aqueous solutions at low temperatures. Evidence obtained by powder XRD, SIMS and XPS is presented here indicating that synthetic rare earth element (REE) phosphate mineral analogues undergo similar reactions. Hydrous Ho-xenotime reacts with aqueous Nd 3+ over a period of months to produce Nd-rhabdophane. Sm- and Nd-monazite crystals undergo detectable surface exchange reactions within 5 days at 65°C. Ho- and Er-xenotime react similarly. Exchange of Y and Lu in the surface layers of Lu-xcnotime is pH dependent, with lower pH favouring replacement. Clearly, such effects are relevant to the debate about REE concentrations and signatures in natural waters, particularly in view of the widespread occurrence of monazite in nature.
Bancroft Michael G.
Boatner Lynn A.
Jonasson Ralph G.
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