Abstract
Fifty-seven shallow groundwater samples were collected from Guiyang karst basin, China, to analyze the aqueous rare-earth elements in low-water seasons and it is shown that the total amount of rare-earth elements (ΣREE) in karst groundwater is exceedingly low compared with that in carbonate rocks or weathering crusts of carbonate rocks, and ranges from 0.01 to 0.43, from 0.03 to 0.27, from 0.03 to 0.19 and from 0.05 to 1.38 μg·L−1 for dolomite, dolomitic & limestone, limestone and clastic rock aquifer, respectively. Both distributions and contents of rare-earth elements (REE) in karst groundwater reflect the lithology of host rocks or weathering crusts of carbonate rocks through which groundwater flows. The chondrite-normalized patterns show a non-flat profile with higher enrichment of slightly light rare-earth elements (LREE) than heavy rare-earth elements (HREE), prominent fractionation between LREE and HREE, negative Ce anomalies and negative or positive Eu anomalies. There is more obvious fractionation between LREE and HREE in groundwater than that in carbonate rocks and their weathering crusts due to high contents of HCO3 − and PH in groundwater. In shallow karst groundwater, REE(CO3) n 2n−3 (n=1 and 2) is the main inorganic species of REE. But for a clastic rock aquifer, both REESO4 + and REECO3 + are the main inorganic species of REE. Species of REE in groundwater is closely associated with the hydrochemical type of groundwater which is predominated by the lithology of host rocks, groundwater-rock interaction and weathering-pedogenesis of carbonate rocks.
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He, S., Zhu, L., Yang, R. et al. The geochemical characteristics of aqueous rare-earth elements in shallow karst groundwater in Guiyang City, China. Chin. J. Geochem. 30, 114–124 (2011). https://doi.org/10.1007/s11631-011-0492-8
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DOI: https://doi.org/10.1007/s11631-011-0492-8