Rare Earth Element Patterns in the Karst Terrains of Guizhou Province, China: Implication for Water/Particle Interaction |
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Authors: | Guilin Han Zhifang Xu Yang Tang Guoping Zhang |
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Institution: | (1) The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou, 550002, China;(2) Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. BOX 9825, Beijing, 100029, China;(3) Graduate School of Chinese Academy of Sciences, Beijing, 100039, China |
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Abstract: | The authors determine the concentrations of dissolved (<0.22 μm) rare earth elements (REE) and suspended particulate matter
(SPM) of typical karst rivers in Guizhou Province, China during the high-flow period. The concentrations of acid-soluble REE
extracted from SPM using diluted hydrochloric acid are also obtained to investigate water/particle interaction in the river
water. The dissolved REE contents in the river water are extremely low in the rivers of the study. The dissolved REE distribution
patterns normalized by the Post Archean Australia Shale (PAAS) in the karst rivers are not flat, show slight enrichment of
heavy REE to light REE, and also have significant negative Ce and Eu anomalies. The acid-soluble REE appears to have similar
distribution patterns as characterized by MREE enrichment and slight LREE depletion, with unremarkable Ce and Eu anomalies.
The PAAS-normalized REE distribution patterns of SPM are flat with negative Eu anomalies. The contents and distribution patterns
of REE in the SPM are closely related to the lithological character of the source rocks. The SPM contains almost all the REE
produced in the process of surficial weathering. This demonstrates that particle-hosted REE are the most important form of
REE occurrence. REE fractionation, which takes place during weathering and transport, leads to an obvious HREE enrichment
in the dissolved loads relative to the SPM. Y/Ho ratio can be used to shed light on REE behaviors during water/particle interaction. |
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