Hydrogeochemical and Structural Controls on Rare Earth Element Distribution in Spring Waters from the Chongqing, China.

Bibliographic Details
Title: Hydrogeochemical and Structural Controls on Rare Earth Element Distribution in Spring Waters from the Chongqing, China.
Authors: Guo J; Institute of Water Resources Utilization and Water Environment, School of Architecture and Engineering, Yan'an University, Yan'an, China., Wang C; Institute of Water Resources Utilization and Water Environment, School of Architecture and Engineering, Yan'an University, Yan'an, China., Jiang W; Tianjin Center, China Geological Survey, Tianjin, China.; Tianjin Key Laboratory of Coast Geological Processes and Environmental Safety, Tianjin, China., Zhang C; The Chinese Academy of Natural Resources Economics, Sanhe, China.
Source: Water environment research : a research publication of the Water Environment Federation [Water Environ Res] 2026 Jul; Vol. 98 (7), pp. e70503.
Publication Type: Journal Article
Language: English
Journal Info: Publisher: Wiley Subscription Services on behalf of The Water Environment Foundation Country of Publication: United States NLM ID: 9886167 Publication Model: Print Cited Medium: Internet ISSN: 1554-7531 (Electronic) Linking ISSN: 10614303 NLM ISO Abbreviation: Water Environ Res Subsets: MEDLINE
Imprint Name(s): Publication: Hoboken, NJ : Wiley Subscription Services on behalf of The Water Environment Foundation
Original Publication: Alexandria, VA : The Federation, c1992-
MeSH Terms: Metals, Rare Earth*/chemistry , Metals, Rare Earth*/analysis , Natural Springs*/chemistry , Water Pollutants, Chemical*/chemistry , Water Pollutants, Chemical*/analysis, Groundwater/chemistry ; China ; Environmental Monitoring
Abstract: Rare earth elements (REEs) are effective tracers of groundwater circulation and water-rock interaction in carbonate aquifers. This study investigates hydrochemical parameters and REE compositions of spring waters from Chongqing (eastern Sichuan Basin) to clarify controls on REE mobilization, fractionation, and redox behavior within a fold-controlled karst aquifer. Spring waters exhibit slightly acidic to slightly alkaline pH values (6.2-8.4) and variable redox conditions (Eh from -338 to 148 mV). Hydrochemical facies evolve from Ca-HCO3 and Ca·Mg-SO4 types to Na-Cl and Na-SO4 types, indicating a transition from shallow recharge systems to deeper, structurally controlled groundwater circulation. Total dissolved REE concentrations (ΣREE) range from 0.025 to 1.732 μg/L and show clear spatial variability, with relatively higher values occurring in structurally complex southeastern zones. Correlation analysis indicates that ΣREE concentrations are weakly related to salinity but are influenced by temperature, redox conditions, and bicarbonate availability, reflecting the importance of groundwater circulation depth and water-rock interaction. NASC-normalized REE patterns consistently display LREE depletion and relative MREE-HREE enrichment, typical of carbonate aquifers. Predominantly, Eu anomalies suggest localized reducing or thermally influenced environments associated with deeper groundwater circulation. REE behavior in Chongqing spring waters is indirectly controlled by tectonic structure through its regulation of groundwater circulation and hydrochemical conditions.
(© 2026 Water Environment Federation.)
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Grant Information: 22JK0623 Shaanxi Provincial Department of Education; 2022SLSFGG-004 Shaanxi Provincial Department of Science and Technology Plan Project; S202510719128 Undergraduate Innovation and Entrepreneurship Training Program of Shaanxi Province; YDBK2019-36 Natural Science Research Project of Yan'an University
Contributed Indexing: Keywords: Eastern Sichuan Basin; carbonate aquifer; hydrogeochemistry; rare earth elements; spring water; structural control
Substance Nomenclature: 0 (Metals, Rare Earth)
0 (Water Pollutants, Chemical)
Entry Date(s): Date Created: 20260724 Date Completed: 20260724 Latest Revision: 20260728
Update Code: 20260729
PubMed Central ID: PMC13398403
DOI: 10.1002/wer.70503
PMID: 42496590
Database: MEDLINE
Description
ISSN:1554-7531
DOI:10.1002/wer.70503