Geochemical behavior of rare earth elements during the evolution of CO2-rich groundwater: A study from the Kangwon district, South Korea

Hyeon Su Choi, Seong Taek Yun, Yong Kwon Koh, Bernhard Mayer, Seong Sook Park, Ian Hutcheon

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

A hydrochemical study of CO2-rich groundwaters in the Kangwon district, South Korea, was conducted to elucidate the behavior of rare earth elements (REE) as a result of mixing of CO2-rich waters. The REE fractionation during the formation of carbonate precipitates was also investigated. The CO2-rich waters can be classified into three chemical types (Na-HCO3, Ca-Na-HCO3, and Ca-HCO3) with characteristic isotope compositions. Chemical and isotope data indicate that the Na-HCO3 waters were influenced by a deep CO2 supply at depth, while other waters were formed by mixing between Na-HCO3 water and less-saline, shallow groundwater. Concentrations of total dissolved REE (ΣREE) in CO2-rich waters varied according to the water types and were highest in the Na-HCO3 waters (up to 3456 ng/L). Their ΣREE concentrations showed excellent correlations with parameters such as TDS, pH, alkalinity, δ18O, and tritium, indicating progressive mixing with shallow groundwater. The distribution of dissolved REE concentration showed different patterns dependent upon water type. The Na-HCO3 waters displayed an "S-shape" pattern with strong heavy REE (HREE) enrichment. In contrast, the Ca-Na-HCO3 water was characterized by a slight HREE enrichment, while the Ca-HCO3 water exhibited a relatively flat scattered, low REE (LREE) enrichment pattern. The REE patterns of the precipitates formed from the original waters and of the residual waters after removal of the precipitates were similar to those of the original CO2-rich waters, indicating that no REE fractionation occurred between precipitates and residual waters.

Original languageEnglish
Pages (from-to)334-343
Number of pages10
JournalChemical Geology
Volume262
Issue number3-4
DOIs
Publication statusPublished - 2009 May 30

Fingerprint

Rare earth elements
Groundwater
rare earth element
groundwater
Water
water
Precipitates
Fractionation
Isotopes
fractionation
isotope
Tritium
Carbonates
tritium
Alkalinity
alkalinity

Keywords

  • Carbonate precipitates
  • CO-rich groundwater
  • Groundwater mixing
  • Hydrochemistry
  • Kangwon district
  • Korea
  • Rare earth elements

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geology

Cite this

Geochemical behavior of rare earth elements during the evolution of CO2-rich groundwater : A study from the Kangwon district, South Korea. / Choi, Hyeon Su; Yun, Seong Taek; Koh, Yong Kwon; Mayer, Bernhard; Park, Seong Sook; Hutcheon, Ian.

In: Chemical Geology, Vol. 262, No. 3-4, 30.05.2009, p. 334-343.

Research output: Contribution to journalArticle

Choi, Hyeon Su ; Yun, Seong Taek ; Koh, Yong Kwon ; Mayer, Bernhard ; Park, Seong Sook ; Hutcheon, Ian. / Geochemical behavior of rare earth elements during the evolution of CO2-rich groundwater : A study from the Kangwon district, South Korea. In: Chemical Geology. 2009 ; Vol. 262, No. 3-4. pp. 334-343.
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