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Zirconium and hafnium fractionation and distribution of Rare Earth Elements in neutral–alkaline waters: Case study of Lake Van hydrothermal system, Turkey
- Source :
- Journal of Geochemical Exploration, Journal of Geochemical Exploration, Elsevier, 2021, 226, pp.106784. ⟨10.1016/j.gexplo.2021.106784⟩
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- International audience; We investigated the distribution of Zr, Hf, and rare earth elements (REE) as the sum of lanthanides plus Y in the hydrothermal system in the Lake Van area of south-eastern Turkey. This system is characterised by water with variable pH in alkaline conditions resulting from hydrothermal CO2 upraise and neoformation of calcite minerals in near equilibrium with the interacting waters. Zr, Hf, and REE determinations were carried out for aqueous phases and suspended solids in lake water and surrounding thermal springs. We found that dissolved Hf is partitioned relative to Zr during calcite formation and that such fractionation is a function of the Ca2+ activity in warm water. The observed Zrsingle bondHf fractionation is explained by coulombic interactions that occur between suspended solid particles and dissolved phases at the calcite-water interface. There, the surfaces of carbonate minerals demonstrated greater reactivity towards aqueous Hf-bearing species relative to Zr-complexes. This evidence involves a coulombic mechanism of reactivity at the calcite-water interface because Hf complexes are negatively charged while Zr compounds are uncharged. Thus, authigenic calcite can behave as a suitable host for dissolved metal ion species to adsorb on crystal surfaces to remediate waste waters from mine drainage.
- Subjects :
- Calcite
Zirconium
Aqueous solution
Turkey
Chemistry
Inorganic chemistry
Carbonate minerals
chemistry.chemical_element
Alkaline lakes, REE, Turkey, Zr/Hf ratio
Authigenic
Fractionation
010501 environmental sciences
010502 geochemistry & geophysics
REE
Alkaline lakes
01 natural sciences
6. Clean water
Hydrothermal circulation
chemistry.chemical_compound
Adsorption
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry
Geochemistry and Petrology
Zr/Hf ratio
Economic Geology
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 03756742
- Volume :
- 226
- Database :
- OpenAIRE
- Journal :
- Journal of Geochemical Exploration
- Accession number :
- edsair.doi.dedup.....e5e7de7408c3f4e8ed914445c855a759