Li–Na interdiffusion and diffusion-driven lithium isotope fractionation in pegmatitic melts
Abstract 6 Li and 7 Li) in flux-rich (1.8 % Li2 O, 2.6 % B2 O3, 2.3 % P2 O5 and 3 % F) pegmatitic melts in order to contribute to the understanding of Li enrichment in such systems. Two glasses were synthesized with a model pegmatitic composition, one of which is highly enriched in Li (> ∘ C at 100 MPa with Ar as the pressure medium. We observed rapidly formed diffusion profiles, driven by an interdiffusive exchange of the monovalent alkalis Li and Na, while the other elements are immobile on the timescale of experiments (1–30 min). From these experiments, activation energies for Li–Na interdiffusion were determined as 99 ± - 1 D 0 = - ± D 0 2 s- 1 2 O (Holycross et al., 2018; Spallanzani et al., 2022). Using melt viscosity as a proxy for the polymerization of the melt shows that water has a stronger potential to depolymerize a melt compared to other fluxing elements. Faster diffusion of 6 Li compared to 7 Li leads to a strong Li isotope fractionation along the diffusion profile, resulting in δ 7 - β ± β β value of ca. 0.2 seems to be universally applicable to diffusive Li isotope fractionation in aluminosilicate melts.
- Standort
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Deutsche Nationalbibliothek Frankfurt am Main
- Umfang
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Online-Ressource
- Sprache
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Englisch
- Erschienen in
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Li–Na interdiffusion and diffusion-driven lithium isotope fractionation in pegmatitic melts ; volume:35 ; number:6 ; year:2023 ; pages:1009-1026 ; extent:18
European journal of mineralogy ; 35, Heft 6 (2023), 1009-1026 (gesamt 18)
- Urheber
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Singer, Christian R.
Behrens, Harald
Horn, Ingo
Oeser, Martin
Dohmen, Ralf
Weyer, Stefan
- DOI
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10.5194/ejm-35-1009-2023
- URN
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urn:nbn:de:101:1-2023112303281128622653
- Rechteinformation
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Letzte Aktualisierung
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15.08.2025, 07:37 MESZ
Datenpartner
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Beteiligte
- Singer, Christian R.
- Behrens, Harald
- Horn, Ingo
- Oeser, Martin
- Dohmen, Ralf
- Weyer, Stefan
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