Li diffusion in plagioclase crystals and glasses – implications for timescales of geological processes

Abstract D Li i D Li A D Li i = 10 - 3.76 ± 0.58 exp⁡ - 180.0 ± 12.0 kJ mol - 1 R T m 2 s - 1 D Li A = 10 - 5.53 ± 0.16 exp⁡ - 151.7 ± 3.2 kJ mol - 1 R T m 2 s - 1 Our data indicate charge compensation of Li by Na in both the crystal and the glass. Chemical Li diffusion coefficients in An80 glass are up to 3 orders of magnitude slower compared to Li tracer diffusion in silicate and aluminosilicate glasses and melts, which is attributed to slow Na diffusion at high An content. Our results for chemical diffusion of Li in plagioclase crystals are 1.5–2 orders of magnitude slower than Li tracer diffusion in An- and Ab-rich plagioclase determined in previous studies. This indicates that earlier studies on natural intermediate plagioclase compositions have underestimated timescales by up to 2 orders of magnitude. For accurate determination of timescales from Li diffusion in plagioclase we suggest further exploring the role of Na and a possible dependence on An content.

Angaben zum Objekt

• Standort: Deutsche Nationalbibliothek Frankfurt am Main
• Umfang: Online-Ressource
• Sprache: Englisch

Verweise und Beziehungen

• Erschienen in: Li diffusion in plagioclase crystals and glasses – implications for timescales of geological processes ; volume:36 ; number:6 ; year:2024 ; pages:985-1003 ; extent:19 ; European journal of mineralogy ; 36, Heft 6 (2024), 985-1003 (gesamt 19)

Beteiligte, Orts- und Zeitangaben

• Urheber: Pohl, Florian ; Behrens, Harald ; Oeser, Martin ; Marxer, Felix ; Dohmen, Ralf

Weitere Informationen

• DOI: 10.5194/ejm-36-985-2024
• URN: urn:nbn:de:101:1-2501090907265.780526936546
• Rechteinformation: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Letzte Aktualisierung: 15.08.2025, 07:28 MESZ