Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Formation of Hydrous, Pyroxene-Related Phases from LiAlSiO4 Glass in High-Pressure Hydrothermal Environments
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Number of Authors: 42019 (English)In: ACS Earth and Space Chemistry, ISSN 2472-3452, Vol. 3, no 1, p. 8-16Article in journal (Refereed) Published
Abstract [en]

Hydrous Al-bearing pyroxene-related phases were synthesized by subjecting LiAlSiO4 glass to hydrothermal environments at pressures of 5-10 GPa and temperatures of 400-600 degrees C. LiAlSiO3(OH)(2) formed at 5 GPa, whereas at 10 GPa, product mixtures of LiAlSiO3(OH)(2) and Li3Al4(Si2O7)(SiO3)(2)(OH)(5) were obtained. The monoclinic structure of LiAlSiO3(OH)(2) has been previously characterized from single-crystal X-ray diffraction data (Spektor, K.; Fischer, A.; Haussermann, U. Crystallization of LiAlSiO4 Glass in Hydrothermal Environments at Gigapascal Pressures-Dense Hydrous Aluminosilicates. Inorg. Chem. 2016, 55 (16), 8048-8058, 10.1021/acs.inorgchem.6b01181). It resembles that of alpha-spodumene (LiAlSi2O6) and constitutes alternating layers of chains of corner-condensed SiO4 tetrahedra and chains of edge-sharing AlO6 octahedra. OH groups are part of the octahedral Al coordination and extend into channels provided within the SiO4 tetrahedron chain layers. The structure solution of Li3Al4(Si2O7)(SiO3)(2)(OH)(5), as detailed here, was achieved by rotational electron diffraction analysis, and the model was refined against synchrotron powder X-ray diffraction data (space group C2/c, a = 4.921 angstrom, b = 25.849 angstrom, c = 9.170 angstrom, and beta = 99.42 degrees). The crystal structure of Li3Al4(Si2O7)(SiO3)(2)(OH)(5) features chains and pairs of corner-condensed SiO4 tetrahedra, with the Si atoms equally distributed among the two structural units, and thus Li3Al4(Si2O7)(SiO3)(2)(OH)(5) is a rare example of a mixed inosorosilicate. LiAlSiO3(OH)(2) and Li3Al4(Si2O7)(SiO3)(2)(OH)(5) are structurally closely related to recently discovered hydrous magnesium aluminosilicate phases (i.e., HAPY and HySo), which form at conditions similar to the hydrous lithium aluminosilicates. The conjecture is made that hydrothermal environments following chlorite but also lawsonite breakdown generally afford conditions for the formation of hydrous, pyroxene-related, aluminosilicate phases, with compositions of M2(1-m)M1TO(3+n)(OH)(2-o) (0 < m, n, and o < 1). These phases could be transients in breakdown reactions but also stable at cold slab conditions and, thus, may play an important role to water storage and transport to the transition zone.

Place, publisher, year, edition, pages
2019. Vol. 3, no 1, p. 8-16
Keywords [en]
lithium aluminum silicates, hydrous pyroxene-like structures, rotational electron diffraction, multi-anvil synthesis, water transport in the mantle
National Category
Chemical Sciences Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-165698DOI: 10.1021/acsearthspacechem.8b00091ISI: 000456350500002OAI: oai:DiVA.org:su-165698DiVA, id: diva2:1285591
Available from: 2019-02-04 Created: 2019-02-04 Last updated: 2019-02-04Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full text

Search in DiVA

By author/editor
Ångström, JonasJenei, István ZoltánHäussermann, Ulrich
By organisation
Department of Materials and Environmental Chemistry (MMK)
Chemical SciencesEarth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 21 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf