Donwilhelmsite, [CaAl.sub.4./sub.Si.sub.2./sub.O.sub.11./sub.], a new lunar high-pressure Ca-Al-silicate with relevance for subducted terrestrial sediments

0536780 - FZÚ 2021 RIV US eng J - Článek v odborném periodiku
Fritz, J. - Greshake, A. - Klementová, Mariana - Wirth, R. - Palatinus, Lukáš - Trønnes, R.G. - Fernandes, V.A. - Böttger, U. - Ferrière, L.
Donwilhelmsite, [CaAl₄Si₂O₁₁], a new lunar high-pressure Ca-Al-silicate with relevance for subducted terrestrial sediments.
American Mineralogist. Roč. 105, č. 11 (2020), s. 1704-1711. ISSN 0003-004X. E-ISSN 1945-3027
Grant CEP: GA MŠMT(CZ) LO1603; GA MŠMT LM2018110
GRANT EU: European Commission(CZ) CZ.2.16/3.1.00/24510
Institucionální podpora: RVO:68378271
Klíčová slova: high-pressure phase * new mineral * donwilhelmsite * Oued Awlitis 001 lunar meteorite * shock metamorphism * subduction * mantle mineral * enriched mantle component
Obor OECD: Mineralogy
Impakt faktor: 3.003, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.2138/am-2020-7393

We report on the occurrence of a new high-pressure Ca-Al-silicate in localized shock melt pockets found in the feldspatic lunar meteorite Oued Awlitis 001 and discuss the implications of our discovery. The new mineral crystallized as tiny, micrometer-sized, acicular grains in shock melt pockets of roughly anorthitic bulk composition. Transmission electron microscopy based three-dimensional electron diffraction (3D ED) reveals that the CaAl4Si2O11 crystals are identical to the calcium aluminum silicate (CAS) phase first reported from static pressure experiments. This is the first time 3D ED was applied to structure determination of an extraterrestrial mineral.

Trvalý link: http://hdl.handle.net/11104/0314534