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@article{906931,
author = {Čobič, Andrea and Bermanec, Vladimir and Tomašič, Nenad and Škoda, Radek},
article_number = {3},
keywords = {allanite-(Ce); metamictization; hydrothermal recrystallization; X-ray diffraction; granitic pegmatite},
language = {eng},
issn = {0008-4476},
journal = {Canadian Mineralogist},
title = {The hydrothermal recrystallization of metamict allanite-(Ce)},
volume = {48},
year = {2010}
}
TY - JOUR
ID - 906931
AU - Čobič, Andrea - Bermanec, Vladimir - Tomašič, Nenad - Škoda, Radek
PY - 2010
TI - The hydrothermal recrystallization of metamict allanite-(Ce)
JF - Canadian Mineralogist
VL - 48
IS - 3
SP - 513-521
EP - 513-521
SN - 00084476
KW - allanite-(Ce)
KW - metamictization
KW - hydrothermal recrystallization
KW - X-ray diffraction
KW - granitic pegmatite
N2 - Samples of metamict allanite-(Ce) originating from granite pegmatites were recrystallized by heating in air and under hydrothermal conditions. Recrystallization in air resulted in partial recovery of the crystal structure at 650oC. Heating at higher temperatures resulted in decomposition of the allanite structure to a multiphase assemblage containing hematite, cerianite, feldspar, britholite and thorianite. To our knowledge, this is the first report of thorianite as a breakdown product of allanite in literature. The collapse of the structure is mainly related to the removal of structural H2O. Recrystallization under hydrothermal conditions yielded a more rapid and complete recovery of the structure at lower temperatures, without the appearance of additional phases. The stability of the allanite structure during hydrothermal recrystallization is related to the retention of OH- groups, available because of the aqueous environment of recrystallization. Also, H2O promotes a more rapid and efficient recrystallization due to the enhanced diffusion of cations. Crystallite size and strain calculation also record evidence of the recovery of the structure of damaged allanite.
ER -
ČOBIČ, Andrea, Vladimir BERMANEC, Nenad TOMAŠIČ and Radek ŠKODA. The hydrothermal recrystallization of metamict allanite-(Ce). \textit{Canadian Mineralogist}. 2010, vol.~48, No~3, p.~513-521. ISSN~0008-4476.
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