Concurrent treatment of metamict and crystalline fergusonite by U, Th and Pb-rich fluids:an EMPA and TEM study

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Authors	ŠKODA Radek ČOPJAKOVÁ Renata KLEMENTOVÁ Mariana
Year of publication	2011
Type	Article in Periodical
Magazine / Source	Asociation Geologica Argentina, Series D.
MU Faculty or unit	Faculty of Science
Citation
Field	Geology and mineralogy
Keywords	fergusonite; metamict state; experimental alteration; EMPA; TEM; FIB
Description	Metamict and well crystalline fergusonite-(Y) were treated by U,Th,Pb-rich fluids at temperature 200oC for 60 days. The well crystalline fergusonite did not show any apparent features of alteration. The metamict fergusonite was intensivelly replaced by newly-formed U and Th-rich phases. The TEM study of the FIB prepared foils revealed, that Th-rich phase is amorphous, whereas the U-rich phase corresponds to UNb3O10. On the border of unchanged metamict fergusonite and newly-formed phases the numerous of nanopores were found. The alteration corresponds to dissolution-reaction-precipitation process.
Related projects:	The interaction of metamict minerals and hydrothermal fluids and its significance in the geological environment