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

0358468 - ÚACH 2011 RIV AR eng J - Journal Article
Škoda, R. - Čopkajová, R. - Klementová, Mariana
Concurrent treatment of metamict and crystalline fergusonite by U, Th and Pb-rich fluids:an EMPA and TEM study.
Asociation Geologica Argentina, Series D. Roč. 14, č. 1 (2011), s. 197-199. ISSN 0328-2767
R&D Projects: GA AV ČR KJB301630801
Institutional research plan: CEZ:AV0Z40320502
Keywords : fergusonite * metamict state * experimental alteration * EMPA * TEM
Subject RIV: DB - Geology ; Mineralogy

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.
Permanent Link: http://hdl.handle.net/11104/0196503