Concurrent treatment of metamict and crystalline fergusonite by U, Th and Pb-rich fluids:an EMPA and TEM study
| Authors | |
|---|---|
| Year of publication | 2011 |
| Type | Article in Periodical |
| Magazine / Source | Asociation Geologica Argentina, Series D. |
| MU Faculty or unit | |
| 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. |
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