Naslov
Meta-autunite in pegmatites from Baixo dos Quintos, Brazil

Autori
Bermanec, Vladimir ; Wegner, Reinhard ; Kniewald, Goran ; Palinkaš, Ladislav ; Rajić, Maša ; Sultan Syed Abbas

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
11th International Association on the Genesis of Ore Deposits (IAGOD) Quadrennial Symposium in Association with GEOCONGRESS 2002 : Earth Systems and Metallogensis : Extenden Abstracts / - Windhoek : Geological Survey of Namibia, 2002, 20-20

Skup
11th International Association on the Genesis of Ore Deposits (IAGOD) Quadrennial Symposium in Association with GEOCONGRESS 2002 : Earth Systems and Metallogensis

Mjesto i datum
Windhoek, Namibija, 22.07.2002. - 26.07.2002

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
pegmatite; 238U/235U; meta-atunite

Sažetak
Meta-autunite in pegmatites from Baixo dos Quintos, Brazil was investigated. The total uranium content, the 238U/235U isotopic ratio and major and trace element constituent analysis were done by ICP-OES and ICP-MS. Unit cell dimensions (a=6.990(1)A, c=8.454(1)A and V=413.l (l)A3 ) were calculated from X-ray diftraction data. Thermal analysis showed a weight . loss of 16.03 wt.% in four distinct processes up to 1500°C. The meta-autunite has the following formula: (Ca0.808Ba0.032Sr0.030Mg0.011Na0.011Al0.032) Σ 1.015(UO2)2(P1.988As0.008Bi0.004( x 2H2O and has a near to natural isotopic ratio of 238U/235U.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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