Fate of trace elements during alteration of uraninite in a hydrothermal vein-type U-deposit from Marshall Pass, Colorado, USA

Deditius, Artur P.; Utsunomiya, Satoshi; Ewing, Rodney C.

doi:10.1016/j.gca.2007.08.008

Cited by 33 publications

(14 citation statements)

References 56 publications

(95 reference statements)

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“…The migration of radionuclides and other trace metals during corrosion of primary uranium minerals and uranium-bearing accessory phases is of a particular interest, because it provides information that can be used to understand the alteration of the spent nuclear fuel and other high-level radioactive wastes under oxidizing conditions and over long periods in geologic repositories. Released uranium and other trace elements could be adsorbed later by clay and feldspar minerals (Gaskova and Bukaty, 2008;Chardon et al, 2008), attenuated by phosphates (Abd El-Naby and Dawood, 2008) or precipitated as secondary mineral phases due to evaporation and chemical reactions (Deditius et al, 2007). The occurrence of several secondary minerals in the supergene zone of the study area such as kasolite, bastnaesite, synchysite, calcite and goethite signifies a history of fluid/rock interactions, radionuclides and trace elements migration and a later supergene precipitation.…”

Section: Discussionmentioning

confidence: 96%

Genesis of kasolite associated with aplite-pegmatite at Jabal Sayid, Hijaz region, Kingdom of Saudi Arabia

Dawood

Harbi

El‐Naby

2010

Journal of Asian Earth Sciences

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Section: Discussionmentioning

confidence: 96%

Genesis of kasolite associated with aplite-pegmatite at Jabal Sayid, Hijaz region, Kingdom of Saudi Arabia

Dawood

Harbi

El‐Naby

2010

Journal of Asian Earth Sciences

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“…% ThO 2 ) from hydrothermal and sedimentary occurrences (e.g. Alexandre & Kyser 2005;Deditius et al 2007). Analogous primary magmatic inclusions of uraninite in garnet have been locally described from peraluminous granites (Petrík & Konečný 2009) and granitic pegmatites (Sen et al 2009;Lima et al 2012).…”

Section: Mineral Compositionmentioning

confidence: 99%

Rare-element granitic pegmatite of Miocene age emplaced in UHP rocks from Visole, Pohorje Mountains (Eastern Alps, Slovenia): accessory minerals, monazite and uraninite chemical dating

Uher¹,

Janák²,

Konečný³

et al. 2014

Geologica Carpathica

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Abstract:The granitic pegmatite dike intruded the Cretaceous UHP rocks at Visole, near Slovenska Bistrica, in the Pohorje Mountains (Slovenia). The rock consists mainly of K-feldspar, albite and quartz, subordinate muscovite and biotite, while the accessory minerals include spessartine-almandine, zircon, ferrocolumbite, fluorapatite, monazite-(Ce), uraninite, and magnetite. Compositions of garnet (Sps [48][49] Alm [45][46] Grs +And 3-4 Prp 1.5-2 ), metamict zircon with 3.5 to 7.8 wt. % HfO 2 [atom. 100Hf/(Hf + Zr) = 3.3-7.7] and ferrocolumbite [atom. Mn/(Mn + Fe) = 0.27-0.43, Ta/(Ta + Nb) = 0.03-0.46] indicate a relatively low to medium degree of magmatic fractionation, characteristic of the muscovite -rare-element class or beryl-columbite subtype of the rare-element class pegmatites. Monazite-(Ce) reveals elevated Th and U contents ( ≤ 11 wt. % ThO 2 , ≤ 5 wt. % UO 2 ). The monazite-garnet geothermometer shows a possible precipitation temperature of ~495 ± 30 °C at P~4 to 5 kbar. Chemical U-Th-Pb dating of the monazite yielded a Miocene age (17.2 ± 1.8 Ma), whereas uraninite gave a younger (~14 Ma) age. These ages are comtemporaneous with the main crystallization and emplacement of the Pohorje pluton and adjacent volcanic rocks (20 to 15 Ma), providing the first documented evidence of Neogene granitic pegmatites in the Eastern Alps. Consequently, the Visole pegmatite belongs to the youngest rare-element granitic pegmatite populations in Europe, together with the Paleogene pegmatite occurrences along the Periadriatic (Insubric) Fault System in the Alps and in the Rhodope Massif, as well as the Late Miocene to Pliocene pegmatites in the Tuscany magmatic province (mainly on the Island of Elba).

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“…It has been demonstrated that chemical texture and geochemistry of individual uraninite grains can potentially record events of hydrothermal alteration and their effect on the compositions of uraninite (Kempe, 2003;Alexandre and Kyser, 2005;Deditius et al, 2007). In the Jaduguda deposit, standard refl ected-light microscopic investigations do not reveal any discernible optical variation in single grains of uraninite.…”

Section: Sample Location and Descriptionmentioning

confidence: 99%

Geochemistry and Chemical Dating of Uraninite in the Jaduguda Uranium Deposit, Singhbhum Shear Zone, India--Implications for Uranium Mineralization and Geochemical Evolution of Uraninite

Pal¹,

Rhede²

2013

Economic Geology

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The Jaduguda uranium deposit in the Singhbhum shear zone is the most important and best-known uranium deposit in India. Uranium mineralization is hosted in hydrothermally altered, metamorphosed, and deformed chlorite and biotite schists. Uraninite is the most abundant and ubiquitous U ore mineral in the shear zone, including the deposit at Jaduguda. The deposit is known to have undergone multiple events of hydrothermal fl uid fl ux. Integrating chemical texture, geochemistry, and in situ electron microprobe U-Th-Pb chemical dating, we aim at deciphering the geochemical and temporal evolution of uranium mineralization in the Jaduguda deposit.Geochemistry of uraninite and X-ray mapping of selected elements demonstrate that, though compositions of small uraninite grains (~10 μm) were mostly or completely modifi ed by subsequent hydrothermal alteration, the larger grains (~100 μm) locally retain the footprints of the earlier events and capture the imprints of subsequent events. In general, all analyzed uraninite grains are poor in Th (<2.5 wt % ThO2) and most grains contain detectable rare earth elements (REEs; ΣREE2O3: ~1.0-~12.5 wt %). Y and heavy rare earth elements (HREEs) are ubiquitous and most important in terms of concentrations. Based on the concentrations of U, Pb, and REEs, the Jaduguda uraninite can be classifi ed into three compositional types: group-1a with low U, high Pb, and low ΣREEs; group-1b with low U and high Pb, but high ΣREEs; and group-2 with high U, low Pb, and moderate ΣREEs. These three compositional types represent three discrete hydrothermal events. Chemical textures of uraninite indicate that the earliest recognized hydrothermal event is manifested in the formation of nearly pure uraninite (group-1a), which is depleted in REEs and other minor elements. The second hydrothermal event is characterized by Y-HREE (+ Ca + Fe) metasomatism that altered the compositions of existing uraninite, shifting its composition toward that of group-1b. The third event further modifi ed the compositions of the previous uraninite, mainly by removing part of the REEs, resulting in uraninite of group-2 composition. Using U-Th-Pb chemical ages (with a mean error of ~25 m.y.) and taking into account the effect of cation exchange on chemical age during alteration, we propose that the uranium mineralization (represented by group-1a uraninite) in the Jaduguda deposit is Paleoproterozoic in age and took place sometime circa 1.80 to 1.90 Ga. The timing of HREE metasomatism is not well constrained. However, published data and this study indicate a ~1.66 Ga age of HREE metasomatism. Based on a strong cluster of ages of group-2 uraninite, we place the latest hydrothermal event, which affected the Singhbhum shear zone in general and the Jaduguda deposit in particular, at ~1.0 Ga.

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Fate of trace elements during alteration of uraninite in a hydrothermal vein-type U-deposit from Marshall Pass, Colorado, USA

Cited by 33 publications

References 56 publications

Genesis of kasolite associated with aplite-pegmatite at Jabal Sayid, Hijaz region, Kingdom of Saudi Arabia

Genesis of kasolite associated with aplite-pegmatite at Jabal Sayid, Hijaz region, Kingdom of Saudi Arabia

Rare-element granitic pegmatite of Miocene age emplaced in UHP rocks from Visole, Pohorje Mountains (Eastern Alps, Slovenia): accessory minerals, monazite and uraninite chemical dating

Geochemistry and Chemical Dating of Uraninite in the Jaduguda Uranium Deposit, Singhbhum Shear Zone, India--Implications for Uranium Mineralization and Geochemical Evolution of Uraninite

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