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Diagenetic clay mineral distribution in Mesoproterozoic sandstones of the Cariewerloo Basin, South Australia – implications for uranium mobilisation
Diagenetic clay mineral distribution Mesoproterozoic sandstones the Cariewerloo Basin implications uranium mobilisation
2012/3/30
A thick sequence of largely undeformed red-bed sandstones of Mesoproterozoic age, collectively termed the Pandurra Formation, overlies a wide area of crystalline basement of the central and eastern Ga...
Geochemical controls on uranium precipitation in calcrete palaeochannel deposits of Namibia
uranium hydrogeochemistry geochemical modelling Namibia
2011/11/10
Palaeo-river channels containing calcrete are important potential hosts for economic uranium mineralization in many parts of southern Africa particularly Namibia. The main feature of these deposits ar...
Geochemical controls on uranium precipitation in calcrete palaeochannel deposits of Namibia
uranium hydrogeochemistry geochemical modelling Namibia
2011/11/7
Palaeo-river channels containing calcrete are important potential hosts for economic uranium mineralization in many parts of southern Africa particularly Namibia. The main feature of these deposits ar...
Uranium and lead adsorption onto bentonite and zeolite modified with polyacrylamidoxime
Adsorption Polyacrylonitrile Composite Aluminosilicate Uranium Lead
2011/11/10
Polyacrylonitrile (PAN) and bentonite (B)/zeolite (Z)-PAN composites were prepared by direct polymerization of acrylonitrile (AN) and AN adsorbed onto B and Z. PAN and the composites were subjected to...
Sorption of uranium(VI) on Na-attapulgite as a function of contact time, solid content, pH, ionic strength, temperature and humic acid
Attapulgite U(VI) Sorption pH Ionic strength Temperature
2011/11/10
Sorption of U(VI) from aqueous solution to Na-attapulgite was investigated at different experimental chemistry conditions by using batch technique. The attapulgite sample was characterized by FTIR and...
Adsorptive removal of uranium from aqueous solution using chitosan-coated attapulgite
Chitosan Attapulgite Adsorption Uranium
2011/11/10
Chitosan-coated attapulgite beads were prepared by coating chitosan on naturally and abundantly available attapulgite, and made into spherical beads to adsorb uranium from aqueous solutions. The beads...
Adsorption of uranium(VI) onto Ulva sp.-sepiolite composite
uranium(VI) sepiolite Ulva sp.-sepiolite composite
2011/11/10
Ulva sp. and sepiolite were used to prepare composite adsorbent. The adsorption of uranium(VI) from aqueous solutions onto Ulva sp.-sepiolite has been studied by using a batch adsorber. The parameters...
Wyartite: Crystallographic evidence for the first pentavalent-uranium mineral
Wyartite:Crystallographic evidence first pentavalent-uranium mineral
2012/4/1
Determination of the structure of wyartite provides the first evidence for a pentavalent-U mineral.
5+UO ) (CO )O (OH)(H O) , Z = 4, orthorhombic, a = 11.2706(8), bThe structure of wyartite, CaU
2 2...
Bioaccumulation of metals by lichens:Uptake of aqueous uranium by Peltigera membranacea as a function of time and pH
Bioaccumulation aqueous uranium by Peltigera membranacea pH
2012/4/1
Uranium sorption experiments were carried out at ;258 C using natural samples of the lichen Peltigera membranacea. Thalli were incubated in solutions containing 100 ppm U for up to 24 h at pH values f...
Mineralogical geochemical and mechanisms of fixation under oxidizing conditions inU the vicinity of the secondary U ore deposit at Koongarra, Australia,were examined usingtransmission and scanning e...
X-Ray Identification of One-Layer Illite Varieties: Application to the Study of Illites around Uranium Deposits of Canada
Hydrothermal alteration Illite Octahedral cation distribution Polytype Uranium deposits Vacant cis-sites Vacant trans-sites
2011/12/29
Structural and diffraction criteria for distinguishing between t-1M, c-1M, m-1M, and 3T illite varieties are described. The t-1M illite corresponds to a one-layer monoclinic structure with vacant tran...
Paramagnetic Defect Centers in Hydrothermal Kaolinite from an Altered Tuff in the Nopal Uranium Deposit, Chihuahua, Mexico
Defect centers Electron paramagnetic resonance Hydrothermal Kaolinite Natural radiation
2012/1/5
Point defect centers in hydrothermal kaolinite have been investigated using electron paramagnetic resonance (EPR). Kaolinite was sampled in petrographically well-defined materials coming from uranium-...
Vanadium Chlorite from a Sandstone-Hosted Vanadium-Uranium Deposit, Henry Basin, Utah
Chlorite Chlorite/smectite Corrensite Diagenesis Tosudite Uranium Vanadium X-ray powder diffraction
2012/1/12
An unusual vanadium chlorite precipitated during the formation of a vanadium-uranium ore deposit in the Henry Basin, southeastern Utah. The ore deposit formed by reduction and precipitation of U and V...
Sorption of Uranium and Radium by Biotite, Muscovite, and Phlogopite
Anion exchange Biotite Cation exchange Muscovite Phlogopite Radium Sorption Uranium
2012/2/7
The sorption of U and Ra on finely ground biotite, muscovite, and phlogopite was adequately described by the Freundlich adsorption equation, (x/m) = KCn, at low U and Ra concentrations despite Ra prec...
Sorption of Trace Constituents from Aqueous Solutions onto Secondary Minerals. I. Uranium
Cation exchange Clinoptilolite Freundlich isotherm Glauconite Illite Montmorillonite Opal Sorption Uranium
2012/2/7
Well-characterized American Petroleum Institute clay standards, source clays from The Clay Minerals Society, and other secondary minerals were used to determine the effects of U concentration, tempera...