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Journal articles on the topic 'Uranite'

Author: Grafiati

Published: 4 June 2021

Last updated: 27 July 2025

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1

Yuan, Feng, Shao-Yong Jiang, Jiajun Liu, et al. "Geochronology and Geochemistry of Uraninite and Coffinite: Insights into Ore-Forming Process in the Pegmatite-Hosted Uraniferous Province, North Qinling, Central China." Minerals 9, no. 9 (2019): 552. http://dx.doi.org/10.3390/min9090552.

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The biotite pegmatites in the Shangdan domain of the North Qinling orogenic belt contain economic concentrations of U, constituting a low-grade, large-tonnage pegmatite-hosted uraniferous province. Uraninite is predominant and ubiquitous ore mineral and coffinite is common alteration mineral after initial deposit formation. A comprehensive survey of the uraninite and coffinite assemblage of the Chenjiazhuang, Xiaohuacha, and Guangshigou biotite pegmatites in this uraniferous province reveal the primary magmatic U mineralization and its response during subsequent hydrothermal events. Integratin

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2

Ding, Weixuan, Johannes A. Botha, Bruce C. Hanson, and Ian T. Burke. "Synthesis of Calcium Monouranate Particles via an Aqueous Route." MRS Advances 1, no. 62 (2016): 4123–29. http://dx.doi.org/10.1557/adv.2017.199.

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ABSTRACTLarge stores of unstable waste uranic materials such as fluorides or nitrates exist internationally due to legacy civil nuclear enrichment activities. Conversion of these uranic materials to layered metal uranates prior to disposal is possible via aqueous quench - precipitation type reactions. Previous studies1 have shown facile in-situ formation of geologically persistent and labile uranate colloids2 under simulated nuclear waste repository conditions, though the effects of local solution metal-uranium ratios on uranate stoichiometry have yet to be covered. This affects our understand

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3

MIERCZYK, Zygmunt, Andrzej GIETKA, Łukasz OSUCHOWSKI, and Tomasz SZYMCZAK. "Concrete structures with polymer sulfur." Inżynieria Bezpieczeństwa Obiektów Antropogenicznych, no. 1 (March 31, 2025): 126–40. https://doi.org/10.37105/iboa.259.

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The article presents the results of physical-structural, chemical, mechanical and radiation attenuation measurements g conducted for various concrete structures with polymer sulfur. A scanning electron microscope and the LIBS system – the method of atomic emission spectroscopy with laser excitation – were used for structural and chemical composition studies. Tests of mechanical properties were carried out on an Instron 8862 testing machine, while the determination of the absorption coefficient of radiation g was carried out in a measuring system with sources: 137Cs and 60Co, as well as natural

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4

Matar, Samir F. "Ab-initio Studies of the Electronic Structures of the Hexavalent Uranium Compounds K2UO4 and Na4UO5." Zeitschrift für Naturforschung B 69, no. 1 (2014): 109–15. http://dx.doi.org/10.5560/znb.2014-3280.

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Band theoretical results within the density functional theory are reported for the uranates K2UO4 and Na4UO5. The two structures are differentiated respectively by uranyl and reverse uranyl-type short U-O distances characterizing the UO6 octahedra, as also reflected by larger compressibility and stability of the potassium-based uranate derived from energy-volume equations of states and the cohesive energy. A larger ionic character of Na4UO5 is inferred from comparative Bader charge analyses. The two uranates are insulators with a larger band gap and less extended valence and conduction bands f

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5

Wang, Jian, Zhanxue Sun, Guangrong Li, et al. "Geochemistry and Acid Hydrometallurgy Accessibility of Uraninite from Mianhuakeng Granite-Hosted Uranium Deposit, South China." Minerals 10, no. 9 (2020): 747. http://dx.doi.org/10.3390/min10090747.

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Systematic study of the surface chemical properties of uranium minerals is necessary to improve the uranium ore extracting process. The presented work aims to argue geochemistry and acid hydrometallurgy accessibility of uraninite from the Mianhuakeng (MHK) granite-hosted uranium deposit, South China, which provides insight on this ore extracting domain. Mineralogy, geochemical composition, U–Th–Pb chemical age, and uranium deportment of the uraninite were systematically analyzed by using scanning electron microscope with energy dispersion spectrum (SEM-EDS), an electron probe microanalyzer (EP

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6

Yu, Chi-Da, Kai-Xing Wang, Xiao-Dong Liu, et al. "Uranium Mineralogical and Chemical Features of the Na-Metasomatic Type Uranium Deposit in the Longshoushan Metallogenic Belt, Northwestern China." Minerals 10, no. 4 (2020): 335. http://dx.doi.org/10.3390/min10040335.

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The Longshoushan Metallogenic Belt (northwestern China) is known for its word-class Jinchuan Ni-Cu sulfide (Pt) deposit and is also an important uranium metallogenic belt. The Jiling uranium deposit in this belt is a typical Na-metasomatic uranium deposit, which rarely occurs in China. Mineralization in the Jiling uranium deposit is hosted in granitoids that have suffered a Na-metasomatic alteration. There are three kinds of uranium minerals, including uraninite, pitchblende, and coffinite in the Jiling uranium deposit. Pitchblende is the predominant uranium mineral. Integrating the mineralogy

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7

Parnell, John. "Petrographic relationships between mineral phases and bitumen in the Oklo Proterozoic natural fission reactors, Gabon." Mineralogical Magazine 60, no. 401 (1996): 581–93. http://dx.doi.org/10.1180/minmag.1996.060.401.04.

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AbstractSeveral of the Proterozoic natural fission reactors at Oklo, Gabon contain abundant organic matter (bitumen), with which much of the reactor uranium is associated. An understanding of the petrography of the bitumen is important in assessing its role in element retention following fissiogenic reactions. The bitumen is replacive and includes vestiges of detrital grains and clays of the host sandstones. It also contains several generations of mineral phases related to the migration of uranium and daughter lead, and other elements mobilized by hydrothermal activity in the reactor zones. Th

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8

Xu, Zhengqi, Minghui Yin, Youliang Chen, et al. "Genesis of Megacrystalline Uraninite: A Case Study of the Haita Area of the Western Margin of the Yangtze Block, China." Minerals 11, no. 11 (2021): 1173. http://dx.doi.org/10.3390/min11111173.

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Megacrystalline uraninite (up to one centimeter in size) represents one of the most important discoveries in uranium mineralogy in the western margin of the Yangtze Block and even in China in recent years. However, the genesis of megacrystalline uraninite remains controversial. In this study, the megacrystalline uraninite found in the felsic and quartz veins in the Haita area is examined for the first time. The study examined the geochemical characteristics of uraninite in the two veins and resulted in two primary findings. (1) The genesis of the uraninite was likely intrusive and was closely

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9

Weber, Karrie A., J. Cameron Thrash, J. Ian Van Trump, Laurie A. Achenbach, and John D. Coates. "Environmental and Taxonomic Bacterial Diversity of Anaerobic Uranium(IV) Bio-Oxidation." Applied and Environmental Microbiology 77, no. 13 (2011): 4693–96. http://dx.doi.org/10.1128/aem.02539-10.

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ABSTRACTMicroorganisms in diverse terrestrial surface and subsurface environments can anaerobically catalyze the oxidative dissolution of uraninite. While a limited quantity (∼5 to 12 μmol liter−1) of uranium is oxidatively dissolved in pure culture studies, the metabolism is coupled to electron transport, providing the potential of uraninite to support indigenous microbial populations and to solubilize uranium.

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10

Cruz, Juncal A., Ismael Coronado, Montserrat Ferrer-Juliá, et al. "Caracterización de minerales de uranio con espectroscopía de reflectancia de laboratorio: estudio del yacimiento de fósiles de Córcoles, Guadalajara." Geogaceta 72 (December 11, 2022): 55–58. http://dx.doi.org/10.55407/geogaceta98436.

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En la naturaleza, el ion uranilo se asocia comúnmente a arseniatos, fosfatos y vanadatos; uno de los orígenes secundarios másfrecuentes del uranio está asociado a fosfatos cálcicos biogénicos. En este estudio se han caracterizado minerales de uranio con espectroscopia de reflectancia VNIR-SWIR de laboratorio (400-2500 nm). Entre las muestras estudiadas se han incluido los minerales secundarios de uranio: metatorbernita, metautunita y metauranocircita, así como fosfatos cálcicos (biogénicos e inorgánicos) y fósiles coexistentes con mineralizaciones de metatyuyamunita encontrados en el yacimient

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11

Huang, Guangwen, Dehai Wu, Furong Li, Chunrong Pan, Pengfei Fan, and Zhuang Min. "The Yanshanian Uranium Mineralization Age and Its Geological Significance in the Dashigou Carbonatite-Type Mo-REE-U Deposit, East Qinling Orogen, China." Minerals 14, no. 9 (2024): 928. http://dx.doi.org/10.3390/min14090928.

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The Dashigou deposit is one of the most representative carbonatite-type Mo-REE deposits in the East Qinling metallogenic belt of China, with a molybdenum resource of more than 180 kt and a rare earth resource of 37.8 kt. Recent exploration has revealed a considerable scale of uranium mineralization within this deposit. Therefore, this study conducted detailed mineralogical and EPMA U-Th-Pb chemical dating on the uranium mineralization in the Dashigou deposit. The results indicate that the U-ore body in the Dashigou deposit mainly consists in carbonatite veins, and principally as anhedral, mesh

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12

René, Miloš, Zdeněk Dolníček, Jiří Sejkora, Pavel Škácha, and Vladimír Šrein. "Uraninite, Coffinite and Ningyoite from Vein-Type Uranium Deposits of the Bohemian Massif (Central European Variscan Belt)." Minerals 9, no. 2 (2019): 123. http://dx.doi.org/10.3390/min9020123.

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Uraninite-coffinite vein-type mineralisation with significant predominance of uraninite over coffinite occurs in the Příbram, Jáchymov and Horní Slavkov ore districts and the Potůčky, Zálesí and Předbořice uranium deposits. These uranium deposits are hosted by faults that are mostly developed in low- to high-grade metamorphic rocks of the basement of the Bohemian Massif. Textural features and the chemical composition of uraninite, coffinite and ningyoite were studied using an electron microprobe. Collomorphic uraninite was the only primary uranium mineral in all deposits studied. The uraninite

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13

Corcoran, Loretta, and Antonio Simonetti. "Geochronology of Uraninite Revisited." Minerals 10, no. 3 (2020): 205. http://dx.doi.org/10.3390/min10030205.

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Identification of uraninite provenance for the purpose of nuclear forensics requires a multifaceted approach. Various geochemical signatures, such as chondrite normalized rare earth element patterns, help identify and limit the potential sources of uraninite based on the geological setting of the uranium ore mineralization. The inclusion of accurate age determinations to discriminate geochemical signatures for natural uranium ores may help to potentially restrict geographical areas for provenance consideration. Determining a robust age for uraninite formation is somewhat difficult, due to well

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14

Wu, Bin, Christophe Bonnetti, Yue Liu, et al. "Uraninite from the Guangshigou Pegmatite-Type Uranium Deposit in the North Qinling Orogen, Central China: Its Occurrence, Alteration and Implications for Post-Caledonian Uranium Circulation." Minerals 11, no. 7 (2021): 729. http://dx.doi.org/10.3390/min11070729.

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The Guangshigou deposit is the largest pegmatite-type uranium deposit in the Shangdan domain of the North Qinling Orogenic Belt, which is characterized by the enrichment of uraninite hosted in biotite granitic pegmatites. At Guangshigou, uraninite commonly occurs as mineral inclusions in quartz, K-feldspar and biotite or in interstices of these rock-forming minerals with magmatic characteristics (e.g., U/Th < 100, high ThO2, Y2O3 and REE2O3 contents and low concentrations of CaO, FeO and SiO2). It crystallized at 407.6 ± 2.9 Ma from fractionated calc-alkaline high-K pegmatitic melts under c

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15

Philippe, S., J. R. Lancelot, N. Clauer, and A. Pacquet. "Formation and evolution of the Cigar Lake uranium deposit based on U–Pb and K–Ar isotope systematics." Canadian Journal of Earth Sciences 30, no. 4 (1993): 720–30. http://dx.doi.org/10.1139/e93-058.

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A systematic geochronological study was conducted on the Cigar Lake uranium deposit. U–Pb and Pb–Pb systematics were applied to different types of uranium ore, and various associated sheet silicates were dated by the K–Ar method. These two approaches define a widespread retrograde metamorphic event in the basement, which occurred at about 1780 Ma during the Hudsonian orogeny, and a four-stage evolutionary model for the ore deposit. This model is compatible with the history of other unconformity-type, uranium deposits in the Athabasca Basin.The first stage in the evolution of the Cigar Lake ura

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16

Landry, Kerstin, Erin Adlakha, Andree Roy-Garand, et al. "Uranium Mineralization in the MacInnis Lake Area, Nonacho Basin, Northwest Territories: Potential Linkages to Metasomatic Iron Alkali-Calcic Systems." Minerals 12, no. 12 (2022): 1609. http://dx.doi.org/10.3390/min12121609.

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The intracratonic Paleoproterozoic Nonacho Basin, deposited on the western margin of the Rae craton, contains historic polymetallic (i.e., U, Cu, Fe, Pb, Zn, Ag) occurrences spatially associated with its unconformable contact with underlying crystalline basement rocks and regionally occurring faults. This study presents the paragenesis, mineral chemistry and geochemistry of uranium mineralized rocks and minerals of the MacInnis Lake sub-basin of the Nonacho Basin, to evaluate the style and relative timing of uranium mineralization. Mineralization is restricted to regionally occurring deformati

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17

Barbin, N. M., A. M. Kobelev, D. I. Terent’ev, S. G. Alexeev, and S. A. Titov. "Thermodynamic simulation of radioactive graphite combustion in water vapor." Journal of Physics: Conference Series 2233, no. 1 (2022): 012002. http://dx.doi.org/10.1088/1742-6596/2233/1/012002.

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Abstract The paper analyzes the gas phase, the behavior uranium, the calculation of thermophysical properties during heating of nuclear reactor graphite containing various actinides. The study was carried out by thermodynamic modeling using the TERRA software package in the range from 423 to 2123 K at a constant pressure of 0.1 MPa. Up to a temperature of 623 K, the main components of the gas phase are water vapor, carbon dioxide, methane and hydrogen. Above 1023 K, the gas phase contains predominantly carbon dioxide and monoxide. It was revealed that in the range of 423-923 K uranium is prese

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18

Barbin, N. M., A. M. Kobelev, D. I. Terent’ev, S. G. Alexeev, and S. A. Titov. "Thermodynamic simulation of radioactive graphite combustion in water vapor." Journal of Physics: Conference Series 2233, no. 1 (2022): 012002. http://dx.doi.org/10.1088/1742-6596/2233/1/012002.

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Abstract The paper analyzes the gas phase, the behavior uranium, the calculation of thermophysical properties during heating of nuclear reactor graphite containing various actinides. The study was carried out by thermodynamic modeling using the TERRA software package in the range from 423 to 2123 K at a constant pressure of 0.1 MPa. Up to a temperature of 623 K, the main components of the gas phase are water vapor, carbon dioxide, methane and hydrogen. Above 1023 K, the gas phase contains predominantly carbon dioxide and monoxide. It was revealed that in the range of 423-923 K uranium is prese

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19

Haryati, Iis, Boybul Boybul, and Sutri Indaryati. "Pengaruh unsur AI dan Mo terhadap hasil analisis uranium dalam pelat elemen bakar U-Mo/AI." Jurnal Forum Nuklir 5, no. 2 (2011): 107. http://dx.doi.org/10.17146/jfn.2011.5.2.3331.

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Pengaruh unsur AI dan Mo terhadap hasil analisis uranium dalam pelat elemen bakar U-Mo/AI. Telah dilakukan analisis kadar uranium dalam larutan uranil nitrat hasil pelarutan pelat elemen bakar (PEB) U- Mo/AI. Penentuan kadar uranium menggunakan metode potensiometri titrasi reduksi oksidasi dengan fero sulfat sebagai reduktor dan kalium bikromat sebagai oksidator. Pengaruh aluminium di dalam uranil nitrat diteliti pada konsentrasi 500, 1000, 1500, 2000, 2500,3000 dan 5000 ppm, sedangkan pengaruh Mo diteliti pada konsentrasi 50, 100, 200, 300, 400, 500 dan 1000 ppm dengan konsentrasi uranium 100

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20

Cheng, Long, Chengjiang Zhang, Hao Song, and Qian Cheng. "In-Situ LA-ICP-MS Uraninite U–Pb Dating and Genesis of the Datian Migmatite-Hosted Uranium Deposit, South China." Minerals 11, no. 10 (2021): 1098. http://dx.doi.org/10.3390/min11101098.

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The Datian uranium deposit is a migmatite-hosted, high temperature, hydrothermal deposit in the Kangdian region. Detailed information on the chemical composition and formation age of the uraninite remains lacking, which impedes our understanding of uraninite genesis. Two phases of uraninite have been identified according to their relationships with other minerals and their field relationships. The phase 1 (Ur1) uraninite is characterized by local development of microfractures and pores in the crystal of uraninite, a scattered distribution, and irregular crystal shapes, and it is associated wit

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21

Sun, Jiaxing, Deyou Sun, Jun Gou, et al. "Origin of the Kunduleng Granite and Its Associated Uranium Anomaly in the Southern Great Xing’an Range, NE China." Minerals 14, no. 7 (2024): 666. http://dx.doi.org/10.3390/min14070666.

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The Kunduleng granite hosts one of several significant uranium anomalies within the southern Great Xing’an Range, NE China. Whole-rock geochemistry and mineral chemistry data, along with the zircon U-Pb-Hf isotope have been used to constrain the petrogenesis of this granitic intrusion and the origin of the uranium anomaly. Microscopically, quartz, alkali-feldspar, and plagioclase are the essential mineral constituents of the granite, with minor biotite, while monazite, apatite, xenotime, and zircon are accessory minerals. Geochemically, the silica- and alkali-rich granites show a highly fracti

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22

Haryati, Iis, Boybu Boybu, and Sutri Indaryati. "PENGARUH UNSUR AL DAN MO TERHADAP HASIL ANALISIS URANIUM DALAM PELAT ELEMEN BAKAR U-MO/AI DENGAN METODE POTENSIOMETRI." Jurnal Forum Nuklir 8, no. 1 (2014): 12. http://dx.doi.org/10.17146/jfn.2014.8.1.3477.

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PENGARUH UNSUR Al DAN Mo TERHAOAP HASIL ANALISIS URANIUM DALAM PELAT ELEMEN BAKAR U-Mo/Al. Telah dilakukan analisis kadar uranium dalam larutan uranil nitrat hasil pelarutan pelat elemen bakar (PEB) U-Mo/AI. Penentuan kadar uranium menggunakan metode potensiometri titrasi reduksi oksidasi dengan fero sulfat sebagai reduktor dan kalium bikromat sebagai oksidator. Pengaruh aluminium di dalam uranil nitrat diteliti pada konsentrasi 500, 1000, 1500. 2000, 2500, 3000. dan 5000 ppm, sedangkan pengaruh Mo diteliti pada konsentrasi 50, 100, 200, 300,400. 500, dan 1000 ppm dengan konsentrasi uranium 10

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23

Suzuki, Yohey, Shelly D. Kelly, Kenneth M. Kemner, and Jillian F. Banfield. "Microbial Populations Stimulated for Hexavalent Uranium Reduction in Uranium Mine Sediment." Applied and Environmental Microbiology 69, no. 3 (2003): 1337–46. http://dx.doi.org/10.1128/aem.69.3.1337-1346.2003.

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ABSTRACT Uranium-contaminated sediment and water collected from an inactive uranium mine were incubated anaerobically with organic substrates. Stimulated microbial populations removed U almost entirely from solution within 1 month. X-ray absorption near-edge structure analysis showed that U(VI) was reduced to U(IV) during the incubation. Observations by transmission electron microscopy, selected area diffraction pattern analysis, and energy-dispersive X-ray spectroscopic analysis showed two distinct types of prokaryotic cells that precipitated only a U(IV) mineral uraninite (UO2) or both urani

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René, Miloš. "Alteration of Granitoids and Uranium Mineralization in the Blatná Suite of the Central Bohemian Plutonic Complex, Czech Republic." Minerals 10, no. 9 (2020): 821. http://dx.doi.org/10.3390/min10090821.

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The Bohemian magmatic complex belongs to granitoid plutons of the Central European Variscides. Hydrothermal uranium mineralization evolved in the small uranium deposits Nahošín and Mečichov is associated with N–S shear zones occurring on the SW margin of the Central Bohemian plutonic complex formed by amphibole-bearing biotite granodiorites of the Blatná suite. The purpose of presented study is description of uranium mineralization bounded on brittle shear zones, which is coupled with intense low-temperature hydrothermal alteration of granitic rocks. Uranium mineralization, formed predominantl

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Pi-Puig, Teresa, Jesús Solé, and Leticia Alba-Aldave. "Uranium in Fluorite, a Case Study: The La Azul Fluorspar Deposit, Taxco, Guerrero, Mexico." Minerals 13, no. 12 (2023): 1495. http://dx.doi.org/10.3390/min13121495.

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Uranium can be found in the Earth’s crust in different reservoirs, with igneous rocks being the primary source of this element from which many types of secondary deposits are formed. Fluorspar deposits generally do not contain uranium, but in some cases, fluorite can carry both uranium in solid solutions and inclusions of uranium minerals. We studied the concentration (ICP-MS), composition (electronic microprobe), and spatial distribution (microscopy and auto-radiography) of elemental uranium and uranium minerals at different scales (microscopy and auto-radiography in fluorite from the La Azul

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Krishna Rao, N., T. S. Sunilkumar, and D. Narasimhan. "Uraniferous Organic Matter in the Sandstone-Type Uranium Ore from Domiasiat, Meghalaya, India." Journal Geological Society of India 45, no. 4 (1995): 407–25. http://dx.doi.org/10.17491/jgsi/1995/450404.

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Abstract Uranium in the sandstone-hosted uranium deposit at Domiasiat, Meghalaya is mainly associated with organic matter (OM), which is also enriched in several trace elements, viz. Zn, Pb, Ni, V, Co, Ba, Sn, Mo, Cr, Ag, P etc. This paper is an attempt to characterize and discuss the origin of the OM and the associated uranium. The OM occurs in several forms - lumps, layers, veins, dispersions, fracture fillings, coatings and impregnations. Based on structural features and optical properties, seven types of OM are identified. The structural and compositional features indicate that the OM is t

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Havelcová, Martina, Ivana Sýkorová, Miloš René, et al. "Geology and Petrography of Uraniferous Bitumens in Permo-Carboniferous Sediments (Vrchlabí, Czech Republic)." Minerals 12, no. 5 (2022): 544. http://dx.doi.org/10.3390/min12050544.

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Uraniferous bitumens found in black shales from the Permian rocks at Vrchlabí in the Krkonoše Piedmont Basin (Czech Republic) were described and characterized petrologically and mineralogically. The Permian sediments originated from weathering products in metasediments and granitoids of the Krkonoše–Jizera and Orlice–Sněžník crystalline complexes. The organic matter contained up to 4.8 wt.% uranium, as uraninite grains. Elements associated with uraninite, such as Pb, Zr, Cu, and As, may have accumulated from epigenetic fluids in layers rich in organic matter during their late diagenesis. The b

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Goyal, Navin, Siby K. Varughese, P. K. Hansda, S. Ramachandran, and Rajendra Singh. "Geochemistry of Granites of Jamhughoda, Panchmahals District, Gujarat and Uranium Mineralization in Champaner Group." Journal Geological Society of India 50, no. 6 (1997): 769–78. http://dx.doi.org/10.17491/jgsi/1997/500614.

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Abstract The Precambrian Champaner Group of rocks are intruded by Godhra granites in Jambughoda area. Significant uranium mineralisation has been located in the fractures in the dolomitic limestone of Lower Champaners with uraninite occurring as the primary uranium mineral. The geochemical features observed for the granites suggest that the granite melt, originated by the partial melting of relatively silicic crust, was further modified by fractionation processes during which uranium was concentrated in the late magmatic and subsequent hydrothermal fluids. The Champaner deformation resulted in

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Togaev, Isomiddin, Baxtinur Abdujabborov, and Shoxrux Toshtemirov. "Geological structure of Ustuk ore field features of mining." E3S Web of Conferences 420 (2023): 04019. http://dx.doi.org/10.1051/e3sconf/202342004019.

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The article provides information on mineralization of the Ustuk mineral field with uranium and other rare metals.The distribution of radioactive elements in rocks was studied in field studies. As a result of the research, it was found that uranium-rich vanadium mineralization and secondary minerals of carnotite-tyuyamunite series were formed. Also, the primary minerals of uranium and rare earth elements were enriched with uranium and rare earth elements in the metamorphic quartzization front. A favorable environment (geochemical barrier) for quartzization of skarnoids was created and mineral d

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Mustoe, George E. "Uranium Mineralization of Fossil Wood." Geosciences 10, no. 4 (2020): 133. http://dx.doi.org/10.3390/geosciences10040133.

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Uraniferous sandstone deposits commonly resulted when uranium in groundwater precipitated in reducing environments caused by degradation of ancient wood and organic debris. However, the mineralogy of uranium in fossil wood has received relatively little study. Previous microscopic observations of petrified wood from a few uranium mines have demonstrated that uranium in fossil wood primarily involves the oxide mineral uraninite or the silicate mineral coffinite, often in association with metal sulfides such as chalcopyrite. These observations are applicable to primary ore zones that are located

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Wang, Xin Yu, Shi Jun Ni, and Ze Ming Shi. "Predominance Diagrams of Dissolved Uranium Species and logfO₂(g)-pH Diagrams of U-PO₄^3--Nacl-H₂O System at 25°C, PCO₂=10^-3.5 Mpa." Advanced Materials Research 781-784 (September 2013): 3–8. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.3.

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To explore the effect of logfO2(g), pH, uranium concentration, phosphate concentration and NaCl concentration on the predominance diagrams of dissolved uranium species and formation of solid phases containing uranium in the U-PO43--NaCl-H2O system at 25 °CandPCO2=10-3.5MPa, the thermodynamic model of this system was constructed. Based on the results of calculation, the logfO2(g)-pH diagrams were drawn. It can be found that: 1) the formation of uraninite needed enough reductive condition (about logfO2(g) < -50 ), while the formation of Na-Autunite needed the strict pH range (5<pH<8) in

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Čenčur Curk, Barbara. "Tracer test on the Dragonja landfill." Geologija 63, no. 2 (2020): 193–201. http://dx.doi.org/10.5474/geologija.2020.016.

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The paper presents the results of a tracer experiment with the uranine tracer at the non-hazardous landfill of Dragonja. The purpose of the tracer test was to determine the dynamics of the potential pollutants from the landfill to the groundwater. The landfill lies on the thicker weathered layer of flysch rock that forms the slope of the hill. At the foot of the hill are silty clay and partly sandy alluvial sediments of the Dragonja River. The transport of uranine depends on the intensity and duration of precipitation, potential evapotranspiration, permeability, precipitation infiltration into

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Goliáš, Viktor, Gereltsetseg Tumurkhuu, Pavel Kohn, et al. "Construction of new houses on a uranium vein outcrop: a case study from the Czech Republic." Nukleonika 61, no. 3 (2016): 343–49. http://dx.doi.org/10.1515/nuka-2016-0057.

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Abstract Significant uranium mineralization represented by a typical assemblage of uranyl supergene minerals in a quartz-uraninite vein hosted in the exocontact zone of the Variscan-Tanvald granite was found at a new construction site in the municipality of Jablonec n. Nisou. Activities of 222Rn in soil gas reached 1 MBq/m3 around two houses, with a maximum of 3.33 MBq/m3 between them on a uranium ore lens outcrop. The uranium content reaches up to 291 ppm eU (3595 Bq/kg 226Ra), and it is possible to find many ‘hot’ pieces of uranium ore fragments with a high percentage of uranium in the Quate

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Carl, C., E. von Pechmann, A. Höhndorf, and G. Ruhrmann. "Mineralogy and U/Pb, Pb/Pb, and Sm/Nd geochronology of the Key Lake uranium deposit, Athabasca Basin, Saskatchewan, Canada." Canadian Journal of Earth Sciences 29, no. 5 (1992): 879–95. http://dx.doi.org/10.1139/e92-075.

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The Key Lake deposit is one of several large, high-grade, unconformity-related uranium deposits located at the eastern margin of the Athabasca Basin in northern Saskatchewan, Canada. The deposit consists of the Gaertner orebody, now mined out, and the Deilmann orebody, which is presently being mined. In the past, radiometric dating efforts yielded an age of oldest ore-forming event of 1250 ± 34 Ma at the Gaertner orebody and 1350 ± 4 Ma at the Deilmann orebody. This unlikely age difference called for further investigation. Innovative preparation techniques were used to separate the paragenetic

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35

Kaulina, Tatiana, Lyudmila Lyalina, Vadim Kamenetsky, Vadim Il’chenko, Vladimir Bocharov, and Maria Gannibal. "Composition and Structure of Zircon from Hydrothermal Uranium Occurrences of the Litsa Ore Area (Kola Region, Russia)." Geosciences 10, no. 8 (2020): 278. http://dx.doi.org/10.3390/geosciences10080278.

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Zircon grains from various metagranitoids (plagio- and monzo-granites, gneisses, metasomatic rocks, and pegmatoid veins) from the Skal’noe and Dikoe sites of the Litsa uranium ore area (Kola Region, Russia) were studied in order to reconstruct the sequence and timing of events in the area and to observe effects of hydrothermal process related to uranium mineralization on structure and composition of zircon. Individual zircon grains were studied by means of laser ablation inductively coupled plasma mass spectrometry (LA–ICPMS), ion microprobe and Raman spectroscopy. Isotopic LA–ICPMS data for t

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Boetzkes, Amanda, and Jeff Diamanti. "Geofetishism and the Tender Violence of Rare Earths." SubStance 52, no. 3 (2023): 9–30. http://dx.doi.org/10.1353/sub.2023.a913888.

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Abstract: This article addresses the geospeculation of Kuannersuit, a mountain in southwest Greenland that holds a major deposit of rare earth minerals, including uranium. Through the concepts of “geofetishism” and “tender violence,” we consider the history of mineral speculation in Greenland, and how its colonial history bears on the now independent (Inuit) Greenlandic government, and the township of Narsaq. With a focus on the anti-uranium activist group, Urani? Naamik! , we show the challenges posed to Greenlanders in their resistance to the mobilization of their mineral resources by the Au

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Il’chenko, Vadim, Elena Afanasieva, Tatiana Kaulina, Lyudmila Lyalina, Elena Nitkina, and Olga Mokrushina. "Litsa uranium ore occurrence (Arctic zone of the Fennoscandian Shield): new results of petrophysical and geochemical studies." Записки Горного института 255 (July 26, 2022): 393–404. http://dx.doi.org/10.31897/pmi.2022.44.

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Mineralogical, petrophysical and geochemical studies have been carried out to determine the sequence and formation conditions of uranium mineralization within the Litsa ore occurrence (Kola Region). Mineralogical studies show the following formation sequence of ore minerals: uraninite – sulfides – uranophane, coffinite, pitchblende. Two stages of uranium mineralization are distinguished: Th-U (1.85-1.75 Ga) and U (400-300 Ma). The distribution of physical properties of rocks in the area is consistent with the presence of two temporal stages in the formation of mineralization with different dis

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Yaroshchuk, M., O. Vaylo, and A. Ganevich. "PROSPECTS OF URANIUM MINERALIZATION OF THE SOUTH-WESTERN SLOPE OF THE UKRAINIAN SHIELD." Geochemistry of Technogenesis 6, no. 34 (2021): 82–89. http://dx.doi.org/10.15407/geotech2021.34.082.

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The geological position, composition and genesis of uranium mineralization of ore occurrences on the southwestern slope of the Ukrainian Shield are considered. In the Precambrian basement metamorphic rocks of the Dniester-Bug, Bug and ultrametamorphic rocks of the Golovanev, Pobuzh, Berdichev and Kirovograd complexes were established. On the southwestern slope of the Ukrainian Shield, 4 uranium occurrences and 4 radioactive anomalies have been discovered, studied and prospected. The uranium occurrences are localized along the regional unconformity surface of the Precambrian basement and platfo

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Bloch, P., and I. M. Shapiro. "Assaying Depleted Uranium in Bones In-Situ Using A Non-Invasive X-Ray Fluorescence Technique." Advances in X-ray Analysis 38 (1994): 595–99. http://dx.doi.org/10.1154/s0376030800018280.

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Abstract The occupational exposure to uranium associated with milling and fabrication of depleted uranium is presently assessed from bioassay of urine samples. The evaluation of the body-burden of uraninm from urine analysis has many difficulties and uncertainties associated with accounting for the bio-transport of inhaled uranium psrticles from the lungs, to absorption in the blood and excretion through the kidneys. The chemical toxicity of uranium and other transuranic elements is not fully understood, partially because of the difficulty of assessing the body burden of these metals in-situ.

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Kanayev, Ashimkhan T., Khussain Valiyev, and Aleksandr Bulaev. "Uranium Bioleaching from Low Grade Ore." Materials Science Forum 989 (May 2020): 559–63. http://dx.doi.org/10.4028/www.scientific.net/msf.989.559.

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The goal of the present work was to perform bioleaching of uranium from low grade ore from Vostok deposit (Republic of Kazakhstan), which was previously subjected to long-term acid leaching. The ore initially contained from 0.15 to 0.20% of uranium in the form of uraninite, but ore samples used in the study contained about 0.05% of uranium, as it was exhausted during acid leaching, and uranium was partially leached. Representative samples of ore were processed in 1 m columns, leach solutions containing 5, 10, 20 g/L of sulfuric acid and bacterial cells (about 104) were percolated through the o

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Sukadana, I. Gde, and Heri Syaeful. "Evaluasi Sistem Pengendapan Uranium Pada Batuan Sedimen Formasi Sibolga, Tapanuli Tengah." EKSPLORIUM 37, no. 2 (2016): 125. http://dx.doi.org/10.17146/eksplorium.2016.37.2.3112.

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ABSTRAKUranium di alam dapat terbentuk dalam berbagai tipe cebakan, sesuai dengan sumber, proses, dan lingkungan pengendapannya. Keterdapatan uranium di Sibolga pada batuan sedimen Formasi Sibolga merupakan suatu potensi yang layak untuk dikembangkan tetapi hingga saat ini belum diketahui pola pengendapan dan proses mineralisasi uranium tersebut. Penelitian bertujuan untuk mengetahui pola sebaran batuan dan keterdapatan anomali kadar uranium berdasarkan data geologi, radiometri permukaan, dan data log bor untuk mengetahui proses pengendapan batuan dan mineralisasi uranium. Keterdapatan mineral

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Lii, Kwang-Hwa. "High-T, High-P Hydrothermal Synthesis of Uranium Silicates and Germanates." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C759. http://dx.doi.org/10.1107/s2053273314092407.

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Most uranium minerals can be classified as oxidized species in which U is fully oxidized to U(VI), and reduced species, in which U occurs primarily as U(IV). Uranyl silicates are an important group of uranium(VI) minerals in the altered zones of many uranium deposits [1]. Uranyl silicates have also received attention because they form when spent nuclear fuel interacts with water containing silicon under oxidizing conditions. One naturally occurring uranium(IV) silicate exists, namely coffinite (USiO4), which is the most important ore mineral for uranium after uraninite. Numerous synthetic uran

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Thorpe, Richard S., Andrew G. Tindle, and Olwen Williams-Thorpe. "Radioelement distribution in the Tertiary Lundy granite (Bristol Channel, UK)." Geological Magazine 132, no. 4 (1995): 413–25. http://dx.doi.org/10.1017/s0016756800021476.

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AbstractThe radioelement distribution and content of the Lundy granite, a coarse-grained megacrystic granite of Tertiary age, has been measured using a portable gamma-ray spectrometer in order to assess fractionation and alteration processes in the granite. Results indicate a systematic variation of K, Th and U (with a few notable exceptions) that follows a partially concentric distribution to lower concentrations inland. The plateau region of the island (particularly the southern half) is relatively depleted in all radioelements. Over the island, measurements of K vary from 1.3–4.9 wt %, Th v

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Sunilkumar, T. S., D. Narasimhan, and N. Krishna Rao. "Association of Authigenic Apatite with Uraniferous Organic Matter at Domiasiat, Meghalaya and its Genetic Implications." Journal Geological Society of India 48, no. 4 (1996): 409–14. http://dx.doi.org/10.17491/jgsi/1996/480405.

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Abstract The occurrence of authigenic apatite with uraninite, pyrite, sphalerite and galena within organic matter is a characteristic feature of the sandstone-type uranium deposit at Domiasiat, Meghalaya. Apatite occurs in the form of thin hexagonal basal plates and its identification is confirmed by x-ray diffraction. The authigenic apatite in this specific association points towards diagenesis in euxenic conditions of marine affinity.

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Windaryati, Lilis, Ngatijo Ngatijo, Pranjono Pranjono, and Torowati Torowati. "PENENTUAN KADAR URANIUM DALAM SERBUK UO2 DARI YELLOW CAKE SECARA POTENSIOMETRI DAN GRAVIMETRI." Jurnal Forum Nuklir 10, no. 2 (2017): 75. http://dx.doi.org/10.17146/jfn.2016.10.2.3555.

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PENENTUAN KADAR URANIUM DALAM SERBUK UO2 DARI YELLOW CAKE SECARA POTENSIOMETRI DAN GRAVIMETRI. Telah dilakukan penentuan kadar uranium dalam serbuk UO2 dari yellow cake yang berasal dari Pusat Teknologi Bahan Galian Nuklir (PTBGN). Serbuk UO2 yang ditentukan kadar uraniumnya merupakan hasil konversi yellow cake melalui jalur amonium diuranat (ADU) dan amonium uranil karbonat (AUK). Dalam penentuan kadar uranium diperlukan suatu metode yang valid sehingga diperoleh data yang akurat. Dalam kegiatan ini dibandingkan dua metode penentuan kadar uranium dalam serbuk UO2, yaitu secara potensiometri d

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Sterns, M., RL Withers, P. Midgeley, and R. Vincent. "Preparation and Partial Characterization of Two New Hexavalent Uranium Metal Uranates." Australian Journal of Chemistry 49, no. 7 (1996): 817. http://dx.doi.org/10.1071/ch9960817.

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The preparation, chemical characterization and structural investigation by X-ray and electron diffraction of two uranates (VI), namely Sr5U3O14 and of Pb11U5O26, are reported. The strontium compound, the unit cell of which is metrically tetragonal with a = 11.248(5), c = 11.086(5) Ǻ, Z = 4, was shown by electron diffraction to be orthorhombic, space group Pbca with a = b. Crystals of Sr5U3O14 are invariably submicroscopically twinned and, because of the identity of a and b, mimic tetragonal symmetry. The lead uranate , Pb11U5O26, was shown to be a long-period superstructure with unit cell dime

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Bhavya, Ravinder, Kaveri Sivaraj, and Lakshmanan Elango. "Assessing the Baseline Uranium in Groundwater around a Proposed Uraninite Mine and Identification of a Nearby New Reserve." Minerals 13, no. 2 (2023): 157. http://dx.doi.org/10.3390/min13020157.

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The presence of uranium in groundwater is a cause of concern all over the world. In mineralized regions where elevated concentrations of uranium are possible in groundwater, mining activities can further degrade the water quality. Hence, it is essential to document the baseline uranium concentration in groundwater before the commencement of mining. This study was carried out with the objective of assessing the concentration of uranium in groundwater around a proposed uraninite mining site in the Gogi region, Karnataka, India. Gogi is a village in the Yadgir district of Karnataka where groundwa

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Cuney, Michel. "Felsic magmatism and uranium deposits." Bulletin de la Société Géologique de France 185, no. 2 (2014): 75–92. http://dx.doi.org/10.2113/gssgfbull.185.2.75.

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Abstract The strongly incompatible behaviour of uranium in silicate magmas results in its concentration in the most felsic melts and a prevalence of granites and rhyolites as primary U sources for the formation of U deposits. Despite its incompatible behavior, U deposits resulting directly from magmatic processes are quite rare. In most deposits, U is mobilized by hydrothermal fluids or ground water well after the emplacement of the igneous rocks. Of the broad range of granite types, only a few have U contents and physico-chemical properties that permit the crystallization of accessory mineral

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Adi Rahmansyah, A. A., and Wahyu Srigutomo. "Natural Radioctivity Of Rock And Potential Availability Of Uranium-Thorium Minerals In Indonesia." Journal of Physics: Conference Series 2243, no. 1 (2022): 012058. http://dx.doi.org/10.1088/1742-6596/2243/1/012058.

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Abstract Radioactivity in rocks arises as a consequence of the presence of the radioactive elements uranium and thorium. These radioactive elements bond with other elements and form radioactive minerals that evolve on earth through a complex process that takes a very long time. In Indonesia, uranium and thorium mineralization are found in sandstone, metamorphic, volcanic types. volcanic, and intrusive. Generally, mineralization occurs due to hydrothermal processes caused by tectonic and volcanic activities. The potential for these radioactive minerals is spread from Aceh to Papua, with the hig

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Burron, Ian, Mostafa Fayek, Julie Brown, and David Quirt. "Remnants of a 1.55 Ga Hybrid Between Metasomatic Iron Alkali-Calcic and Unconformity-Related Uranium Environments in the Kiggavik Region, Nunavut, Canada." Economic Geology 119, no. 8 (2024): 1861–88. https://doi.org/10.5382/econgeo.5119.

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Abstract Uranium mineralization in the Kiggavik, Bong, End, and Andrew Lake deposits (Thelon region, Nunavut) was preceded by host-rock albitization, brecciation, silicification, and hematization. Uranium mineralization comprises three stages, the first stage having three substages: (1) front-style (U1a; 1594 ± 95 Ma), (2) euhedral disseminated (U1b; 1553 ± 16 Ma), and (3) polymetallic and monometallic vein-hosted (U1c; 1553 ± 16 Ma). Uraninite, coffinite, and local brannerite mineralization is associated with visually and chemically apparent dehematization and iron removal (bleaching), which

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