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The Maw zone rare earth element (xenotime) deposit is hosted in brecciated sandstones in the Athabasca Basin and is associated with silicification, hematitization, …
Xenotime (YPO 4) is a heavy rare earth element (HREE) phosphate, the principal host to economic HREE mineralization and a common accessory mineral in igneous, metamorphic and sedimentary rocks.Many occurrences of xenotime-(Y) are of hydrothermal origin, and therefore, determination of its solubility in aqueous fluids may …
This study investigates the paragenesis and ore mineral composition of xenotime [(Y,HREE)PO 4] and florencite [LREEAl 3 (PO 4) 2 (OH) 6] from heavy rare earth element (HREE) deposits/prospects of the Tanami and Hall Creek regions of Western Australia.Two stages of xenotime-(Y) formation are recognized: (1) early xenotime-(Y) …
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Xenotime formed during early to late diagenesis should show chemical characteristics related to its host rock and pore fluids, prior to compaction: i.e. before …
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First, it has recently been recognized that trace elements in metamorphic rocks, and especially trace element zoning in garnet and other major phases, contain considerable detailed information ...
The xenotime REE patterns are consistent with an origin from hydrothermal quartz veins in the Datas area that cut greenschist-facies metasediments and that locally …
A natural gem quality, inclusion-free, U-poor xenotime has been metasomatically altered at 900 °C and 500–1000 MPa in a series of alkali-bearing fluids including 2 N KOH, 2 N NaOH, Na 2 Si 2 O 5 + H 2 O, and NaF + H 2 O to which UO 2 and SiO 2 have been added. All experiments were buffered to CO 2-CO-graphite with the …
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Xenotime grows in sediments during diagenesis, in low- to granulite-grade metamorphic rocks, in migmatites, and is common in peraluminous igneous rocks. …
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Xenotime is a kind of rare earth elements, which can be produced in some rocks, such as granite, granite pegmatite, and alkaline granite. This accelerates the xenotime mining …
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Petrographic studies indicate that xenotime precipitated after significant compaction of the host rocks and was coeval with the main phase of tourmaline and drusy quartz. ... The similarities in wall-rock alteration, paragenesis, mineralization age, oxygen isotopes, and fluid inclusion attributes between the Maw zone rare earth element deposit ...
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were as presented in Table 1. It was shown that xenotime contained less than 1% of thorium and uranium, while monazite had a slighter higher percentage of thorium as compared to uranium. Table 1. Percentage of thorium and uranium analysed from xenotime and monazite Mineral Thorium (%) Uranium (%) Raw xenotime 0.62 0.57 …
1. Introduction. Xenotime (YPO 4) is a trace mineral in many rock types (Rasmussen, 2005).Its significance far outweighs its low abundance and small grain size for two main reasons: 1) it forms in many common rock types from a range of high- to low-temperature processes, and 2) it is an excellent mineral for U/Pb geochronology, …
Xenotime describes a group of several closely related phosphates, arsenates, and vanadates composed of rare earth elements.The term is generally used to describe the most common member of the group, Xenotime-(Y), which is the yttrium phosphate end member of this series.. Other, rarer members of the Xenotime series include Xenotime …
Xenotime, a phosphate ore, is one of the valuable mineral deposits of rare earths similar to monazite.The main characteristics of xenotime are listed below: (1) The content of yttrium is high while that of the light rare earths is low (Table 12). (2) The content of thorium is lower than that in monazite (Table 13). (3) The composition of tungsten-containing xenotime …
Monazite and xenotime are the two most useful and commonly used geochronometers for deciphering ages from metamorphic rocks. The low analytical cost involved in electron probe micro-analyser chemical dating, ease of sample preparation and abundance in metamorphic rocks of wide P–T conditions make monazite and xenotime …
2.2.1 Occurrence. Rare earth minerals occur as fluorites, oxides, tantalates, carbonates, phosphates, sulfates, borates, silicates, etc. (Qi 2018).List of different rare earth minerals are presented in Table 2.3.The average concentration of REEs in the earth's crust is found to be 150–220 ppm, which is much higher than the concentration of other …
Monazite, Xenotime, Apatite, and Rhabdophane are each explored through lists of conducted research to develop a synopsis of their characteristics and notable …
Xenotime (YPO 4) is iso-structural with zircon-group minerals and lies at one end of a compositional solid-solution with monazite.As with monazite and zircon, naturally occurring xenotime may accommodate significant concentrations of rare earth elements, as well as Th and U, making it an important repository for these valuable …
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Xenotime (from the Greek words xenos, "foreign", and time, "honour") is a Rare Earth phosphate mineral, whose major component is yttrium orthophosphate (YPO 4).It forms a solid solution series with chernovite-(Y) (YAsO 4) and therefore may contain trace impurities of arsenic, as well as silicon dioxide and calcium.The Rare Earths dysprosium, erbium, …
Xenótimo (Xenotime). Xenótimo, xenotímio ou xenotímia (do grego xenos, "estranho", e time, "honra") é um mineral raro composto de fosfato de í, com fórmula química YPO4. Forma uma solução sólida com a chernovite-(Y) (YAsO4) e portanto pode conter impurezas vestigiais em que se incluem arsénio, dióxido de silício e cálcio; as terras raras …
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