Compositional Variability of Monazite–Cheralite–Huttonite …
A comprehensive study of monazite–cheralite–huttonite solid solutions (s.s.) and xenotime from the highly evolved, strongly peraluminous P–F–Li-rich Podlesí granite stock in the Krušné ...
Hydrothermal monazite and xenotime chemistry as genetic …
Notable differences in overall xenotime abundances and concentrations of heavy REEs, Ca, and Sc are distinctive between the different deposit classes for xenotime. ... This suggests that the composition of local host rock has a negligible effect on the chemistry of hydrothermal phosphates except in some instances for xenotime from orogenic gold ...
(PDF) Microprobe Monazite Geochronology: Understanding Geologic
Monazite and xenotime U-Th-Pb total dates and compositions were acquired with the Cameca SX-Ultrachron electron microprobe at the University of Massachusetts-Amherst (Hetherington et al., 2008;M ...
(PDF) Experimental metasomatism of monazite and xenotime…
The xenotime and Brazil monazite were lightly crushed into ∼100–500 µm sized fragments in ethanol. The fragments were washed and placed in an ultrasonic bath to aid disaggregation. After Experimental metasomatism of monazite and xenotime Table 1 Average composition of monazite and xenotime used in experiments n.a.
Understanding geologic processes with xenotime: Composition…
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xenotime composition
Xenotime in the Browns Range has a very uniform chemical composition and is accompanied by hematite and minor light REE (LREE)-bearing florencite–goyazite (Cook et al., 2013). The breccias containing this ore ( Fig. 2A ) are associated with silicification and smectite–illite replacement of K-feldspar in the surrounding arkoses ( Morin-Ka et ...
SHRIMP U–Pb and REE data pertaining to the origins of xenotime …
The Belt–Purcell Supergroup, northern Idaho, western Montana, and southern British Columbia, is a thick succession of Mesoproterozoic sedimentary rocks with an age range of about 1470–1400 Ma. Stratigraphic layers within several sedimentary units were sampled to apply the new technique of U–Pb dating of xenotime that sometimes forms as rims on detrital …
Xenotime-type high-entropy …
Influence of phase composition on thermal aging behavior of plasma sprayed ytterbium silicate coatings. Ceram Int 2018, 44: 17359–17368 ... Duan X, Xie X, et al. Xenotime-type high-entropy (Dy 1/7 Ho 1/7 Er 1/7 Tm 1/7 Yb 1/7 Lu 1/7 Y 1/7)PO 4: A promising thermal/environmental barrier coating material for SiC f /SiC ceramic matrix composites ...
Compositional Variability of …
xenotime compositions in different types of ore-bearing and barren granites of the Erzge-birge/Krušné Hory; and (iii) an attempt to establish basic relations between monazite and xenotime compositions and the bulk-rock composition of the parental granite. 2. Geology 2.1. Variscan Granites of the Erzgebirge/Krušné Hory Area
(PDF) Microprobe Monazite Geochronology: …
To maximise the petrographic potential of xenotime, a complete understanding of its composition and relationship to rock-forming assemblages is essential.
Understanding geologic processes with xenotime: …
Xenotime grows in many rock types, and can be linked via composition and textures to major rock-forming silicates and subsequently to the geologic processes …
Xenotime Meaning, Benefits, Properties & Usage in Jewelry …
Discover the intriguing world of xenotime, a rare mineral valued for its yttrium phosphate composition and unique properties. This article dives into its physical attributes, metaphysical significance, and diverse applications in jewelry and industry. Learn how xenotime's vibrant colors adorn exquisite jewelry pieces and fuel advancements in electronics and clean …
Recovery of Xenotime and Florencite from Silicate Minerals …
Xenotime (YPO4), a significant phosphatic minerl rich in heavy rare earth elements (HREEs), typically associates with granitic rocks, exemplified in the Wolverine rare earth …
Mineral chemistry of Rare Earth Element (REE
Xenotime is very selective towards HREE and Y. EPMA and LA–ICP–MS analysis revealed that HREE (notably Dy, Er, Gd and Yb) and Y occur predominantly within xenotime and that the xenotime composition is consistent across all prospects and xenotime generations with the exception of some grain margins, which are particularly rich in
Experimental metasomatism of monazite and xenotime: …
If monazite and xenotime can be altered by specific fluid compositions during metamorphism, evidence for the alteration as well as the nature of the alteration could provide information on the composition and physical nature of the fluids involved. Since monazite and xenotime are important geological repositories for P, Th, U, REE and Y,
Alteration and breakdown of xenotime- (Y) and monazite
Composition of xenotimePrimary xenotime-(Y) displays only minor compositional variations for different samples. The mole fraction of YPO 4 ranges from 0.75 to 0.84, with an average value of 0.78. The heavy REE, but principally Gd, Dy, Er and Yb, comprise mole fractions totalling 0.1–0.2. The light REE (La to Sm) are not readily incorporated ...
(PDF) Composition and origin of intermediate solid …
Composition of xenotime expressed as percentages of (Y + REE + Th + U + Zr + Hf) atoms. Symbols as in Fig. 2. Other occurrences: Bea (1996). Numbers in parentheses are the weight percentages of ...
Monazite-(Ce) Mineral Data
Composition: Molecular Weight = 240.21 gm Lanthanum 14.46 % La 16.95 % La 2 O 3 Cerium 29. 17 % Ce 34. ... (1995) p.21-26, Crystal chemistry of the monazite and xenotime structures . View Additional jPOWD Structure files for Monazite-(Ce) Physical Properties of Monazite-(Ce) Cleavage: {001} Distinct, {100} Indistinct : Color: Brown, Colorless ...
Understanding geologic processes with xenotime: composition…
Understanding geologic processes with xenotime: composition, chronology, and a protocol for electron-probe micro-analysis. / Hetherington, Callum; Williams, Michael L; Jercinovic, Michael J et al. In: Chemical Geology, 2008, p. 133-147. Research output: Contribution to …
(PDF) Composition of monazite and xenotime from the …
In spite of the importance of xenotime, only a few electron-microprobe studies exist on its composition. Xenotime has been analyzed from Au-bearing veins (Kerrich and King 1993), placer deposits ...
Xenotime: Mineral information, data and localities.
Visit gemdat for gemological information about Xenotime. Paleoarchean to Carboniferous : 3266 ± 3 Ma to 316 ± 3 Ma - based on 24 recorded ages. Data courtesy of the American …
Geochemical characterisation of xenotime formation …
Xenotime (YPO4) is a trace component in many metasedimentary and some igneous rocks, altered rocks and many hydrothermal ore assemblages, where it forms in …
Rare-earth-element minerals in martian breccia
Locally, the composition of F-rich regions can reach pure fluorapatite. The chlorapatite hosts are similar in composition to isolated apatite without monazite inclusions, and to euhedral apatite in lithic clasts. ... lunar basalt 10047 (Muhling et al., 2014) being the other. Xenotime in NWA 7034 is the first reported occurrence in an ...
Composition and origin of intermediate solid solutions in …
Thorite–xenotime solid solutions of intermediate composition may form individual grains of larger size, rarely approaching 150 μm. Compositional variation at the scale of a single grain is not systematic, but irregular and associated with patchy zonation.
Occurrence, Geology, Mineralogy, and Processing of Monazite, Xenotime …
xenotime, many impurities may be found within its composition alongside possessing higher content in REEs, most notably with tungsten and niobium causing processing complications [4].
Metasomatic thorite and uraninite inclusions in xenotime …
The composition of unaltered xenotime lies on the linear trend line of best fit between thorite and altered xenotime (Fig. 5e) indicating a high degree of compositional retention between reactants and products during the alteration process.
Improved calibration procedures and new standards for …
Growing a xenotime crystal of sufficient homogeneity is probably just as difficult as finding a natural one, but it might be possible to create a glass that approximates xenotime composition. This could not be used as a direct standard because the efficiencies of secondary ion production from the glass would not match those from xenotime.
Xenotime: The mineral xenotime information and pictures
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 …
Xenotime-(Y) Mineral Data
Minor accessory mineral in both acidic and alkalic igneous rocks and their pegmatites. Hidra (Hitterø), Flekkefjord, Vest-Agder, Norway Link to MinDat Location Data. From the …
Monazite and xenotime petrochronologic constraints on …
Monazite and xenotime overgrowths and whole grains near garnet yielded 1424 ± 12 Ma and 1395 ± 15 Ma dates, respectively, and a temperature estimate of ~440 °C. The composition of these grains and their occurrence near resorbed garnet are consistent with growth during garnet breakdown (Williams et al., 2007, 2017; Hillenbrand et al., 2023b).