Sm. In xenotime-bearing peraluminous granites, the frac-* E-mail: [email protected] tions of Y and total HREE contained in xenotime vary from;30–50% (Bea 1996a). Xenotime rarely has been studied intensively in con-trast to apatite, zircon, and monazite, on which a consid-erable amount of experimental and analytical work has

This paper reviews rare earth minerals (monazite and xenotime) separation by flotation. A wide range of monazite and xenotime flotation test results are summarized including: reasons of variation in the point of zero charges on these minerals, the effects of various flotation conditions on zeta potential of monazite and xenotime, interactions of …

The A-site of the chernovite-(Y)–xenotime-(Y) series is characterised by a relatively constant composition, where Y is always the dominant cation (ranging from a maximum of 0.78 apfu to a minimum of 0.46 apfu), followed, on …

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 …

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 ...

The rock composition (sample VNP130) was selected from Wall et al. (2008), and is for a rock in which an albite-bearing mineral assemblage was replaced by carbonates ± quartz ± apatite ± Fe oxides. Altered zircon crystals and hydrothermal xenotime-(Y) are present in the sample.

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 responsible for their petrogenesis. Naturally occurring xenotime may also accommodate significant amounts of U and Th allowing geochronological constraints to be placed on …

Xenotime is a mineral that primarily contains YPO4, up to 60% in composition, with another 30% of the composition containing other heavy rare Earths [4][16]. Xenotime is a rare Earth

Xenotime is a tetragonal mineral (space group I 4 1 / amd) with a zircon-type structure. It is characterised by an ideal formula of AT O 4 where A represents …

This study investigates the paragenesis and ore mineral composition of xenotime [(Y,HREE)PO4] and florencite [LREEAl3(PO4)2(OH)6] from heavy rare earth …

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 …

Cell Data: Space Group: I41/amd. = 6.884–6.902. = 6.021–6.038. = 4. X-ray Powder Pattern: Synthetic. 3.443 (100), 2.558 (60), 1.762 (45), 4.54 (25), 2.145 (25), 1.820 (18), …

PDF | Xenotime (YPO4) is iso-structural with zircon-group minerals and lies at one end of a compositional solid-solution with monazite. As with monazite... | Find, read and cite all the...

Forms a series with xenotime-(Y). IMA Status: Approved IMA 1999 (Dana # Added) Locality: Shatford Lake pegmatite group, near the margin of the Lac du Bonnet batholith, southeastern Manitoba. Link to MinDat Location Data. Name Origin: Named after its composition and relationship with xenotime-(Y). Name Pronunciation: Xenotime-(Yb) …

Xenotime-(Y) and monazite are common accessory phosphates that control the rare earth element (REE) budget in many rocks. Whereas monazite preferentially incorporates the light REE (LREE) from La to Gd, the xenotime incorporates the heavy REE (HREE) from Tb to Lu (Ni et al. 1995).For monazite, the REE patterns are steep …

Xenotime, widely distributed phosphate mineral, yttrium phosphate (YPO4), though large proportions of erbium commonly replace yttrium), …

Composition of Xenotime Concentrate, % [128] d. Comparing with monazite concentrate, the decomposition of xenotime concentrate is more difficult. The methods adopted for …

These crystals belong to a 300 g xenotime assortment, collected from alluvial deposits in SE Brazil. Electron microprobe and Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS) analyses show that the selected crystals are internally homogeneous for most rare earth element, (REE, except some light REE) but …

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,

The composition of xenotime in relation to the bulk-rock concentrations of the lantha- nides and actinides (e.g., Table 1), and the relative pro- portions among them, are explored in this section. ...

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 is …

Xenotime (YPO4) is iso-structural with zircon-group minerals and lies at one end of a compositional solid-solution with monazite.

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 …

Composition: Xenotime Group: Phosphate, vanadate, or arsenate of yttrium, ytterbium, cerium, lanthanum, neodymium, or scandium

Xenotime composition. Representative EMPA of xenotime are presented in Table 4. Microprobe analyses often reveal, analogous to zircon, low totals suggesting hydration of xenotime. The water content estimated from analytical data ranges from 1 to 11 wt. % H 2 O. The F content in xenotime is similar to that measured in zircon and …

The bulk composition and the mineral phases in which the elements are present were studied by wavelength-dispersive X-ray fluorescence (WD-XRF) and X-ray diffraction (XRD) studies respectively. ... only three minerals, namely bastnaesite, monazite, and xenotime, have been recognized as economical sources containing extractable …

However, high‑uranium xenotime (e.g., 5.5 wt%), is uncommon as approximately half of the xenotime in the world has uranium concentrations of less than 1.1 wt%. Therefore, on-site and field analysis using XEOL imaging could be applied as a first-pass technique to quickly identify xenotime at REE deposits or during exploration …

Composition: Molecular Weight = 183.88 gm. Yttrium 48.35 % Y 61.40 % Y 2 O 3. Phosphorus 16.84 % P 38.60 % P 2 O 5. Oxygen 34.80 % O. ______ ______ 100.00 % …

In this respect, xenotime is no different from other metamorphic minerals in that the rock composition and metamorphic conditions largely control the mineral compositions. From the limited data in Fig. 6, the rock composition appears to have the dominant control. Download : Download high-res image (203KB) Download : Download …

The high U content of xenotime-(Y) and composition of early florencite-(Ce) potentially support a genetic association between the HREE mineralization and the coeval unconformity-related U deposits ...

The composition of these minerals indicates that the alteration species of the intermediate thorite–xenotime–zircon solid solution largely inherited the complex chemistry of their parents. Thorite-bearing granites from Jordan display a widespread decomposition of allanite and monazite into REE fluorocarbonates.

After composition measurements, the sample mounts were gently polished to remove the carbon coating, and then Au-coated with reference materials that in a separate mount. The instrument configuration and operating procedures followed the established protocols for apatites and monazites ( Sano et al., 1999, Sano et al., 2006 ).

Xenotime-(Y) YPO4 c 2001-2005 Mineral Data Publishing, version 1 Crystal Data: Tetragonal. Point Group: 4/m2/m2/m. ... C.M. Gramaccioli (1991) The chemical composition of xenotime from fissures and pegmatites in the Alps. Can. Mineral., 29, 69–75. (4) Y. Ni, J.M. Hughes, and A.N. Mariano (1995) Crystal

The chemical composition of xenotime form fissures and pegmatites in the Alps Francesco Demartin; Francesco Demartin ... Xenotime-(Yb), YbPO 4, a new mineral species from the Shatford Lake pegmatite group, southeastern Manitoba, Canada The Canadian Mineralogist. A comparative study of some pegmatitic and fissure …

The altered xenotime is patchy zoned at the microscale and shows a greater extent of microporosity closer to the neighbouring zircon, but bears a homogeneous crystallinity and composition regarding nanoscale observations of foils in domains of lower porosity further away from the zircon.

This study explores the origin and geochemical evolution of apatite, monazite, and xenotime along two metamorphic traverses. The first, Fluorapatite, [Ca 5 (PO 4)F], is a common accessory mineral from the Kigluaik Mountains, Seward Peninsula, Alaska, consists in most amphibolite and granulite facies, metapelitic to of a localized (85 cm) …

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 ...