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December 29, 2015

xenotime thin section

Mongol Gazar Ltd., which is one of the companies involved in developing the REE prospect, was a collaborator in this project. As well, different methods of determining isotopic compositions are available and need to be selected, depending on which mineral is involved, the precision required, and other factors. if (document.getElementById != null) { Xenotime is present as rare inclusions in the high-Y rim , indicating that xenotime also formed during back-reaction. 13 images. Zircon was not detected with any of the analyzed xenotime grains. Currently, about 95% of the world’s rare earth (RE) resources and REO production occur in bastnaesite, monazite, and xenotime (Miyawaki and Nakai, 1996; Gupta and Krishnamurth, 2005). General Xenotime-(Y) Information : Chemical Formula: YPO4 : 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 % 100.00 % = TOTAL OXIDE Fission track dating uses damage tracks in apatite arising from the spontaneous fission of 238U, which occurs at a known rate. Scale: Not Given. Leaching experiments using zircon samples with different crystallinity indicate that extraction of HREEs from low crystallinity zircon using dilute hydrochloric acid is much easier compared to the highly crystalline zircon (Hoshino et al., 2012a). Ilmenite may be dominant, as in Travencore, India, and Capel/Yoganup, Western Australia, but elsewhere rutile is dominant, as in the deposits of Queensland and Eneabba, Western Australia. High-REE minerals in this granite type include, Lenharo et al., 2003; Dardenne and Schobbenhaus, 2001, Marini et al., 1992; Pollard, 1995; Teixeira and Botelho, 2006, ], occurring in the albite granite core and edge subfacies, respectively; (3) REE-bearing minerals such as, Teixeira and Botelho, 2006; Santana, 2013. G.J.H. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. URL: https://www.sciencedirect.com/science/article/pii/B9780444634832000041, URL: https://www.sciencedirect.com/science/article/pii/B9780124095489105093, URL: https://www.sciencedirect.com/science/article/pii/S0168127316300010, URL: https://www.sciencedirect.com/science/article/pii/B0123693969002719, URL: https://www.sciencedirect.com/science/article/pii/B0080437516031765, URL: https://www.sciencedirect.com/science/article/pii/S156948600901701X, URL: https://www.sciencedirect.com/science/article/pii/B9780128023280000255, URL: https://www.sciencedirect.com/science/article/pii/B9780444639011000125, URL: https://www.sciencedirect.com/science/article/pii/B9780128023280000048, Handbook on the Physics and Chemistry of Rare Earths. Keyboard Note also that no cracks are visible in the image of S1; however, hidden cracks are visible in images of S2 and S3. You can then repeat this process for all of the section headers on your page. Xenotime crystal . In the ore minerals from the Madeira granite that encompassed the richest granite intrusion (facies), the main ore minerals are cassiterite (associated with zircon), columbite-tantalite, pyrochlore, and xenotime, whereas the Água Boa granite mainly includes cassiterite, columbite-tantalite, and topaz (Koury and Antonietto, 1988). Add tags Comment Rate. This indicates a miscibility gap between the two which, in principle, should be temperature and pressure dependent. Xenotime-(Y) occurs together with other phosphates, mainly augelite, lazulite, and minerals of the svanbergite-crandallite-goyacite-florencite group. BSE, backscattered electron; CL, cathodoluminescence; Mnz, monazite; Ms, muscovite; Qz, quartz. The apatite vein type of REE material was used in this study because beneficiation test results reported for this ore type are relatively scarce in the previous literature. "); Illustration of flow sheet of RE recovery from NdFeB scraps using molten chlorides. 12.10D). RBC Thin Section Bearings ITM UNITEC GmbH as authorized RCB distributor represents the entire thin-section bearing porfolio including technical consulting. Each thin section was first scanned in unpolarized light and then again between two sheets of crossed polaroid film aligned parallel to the thin section edges. The company will exploit primary REE-bearing minerals such as xenotime, monazite, fergusonite, and minor allanite and pyrochlore and secondary minerals including bastnaesite and REE-adsorption clays. Note the textural similarity of muscovite in the vein with muscovite in the isolated inclusion (panel C). M. Hoshino, ... Y. Watanabe, in Handbook on the Physics and Chemistry of Rare Earths, 2016. Authigenic xenotime Description One hundred and thirty polished thin sections, selected from various depths in the drill‐hole, were examined for xenotime using the SEM. S - Stereo Pair on/off 5F ). Zircon (/ ˈ z ɜːr k ɒ n / or / ˈ z ɜːr k ən /) is a mineral belonging to the group of nesosilicates, and it is a source of the metal zirconium.Its chemical name is zirconium silicate, and its corresponding chemical formula is Zr SiO 4.A common empirical formula showing some of the range of substitution in zircon is (Zr 1–y, REE y)(SiO 4) 1–x (OH) 4x–y. In addition to the sedimentary deposits, phosphates are an important constituent in many REE ores associated with igneous and igneous-hydrothermal systems such as those in Mountain Pass, US, and Bayan Obo, China (Castor, 2008; Wu, 2008). brownish yellow, grayish brown, or greenish. 1 An In-Situ Electron Microscopy Study of Dual Ion-Beam Irradiated Xenotime-type ErPO 4 Mohamed Ruwaid Rafiuddin,1,* Anne-Magali Seydoux-Guillaume,2,3,* Xavier Deschanels,1 Adel Mesbah,1 Cedric 4Baumier, Stephanie Szenknect,1 and Nicolas Dacheux1 1ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France 2Univ Lyon, Univ Lyon 1, ENSL, CNRS, LGL -TPE, F 69622, Villeurbanne, France Garnet is a common target of yttrium zoning studies because it readily accommodates yttrium as “YAG” (Y3Al5O12), where substitution of Y3+ for divalent cations in the cubic site is charge balanced by substitution of Al3+ for Si4+ in the tetrahedral site. The high amounts of HREEs are preferentially incorporated by xenotime substitution HREE3 + + P5 + ↔ Zr4 + + Si4 +, but a continuous solid solution between the endmembers (zircon and xenotime) is unlikely to exist (eg, Förster, 2006). Major and trace element analyses of xenotime and monazite were carried out using a Cameca SX-100 EPMA equipped with four wavelength dispersive spectrometers (WDS), at the Department of Geology and … Ask about Xenotime-(Y) here : drag1 - LMB Manipulate Structure (Dana8). To link to this object, paste this link in email, IM or document To embed this object, paste this HTML in website. Menneken et al. Xenotime is isostructural with zircon (tetragonal, 4/m2/m2/m, space group I4a/amd), requiring collection of simultaneous energy dispersive spectroscopy elemental maps during EBSD analysis to fully distinguish the two phases. Home Rocks and Minerals Biotite (thin section) Reference URL Share . Black sand deposits commonly contain ilmenite, monazite, rutile, xenotime, and zircon, all valuable minerals. Occurrence: Monazite is an accesory mineral in granite, granitic pegmatite, syenite, and carbonatites. Cameron et al. In thin section: high birefringence, high relief, and pale yellow color. Granitic complexes usually exhibit vertical and sometimes lateral zoning, with well-developed mineralogical, textural, and modal variations in composition. In situ monazite and xenotime geochronology by electron microprobe analysis (EPMA) at the University of Colorado, Boulder January 16th, 2017 Lab description The CU Boulder Electron Microprobe Laboratory hosts a JEOL JXA-8230 electron probe microanalyzer (EPMA), a carbon and metal evaporator for coating, and a thin section preparation shop. McCall, in Encyclopedia of Geology, 2005. Warning: this large pop-up is very compute intensive and 46) (Zhong et al., 2014). SiO2 content in the host rocks of zircon grains increases from carbonatite to granitic pegmatite. A lherzolite is an ultrabasic igneous rock dominated by essential Olivine and clinopyroxene and orthopyroxene in equal proportions. Table 12. Zircon in carbonatite has chemical composition close to the endmember (ZrSiO4), while zircon in granitic pegmatite, strongly fractionated rock, may contain over 15% REE2O3 (especially HREEs). In general, these deposits over granitic rocks have a low mining cost (Wu et al., 1996; Kynicky et al., 2012). Phosphate deposits are important REE resources. (3) The composition of tungsten-containing xenotime is very complicated. (A) Images of three polished surfaces of the same grain (S1, S2, and S3). 4.7.84G. Simplified geological map of the Mushgia Khudag REE deposit, South Gobi, Mongolia. Zhifeng Zhang, ... Wuping Liao, in Handbook on the Physics and Chemistry of Rare Earths, 2015. developed a “dry-wet” combining method of two hydrometallurgy steps as shown in Fig. Xenotime buffers yttrium in garnet, but garnet growth also consumes xenotime. However, there are many complicating factors involved in interpreting these plots and in measurement of the data. Massive - Granular - Common texture observed in granite and other igneous rock. Measuring the number of tracks that have accumulated since a crystal formed, along with estimating the amount of uranium it contains, means that a geological age can be calculated. } The aim of the site is to allow users to examine and explore minerals and microscopic features of rocks, helping them to develop classification and identification skills witout the need for high-cost microscopes and thin section preparation facilities. Weathering has a strong influence on the enrichment of REE deposits related to granitic rocks, similar to what happens to alkaline carbonatite deposits. 3); xenotime-(Y) also is present. Brecciated xenotime . html += printReadyElem.innerHTML; Add tags Comment Rate. Ask-A-Mineralogist from the Mineralogical Society of America A Y-rich annulus has been observed via element mapping in one garnet from SGL5. usually <50 µm across) xenotime overgrowths on detrital zircon in numerous thin sections of clastic rocks. 113 Identification of zircon, monazite, and xenotime was performed by acquiring full-thin-section 114 Wavelength Dispersive Spectroscopy (WDS) maps of Zr L, Ce Lα and Y Lα on a α 115 CAMECA SX-50 microprobe at the University of Massachusetts, following the …

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