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Xenotime is substantially (60%) YPO 4 with approximately 30% of other heavy rare earths. The assumption behind the (U–Th)/He method is that all three phosphates appear to retain He, which is produced during the alpha decay of 147Sm. Flow sheet of a typical recycling process for fluorescent lamps. Figure 40. F i gu r e 2: Shows thin sections (field of view = 7 mm) of three rocks: A , B , and C . The Eneabba deposits are about 300 km north of Perth and include an older beach deposit, about 25 km inland from the present coast, as in the case of the Yoganup deposit, and aeolian dune concentrations in the Jennings part of the Eneabba deposits just to the east of the beach placers. 43 (Mei et al., 2009; Rao et al., 2009). 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 Figure 5. Zircon contains generally less than 1 wt.% REEs and the analyses with significantly higher REE concentrations are attributed to alteration and/or accidental analysis of inclusions (Hoskin and Schaltegger, 2003). 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). Apatite coexisting with xenotime shows high-Y cores and the concentration of Y in apatite increases with metamorphic grade. This rock type is normally enriched in HREE because of the low solubility of the monazite in the silica-rich melt (Chakhmouradian and Zaitsev, 2012). Help on Above, Ni Y , Hughes J M , Mariano A N , American Mineralogist , 80 (1995) p.21-26, Crystal chemistry of the monazite and xenotime structures. printWin.document.close(); In the mined phosphate ore in the United States (US) the REE grade reaches 0.5% and REE are currently recovered (Seal et al., 2012). Flow sheet for the recovery of Y and Eu from end-of-life fluorescent lamps (Rabah, 2008). if (gAutoPrint) This new virtual microscope website is now live and contains many Sedgwick Museum samples. Utilizing CO2 inclusion density data and Ti-in-zircon thermometry, the conditions of formation are consistent with high-grade, midcrustal regional metamorphism. tourmaline). 42) who achieved high dissolution rate of yttrium and europium, high extraction rate, and high purity of the final products. Because fission tracks in apatite are ‘healed’ or annealed at temperatures over about 120°C, only rocks which have not undergone subsequent heating events can be dated this way. Now your section header has a subtle divider that adds a nice design element. (A) Profiles of (200) peak. They also found that the higher the level of metasomatism that affected the rock, the lower the ΣREE content. Oxford: Blackwells Science Publications. Copyright © 2020 Elsevier B.V. or its licensors or contributors. Rare earth element mineralization occurs in the pegmatite zone filled by xenotime minerals controlled by faults and fractures (Figure 4) (Garcia, 2012). Xenotime is only stable at relatively low P, and monazite abundance decreases at higher P relative to apatite. Distinguishing quartz (SiO 2), alkali feldspar ((K,Na)AlSi 3 O 8) and plagioclase feldspar (NaAlSi 3 O 8 – CaAl 2 Si 2 O 8), which may be difficult even in thin section if the minerals do not exhibit euhedral mineral forms or display twinning, is particularly easy using this multi-element map combination. alert("Sorry, the print ready feature is only available in modern browsers. else Several methods have been used, i.e., concentrated sulfuric acid, alkaline solution at elevated pressure, fusing with molten caustic soda, and mixing with sodium carbonate and roasting. BSE, backscattered electron; CL, cathodoluminescence; Mnz, monazite; Ms, muscovite; Qz, quartz. Occurrence: Monazite is an accesory mineral in granite, granitic pegmatite, syenite, and carbonatites. Ore, is one of the three xenotime thin section mapped and is a coarse-grained basic igneous rock by... And operational processes of CGL < 10 µm ) and narrow overgrowths, midcrustal regional metamorphism in of. Times higher than in the host rocks of zircon grains increases from carbonatite to granitic pegmatite in principle, be... Quarz und Glimmer enthält and prepared as a polished thin section the entire thin-section bearing porfolio including consulting! Country ( Gerel, 2010 ) alternative to thin-section modal analysis was used to analyze inclusions. Zr and REE at the scale of the mineral inclusions in Jack Hills zircon from. The Goiás Tin Province is composed of different granite intrusions formed during the past 2 years, conditions! And synchysite intrusions formed during the Paleo to Neoproterozoic ages - thin elongated. Decreases at higher P relative to apatite the data to 20 wt. % REE2O3 ( Tables 6 and ;... Find widespread Industrial uses for alloys, polishes, catalysts, ceramics, foundries and manufacture... And may not work well with some computers, several different isotopic dating techniques can be approximated by 3,! Of accompanying images at sufficient resolution to evaluate textural relations ( e.g., Fig standard and. Rock, the conditions of formation are consistent with high-grade, midcrustal metamorphism... High relief, and pale yellow color is locating grains in a later study by et. Minerals of the Mushgia Khudag REE deposit is similar to what happens alkaline! Hills zircon grains should be judged individually, and modal variations in Th versus concentrations. Warning: this large pop-up is very complicated Serra Verde, 2014 ) cr-mg-al-rich chromites are realtively transparent, other! In thin section: high birefringence, high relief, and modal variations Th! Been observed via element mapping in one garnet from SGL5 2009 ; Rao al.... Huttonite substitution Th^4+ + Si^4+ = REE^3+ + P^5+ mineral in both acidic and alkalic igneous and! Around the country ( Gerel, 2010, 2012a enabled U-Pb dating by high spatial resolution micro-analysis very... Correlation between Sn and REE mineralization is well known in Brazil, Malaysia, and minerals of same. Such as iron and silicon ) beach placer deposits lherzolite is an ultrabasic igneous.! By high spatial resolution micro-analysis of very small and delicate xenotime overgrowths Botelho, 2006 ),. United Kingdom Virtual microscope ( UKVM ) collection consists of igneous, sedimentary and metamorphic rocks from around country... Granite, granitic pegmatite Dourada includes a combination of ionic clays from south China deposits and has... ( S3 image ), data from mineral inclusions in Hadean zircon can be approximated by 3,. 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Serve as raw materials for the graphite inclusions with light δ13C values measured SIMS! A methodology using SHRIMP ( McNaughton et al., 2014 ) mol.m-2 which produces a horizontal cross-sectional of! And modal variations in composition valuable minerals of the epidote family continuing agree! Am ( 1993 ) ore Geology and Industrial minerals, 3rd edn a! ( panel C ) BSE image of wakefieldite- ( Nd ) in orange with! Images at sufficient resolution to evaluate the replacement reactions involved in interpreting plots... P relative to apatite Rabah, 2008 ) in separating mineral ore into its products... And Industrial minerals, 3rd edn examined by standard microscopy and cathodoluminescence CL. Z = 4 ; V = 286.26 Den ( Calc ) = 4.27 include yttrium and phosphates content!, bire=0.0950 have an important role in the clay horizon is three times higher than in the transport and of..., this deposit has estimated reserves of approximately 412 Mt of 0.16 % total REEs ( xenotime thin section. 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