 | Cordeiro, Pedro Filipe de Oliveira, Brod, José Affonso, Palmieri, Matheus, de Oliveira, Claudinei Gouveia, Barbosa, Elisa Soares Rocha, Santos, Roberto Ventura, Gaspar, José Carlos, Assis, Luis Carlos (2011) The Catalão I niobium deposit, central Brazil: Resources, geology and pyrochlore chemistry. Ore Geology Reviews, 41 (1) 112-121 doi:10.1016/j.oregeorev.2011.06.013 | Journal (article/letter/editorial) | | deposit, central Brazil: Resources, geology and pyrochlore chemistry Pedro Filipe de Oliveira Cordeiro a...July 2011 Keywords: Catalão I Carbonatite Phoscorite Nelsonite Pyrochlore a b s t r a c t The Catalão...Catalão I alkaline–carbonatite–phoscorite complex contains both fresh rock and residual (weatheringrelated)...Mine II and East Area, respectively emplaced in carbonatite and phlogopitite. Together, these orebodies contain...detail, the orebodies consist of dike swarms of pyrochlore-bearing, olivine-free phoscorite-series rocks |  | Torró, L., Villanova, C., Castillo, M., Campeny, M., Gonçalves, A. O., Melgarejo, J. C. (2012) Niobium and rare earth minerals from the Virulundo carbonatite, Namibe, Angola. Mineralogical Magazine, 76 (2) 393-409 doi:10.1180/minmag.2012.076.2.08 | Journal (article/letter/editorial) | | Niobium and rare earth minerals from the Virulundo carbonatite, Namibe, Angola L. TORRÓ1, C. VILLANOVA1, M...Virulundo carbonatite in Angola is one of the largest in the world and contains pyrochlore as an accessory...mineral in all of the carbonatite units (calciocarbonatites, ferrocarbonatites, carbonatite breccias and trachytoids)...trachytoids). The primary magmatic pyrochlore is fluorine dominant and typically contains about equal molar...replacement of the primary pyrochlore by a second generation of pyrochlore with less F and Na. Low-temperature |  | | Journal (article/letter/editorial) | | xxxx Keywords: Carbonatites Niobium ore deposits Pyrochlore Laterite Supergene ores a b s t r a c t This...production of Nb, with the primary St. Honoré carbonatite and other sources accounting for only for 7 and...deposit is unique with respect to the varieties of pyrochlore present; extent of replacement by other minerals;...petrographically-defined units of carbonatite contain distinct suites of pyrochlore. Bulk rock analysis for Nb...and physical concentration of resistant primary pyrochlore. Intense lateritization results initially in |  | Melgarejo, Joan C., Costanzo, Alessandra, Bambi, Aurora C.J.M., Gonçalves, Antonio O., Neto, Andrés B. (2012) Subsolidus processes as a key factor on the distribution of Nb species in plutonic carbonatites: The Tchivira case, Angola. Lithos, 152. 187-201 doi:10.1016/j.lithos.2012.06.024 | Journal (article/letter/editorial) | | Available online 28 June 2012 Keywords: Carbonatite Pyrochlore Niobium Magmatic Hydrothermal Supergenic...Tchivira carbonatites contain several pyrochlore generations. Rare pyrochlore crystals, close to the fluorcalciopyrochlore...distribution. From the host rock to the centre of the carbonatite intrusion, the succession of alteration types...carbonates and fluorite are also common. Distinct pyrochlore compositions are characteristic for each altered...Pb-pyrochlores and Nb-rich rutile replace earlier pyrochlore generations and are present as inclusions in |  | Rampilova, Maria, Doroshkevich, Anna, Viladkar, Shrinivas, Zubakova, Elizaveta (2021) Mineralogy of Dolomite Carbonatites of Sevathur Complex, Tamil Nadu, India. Minerals, 11 (4) 355 doi:10.3390/min11040355 | Journal (article/letter/editorial) | | Research, Bhopal 462066, India; sviladkar@gmail.com Carbonatite Research Centre, Amba Dongar, Kadipani 390117...of the Sevathur carbonatite complex (Tamil Nadu, India) consists of dolomite carbonatite with a small number...number of ankerite carbonatite dikes. Calcite carbonatite occurs in a very minor amount as thin veins...veins within the dolomite carbonatite. The age (207 Pb/204 Pb) of the Sevathur carbonatites is 801 ± 11 Ma...trending fault systems. Minor minerals in dolomite carbonatite are fluorapatite, phlogopite (with a kinoshitalite |  | | Journal (article/letter/editorial) | | MINERAL PARAGENESES Compositional Evolution of Pyrochlore-Group Minerals in Carbonatites of the Belaya Zima...khromova00@mail.ru Received January 13, 2016 Abstract⎯Pyrochlore-group minerals are the main concentrators of niobium...REE, and Y contents gradually increased. All carbonatite types are suggested to contain initial fluorcalciopyrochlore...this hydrated pyrochlore was replaced by Fe-bearing columbite. Keywords: pyrochlore group, fluorcalciopyrochlore...from melt inclusions in minerals from calcite carbonatite and ijolite (Panina and Podgornykh, 1975, 1979; |  | | Journal (article/letter/editorial) | | niobium, metallogeny of tantalum, tantaloniobates, carbonatite, nepheline syenite, alkali granite, syenite,...Siilinjärvi carbonatite and Saharjok nepheline–syenite (Zozulya et al., 2007). In the former, pyrochlore is only...(13) Bayan Obo; (14) Nemegosenda; (15) Luesh; (16) Bingo; (17) Ghurayyah; (18) Halzan Buregtei; (19) Ulug-Tanzek;...Motzfeldt Seis Lagos Bayan Obo Nemegosenda Luesh Bingo Ghurayyah Halzan Buregtei Ulug-Tanzek Zashihinskoe...means alkali granite; as, alkali syenite; cb, carbonatite; h, hydrothermal ore; ns, nepheline syenite; |  | Geisler, T., Berndt, J., Meyer, H.-W., Pollok, K., Putnis, A. (2004) Low-temperature aqueous alteration of crystalline pyrochlore: correspondence between nature and experiment. Mineralogical Magazine, 68 (6) 905-922 doi:10.1180/0026461046860230 | Journal (article/letter/editorial) | | Low-temperature aqueous alteration of crystalline pyrochlore: correspondence between nature and experiment...Corrensstr. 30, 48149 Münster, Germany ABSTR ACT Pyrochlore has been considered as a waste form to immobilize...plutonium. In order to study the aqueous stability of pyrochlore, we have carried out hydrothermal experiments...replacement of the microlite (up to ~10 mm) by a new pyrochlore phase. This new phase is characterized by a larger...the long-term stability of a pyrochlore waste form. K EY WORDS : pyrochlore, microlite, aqueous alteration |  | | Journal (article/letter/editorial) | | 377–392 Tracing the chemical evolution of primary pyrochlore from plutonic to volcanic carbonatites: the role...carbonatites are volcanic in origin. In Tchivira pyrochlore, zoning is poorly developed; fluorine is dominant...Angola, carbonatite, zonation in pyrochlore, fluorine, high field strength elements, HFSE, pyrochlore, rare...mineralization is associated with the early stages of carbonatite activity and carbonatites are commonly rich in...which is commonly present in minerals of the pyrochlore group * E-mail: alessandra.costanzo@nuigalway.ie |  | Walter, B.F., Parsapoor, A., Braunger, S., Marks, M.A.W., Wenzel, T., Martin, M., Markl, G. (2018) Pyrochlore as a monitor for magmatic and hydrothermal processes in carbonatites from the Kaiserstuhl volcanic complex (SW Germany) Chemical Geology, 498. 1-16 doi:10.1016/j.chemgeo.2018.08.008 | Journal (article/letter/editorial) | | Accepted Manuscript Pyrochlore as a monitor for magmatic and hydrothermal processes in carbonatites from...A.W. Marks, T. Wenzel, M. Martin, G. Markl , Pyrochlore as a monitor for magmatic and hydrothermal processes...the journal pertain. ACCEPTED MANUSCRIPT 1 Pyrochlore as a monitor for magmatic and hydrothermal processes...walter@uni-tuebingen.de ACCEPTED MANUSCRIPT 2 1. Abstract Pyrochlore from the Kaiserstuhl volcanic complex (SW Germany)...differences between various coarse-grained calcite-carbonatite bodies (Badberg, Degenmatt, Haselschacher Buck |  | LEE, MI JUNG, LEE, JONG IK, GARCIA, DANIEL, MOUTTE, JAQUES, WILLIAMS, C. TERRY, WALL, FRANCES, KIM, YEADONG (2006) Pyrochlore chemistry from the Sokli phoscorite-carbonatite complex, Finland: Implications for the genesis of phoscorite and carbonatite association. GEOCHEMICAL JOURNAL, 40 (1) 1-13 doi:10.2343/geochemj.40.1 | Journal (article/letter/editorial) | | 40, pp. 1 to 13, 2006 Pyrochlore chemistry from the Sokli phoscorite-carbonatite complex, Finland: Implications...Implications for the genesis of phoscorite and carbonatite association MI JUNG LEE,1* JONG IK LEE,2 DANIEL...2, 2005) The phoscorite-carbonatite complex in the Sokli alkaline-carbonatite massif, northern Finland...assemblages. Pyrochlore is found in the majority of rock types in the Sokli phoscorite-carbonatite complex...Crystallization of pyrochlore begins from the P2-C2 phoscorite and calcite carbonatite and continues up |  | Starikova, Anastasia E., Bazarova, Ekaterina P., Savel’eva, Valentina B., Sklyarov, Eugene V., Khromova, Elena A., Kanakin, Sergei V. (2019) Pyrochlore-Group Minerals in the Granite-Hosted Katugin Rare-Metal Deposit, Transbaikalia, Russia. Minerals, 9 (8) 490 doi:10.3390/min9080490 | Journal (article/letter/editorial) | | minerals Article Pyrochlore-Group Minerals in the Granite-Hosted Katugin Rare-Metal Deposit, Transbaikalia...August 2019 Abstract: Pyrochlore group minerals are the main raw phases in granitic...%), ThO2 (to 1.8 wt.%), and PbO (to 1.4 wt.%). Pyrochlore of this type is very rare in nature and is limited...columbite. Secondary-I pyrochlore follows cracks or replaces primary pyrochlore in grain rims and is compositionally...complete A- and Y-sites occupancy. Secondary-II pyrochlore is a product of late hydrothermal alteration |  | Sun, Zhenghao, Qin, Kezhang, Mao, Yajing, Tang, Dongmei, Wang, Fangyue, Evans, Noreen J., Zhou, Qifeng (2022) Mineral Chemistry of Pyrochlore Supergroup Minerals from the Boziguoer Nb-Ta-Zr-Rb-REE Deposit, NW China: Implications for Nb Enrichment by Alkaline Magma Differentiation. Minerals, 12 (7) 785 doi:10.3390/min12070785 | Journal (article/letter/editorial) | | minerals Article Mineral Chemistry of Pyrochlore Supergroup Minerals from the Boziguoer Nb-Ta-Zr-Rb-REE...; Evans, N.J.; Zhou, Q. Mineral Chemistry of Pyrochlore Supergroup Minerals from the Boziguoer Nb-Ta-Zr-Rb-REE...aegirine). The Nb in the deposit is mainly hosted in pyrochlore supergroup minerals, ubiquitous in alkalic granite...in the A-site further classifies the Boziguoer pyrochlore supergroup minerals as fluornatropyrochlore,...fluorcalciopyrochlore and fluorkenopyrochlore. All Boziguoer pyrochlore supergroup minerals are Nb-rich and Ta-poor at |  | Pöml, P., Menneken, M., Stephan, T., Niedermeier, D.R.D., Geisler, T., Putnis, A. (2007) Mechanism of hydrothermal alteration of natural self-irradiated and synthetic crystalline titanate-based pyrochlore. Geochimica et Cosmochimica Acta, 71 (13) 3311-3322 doi:10.1016/j.gca.2007.03.031 | Journal (article/letter/editorial) | | self-irradiated and synthetic crystalline titanate-based pyrochlore P. Pöml b a,* , M. Menneken a, T. Stephan...2007; available online 13 April 2007 Abstract Pyrochlore-based ceramics are considered as a potential...fundamental mechanism of the equilibration of pyrochlore in aqueous solutions. We treated cuboids of a...metamict, i.e., self-irradiation-damaged Ti-based pyrochlore in 1 ml of a 1 M HCl solution containing 43.5%...into the cuboids. In the case of the natural pyrochlore an additional phase (aeschynite [(REE)(Ti, Nb)2(O |  | Atencio, D., Andrade, M. B., Christy, A. G., Giere, R., Kartashov, P. M. (2010) The pyrochlore supergroup of minerals: nomenclature. The Canadian Mineralogist, 48 (3) 673-698 doi:10.3749/canmin.48.3.673 | Journal (article/letter/editorial) | | 673-698 (2010) DOI : 10.3749/canmin.48.3.673 THE PYROCHLORE SUPERGROUP OF MINERALS: NOMENCLATURE Daniel ATENCIO§...Abstract A new scheme of nomenclature for the pyrochlore supergroup, approved by the CNMNC–IMA, is based...referred to until now as the pyrochlore group should be referred to as the pyrochlore supergroup, and the subgroups...Ta, Sb, Ti, and W. The recommended groups are pyrochlore, microlite, roméite, betafite, and elsmoreite...and one root name (identical to the name of the group). The first prefix refers to the dominant anion |  | | Journal (article/letter/editorial) | | Analogues of these varieties are present in many carbonatite complexes. The aim of this study was to investigate...strength elements during the late stages of carbonatite formation. We conducted a multilateral study...-polymorphs (anatase, brookite and rutile) and three pyrochlore group members (hydroxycalcio-, fluorcalcio-, and...in the Petyayan-Vara) and minerals of the pyrochlore group. This process also caused niobium enrichment...the late hydro (carbo) thermal stage of the carbonatite formation and high migration capacity of Ti and |  | Thompson, R., Smith, P., Gibson, S., Mattey, D., Dickin, A. (2002) Ankerite carbonatite from Swartbooisdrif, Namibia: the first evidence for magmatic ferrocarbonatite. Contributions to Mineralogy and Petrology, 143 (3) 377-396 doi:10.1007/s00410-002-0350-0 | Journal (article/letter/editorial) | | Gibson D.P. Mattey Æ A.P. Dickin Ankerite carbonatite from Swartbooisdrif, Namibia: the first evidence...phases, joined by trace amounts of intercumulus pyrochlore. Ankerite is zoned, from Ca(Mg, Fe2+)(CO3)2 cores...strontianite grains. Magnetite is close to pure Fe3O4. Pyrochlore has finescale euhedral oscillatory zoning and... ICP-MS analysis of magnetite and pyrochlore from the carbonatite allows calculation of their modal amounts...01) are appropriate for an 1,100-Ma magmatic carbonatite. Likewise, carbonate d18O=8.0 and d13C=–7.36 |  | | Journal (article/letter/editorial) | | From the perspective of Nb–Ta minerals, the pyrochlore supergroup minerals have significance for indicating...fluid evolution of alkaline rock or related carbonatite type Nb–Ta deposits. The Panzhihua–Xichang (Panxi)...fersmite, fergusonite-(Y), and especially pyrochlore group minerals) in samples from the Baicao and Xiaoheiqing...structure and compositional zoning. Four types of pyrochlore group minerals (pyrochlores I, II, III, and IV)...magmatic fractional crystallization stage. Anhedral pyrochlore III minerals are linked to the activity of magmaderived |  | | Journal (article/letter/editorial) | | island of São Vicente has the most abundant carbonatite outcrops in the Cape Verde Islands. A field survey...extrusive carbonatites, carbonatite dykes and small apophyses of intrusive carbonatite. These outcrops are...nephelinite crystallization and high-temperature carbonatite immiscibility. The carbonatitic melts crystallized...1993). São Vicente has the greatest number of carbonatite exposures (Gerlach et al., 1988), including calcitic...they must also be studied to fully understand carbonatite genesis. In this work we present field, petrographic |  | Lumpkin, G. R., Gao, Yan, Gieré, R., Williams, C. T., Mariano, A. N., Geisler, T. (2014) The role of Th-U minerals in assessing the performance of nuclear waste forms. Mineralogical Magazine, 78 (5) 1071-1095 doi:10.1180/minmag.2014.078.5.01 | Journal (article/letter/editorial) | | Th-U host phases such as brannerite, monazite, pyrochlore, zircon and zirconolite are resistant generally...host rocks. K EY WORDS : actinides, brannerite, carbonatite, davidite, granitic pegmatite, hydrothermal veins...veins, monazite, nuclear waste, perovskite, pyrochlore, thorium, uranium, zircon, zirconolite. Introduction...1976; Ringwood et al., 1979, 1981). Indeed, a group of materials referred to as ‘tailored ceramics’...waste-form phases and also studied in the laboratory: pyrochlore, zirconolite, brannerite, crichtonite (mainly |  | | Report (chapter) | | available data indicate that zirconolite and pyrochlore are excellent candidate host phases for actinides...well-known processing conditions. Although both pyrochlore and zirconolite become amorphous due to alphadecay...and their special purpose derivatives (e.g., pyrochlore, zirconolite, and hollandite) are reasonably...dissolution testing and radiation damage studies. Pyrochlore is the major component of Synroc-F, a polyphase...zirconolite, perovskite, murataite, magnetoplumbite Pyrochlore, perovskite, monazite, fluorite, intermetallic |
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