 | TorrĂł, 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) | | and rare earth minerals from the Virulundo carbonatite, Namibe, Angola L. TORROÌ1, C. VILLANOVA1, M. CASTILLO1...Agostinho Neto, Av. 4 de Fevereiro 7, 815 Luanda, Angola [Received 27 January 2011; Accepted 7 July 2011;...Editor: Hilary Downes] ABSTRACT The Virulundo carbonatite in Angola is one of the largest in the world...WORDS : Angola, carbonatite, pyrochlore, REE, magmatic, hydrothermal, weathering, Virulundo. Introduction...Introduction THE Virulundo carbonatite is one of the largest in the world (Woolley, 2001). Its remote location |  | Amores-Casals, , Melgarejo, , Bambi, , Gonçalves, , Morais, , Manuel, , Neto, , Costanzo, , Molist, (2019) Lamprophyre-Carbonatite Magma Mingling and Subsolidus Processes as Key Controls on Critical Element Concentration in CarbonatitesâThe Bonga Complex (Angola) Minerals, 9 (10) 601 doi:10.3390/min9100601 | Journal (article/letter/editorial) | | Concentration in CarbonatitesâThe Bonga Complex (Angola) Sandra Amores-Casals 1,2, *, Joan-Carles Melgarejo...Universidade Agostinho Neto, Luanda, Caixa Postal 815, Angola; aurorabambi@hotmail.com (A.B.); tonygoncalves72@hotmail...Verde [69,70]), hypabyssal (Bonga [67,68,70]; Virulundo [71]) and extrusive (Catanda; [67,68,72]). The...is one of the largest carbonatitic outcrops in Angola and worldwide [75], with well-known resources in...carbonatite, located SE of Quilengues, Huila Province, Angola (Figure 1), is a carbonatite-alkaline complex |  | Campeny, Marc, Kamenetsky, Vadim S., Melgarejo, Joan C., Mangas, JosĂ©, Manuel, JosĂ©, Alfonso, Pura, Kamenetsky, Maya B., Bambi, Aurora C.J.M., Gonçalves, Antonio O. (2015) Carbonatitic lavas in Catanda (Kwanza Sul, Angola): Mineralogical and geochemical constraints on the parental melt. Lithos, 232. 1-11 doi:10.1016/j.lithos.2015.06.016 | Journal (article/letter/editorial) | | Carbonatitic lavas in Catanda (Kwanza Sul, Angola): Mineralogical and geochemical constraints on...O., Carbonatitic lavas in Catanda (Kwanza Sul, Angola): Mineralogical and geochemical constraints on...MANUSCRIPT Carbonatitic lavas in Catanda (Kwanza Sul, Angola): mineralogical and geochemical constraints on...Geologia, Universidade Agostinho Neto, Luanda, Angola. Pura Alfonso, Dept. Enginyeria Minera i Recursos...Luanda, Angola. Antonio O. Gonçalves, Depto. Geologia, Universidade Agostinho Neto, Luanda, Angola. Abstract |  | | Journal (article/letter/editorial) | | Monte Verde CarbonatiteâAlkalineâAgpaitic Complex (Angola) Sandra Amores-Casals 1,2, *, Antonio Olimpio Gonçalves...Universidade Agostinho Neto, Luanda, Caixa Postal 815, Angola; tonygoncalves72@hotmail.com Institut de CiĂšncies...agpaitic minerals; eudialyte; rinkite; loparite; Angola 1. Introduction Undersaturated alkaline rocks...one of the least studied carbonatite complexes in Angola. As a few studies have reported, the Monte Verde...structure, such as Tchivira [25,26], Bonga [26â30], Virulundo [31], Bailundo [32], and Catanda [33]. Therefore |  | | Journal (article/letter/editorial) | | during supergene alteration of the Virulundo carbonatite, Angola, but this phase has not been approved...Superprovince, the Palaeogene Hebridean Igneous Province (Emeleus & Bell, 2005), consists of igneous centres...here). In our study, two coexisting ilmenite-magnetite pairs with sharp, clean contacts in the Rum Western...(2003): ILMAT: an Excel program for ilmenite-magnetite geothermometry and geobarometry. Comp. Geosci...The acid igneous rocks of the British Tertiary Province. Bull. Geol. Surv. G.B, 70, 10â22. Melluso, L |  | Melgarejo, Joan C., Costanzo, Alessandra, Bambi, Aurora C.J.M., Gonçalves, Antonio O., Neto, AndrĂ©s 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) | | species in plutonic carbonatites: The Tchivira case, Angola Joan C. Melgarejo a, Alessandra Costanzo b,â, Aurora...Geologia, Universidade Agostinho Neto, Luanda, Angola a r t i c l e i n f o Article history: Received...Tchivira carbonatite, located 400 km south of Luanda (Angola), is a good example of a carbonatite body produced...also present and consists of a coarse-grained magnetite, partly replaced by hematite. The outcrop conditions...Geological setting Most of the carbonatite complexes in Angola are found in the Lucapa structure (deVries Lapido-Loureiro |  | | Journal (article/letter/editorial) | | Agostinho Neto, Av. 4 de Fevereiro 7, 815 Luanda, Angola Earth and Ocean Sciences, School of Natural Sciences...exsolution in the volcanic carbonatites. K EY WORDS : Angola, carbonatite, zonation in pyrochlore, ïŹuorine,...(Mariano, 1989a; Woolley and Kempe, 1989). Apatite magnetite mineralization is associated with the early stages...carbonatites in Africa (Le Bas, 1971) extends into Angola where the majority of carbonatites crop out along...belong to the ParanaÌ Angola Etendeka F IN CARBONATITIC PYROCHLORE Province and occur as ring complexes |  | Uher, Pavel, Ondrejka, Martin, BaÄĂk, Peter, Broska, Igor, KoneÄnĂœ, Patrik (2015) Britholite, monazite, REE carbonates, and calcite: Products of hydrothermal alteration of allanite and apatite in A-type granite from StupnĂ©, Western Carpathians, Slovakia. Lithos, 236. 212-225 doi:10.1016/j.lithos.2015.09.005 | Journal (article/letter/editorial) | | zircon, ïŹuorapatite, allanite-(Ce), ilmenite, magnetite, and pyrite, together with secondary phases (Fig...alkali feldspars, biotite, allanite, zircon, and magnetite (Figs. 2A, E) and is occasionally over-rimmed...primary magmatic zircon (Zrn), ïŹuorapatite (Ap) and magnetite (Mt) in quartz (Qz), albite (Ab), annite (Ann)...20 0.76 1.07 0.05 â0.45 â0.01 99.59 Graciosa Province in Brazil (Vlach and Gualda, 2007). Generally...late-stage supergene alteration processes in Virulundo carbonatite, Angola (TorrĂł et al., 2012). The above-mentioned |  | Giebel, R. Johannes, Gauert, Christoph D.K., Marks, Michael A.W., Costin, Gelu, Markl, Gregor (2017) Multi-stage formation of REE minerals in the Palabora Carbonatite Complex, South Africa. American Mineralogist, 102 (6) 1218-1233 doi:10.2138/am-2017-6004 | Journal (article/letter/editorial) | | REETi-betafite occur as inclusions in primary magnetite. BastnĂ€site is enclosed in primary calcite and...varying proportions of fluorapatite, phlogopite, magnetite, forsterite/chondrodite, and accessory phases...textural differences (from fine banding of mainly magnetite, apatite, and phlogopite in BCB to large patchy...abundance in BCB; Figs. 3dâ3f) is followed by magnetite (with minor spinel and ilmenite; Figs. 3g and...main crystallization phase outlasting that of magnetite. A dolomite formation stage (Fig. 3l) existed |  | | Journal (article/letter/editorial) | | should be excluded from consideration, otherwise, magnetite and hematite-rich calciocarbonates or magnesiocarbonatites...carbonatites are: (1) British Columbia Alkaline Province, Canada (Pell 1994, Millonig et al. 2012); (2)...and one occurrence in Zambia); (b) Namibia and Angola; (c) Eastern Russia (East Tuva, Enisei, East Sayan...example the Ontario and Southwest Quebec carbonatite province covered by Woolley and Bailey (2012). Although...observed. Magmatic mineralisation (e.g. Nb, apatite, magnetite, and baddeleyite) is commonly hosted by early |  | Starikova, Anastasia E., Bazarova, Ekaterina P., Savelâeva, 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) | | [23,28,29]. Other minerals include ilmenite, magnetite, and sulfides (sphalerite, galena, pyrrhotite...mafic schists, quartzite and magnetite mafic schists, quartzite and magnetite quartzite); 20 = Kalar sequence...quartzite, and magnetite mafic granulite, clac-silicate rocks, quartzite, and magnetite quartzite; 21...quartz, albite, feldspar, aegirine, zircon, and magnetite. 4.1. Primary Pyrochlore The (#Nb) pyrochlore-group...arfvedsonite granite, Ririwai Complex, Younger Granites province of Nigeria. J. Asian Earth Sci. 2006, 44, 372â382 |  | | Journal (article/letter/editorial) | | Vuoriyarvi is one of the Devonian Kola Alkaline Province massifs [32]. Its concentrically zonal structure...Tukhta-Vara carbonatites a deposit of apatite-magnetite-forsterite and rare metal (baddeleyite) ores....deposit is close to include a deposit of apatite-magnetite-forsterite and rare metal (baddeleyite) ores....Russia). On the Neske-Vara upland, along apatite-magnetite ores, a deposit of niobium and tantalum exists...including more than 110 tons of with apatite-magnetite ores, a deposit of niobium and tantalum exists |  | | Journal (article/letter/editorial) | | process results in the decomposition of apatite and magnetite, removal of soluble carbonates and physical concentration...pyroxene calcite carbonatite, magnetite apatite dolomite carbonate, magnetite apatite olivine calcite carbonatite...(see below), and carbonatites in the East Sayan province, especially the Nizhnesayanskii and Bolshyetaginskoye...(Kogarko et al., 1995). Although the Kola Alkaline Province contains many carbonatites which have Nbpotential...with a steep inward dip, deïŹned by apatite and magnetite-rich streaks. The dolomite carbonatite dikes are |  | | Report (volume) | | Fluoritebearing carbonatites are reported from Angola, Kenya, Morocco, Mozambique, Namibia, South Africa...Africa, in Namibia (South West Africa), and in Angola and is associated with major fault zones in the...with alkaline intrusive rocks are reported from Angola, Kenya, Malawi, Morocco, Mozambique, Namibia, South...---------------------------- DeKun, 1965. trJ Angola Coola -------------------- 12°31' s. 15°16'E...31 °20' E. Fluorite is a minor constituent of magnetite-rich carbonatite of the Palabora Complex, which |  | Zozulya, Dmitry, Lyalina, Lyudmila, Macdonald, Ray, BagiĆski, BogusĆaw, Savchenko, Yevgeny, Jokubauskas, Petras (2019) Britholite Group Minerals from REE-Rich Lithologies of Keivy Alkali GraniteâNepheline Syenite Complex, Kola Peninsula, NW Russia. Minerals, 9 (12) 732 doi:10.3390/min9120732 | Journal (article/letter/editorial) | | Background and REE-Rich Occurrences The Keivy alkaline province consists of 2.67â2.65 Ga aegirine-arfvedsonite...map of the western part of the Keivy alkaline province, Kola Peninsula, Figure 1. Simplified map of the...the western of the Keivy alkaline associated province, with Kola NW Russia, showing geological the location...rocks Peninsula (boxed area). The of the Keivy province are extremely enriched in Zr (300â5000 ppm), Y...phases. Dozens of pegmatite bodies from the Keivy province are confined to the inner and outer apical parts |  | | Journal (article/letter/editorial) | | periclase in carbonatites implies that Mg-rich magnetite or Mg silicates (at higher SiO2 activities) precipitate... Degassing (reaction 1) and fractionation of magnetite and forsterite, for example, can increase the...burbankite (Brb)â eitelite (Eit)âcalcite inclusion in magnetite (Mgt) from calcite carbonatite; Sallanlatvi, Russia...the groundmass consists of calcite, apatite and magnetite; Kaiserstuhl, Germany (SB 1.5 mm). d Rounded autoliths...disaggregated autoliths of cumulate calcite, magnetite and apatite in Pleistocene extrusive carbonatite |  | Kozlov, Evgeniy, Fomina, Ekaterina, Sidorov, Mikhail, Shilovskikh, Vladimir, Bocharov, Vladimir, Chernyavsky, Alexey, Huber, MiĆosz (2020) The Petyayan-Vara Carbonatite-Hosted Rare Earth Deposit (Vuoriyarvi, NW Russia): Mineralogy and Geochemistry. Minerals, 10 (1) 73 doi:10.3390/min10010073 | Journal (article/letter/editorial) | | bastnĂ€site; metasomatism; Vuoriyarvi; Kola alkaline province 1. Introduction Rare-earth elements (REEs) are...earth carbonatites (RETherefore, carbonatites) in Angola [5,6], Australia for more 50% of the global resources...subjectNamibia of rare earth carbonatites (RE carbonatites) Angola [5,6], Australia [7â9], Brazil Mongolia [52,53]...alkaline complexes of the Devonian Kola Alkaline Province [84]. The geological structure of this The Vuoriyarvi...alkaline complexes of the Devonian Kola Alkaline Province [84]. The geological structure of this geochemically |  | Chakhmouradian, Anton R., Reguir, Ekaterina P., Kressall, Ryan D., Crozier, Jeremy, Pisiak, Laura K., Sidhu, Ravinder, Yang, Panseok (2015) Carbonatite-hosted niobium deposit at Aley, northern British Columbia (Canada): Mineralogy, geochemistry and petrogenesis. Ore Geology Reviews, 64. 642-666 doi:10.1016/j.oregeorev.2014.04.020 | Journal (article/letter/editorial) | | phases and associated heavy minerals (apatite ± magnetite ± zircon ± baddeleyite) precipitated early in...unsusceptible to ductile deformation (mostly, apatite and magnetite) contain relict grains of mechanically twinned...minor to major constituent of pseudomorphs after magnetite and phlogopite (Fig. 3dâf). Most dolomite carbonatites...proportion of siderite developed as pseudomorphs after magnetite and lining dissolution cavities. We interpret...carbonatite composed predominantly of calcite (Cal), magnetite (Mgt) and apatite (XPL); (e) partially dolomitized |  | Nedosekova, Irina, Vladykin, Nikolay, Udoratina, Oksana, Belyatsky, Boris (2021) Ore and Geochemical Specialization and Substance Sources of the Ural and Timan Carbonatite Complexes (Russia): Insights from Trace Element, RbâSr, and SmâNd Isotope Data. Minerals, 11 (7) 711 doi:10.3390/min11070711 | Journal (article/letter/editorial) | | SiberiaâWhite Winter, Middle Winter (East Sayan province); the NbâREE Chuktukonskoe deposit (Chadobetsky...pyrochlore core), zircon, ilmenite, apatite, magnetite, pyrrhotite, and pyrite. Calcite carbonatites...apatite and red pyrochlore, ilmenite, zircon, magnetite, pyrrhotite, and pyrite. In fenites, vein and...apatite, titanite, red pyrochlore, ilmenite, magnetite, pyrrhotite, pyrite, zircon, monazite, ortite... series, and accessory red-brown pyrochlore, magnetite, ilmenite, pyrrhotite, pyrite, zircon, and are |  | | Book | | the Canary Islands, the North Atlantic Igneous Province and the Sunda Arc with a focus on magmatic crystals...the northern end, fenites (b, c) are cut by a magnetite dyke (d). Wollastonite-rich rocks (eâh) follow...previously exploited for iron due to a high content in magnetite. It is said that Harry von Eckermann was . ....ïŹeldwork visits. c, d Pyroxenite types at SlĂ€da. eâh Magnetite at SlĂ€da . . . . Ă
sâforest road; nepheline syenite...(ac) and Alnö (acl) in Sweden; the Kola alkaline province (acl) in Russia; Sokli (cl) and Iivara (a) in |  | | Report (issue) | | Bailey and S. Kearns 12. Post-Paleozoic magmatism in Angola and Namibia: A review . . . . . . . . . . . . ...provinces of the Saharan zone, Cameroon volcanic line, Angola and Namibia, and the East African Rift system....and the Ethiopian-Yemenite âAfarâ flood basalt province (compiled from Schandelmeier and Reynolds, 1997;...compositionally related to the mainly alkaline province of intraplate magmatism in north Sudan and south...Weathering is restricted to hydro-oxidation around magnetite-ilmenite grains and to thin films that do not |  | | Journal (volume) | | nanoscale magnets. Specific strains of bacteria form magnetite (Fe3O4) or greigite (Fe3S4) crystals, or both...magnetic sensing in animals and the functions of magnetite particles in humans. A key challenge is the localization...composition of flotation waste consists of fayalite and magnetite with minimal amounts of copper and iron sulfide...dominantly as nanoparticles of Fe oxides such as magnetite. The XRF-XAS data here provide a composite of...February 1987 in Luc Yen (a small city in Yen Bai province, N- Vietnam), this country is an important source |  | | Report (issue) | | The given name for the occurrence or deposit. PROVINCE The major region political subdivision of the...POR ROM RWA AFGHANISTAN ALGERIA ANGOLA AFGHANISTAN ALGERIA ANGOLA ARGENTINA AUSTRALIA AUSTRIA BENIN...SUB-TYPE STATUS MINE-METH SOURCE LOCATION-GENERAL PROVINCE COUNTY LAT N/S LONG E/W UTM-ZONE EASTING NORTHING...-: MAP NUMBER ITATAIA COUNTRY - : BRAZIL PROVINCE -: LATITUDE -: CEARA <5°35'24"S -: BRA-031...< Disaster Peak ' or 15' quad) Physiographic Province A63 <|1 ,2 | | Basin and Range_______________________________> |
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