 | 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) | | and rare earth minerals from the Virulundo carbonatite, Namibe, Angola L. TORRÓ1, 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...(REE) minerals (mainly synchysite-(Ce), britholite-(Ce), britholite-(La), cerite(Ce)). Cerium separated...WORDS : Angola, carbonatite, pyrochlore, REE, magmatic, hydrothermal, weathering, Virulundo. Introduction |  | | Journal (article/letter/editorial) | | Monte Verde Carbonatite–Alkaline–Agpaitic Complex (Angola) Sandra Amores-Casals 1,2, *, Antonio Olimpio Gonçalves...Universidade Agostinho Neto, Luanda, Caixa Postal 815, Angola; tonygoncalves72@hotmail.com Institut de Ciències...wöhlerite, eudialyte groups, as well as loparite-(Ce), occur in accessory amounts in nepheline trachyte...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 |  | 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 Carbonatites—The Bonga Complex (Angola) Minerals, 9 (10) 601 doi:10.3390/min9100601 | Journal (article/letter/editorial) | | Concentration in Carbonatites—The 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 |  | Uher, Pavel, Ondrejka, Martin, Bačík, Peter, Broska, Igor, Konečný, Patrik (2015) Britholite, monazite, REE carbonates, and calcite: Products of hydrothermal alteration of allanite and apatite in A-type granite from Stupné, Western Carpathians, Slovakia. Lithos, 236. 212-225 doi:10.1016/j.lithos.2015.09.005 | Journal (article/letter/editorial) | | primary magmatic allanite-(Ce) to ferriallanite-(Ce) and fluorapatite. The Y, Ce-rich fluorapatite was replaced...britholites. Moreover, the alteration of (ferri)allanite-(Ce) resulted to complex pseudomorphs and overgrowths...phases: [synchysite-(Ce) to its hydroxyl-dominant analogue “hydroxylsynchysite-(Ce)”, bastnäsite-(Ce)] and...and calcite, rarely monazite-(Ce), epidote, clinochlore, titanite, TiO2 phase, and pseudorutile. In some...some cases, secondary carbonate minerals (mainly synchysite and calcite) replaced a substantial part of former |  | 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) | | species in plutonic carbonatites: The Tchivira case, Angola Joan C. Melgarejo a, Alessandra Costanzo b,⁎, 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...SnO2 (Sn, Lα); barite (Ba, Lα); LaB6 (La, Lα); CeO2 (Ce, Lα); REE1 glass (Pr, Lβ); REE4 glass (Nd, Lα); REE3...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...pyrochlores. The rims are enriched in Zr, Ta, Th, Ce and U, but depleted in F and Na. In pyrochlores from...exsolution in the volcanic carbonatites. K EY WORDS : Angola, carbonatite, zonation in pyrochlore, fluorine,...carbonatites in Africa (Le Bas, 1971) extends into Angola where the majority of carbonatites crop out along...belong to the Paraná Angola Etendeka F IN CARBONATITIC PYROCHLORE Province and occur as ring complexes |  | 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) | | monazite, REE-Fcarbonates (bastnäsite, parisite, synchysite), ancylite, britholite, cordylite, fergusonite...fluorocarbonates, such as bastnäsite, parisite, and synchysite (e.g., Wall and Zaitsev 2004b; Kanazawa and Kamitani...minerals (Aldous 1980). Later, bastnäsite, parisite, synchysite, ancylite, monazite, Sr-REE apatite, and an unknown...mineral in the BCB, whereas ancylite (and minor synchysite) was described as the most abundant REE mineral...chondrodite chn (Mg,Fe)5(SiO4)2(F,OH)2 fluorbritholite-(Ce) bri Ca2(REE)3(SiO4)3(F,OH) olivine ol (Mg,Fe)SiO4 |  | Kozlov, Evgeniy, Fomina, Ekaterina, Sidorov, Mikhail, Shilovskikh, Vladimir, Bocharov, Vladimir, Chernyavsky, Alexey, Huber, Miłosz (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) | | lesser extent, strontianite, bastnäsite, and synchysite. Varieties of carbonatite that contain the highest...bastnäsite; 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 [7–9], Brazil Mongolia [52,53]...alkaline complexes of the Devonian Kola Alkaline Province [84]. The geological structure of this The Vuoriyarvi |  | 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, Rb–Sr, and Sm–Nd Isotope Data. Minerals, 11 (7) 711 doi:10.3390/min11070711 | Journal (article/letter/editorial) | | Siberia—White Winter, Middle Winter (East Sayan province); the Nb–REE Chuktukonskoe deposit (Chadobetsky... and aluminosilicate glasses doped with REE (La, Ce, Y, Sm, Pr, Nd); the concentrations of Mg, Ca, Si...Ti, Pb, La, Y were 0.075–0.1 wt%; Sr, U, Nb, Sm, Ce, Pr, Nd, Ta—0.15–0.2 wt%; and Na, Al, Si, P, Ca,...columbite groups, ilmenite, zircon, titanite, monazite-Ce. Rare-metal accessory minerals such as ilmenorutile...davidite-(Ce), britoliteCe, cerite-(Ce), cerianite-(Ce), bastnäsite-Ce, bastnäsite-(La), synchysite-(Ce), röntgenite(Ce) |  | | Journal (volume) | | February 1987 in Luc Yen (a small city in Yen Bai province, N- Vietnam), this country is an important source...from Burma. On the way from the capital of the province, which is also named Yen Bai, to Luc Yen, a new...and rose quartz from the Borborema Pegmatitic Province (Brazil) irradiated with high gamma doses Barreto...granitic pegmatities located in Borborema Pegmatite Province (BPP, Brazil), it is common to find areas of rose...admixtures in fulgurites elements-hydrolyzates La, Ce, Nd, Zr and also Br are slightly accumulated. Ba |
|
