 | 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 |  | | 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 |  | 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 |  | 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...matrix-supported, with sharp-angle rock fragments and calcite matrix with similar accessory minerals to those...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,...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...by the Angola Namibia gabbro-anorthosite complex (Issa Filho et al., 1991) (Fig. 1). In Angola, carbonatites |  | 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) | | com/locate/lithos Britholite, monazite, REE carbonates, and calcite: Products of hydrothermal alteration of allanite...âhydroxylsynchysite-(Ce)â, bastnĂ€site-(Ce)] and calcite, rarely monazite-(Ce), epidote, clinochlore, titanite...secondary carbonate minerals (mainly synchysite and calcite) replaced a substantial part of former allanite...secondary minerals, mainly REE carbonate phases, calcite, and epidote, and more rarely by monazite, clinochlore...aggregates associated with REE carbonate (synchysite), calcite, and TiO2 phase (Fig. 2HâI). The monazite shows |  | | Journal (article/letter/editorial) | | pegmatite formation: evidence from the Keivy alkaline province, Kola peninsula, NW Russia Dmitry R. Zozulya 1...Springer-Verlag Wien 2017 Abstract The Keivy alkaline province, Kola Peninsula, NW Russia, consists of vast alkali...fluid of CO2 and/or H2O. Keywords Keivy alkaline province . Kola peninsula . Nepheline syenite . Pegmatite...pegmatite from the Late Archean Keivy alkaline province in the Kola Peninsula, NW Russia. It is noteworthy...and occurrence of pegmatite The Keivy alkaline province (Fig. 1) consists of aegirinearfvedsonite granites |  | 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) | | primary magnetite. BastnĂ€site is enclosed in primary calcite and dolomite. These three REE minerals are interpreted...processes, REE-bearing minerals (such as apatite, calcite, and dolomite) have to be distinguished from actual...Both the BCB and TCB are dolomite-bearing, but calcite-dominated with varying proportions of fluorapatite...carbonatites from the PCC and is much higher in REE than calcite and dolomite (Dawson and Hinton 2003). Early investigations...during later cooling. Precipitation of Mg-rich calcite started during the final stages of apatite formation |  | | Journal (article/letter/editorial) | | carbonate mineral, a carbonatite is referred to as a âcalcite carbonatiteâ, âdolomite carbonatiteâ (Figure 1)...increasing modal concentrations. For example, a âcalcite-dolomite carbonatiteâ is composed predominately... this can be reïŹected in the name as âbiotite-calcite carbonatiteâ. Where the modal classiïŹcation cannot...above which carbonatites contain more than 50% calcite on a molar basis. Although not universally accepted...and K) play an important role in the genesis of calcite and dolomite carbonatites, and ferrocarbonatite |  | | Journal (article/letter/editorial) | | Vuoriyarvi is one of the Devonian Kola Alkaline Province massifs [32]. Its concentrically zonal structure... near the Tukhta- and Neske-Vara tops, mostly calcite and, to a forming several separated fields. Thus... near the Tukhta- and Neske-Vara tops, mostly calcite and, to lesser extent, dolomite carbonatites and...above carbonatite bodies are close to those of calcite carbonatites (soevites) from the Petyayan-Vara...above carbonatite bodies are close to those of calcite carbonatites (soevites) from surroundings. However |  | | Journal (article/letter/editorial) | | characteristics of the Tarim Permian large igneous province rocks of NW China: Implication for the magmatic...mafic intrusions related to the ParanĂĄ Magmatic Province, Uruguay Muzio R., Scaglia F. & Masquelin H.,...and rare earth minerals from the Virulundo carbonatite, Namibe, Angola TorrĂł L., Villanova C., Castillo...from Linga area of the Eastern Deccan Volcanic Province, India Ganguly S., Ray J., Koeberl C., Ntaflos...fractionation between drip water and speleothem calcite: A 10-year monitoring study, central Texas, USA |  | | Journal (article/letter/editorial) | | sub-surface carbonatite. As the carbonate minerals (calcite and dolomite) are easily dissolved, Ca and Mg are...ankerite rim, ankerite, with minor amounts of calcite and siderite), barite, and purple polycrystalline...medium recrystallization and/or brecciation. Some calcite crystals have an alteration rim of Fe-rich carbonate...solubility ofisbarite is known increase in the calcite crystals have an alteration rim of Fe-rich which...barite crystalsdissolution showing in quartz and calcite in a REE-fluorocarbonate matrix from a depth of |  | | Journal (article/letter/editorial) | | pyroxene calcite carbonatite, magnetite apatite dolomite carbonate, magnetite apatite olivine calcite carbonatite...depending on whether the primary carbonate is calcite, dolomite, or siderite. Many carbonatites exhibit...melilitite-clan carbonatites; (3) kimberlite-clan calcite kimberlites; (4) the aillikiteâcarbonatite association;...net veining by later-formed urtites. The central calcite carbonatite is concentrically and vertically banded...agglomerates and ïŹnally by a circular plug of calcite carbonatite (Fig. 2). All of the silicate rocks |  | Lorenz, Melanie, Altenberger, Uwe, Trumbull, Robert B., Lira, RaĂșl, LĂłpez de Luchi, MĂłnica, GĂŒnter, Christina, Eidner, Sascha (2019) Chemical and textural relations of britholite- and apatite-group minerals from hydrothermal REE mineralization at the Rodeo de los Molles deposit, Central Argentina. American Mineralogist, 104 (12) 1840-1850 doi:10.2138/am-2019-6969 | Journal (article/letter/editorial) | | the major phase was discovered in the San Luis province of Argentina during follow-up of an aerial radiometric...together or sequentially. However, late fluorite-calcite-REE-fluorcarbonate veins cut across the primary...and rare earth minerals from the Virulundo carbonatite, Namibe, Angola. Mineralogical Magazine, 76(2),...(2015) Britholite, monazite, REE carbonates, and calcite: Products of hydrothermal alteration of allanite...Wall, F., Le Bas, J., and Srivastava, R.K. (1993) Calcite and carbocernaite exsolution and cotectic textures |  | | Report (volume) | | Fluoritebearing carbonatites are reported from Angola, Kenya, Morocco, Mozambique, Namibia, South Africa...generally associated with quartz, chalcedony, calcite, or barite; sphalerite and galena are the most...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 |  | | Journal (article/letter/editorial) | | DOI 10.1007/s00710-015-0390-6 ORIGINAL PAPER Calcite and dolomite in intrusive carbonatites. I. Textural...(micro)textural characteristics of carbonatitic calcite and dolomite in the context of magma evolution... Chakhmouradian et al. Table 1 Composition of calcite and dolomite from carbonatites: selected data from...70 58.35 Formulae (calculated to one cation for calcite and two cations for dolomite) Mg 0.064 0.107 0...95 56.44 Formulae (calculated to one cation for calcite and two cations for dolomite) Mg 0.968 0.719 0 |  | 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) | | formed. Simultaneously, strontianite, quartz, calcite, monazite, HREE-rich thorite, and Fe-hydroxides...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 |  | 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) | | veins associated with lesser barite, sulfides and calcite, controlled by NNEâSSW and NâS brittle faults and...also filling interstices between fluorite grains. Calcite is hosted by West Vein and several subsidiary fluorite...subhedral to euhedral crystals. In thin-section, some calcite (50%) and fluorite grains appear to share mutual...between the two; however, some calcite is partly replaced by fluorite. Calcite within Main Zone is restricted...is brecciation of these veins by fluorite and calcite only in West Zone, adjacent to the Yungul carbonatite |  | 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) | | British Columbia, Canada, is hosted by metamorphosed calcite and dolomite carbonatites of anorogenic afïŹnity...in heavy C and O isotopes relative to primary calcite, coupled with changes in the trace-element composition...rocks and their weathering products. For example, calcite and dolomite carbonatites contain, on average,...composed of texturally diverse dolomite carbonatites; calcite carbonatites are volumetrically minor and were...feldspathoid syenites) Nepheline syenites and calcite carbonatites (albitites, fenites and other alkali |  | 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...are represented by massive, fluidal, and taxite calcite varieties, with nepheline, potassium feldspar,...ilmenite, apatite, magnetite, pyrrhotite, and pyrite. Calcite carbonatites (sövites II) are leucocratic, coarse-grained...and pyrite. In fenites, vein and stockwork-like calcite carbonatites contain aegirine-augite, orthoclase...metasomatites and carbonatites. Carbonatites of dolomiteâcalcite composition (sövites III) contain amphiboles of |  | 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) | | Hefei University of Technology, Hefei, Anhui Province, China. These analyses were undertaken using an...pyrochlore supergroup minerals occur in pyroxenite, calcite carbonatite, silicate xenoliths and syenite. Hydrothermal...and rare earth minerals from the Virulundo carbonatite, Namibe, Angola. Miner. Mag. 2012, 76, 393â409....arfvedsonite granite, Ririwai Complex, Younger Granites province of Nigeria. J. Afr. Earth Sci. 2006, 44, 372â382...Implications for geodynamics of Tarim large igneous province. Int. Geol. Rev. 2020, 63, 1110â1131. [CrossRef] |  | | Book | | the Canary Islands, the North Atlantic Igneous Province and the Sunda Arc with a focus on magmatic crystals... e sövite-pegmatite, f syenite pegmatite with calcite. These speciïŹc samples were collected by Prof....SmedsgĂ„rden (treated with diluted HNO3 to dissolve calcite and apatite). See text for further details . ....4.8 combination of pristine and metasomatised calcite suites from the comparative data overlap with the.... Comparative, stable isotope (O, C) plot for calcite separates from the Alnö carbonatites indicated |  | | 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... and Maguire, P.K.H., eds., The Afar Volcanic Province within the East African Rift System: Geological |
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