 | 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...Editor: Hilary Downes] ABSTRACT The Virulundo carbonatite in Angola is one of the largest in the world...mineral in all of the carbonatite units (calciocarbonatites, ferrocarbonatites, carbonatite breccias and trachytoids)...quartz-carbonate-fluorite vein formation in the carbonatite, has produced a third generation of pyrochlore...depleted in Ca and Na. K EY WORDS : Angola, carbonatite, pyrochlore, REE, magmatic, hydrothermal, weathering |  | 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) | | 2012 Available online 28 June 2012 Keywords: Carbonatite Pyrochlore Niobium Magmatic Hydrothermal Supergenic...distribution. From the host rock to the centre of the carbonatite intrusion, the succession of alteration types...fluorite or as veinlets in fluoritized/silicified carbonatite. Minerals associated with Sr-, Ba- and Pb-pyrochlores...2004). These minerals are found in nearly all carbonatite types and their chemical composition is widely...number of pyrochlore compositions within the same carbonatite. This diversity in composition is interpreted |  | | Journal (article/letter/editorial) | | Manuscript Trace element partitioning between wollastonite and alkaline silicate magmas Céline Baudouin... France, Trace element partitioning between wollastonite and alkaline silicate magmas, Chemical Geology... RI PT Trace element partitioning between wollastonite and alkaline silicate magmas 1 MA NU SC...Abstract The partitioning of trace elements between wollastonite and melt provides a choice tool for understanding...associated lattice strain parameters between wollastonite and silicate magmas of Oldoinyo Lengai (Tanzania) |  | | Journal (article/letter/editorial) | | volcanic carbonatites. K EY WORDS : Angola, carbonatite, zonation in pyrochlore, fluorine, high field strength...mineralization is associated with the early stages of carbonatite activity and carbonatites are commonly rich in...or enrichment in Nb is a good criterion for carbonatite identification. Niobium is usually concentrated...concentrated in intermediate pulses of carbonatite activity (Kapustin, 1980). Pyrochlore-group mineral concentrates...from carbonatites. They are found in nearly all carbonatite types, at least in accessory amounts. Their chemical |  | | Book | | GeoGuide Peter Kresten Valentin R. Troll The Alnö Carbonatite Complex, Central Sweden GeoGuide Series editors... Peter Kresten Valentin R. Troll • The Alnö Carbonatite Complex, Central Sweden 123 Peter Kresten...works where a magmatic origin was proposed for carbonatite—alkaline silicate rock associations focused on...Archaean to the present. The only currently active carbonatite volcano, Oldoinyo Lengai (Fig. 1a) in the East...northern Tanzania, stands out from the other carbonatite occurrences in the world because of its unusually |  | | Journal (article/letter/editorial) | | Nb-rich perovskite (17–21 wt% Nb2O5) from the Oka carbonatite complex, Quebec, Canada (Cox & Wilton, 2006)...perovskite BM1963-732, locality: Oka, rock type: carbonatite 1/1 4.56 2132 186 7870 104,700 8632 18,320 1/3...(31.7–41.1). Reference perovskite BM1963 from carbonatite shows a clear dominance of U over Th in all measured...ites of Mt. Nyiragongo, Democratic Republic of Congo (Demant 885 et al., 1994), natrocarbonatites of...Eocene-Oligocene kimberlites from the Kundelungu Plateau, DR Congo. Earth Planet. Sci. Lett., 267, 609–619. Downloaded |  | | 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...the late hydro (carbo) thermal stage of the carbonatite formation and high migration capacity of Ti and...50 modal percent carbonate [1]. Varieties of carbonatite are named based on the dominant carbonate mineral...well. Most of the known carbonatite complexes have a common scheme of carbonatite genesis, whereby early |
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