 | | Journal (article/letter/editorial) | | continental collisions and magmatic activity in central Brazil as indicated by a magnetotelluric profile across...INPE, C.P. 515, 12201-970 São José dos Campos, Brazil a r t i c l e i n f o Article history: Received...13 December 2010 Keywords: Upper mantle Central Brazil Magnetotellurics Seismic low velocity anomaly Refertilization...along a 560 km E–W profile in a region of central Brazil subjected to Neoproterozoic collision tectonics...highlighted in the deep mantle beneath the APIP volcanic complex, coincident with a zone of low velocity defined |  | | Journal (article/letter/editorial) | | Weathered crusts overlying carbonatite complexes in Brazil and one hard rock carbonatite deposit in Canada...currently Mibra Mine, Volta Grande (Brazil), the Pitinga Mine (Brazil) and Marropinno (Mozambique). The...Papp (2009a, 2011a, 2013a) 1200 1000 Australia Brazil Canada 800 Rwanda Mozambique 600 Other World...Russia and India. Production comes primarily from Brazil. Production from Canada and other 500 400 300...and Papp (2009a, 2011b, 2013b) 70000 60000 50000 Brazil 40000 Canada 30000 Other World Total 20000 |  | | Journal (article/letter/editorial) | | there are only three operating Nbmines [Araxá and Catalão-II (Brazil) and St. Honoré (Canada)]. All produce...the primary sources. The Brazilian deposits at Araxá, Catalão-I and II, and Seis Lagos are examples of...Pekov, 2000) in the lujavrites of the Lovozero complex from which a concentrate with about 8 wt.% Nb2O5...Nb, due to the penchant for the element to form complex anions (NbO34 −; NbO76 −; Nb2O26 −) which cannot...Nb minerals whose structure is based upon these complex ions. Typically, basaltic rocks contain less than |  | | Report (issue) | | subsurface geology of the Saint-Honoré carbonatite complex in southern Quebec, Canada, and a schematic north-south...chart showing niobium resources and reserves in Brazil, Canada, and the United States...................minerals. Niobium is primarily derived from the complex oxide minerals of the pyrochlore group ((Na,Ca...lithium-cesium-tantalum (LCT)type pegmatites). Brazil and Canada are the leading nations that produce...produce niobium mineral concentrates, but Brazil is by far the leading producer, accounting for about 90 percent |  | | Journal (article/letter/editorial) | | youngest parts of a carbonatite-alkaline rock complex that formed during fractional crystallization of...2015 (Mt) Reserves (Mt) Igneous phosphorites Brazil Russia South Africa 6.04 11.00 2.16 6.70 12.50...phosphate rock is the Devonian Khibina Alkaline Complex in Russia’s Kola Peninsula (Fig. 2), with seven...rock production. Igneous phosphate deposits in Brazil, most associated with Cretaceous alkaline carbonatite...2016). Although the Paleoproterozoic Phalabora Complex in South Africa only produced 2.20 Mt (10%) in |  | | Report (issue) | | PLURINATIONAL STATE OF BOSNIA AND HERZEGOVINA BOTSWANA BRAZIL BRUNEI DARUSSALAM BULGARIA BURKINA FASO BURUNDI....................................... 38 6.4.3. Brazil..................................................solubility of thorium reaches 100 ppm as a sulphate complex (e.g. in Italy thorium was deposited in acid hot...comparatively simple composition, other minerals are complex in their mineralogical formula and are not repeated...Cu, Fe, Zr, Ti, U and others. Examples: Araxa in Brazil, Bayan Obo in China, Fen in Norway, Sokli in Finland |  | | Report (issue) | | rare-earth elements, and antimony in China; niobium in Brazil; and platinum-group elements in South Africa and...solubility of fluorite as a function of temperature for complex Na-Ca-Mg-Cl brines from ambient temperatures to...subsurface geology of the Saint-Honoré carbonatite complex in southern Quebec, Canada, and a schematic north-south...chart showing niobium resources and reserves in Brazil, Canada, and the United States...................showing the Rustenburg Layered Suite of the Bushveld Complex, South Africa, the surface trace of significant |
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