 | | Journal (article/letter/editorial) | | subsolidus compositional trends of columbite–tantalite in the beryl–columbite Šejby granitic pegmatite...Comenius University, Ilkovičova 6, 842 15 Bratislava, Slovakia; st.chladek@seznam.cz Corresponding author...K-feldspar unit. Primary magmatic CGM [columbite-(Fe)−tantalite-(Fe)], show an interesting compositional and textural...evolution. Subhomogeneous cores of columbite-(Fe)−tantalite-(Fe) (A) are surrounded by heterogeneous intermediate...compositions. Zone (B) contains grains of tapiolite-(Fe) and inclusions of pyrite decomposed into a mixture |  | | Journal (article/letter/editorial) | | Complex. Cassiterite, rutile, ilmenite and tantalite-(Fe) occur disseminated in the border facies of...Rayo: (i) granite-like pegmatites, with columbite-(Fe) I and II and cassiterite, in which the influence...crystallization of tantalite-(Fe), and (ii) greisen-like bodies, which contain high amounts of columbite-(Fe), columbite(Mn)...columbite(Mn), tantalite-(Mn) I and II as well as cassiterite. The primary oxide assemblage in both types...crystallization of the secondary assemblage, richer in Fe and Ta, is interpreted mainly as a consequence of |  | Anderson, M. O., Lentz, D. R., McFarlane, C. R. M., Falck, H. (2013) A geological, geochemical and textural study of an LCT pegmatite: implications for the magmatic versus metasomatic origin of Nb-Ta mineralization in the Moose II pegmatite, Northwest Territories, Canada. Journal of GEOsciences, 58 (4) 299-320 | Journal (article/letter/editorial) | | central portions of the pegmatite. Columbite–tantalite minerals occur throughout the pegmatite, excluding...patterns demonstrate an evolution from columbite to tantalite, whereby the Ta/(Ta + Nb) ratio increased with...progressive fractionation (0.13–0.59) but the Mn/(Mn + Fe) ratio remained nearly constant (0.15–0.31). The...evolution of the Nb- Ta oxides from columbite to tantalite is consistent with crystallization from a magmatic...fluid. Keywords: Moose II pegmatite, columbite–tantalite, Nb–Ta chemical evolution, muscovite trace-element |  | Roza Llera, Ana, Fuertes-Fuente, Mercedes, Cepedal, Antonia, Martin-Izard, Agustín (2019) Barren and Li–Sn–Ta Mineralized Pegmatites from NW Spain (Central Galicia): A Comparative Study of Their Mineralogy, Geochemistry, and Wallrock Metasomatism. Minerals, 9 (12) 739 doi:10.3390/min9120739 | Journal (article/letter/editorial) | | body show a trend from columbite-(Fe) to tantalite-(Fe) and tapiolite-(Fe). In this body, the Li-aluminosilicate...wallrock signature; Li–Sn–Ta pegmatite; columbite–tantalite; tantaliferous cassiterite; NW Spain spodumene;...vanadinite (Cl), andradite (Ca), MnTi (Mn, Ti), magnetite (Fe), apatite (P,F), SnO2 (Sn), ZnS (Zn), AsGa (Ga),...plotted on the triangular diagram as a function of Al (IV + VI)–R2+–Si (apfu), according to [25]. Chemical...almandine– spessartine solid solution with Mn/(Mn + Fe) ratios between 0.31 and 0.42. The most remarkable |  | | Journal (issue) | | J., RODA-ROBLES, E., VILLASECA, C., SIMMONS, W. Fe-Mn-(Mg) distribution in primary phosphates and silicates...Beryl in the West-Carpathian granitic pegmatites, Slovakia: compositional variations and post-magmatic alteration...differentiation of granitic magmas related to plutons in the region, or independently of plutonism by low-volume crustal...of the features of the continental crust in the region, and in particular the information on its overall... Sr, Nd and Pb isotope data on granites in the region. The continental crust of southern Norway and adjacent |  | | Journal (volume) | | of Szeged On the cover: Map of the Carpathian region with type localities of new mineral species, rocks...Mineralogical Society of Romania Geological Society of Slovakia, Mineralogical-Geochemical Branch Eötvös Loránd...(Romania) (Romania) (Austria) (Croatia) (Hungary) (Slovakia) (Greece) (Hungary) (USA) (Hungary) (Egypt) (Austria)...(Hungary) (Hungary) (Hungary) (Croatia) (Hungary) (Slovakia) (Serbia) (South Africa) (Austria) (France) (Hungary)...(Hungary) (Hungary) (Croatia) (UK) (Slovakia) (USA) (Austria) (Romania) (Slovakia) (China) (Germany) (Poland) |
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