... and tantalum have similar geochemical behaviours, a growing number of experiments and observations suggest that they are fractionated during magmatic processes. Nb/Ta ratios in most terrestrial rocks are variably subchondritic (<19.9 ± 0.6; Münker et al. 2003 ), which is known as the terrestrial Nb–Ta...

...Edward S. Grew Lithium is rare in the cosmos, but the formation of continental crust has concentrated lithium into economic deposits. The 124 recognized Li mineral species occur largely in four geologic environments: (1) lithium–cesium–tantalum (LCT) granitic pegmatites and associated metasomatic...

...Alysha G. McNeil; Robert L. Linnen; Roberta L. Flemming; Mostafa Fayek Abstract Niobium and tantalum, rare metals and high field strength elements (HFSEs) that are essential to modern technologies, are concentrated among others in lithium-cesium-tantalum (LCT) pegmatites and rare metal granites...

... (without Li or Ba) zoning. Cesium values increase from 200 to 1400 ppm from core to rim. Conversely, Sn and W values decrease toward the rim (50 to 10 and 100 to 10 ppm, respectively). Tantalum and Ti values show fewer variations but drop abruptly close to the rim of the grain (100 to 20 and 2000 to 500...

..., Siberian Branch of the RAS 2020 V.S. Sobolev IGM, Siberian Branch of the RAS rare-metal granites Ta and Nb deposits columbite tantalite Ta/Nb indicator ratio Tantalum and niobium are heavy lithophile metals. Their position in the same group of the periodic table of elements determines...

...% HF solution; solution B consisted of TaCl 5 dissolved in 2% HF. The dominant tantalum species in solution A at elevated temperatures was TaF 8 3– . In contrast, TaCl 6 – , which was the dominant complex in solution B at room temperature, disappeared as hydroxide complexes with an average ligand...

... such as tantalum, lithium and tin have an increasing demand due to their variety of uses in new technologies. To improve the prospecting tools for rare-metal ores in pegmatites are critical for the localization of undiscovered resources ( Linnen et al . 2012 ). In Galicia, northwestern Spain, several occurrences...

... of the world's resources of lithium, tantalum, cesium and beryllium. In contrast, the NYF pegmatites may be enriched in the rare earth elements (REE) and niobium, but they rarely contain economic resources of these metals. Compared with LCT pegmatites, NYF pegmatites have seen relatively little research...

...Dwight C. Bradley §   Corresponding author e-mail address : bradleyorchard2@gmail.com © 2019 Mineralogical Association of Canada 2019 lithium-cesium-tantalum pegmatites tectonics paleoclimate Appalachian orogen Why are lithium-cesium-tantalum (LCT) pegmatites...

... and subsolidus evidences at the SGIKER service of the University of the Basque Country (UPV/EHU), Spain. Niobium-tantalum oxides (CT) from the Tres Arroyos aplopegmatitic field mostly correspond to the columbite-(Fe) and columbite-(Mn) terms. The Mn/(Mn+Fe) ratio increases as fractionation proceeds...

... Cross–Uis pegmatite belt are classified as LCT type (lithium, caesium and tantalum) based on the classification of Černý and Ercit ( 2005 ). Some pegmatites show the hallmarks of LCT-type pegmatites whereas others, such as the intragranitic garnet–tourmaline pegmatites, show intermediate characteristics...

...., Bixler, J.N., Alam, T.M., & Nyman, M. (2007) An aqueous route to [Ta 6 O 19 ] 8– and solid-state studies of isostructural niobium and tantalum oxide complexes . In Soluble...

...Zeying Zhu; Rucheng Wang; Christian Marignac; Michel Cuney; Julien Mercadier; Xudong Che; Marc-Yves Lespinasse Abstract In rare-metal granites, niobium and tantalum are generally hosted by Nb–Ta oxides. However, in SE China, the Nb-specialized Huangshan granites are a unique occurrence in which Nb...

...Aleksandr S. Stepanov * E-mail: sashas@utas.edu.au Manuscript handled by Keith Putirka 5 6 2018 18 6 2018 Copyright © 2018 by the Mineralogical Society of America 2018 Mineralogical Society of America The metal tantalum (Ta) is becoming increasingly valued due...