... (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...

...% 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...

... 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...

... 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, with a drastic Mn-enrichment, whereas...

...Dwight C. Bradley Why are lithium-cesium-tantalum (LCT) pegmatites relatively common in some Phanerozoic orogenic belts but rare or absent in others? For example, the 3500-km-long Appalachian orogen, from Alabama and Newfoundland, has seventeen LCT districts, whereas the 8000-km-long Cordilleran...

... Central Galicia Spain Some rare elements 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...

... crystals are tapiolite in this figure). Pegmatites in the Cape 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...

... to [Ta 6 O 19 ] 8– and solid-state studies of isostructural niobium and tantalum oxide complexes . In Soluble Polytantalate Clusters ( Nyman M. & Anderson, T.M. eds.). Sandia Report SAND2007...

...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...

... Society of America 2018 Mineralogical Society of America The metal tantalum (Ta) is becoming increasingly valued due to its use in modern technology such as mobile phones and tablets. The major application of this metal is in tantalum capacitors, which have unrivaled performance-for-size and high...

... is properly cited. tantalum columbite–tantalite microlite wodginite N ew technologies, leading to the miniaturization of electronic devices, have resulted in the increased use of tantalum. Use of tantalum-based capacitors, in particular, is on the increase in automotive electronics, mobile...

... reported occurrence of a lithian tourmaline and lepidolite in the geologic record, as well as one of the two earliest known examples of the lithium–cesium–tantalum (LCT) family of pegmatites. The Sinceni magma is most plausibly derived from a metasedimentary source by intrusion of hot mantle melts...

... fluid flow through subducting slabs . Nature Geoscience , 5 , 489 – 492 . Marschall , H.R. , Dohmen , R. , and Ludwig , T. ( 2013 ) Diffusion-induced fractionation of niobium and tantalum during continental crust formation . Earth and Planetary Science Letters , 375 , 361...