... , 855 – 858 . Aulbach , S. , O’Reilly , S.Y. , Griffin , W.L. , and Pearson , N.J. ( 2008 ) Subcontinental lithospheric mantle origin of high niobium/tantalum ratios in eclogites . Nature Geoscience , 1 , 468 – 472 . Ballouard , C. , Poujol , M. , Boulvais , P...

... 2022 This work is licensed under a Creative Commons Attribution 4.0 International License at https://creativecommons.org/licenses/by/4.0/ . Lithium tin tantalum pegmatite Zimbabwe The Canadian Mineralogist Vol. 60, pp. 1-31 (2022) DOI: 10.3749/canmin.2100032 1 THE MAGMATIC HYDROTHERMAL...

...-beryl zone ( Fig. 2a ), and an Li-mineralized quartz-albite-spodumene zone ( Figs. 2a , 4a , c; Xinjiang Geological Bureau, unpub. report, 1982), similar to the classic regional zonation of a lithium-cesium-tantalum (LCT)-type pegmatite field around its causative granite ( Černý, 1989 ). Fig. 4...

... fluid production in the Larderello geothermal field (Italy) at depths between 2.3 and 4 km . Chemical Geology 237 : 303 – 328 . Borodulin GP , Chevychelov VY , Zaraysky GP. 2009 . Experimental study of partitioning of tantalum, niobium, manganese, and fluorine between...

... niobium 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...

...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...

... – 118 . Möller , P. , Dulski , P. , Szacki , W. , Malow , G. , and Riedel , E. ( 1988 ) Substitution of tin in cassiterite by tantalum, niobium, tungsten, iron and manganese . Geochimica et Cosmochimica Acta , 52 , 1497 – 1503 . Moscati , R.J. , and Neymark...

... 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 their similar properties and similar behavior in geologic processes. These elements have close atomic radii...

...% 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...

...Dwight C. Bradley lithium-cesium-tantalum pegmatites tectonics paleoclimate Appalachian orogen §   Corresponding author e-mail address : bradleyorchard2@gmail.com © 2019 Mineralogical Association of Canada 2019 Fig. 1. Schematic cross section of a variably exhumed...

...Idoia Garate-Olave; Encarnación Roda-Robles; Pedro Pablo Gil-Crespo; Alfonso Pesquera © 2019 Mineralogical Association of Canada 2019 aplopegmatite Nb-Ta oxides Central Iberian Zone Tres Arroyos Niobium-tantalum oxides (CT) from the Tres Arroyos aplopegmatitic field mostly...