Results 101 to 110 of about 202 (128)

Effects and differences of various concentration techniques on the evolution of therapeutic components in Lushan geothermal water. [PDF]

Sci Rep
Zhang B, Fang Z, Xuan K, Ma W, Gao B, Liu Y, Huang D, Xie S, Ding Y.   +8 more
europepmc   +1 more source

Bioleaching of uranium from ores and rocks using filamentous fungi. [PDF]

Front Microbiol
Bhatti TM, Tuovinen OH.
europepmc   +1 more source

Experimental evidence reveals the mobilization and mineralization processes of rare earth elements in carbonatites. [PDF]

Sci Adv
Yuan X, Yang Z, Mayanovic RA, Hou Z.
europepmc   +1 more source

Trace element distributions between the perthite phases of alkali feldspars from pegmatites

Mineralogical Magazine, 1982
AbstractThe distribution of various trace elements between the K-feldspar and albite phases of perthites from several pegmatites was determined by ion microprobe. Ranges in distribution coefficients (wt. % in K-feldspar/wt. % in albite) are: Li, 1.2–780; Mg, 0.2–1.1; P, 0.1–17; Ca, 0.02–1.6; Cs, 32–820; Ba, 24–284; Pb, 1.6–30; Fe, 0.3–0.7; Rb, 59–5505;
Roger A. Mason
openaire   +2 more sources

Minerals of the gadolinite-(Y)-hingganite-(Y) series in the alkali granite pegmatites of the Kola Peninsula

Geology of Ore Deposits, 2014
Minerals of the gadolinite-(Y)-hingganite-(Y) series pertaining to the gadolinite-datolite group have been found in the alkali granite pegmatites of the Kola Peninsula. Gadolinite-(Y) is distinguished by its unique natural crystalline state. The unit-cell parameters of this mineral have elevated values as compared with those of gadolinite-(Y) from ...
L. M. Lyalina, E. A. Selivanova, Ye. E. Savchenko, D. R. Zozulya, G. I. Kadyrova   +4 more
openaire   +2 more sources

Alkali metal and rare earth element evolution of rock-forming minerals from the Gatumba area pegmatites (Rwanda): Quantitative assessment of crystal-melt fractionation in the regional zonation of pegmatite groups

Geochimica et Cosmochimica Acta, 2014
Abstract This study presents a general model for the evaluation of Rayleigh fractional crystallisation as the principal differentiation mechanism in the formation of regionally zoned common and rare-element pegmatites. The magmatic evolution of these systems from a granitic source is reconstructed by means of alkali element and rare earth element ...
Niels Hulsbosch, Jan Hertogen, Stijn Dewaele, Luc André, Philippe Muchez   +4 more
openaire   +2 more sources

Theoretical studies of the alteration of spodumene, petalite, eucryptite and pollucite in granitic pegmatites: exchange reactions with alkali feldspars

Contributions to Mineralogy and Petrology, 1993
The ratios Na/Li, K/Li, Na/Cs and K/Cs have been calculated for exchange equilibria among the Li and Cs silicates spodumene, petalite, eucryptite, and pollucite, and the alkali feldspars albite and K-feldspar plus quartz, in pure water and in chloride solutions at temperatures from 100° to 700°C and pressures from 0.5 to 4 kbar, using available ...
Williams-Jones, A. E., Wood, S. A.
openaire   +2 more sources

Distribution of rare alkali metals in chamber pegmatites as criterion in prospecting for optical fluorite and piezoquartz

International Geology Review, 1965
The distribution of rubidium and cesium in microcline-perthite was studied in five topaz- and fluorite-bearing zoned pegmatites. Determinations of mineral paragenesis aided in the interpretation of the results of the rare alkali metal determinations. The study lead to the following conclusions: 1) The Rb content in zoned fluorite and topaz pegmatites ...
Ye.D. Kalita
openaire   +2 more sources

Hydrated CO3-Bearing Analog of Manganoeudialyte from Alkali Pegmatites of the Konder Pluton, Khabarovsk Krai

Geology of Ore Deposits, 2018
The chemical composition, crystal structure, and infrared (IR) spectrum of a hydrated CO3-bearing analog of manganoeudialyte from alkali pegmatites of the Konder pluton (Khabarovsk krai) are studied. The chemical composition of the mineral corresponds to the formula N[Na6.94H2O5.13(Y,REE)0.58.
A. S. Osipov, A. A. Antonov, T. L. Panikorovskii, A. A. Zolotarev   +3 more
openaire   +2 more sources