Results 151 to 160 of about 3,322 (177)
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Bulletin de Minéralogie, 1981
On étudie la minéralisation niobium˗tantale associée aux pegmatites de granite et aux roches granitiques alcalines d'Afrique et on présente une sélection de 124 analyses chimiques de divers minéraux de niobium et de tantale rencontrés au cours de cette étude.
von Knorring, Oleg, Fadipe, Akinola
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On étudie la minéralisation niobium˗tantale associée aux pegmatites de granite et aux roches granitiques alcalines d'Afrique et on présente une sélection de 124 analyses chimiques de divers minéraux de niobium et de tantale rencontrés au cours de cette étude.
von Knorring, Oleg, Fadipe, Akinola
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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 +4 more
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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 +4 more
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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 +3 more
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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 +3 more
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Trace element distributions between the perthite phases of alkali feldspars from pegmatites
Mineralogical Magazine, 1982AbstractThe 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;
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Geochemistry: Exploration, Environment, Analysis, 2013
The phosphorus contents of alkali feldspars of 80 pegmatite veins from the Chinese Altay, NW China, were determined by electron microprobe in this study. The alkali feldspars of the barren pegmatites are poor in phosphorus and range from <0.01–0.05 wt% P 2 O 5 .
Tang Yong, Zhang Hui, Su Guizhen
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The phosphorus contents of alkali feldspars of 80 pegmatite veins from the Chinese Altay, NW China, were determined by electron microprobe in this study. The alkali feldspars of the barren pegmatites are poor in phosphorus and range from <0.01–0.05 wt% P 2 O 5 .
Tang Yong, Zhang Hui, Su Guizhen
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Canadian Journal of Earth Sciences, 1998
The 579.8 ± 2.2 Ma (40Ar-39Ar, muscovite) Georgeville Pluton in mainland Nova Scotia is an epizonal body consisting of alkali feldspar granite and related pegmatite. The pluton intrudes the ca. 619-608 Ma arc-related rocks of the Georgeville Group, which comprises part of West Avalonia, the largest terrane in the Canadian Appalachians.
J. Brendan Murphy +2 more
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The 579.8 ± 2.2 Ma (40Ar-39Ar, muscovite) Georgeville Pluton in mainland Nova Scotia is an epizonal body consisting of alkali feldspar granite and related pegmatite. The pluton intrudes the ca. 619-608 Ma arc-related rocks of the Georgeville Group, which comprises part of West Avalonia, the largest terrane in the Canadian Appalachians.
J. Brendan Murphy +2 more
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Contributions to Mineralogy and Petrology, 2010
Our study of fluid and melt inclusions in quartz and feldspar from granite pegmatite from the Precambrian Ronne granite, Bornholm Island, Denmark revealed extremely alkali bicarbonate- and carbonate-rich inclusions. The solid phases (daughter crystals) are mainly nahcolite [NaHCO3], zabuyelite [Li2CO3], and in rare cases potash [K2CO3] in addition to ...
Thomas, R., Davidson, P., Schmidt, C.
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Our study of fluid and melt inclusions in quartz and feldspar from granite pegmatite from the Precambrian Ronne granite, Bornholm Island, Denmark revealed extremely alkali bicarbonate- and carbonate-rich inclusions. The solid phases (daughter crystals) are mainly nahcolite [NaHCO3], zabuyelite [Li2CO3], and in rare cases potash [K2CO3] in addition to ...
Thomas, R., Davidson, P., Schmidt, C.
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Geochemistry, 1982
According to the evolution of alkali elements (e.g. K, Na, Li) and the relationship among them in the melt-solution of pegmatitic magma, the author divides the pegmatitic process for Vein No. 3 into three main geochemical stages associated with mineralization, i.e., K-Na, Na-Li and K stages.
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According to the evolution of alkali elements (e.g. K, Na, Li) and the relationship among them in the melt-solution of pegmatitic magma, the author divides the pegmatitic process for Vein No. 3 into three main geochemical stages associated with mineralization, i.e., K-Na, Na-Li and K stages.
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Geologica Macedonica, 2016
Selečka Mountain was thoroughly investigated in the past mostly because of the interesting mineral paragenesis presented in granites, gneisses, amphibolites, different schists and pegmatite bodies. In the valley Smilevski Dol, around 3 km SW from the village of Dunje (Mariovo plateau), in the vicinity of small spring Šohlehov Kladenec hydrothermal ...
Zebec, Vladimir +5 more
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Selečka Mountain was thoroughly investigated in the past mostly because of the interesting mineral paragenesis presented in granites, gneisses, amphibolites, different schists and pegmatite bodies. In the valley Smilevski Dol, around 3 km SW from the village of Dunje (Mariovo plateau), in the vicinity of small spring Šohlehov Kladenec hydrothermal ...
Zebec, Vladimir +5 more
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Alkali-rich replacement zones in evolved NYF pegmatites: metasomatic fluids or immiscible melts?
2019The attached document is the authors’ submitted version of the oral presentation. You are advised to consult the publisher’s version if you wish to cite from it.
Muller, A +4 more
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