Results 31 to 40 of about 4,120 (208)
Frontiers in Earth Science, 2022 Fluids play a major role in facilitating igneous/metamorphic processes in the Earth’s crust and mantle. In this study, we investigate the nature and composition of fluids in Earth’s interior by studying the lower crustal rocks.
Vinod O. Samuel +4 more
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Minerals-concentrators of rare-earth elements in basites-ultrabasites intrusives of Norilsk district
Известия высших учебных заведений: Геология и разведка, 2017 The conditions of being, the history of formation and transformation of minerals-concentrators of rare-earth elements (REE) - apatite minerals group and epidote minerals group, have been studied and described.
Yu. D. Gritsenko, A. A. Serova
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KUKHARENKOITE-(Ce) AND ITS MINERAL ASSEMBLAGE IN PEGMATITES OF THE VISHNEVYE MOUNTAINS (SOUTH URALS) [PDF]
Минералогия, 2021 A rare Ba and REE fluorocarbonate kukharenkoite-(Ce) Ba2 Ce(CO3 )3 F with empirical formula (Ba1.88Sr0.17)2.05(Ce0.53La0.31Nd0.11)0.95(CO3 )3 F was found in alkali pegmatite of vein no. 35 in the Vishnevye Mountains, South Urals. Kukharenkoite-(Ce) forms
V.I. Popova +4 more
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Apatite, monazite and allanite; three rare earth minerals from Korsnäs, Finland [PDF]
Bulletin of the Geological Society of Finland, 1972 In the RE-bearing lead deposit of Korsnäs, apatite is the most common RE-mineral, monazite is a widespread accessory and allanite is a rare constituent. The paper describes one type of each.
H. Papunen, O. Lindsjö
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Materials Proceedings, 2022 This review presents a mineralogical and physicochemical comparison of coal seams located in the regions of Northwest and Central Greece. The comparison extends to the fly ash derivatives from the coal combustion for energy production, in the cases where
Nikolaos Koukouzas +6 more
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Trace element fractionation between biotite, allanite, and granitic melt
Contributions to Mineralogy and Petrology, 2021 The partitioning of a large suite of trace elements between biotite and water-saturated granitic melt was measured at 2 kbar and 700—800 ˚C. To reach equilibrium and to grow biotite crystals large enough for analysis, runs usually lasted from 30 to 45 ...
P. Were, H. Keppler
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Multi-method characterization of rare blue quartz-bearing metavolcanic rocks of the Rio dos Remédios Group, Paramirim Aulacogen, NE Brazil [PDF]
Brazilian Journal of Geology, 2023 The Rio dos Remédios Group comprises a supracrustal sequence that occupies the base of the Espinhaço Supergroup, São Francisco Craton, Brazil. Its basal formation, Novo Horizonte, crops out in the Paramirim region mainly as metavolcanic rocks that ...
Danielle Cruz da Silva +4 more
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Allanite at high temperature: effect of REE on the thermal behaviour of epidote-group minerals
Physics and chemistry of minerals, 2021 The thermal behaviour of a natural allanite-(Ce) has been investigated up to 1073 K (at room pressure) by means of in situ synchrotron powder X-ray diffraction and single-crystal neutron diffraction.
G. Gatta +6 more
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Layering in rapakivi granite, SW Finland [PDF]
Bulletin of the Geological Society of Finland, 1974 Layering in rapakivi granite occurs locally in the islet Söderören, Åland, SW Finland. The layering consists of 3—5 cm thick, rhythmically repeated layers with high concentrations of biotite, hornblende, allanite and olivine.
C. Ehlers
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The Polumir granite: Addititional data on its origin [PDF]
Geološki Anali Balkanskoga Poluostrva, 2002 The Polumir granite is exposed on several localities due to erosion, and its chemical and mineral composition is presented in this paper. It is built of K-feldspar, plagioclase, myrmekite, metasomatic albite, biotite, muscovite and quartz, while apatite,
Vukov Milenko S., Milovanović Dragan
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