Results 171 to 180 of about 1,895 (220)
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Monazite–allanite phase relations in metapelites
Chemical Geology, 2010Abstract Calculations of the transition from allanite to monazite-bearing assemblages in typical pelitic bulk compositions have been made using thermodynamic data estimated from oxide sums and inferred from natural parageneses. Calculations in the CFASHPCe and MnNCKFMASHPCe systems place the allanite to monazite transition in the middle amphibolite ...
Frank Spear
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Lithos, 2011 This study addresses the mechanical and chemical behavior of allanite during shear zone formation under high-pressure metamorphism. Understanding physico-chemical processes related to the retention or resetting of Pb isotopes in allanite during ...
Benedicte Cenki-Tok Or Cenki +2 more
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Sur la teneur en thorium d'une allanite
Bulletin de la Société française de Minéralogie et de Cristallographie, 1952 Calcul du coefficient d'absorption des rayons α par l'allanite. Teneur en thorium et précision de la mesure.
Coppens, René
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Ore Geology Reviews, 2023 Most ion adsorption rare earth element (REE) deposits (>85%) are light REE (LREE) enriched, but it is unclear whether the magmatic and hydrothermal activity have a control to the LREE mineralization, and why only some granitoids generate ion adsorption ...
Shuang Yan, Ning-Bo Li, Hecai Niu
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Journal of Radioanalytical and Nuclear Chemistry Articles, 1990
Allanites from Telixtlahuaca (Oaxaca, Mexico) were analyzed using the PIXE technique. The concentrations of 12 elements, mainly rare earths, were determined.
M. Jimenez-Reyes +3 more
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Allanites from Telixtlahuaca (Oaxaca, Mexico) were analyzed using the PIXE technique. The concentrations of 12 elements, mainly rare earths, were determined.
M. Jimenez-Reyes +3 more
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Geology of Ore Deposits, 2016
The morphology, optical properties, and composition of allanite-(Ce) and allanite-(Y) from raremetal tourmalinite of the Severnyi granitic pluton in the Chukchi Peninsula have been studied, as well as the composition and structure of host metasomatic rocks and the assemblage of rock-forming and accessory minerals.
V. I. Alekseev +2 more
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The morphology, optical properties, and composition of allanite-(Ce) and allanite-(Y) from raremetal tourmalinite of the Severnyi granitic pluton in the Chukchi Peninsula have been studied, as well as the composition and structure of host metasomatic rocks and the assemblage of rock-forming and accessory minerals.
V. I. Alekseev +2 more
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Recrystallization of metamict allanite
Mineralogical Magazine, 2011AbstractAllanite is a common accessory mineral in igneous rocks. Allanite becomes metamict over geological time-scales as a result of the α-decay of radioactive elements in the crystal structure. This study focuses on the recrystallization of metamict allanite from Savvushka, Russia.
Beirau, T., Paulmann, C., Bismayer, U.
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Allanite Geochemical Response to Hydrothermal Alteration by Alkaline, Low-Temperature Fluids
Minerals (Basel, Switzerland), 2020 Allanite is one of the main rare earth elements (REE)-rich accessory minerals in composite dykes from the granitoid pluton of Karkonosze. These dykes differ in composition from the bulk of the pluton by elevated rare earth elements (REE), Y, Zr, and ...
Katarzyna Gros +2 more
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The Canadian Mineralogist, 2002
“Allanite” is a poorly defined collection of species belonging to the epidote group. In the past, “allanite” was defined as merely being lanthanon-bearing, but more recently, it is defined as being Ln-dominant at the A2 site. Species of the allanite subgroup include allanite-(Ce), allanite-(La), allanite-(Y), androsite-(La), dissakisite-(Ce ...
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“Allanite” is a poorly defined collection of species belonging to the epidote group. In the past, “allanite” was defined as merely being lanthanon-bearing, but more recently, it is defined as being Ln-dominant at the A2 site. Species of the allanite subgroup include allanite-(Ce), allanite-(La), allanite-(Y), androsite-(La), dissakisite-(Ce ...
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Geological Society of America Bulletin, 1917
Introduction Many observers, both in this country and abroad, have noted the alteration exteriorly of allanite to usually a reddish brown product whose general appearance on casual examination seemed to be closely similar. This alteration is frequently conspicuous in localities where allanite is found at or near the surface in lumps and masses, and is
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Introduction Many observers, both in this country and abroad, have noted the alteration exteriorly of allanite to usually a reddish brown product whose general appearance on casual examination seemed to be closely similar. This alteration is frequently conspicuous in localities where allanite is found at or near the surface in lumps and masses, and is
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