Results 181 to 190 of about 4,888 (235)
Some of the next articles are maybe not open access.
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.
openaire +2 more sources
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
openaire +1 more source
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
openaire +1 more source
THE HYDROTHERMAL RECRYSTALLIZATION OF METAMICT ALLANITE-(Ce)
The Canadian Mineralogist, 2010Samples of metamict allanite-(Ce) originating from granite pegmatites were recrystallized by heating in air and under hydrothermal conditions. Recrystallization in air resulted in partial recovery of the crystal structure at 650°C. Heating at higher temperatures resulted in decomposition of the allanite structure to a multiphase assemblage containing ...
Čobić, Andrea +3 more
openaire +3 more sources
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
Low-2V allanite and Mg-bearing allanite from the Kallmorberg mine, Norberg, Sweden
Geologiska Föreningen i Stockholm Förhandlingar, 1975Abstract Two varieties of allanite have been found in the Kallmorberg iron mine. Some optical data and the d-spacings of the specimens are given. Both allanites are completely unaltered and no metamictization has occurred, in spite of their Precambrian age. The content of radioactive elements is low. The rare-earth elements in the skarn rock containing
openaire +1 more source
Vanadian allanite-(La) and Vanadian allanite-(Ce) from the Hemlo gold deposit, Ontario, Canada
Mineralogical Magazine, 1991AbstractAllanite-(La) (containing up to 7.80 wt.% V2O3 and with La/ΣREE and La/Ce atomic ratios up to 0.54 and 1.45, respectively) and allanite-(Ce) (up to 8.46 wt.% V2O3) occur in close association with vanadian muscovite, barian tomichite and vanadian titanite in the main ore zone of the Hemlo gold deposit, Ontario, Canada.
Yuanming Pan, Michael E. Fleet
openaire +1 more source
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 ...
openaire +1 more source
“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 ...
openaire +1 more source
Sur la teneur en thorium d'une allanite
Bulletin de la Société française de Minéralogie et de Cristallographie, 1952Calcul du coefficient d'absorption des rayons α par l'allanite. Teneur en thorium et précision de la mesure.
openaire +3 more sources
Economic Geology, 1962
Small irregularly shaped aplitic allanite pegmatite bodies occurring near the contacts of a larger aplitic body with granodiorite are described. Allanite represents a considerable part of the pegmatite, is equally distributed, and can be regarded as a major constituent.
openaire +1 more source
Small irregularly shaped aplitic allanite pegmatite bodies occurring near the contacts of a larger aplitic body with granodiorite are described. Allanite represents a considerable part of the pegmatite, is equally distributed, and can be regarded as a major constituent.
openaire +1 more source