Results 21 to 30 of about 4,836 (216)

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, M.A. Rassomakhin, V.A. Popov, A.M. Kuznetsov, S.M. Lebedeva   +4 more
doaj   +1 more source

Timing of diagenesis and very low-grade metamorphism in the eastern sector of the Sierra de Cameros (Iberian Range, Spain): a U–Pb SHRIMP study on monazite [PDF]

, 2009
The Sierra de Cameros is an intracontinental orogen and represents the north-western part of the Iberian Range in Northern Spain. It comprises a thick sequence of syn-rift continental sediments (mainly sandstones and carbonates) deposited during ...
Aleinikoff, Bollinger, Cabella, Casas-Sainz, Casquet, Cherniak, Del Río, Evans, Evans, Frantz, Förster, Gabudianu Radulescu, Gil-Imaz, Goldberg, Janots, Janots, Kempe, Krenn, Lanzirotti, Lev, Mantilla-Figueroa, Mas, Masuda, Mata, Mata, Mata, Milodowski, Montel, Pan, Pan, Parrish, Rasmussen, Rasmussen, Rasmussen, Rubatto, Sawka, Smith, Spear, Tera, Tischer, Wilby, Williams, Wing   +42 more
core   +2 more sources

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
doaj   +1 more source

Physicochemical Properties and REE Distribution of the Northwest and Central Greece Coal Deposits: A Review

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, Stavros Kalaitzidis, Petros Koutsovitis, Antonios Bouzinos, Christos Karkalis, Pavlos Tyrologou, Dimitris Karapanos   +6 more
doaj   +1 more source

Crystal chemistry of volcanic allanites indicative of naturally induced oxidation-dehydrogenation [PDF]

, 2010
The crystal chemistry of volcanic allanites from both the Youngest Toba Tuff (YTT), Sumatra, Indonesia and SK100 volcanic ash beds (SK100-VAB), Niigata, Japan has been examined by electron microprobe analysis (EMPA), Fourier-transform infrared ...
Akasaka Takeshi, Chesner Craig A., Hoshino Mihoko, Kimata Mitsuyoshi, Nishida Norimasa, Shimizu Masahiro, 木股 三善   +6 more
core   +1 more source

Syn-metamorphic folding in the Tauern Window, Austria dated by Th-Pb ages from individual allanite porphyroblasts [PDF]

, 2015
High-precision 232Th-208Pb dates have been obtained from allanite porphyroblasts that show unambiguous microstructural relationships to fabrics in a major syn-metamorphic fold in the SE Tauern Window, Austria.
Bickle, Christensen, Cliff, Droop, Droop, Droop, Exner, Glodny, Glodny, Gregory, Inger, Janots, Janots, Janots, Kurz, Nagel, Oberli, Reddy, Romer, Rubatto, Schärer, Smith, Smye, Smye, Sousa, Spear, Spear, Vance, Wing   +28 more
core   +1 more source

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, Lauro Montefalco, Gláucia Queiroga, Glenda Lira Santos, Mahyra Tedeschi   +4 more
doaj   +1 more source

On the identification of Ti-Ta-Nb-oxides in “wiikites” from Karelia [PDF]

, 2018
Purpose. With respect to the nature of Ti-Ta-Nb-oxides, which are included in the mineral associations that have historically gone by the now outdated name of “wiikites”, there is no unanimity of opinion.
Bogdanov, R, Goldwirt, D, Hosseinpour Khanmiri, M, Janson, S, Platonova, N, Polekhovsky, Yu   +5 more
core   +1 more source

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
doaj   +1 more source

Multidisciplinary study of thorium mobility: formation of turkestanite and steacyite analogues, and structural insights using an XRD-directed microcrystal preparation technique. [PDF]

Acta Crystallogr B Struct Sci Cryst Eng Mater
A novel focused ion beam and scanning electron microscope‐based technique has been developed for mounting microcrystals on carbon fibre, making them immediately compatible with single‐crystal X‐ray diffraction. This method has been successfully applied to studying the crystal chemistry of a synthetic Th‐bearing, Na analogues of turkestanite and ...
Stachowicz M, Bagiński B, Harlov DE, Jokubauskas P, Kotowski J, Matyszczak W, Dąbrowska A, Macdonald R.   +7 more
europepmc   +2 more sources