Results 41 to 50 of about 10,594 (229)

Characterization of a complex carbonate-silicate apatite ore and its concentration by a two-stage anionic flotation method

REM: International Engineering Journal, 2022
A carbonate-silicate low weathering phosphate ore from an igneous origin deposit in Southeastern Brazil presents a challenge mainly for apatite flotation from its gangue minerals, calcite and dolomite, plus the presence of phlogopite, diopside, magnetite,
Isabel de Sousa Batista Carvalho, Paulo Roberto Gomes Brandao, Andreia Bicalho Henriques, Eliomar Evaristo Ferreira   +3 more
doaj   +1 more source

Glass forming ability and thermal stability of F-phlogopite based glasses [PDF]

, 2015
This paper presents the results of a study that analyses the effect of fluorine content on glass forming ability (GFA), glass stability (GS) and preferred crystallisation mechanism for a series of glasses in the SiO2-Al2O3-MgO-K2O-F system.
Casasola, Raquel, Pérez, Juan M., Romero, Maximina   +2 more
core   +1 more source

Chemical diffusion of fluorine in phlogopite

Geochimica et Cosmochimica Acta, 2022
Fluorine is a minor yet important component of volatiles in silicate minerals, and affects greatly the physicochemical properties of the host materials. The diffusivity of fluorine provides critical information for quantitatively understanding its many effects, but very few studies have been documented.
Zhang, Kai, Liu, Hanyong, Ingrin, Jannick, Zhang, Baohua, Yang, Xiaozhi   +4 more
openaire   +5 more sources

Ceramic Production and Geodiversity in Iron Age Iberia: An Archaeometric Study of Pottery from Castrejón de Capote (SW Spain)

Archaeometry, EarlyView.
ABSTRACT The hillfort of Castrejón de Capote is one of the best investigated settlements of Late Iron Age southwest Iberia. Located in the territory that the classical sources attributed to the Celtici, it was occupied between the early 4th and the 1st centuries bce.
Beatrijs de Groot, Luis Berrocal‐Rangel, Manuel Fernández‐Götz   +2 more
wiley   +1 more source

Laserprobe 40Ar/39Ar dating of strain fringes: Mid-Cretaceous synconvergent orogen-parallel extension in the interior of the Sevier orogen [PDF]

, 2008
[1] UV and CO2 laser-probe 40Ar/39Ar in situ analyses of phlogopite and muscovite in fibrous strain fringes from greenschist-facies metamorphic rocks document mica growth ages at temperatures lower than their closure temperatures, and therefore directly ...
Arriola, Tonia, Hoisch, Thomas D., Spell, Terry L., Wells, Michael L., Zanetti, Kathleen A.   +4 more
core   +4 more sources

Optical phonons, OH vibrations, and structural modifications of phlogopite at high temperatures: An in-situ infrared spectroscopic study [PDF]

, 2016
The thermal behavior of optical phonons and OH vibrations of phlogopite (a trioctahedral mica) was examined at temperatures up to 1000 K using in situ infrared spectroscopy.
Carpenter, Michael A., Lou, Xiaojie, Redfern, Simon A. T., Ren, Xiaobing, Salje, Ekhard K. H., Su, Wen, Tarantino, Serena C., Zhang, Ming   +7 more
core   +1 more source

Variable Sr Diffusion and Implications for Rb–Sr Biotite Geochronology

Journal of Metamorphic Geology, EarlyView.
ABSTRACT The rubidium–strontium (Rb–Sr) system has a long pedigree as a geochronological tool that relies on the application of an isochron approach. In particular, biotite contains strongly radiogenic Rb–Sr isotopes, and thus can yield meaningful crystallisation or cooling ages via this approach. However, the response of the Rb–Sr system in biotite to
Riley Rohrer, Christopher L. Kirkland, Hugo Olierook, Tim Johnson, Katy Evans   +4 more
wiley   +1 more source

Contact material for pressure-sintering ferrites [PDF]

, 1970
Pressure-sintering, in which the unfired laminated ferrite plane is placed between two flat punches and pressed during firing, reduces lateral firing shrinkage to less than one percent. A decrease in thickness of the laminate produces the required volume
Wentworth, C.
core   +1 more source

P–T Modelling Constrains the Depth of Emplacement of the Porto Azzurro Pluton and Implies Minor Exhumation Caused by the Zuccale Fault (Island of Elba, Italy)

Journal of Metamorphic Geology, EarlyView.
ABSTRACT Understanding the pressure of emplacement of granitic intrusions is crucial to understanding the exhumation history of plutons and constraining the tectonic setting of magma emplacement. However, P–T and geochronological constraints from exhumed plutons are often characterized by large uncertainties, especially in shallow crustal settings with
Samuele Papeschi, Marco Bonini, Matteo Lupi, Chiara Del Ventisette, Domenico Montanari   +4 more
wiley   +1 more source

Fission track studies on hornblende, biotite and phlogopite from Sweden [PDF]

Bulletin of the Geological Society of Finland, 1972
Fission track studies and K-Ar dating on three silicate minerals from Sweden have given the following results: Fission track age K—Ar age RM 07249 hornblende, Malmberget, Fragment 1 1255 m.y. 1875 m.y. » 2 450 » RM 620569 biotite, Ingelsbo Fragment 1 305
E. Welin, I. Lundström, G. Åberg
doaj   +1 more source