Results 171 to 180 of about 10,594 (229)
Some of the next articles are maybe not open access.
Weathering of phlogopite to beidellite in a karstic environment
American Journal of Science, 2009The extent of natural weathering of phlogopite crystals in a karstic environment and the composition of its weathering products have been examined through a multi-method investigation carried out on a volcanoclastic deposit discov- ered in the Grotta del Cervo cave, Pietrasecca, central Italy.
ALDEGA, LUCA +3 more
openaire +1 more source
The electret state of phlogopite
Russian Physics Journal, 1993An electret state of phlogopite is discovered. An investigation of the currents of thermostimulated depolarization and the currents of thermodepolarization shows that proton relaxation plays a part in its formation.
V. M. Timokhin +2 more
openaire +1 more source
Rare gases in a phlogopite nodule and a phlogopite-bearing peridotite in South African kimberlites
Earth and Planetary Science Letters, 1977Rare gas isotopes in a phlogopite nodule and a phlogopite-bearing peridotite nodule in South African kimberlites were studied to examine the state of rare gases in the deep interior of the kimberlite region. Within the experimental error of 1 ∼ 2%, rare gas isotopic compositions are atmospheric except for radiogenic4He and40Ar.
Ichiro Kaneoka +2 more
openaire +1 more source
Doklady Earth Sciences, 2017
Mantle xenoliths containing phlogopite and phlogopite–amphibole mineralization from kimberlites of the Kuoika field have been studied. Such xenoliths were found in two series of rocks: magnesian (Mg) pyroxenite–peridotite and Fe-type phlogopite–ilmenite hyperbasite.
L. V. Solov’eva +5 more
openaire +1 more source
Mantle xenoliths containing phlogopite and phlogopite–amphibole mineralization from kimberlites of the Kuoika field have been studied. Such xenoliths were found in two series of rocks: magnesian (Mg) pyroxenite–peridotite and Fe-type phlogopite–ilmenite hyperbasite.
L. V. Solov’eva +5 more
openaire +1 more source
Earth and Planetary Science Letters, 1967
Abstract High-pressure experiments have been made on the stability of natural and synthetic phlogopites by the tetrahedral-anvil type high-pressure apparatus in the pressure range from 41 to 96 kb (kilobars) and in the temperature range from 1030° to 1680°C. Water pressure is probably equal to or slightly lower than total pressure during the runs. It
I. Kushiro, Y. Syono, S. Akimoto
openaire +1 more source
Abstract High-pressure experiments have been made on the stability of natural and synthetic phlogopites by the tetrahedral-anvil type high-pressure apparatus in the pressure range from 41 to 96 kb (kilobars) and in the temperature range from 1030° to 1680°C. Water pressure is probably equal to or slightly lower than total pressure during the runs. It
I. Kushiro, Y. Syono, S. Akimoto
openaire +1 more source
The evaporation of potassium from phlogopite
Journal of Thermal Analysis, 1989The evaporation of potassium from phlogopite was investigated by roasting phlogopite with different chemical reagents. The possible reactions between reactants and the sample at different temperatures were investigated by thermogravimetry. Gypsum, calcite, sodium chloride, activated carbon, calcium chloride and fluoride were used as chemical reactants.
M. Khalighi, P. Minkkinen
openaire +1 more source
Phlogopite-based glass ceramics
Journal of Non-Crystalline Solids, 1986Abstract The technological process for preparing phlogopite-based glass ceramics was studied. The transformation of microstructure in the crystallization process, and the factors influencing the electrical properties of the material, are emphatically discussed.
Li Rounan, Zhu Peinan
openaire +1 more source
Phlogopite synthesis and stability range
Geochimica et Cosmochimica Acta, 1954Abstract A hydroxyl-bearing phlogopite has been synthesized and its upper stability limit determined up to 75,000 psi water vapour pressure. Above the upper stability limit the stable phases are forsterite + leucite + orthorhombic KAlSiO4 + vapour.
H.S. Yoder, H.P. Eugster
openaire +1 more source
Mössbauer study of Hungarian phlogopites
Hyperfine Interactions, 1990Ultramafic xenoliths of mantle origin occur in Hungarian Cretaceous lamprophyres. The aim of the present work was to determine the iron positions and their occupancy in phlogopites originated from ultramafic xenoliths by the help of Mossbauer spectroscopy.
E. Kuzmann +5 more
openaire +1 more source
Earth and Planetary Science Letters, 1978
Abstract 40 Ar/ 39 Ar analyses have been made on phlogopite-bearing peridotite nodules from Bultfontein and phlogopite nodules from Du Toitspan, Kimberley area, South Africa. Neither definite plateau nor isochron age could be obtained due to the occurrence of an excess 40 Ar in phlogopite.
I KANEOKA, K AOKI
openaire +1 more source
Abstract 40 Ar/ 39 Ar analyses have been made on phlogopite-bearing peridotite nodules from Bultfontein and phlogopite nodules from Du Toitspan, Kimberley area, South Africa. Neither definite plateau nor isochron age could be obtained due to the occurrence of an excess 40 Ar in phlogopite.
I KANEOKA, K AOKI
openaire +1 more source