Results 61 to 70 of about 666 (181)

Dielectric response of humid phlogopite

Bulletin of Materials Science, 1989
The dielectric response of phlogopite mica has been measured for frequency lying between 10 mHz and 10 kHz with humidity as a parameter. The measured complex capacitance shows a low frequency dispersion (LFD) at high humidities. A weak loss peak is also present at high frequencies and low humidity levels.
openaire   +2 more sources

Barium feldspar from Pukkiharju base-metal mineralization, central Finland [PDF]

Bulletin of the Geological Society of Finland, 1987
R. Lahtinen, B. Johanson
doaj   +1 more source

A phlogopite-amphibole-plagioclase bearing websterite from Guinadji volcano (Adamawa Plateau, Northern Cameroon): evidence of a cumulate origin and crustal event

Mineralogia
An unusual phlogopite-amphibole-plagioclase-bearing websterite xenolith has been sampled in an alkali basaltic pyrolastite from Guinadji volcano, SE Ngaoundéré, Adamawa plateau, northern Cameroon, eastern extension of the continental sector of the ...
Kagarabi Paterne Mulimbi, Ntaflos Theodoros, Tamen Jules, Nkouathio David G., Tumba Kaniki   +4 more
doaj   +1 more source

GEOCHEMICAL AND PETROLOGICAL STUDIES OF A CARBONATISED METALAMPROPHYRE AT KALAGALLA - EVIDENCE FOR SHOSHONITIC CALC-ALKALINE MAGMATISM WITHIN AURIFEROUS RAMAGIRI-PENAKACHERLA SCHIST BELT (2.5 Ga), EASTERN DHARWAR CRATON, SOUTHERN INDIA

Geochimica Brasiliensis, 2020
Geochemical and petrological characteristics of a lamprophyre dyke at Kalagalla intruded into the auriferous schistose rocks of the Ramagiri-Penakacherla Schist Belt, Anantapur district, Andhra Pradesh, India are presented here. The Kalagalla lamprophyre
Rameshchandra Phani Pothuri, Raúl Lira, María José Espeche, Ananda Reddy Rokalla   +3 more
doaj   +1 more source

The Compositional Evolution of the Phyllosilicates in the Lateritic Profile of the Catalão I Ultramafic Alkaline-carbonatitic Complex (GO) [PDF]

Geologia USP. Série Científica, 2010
The compositional evolution of the phyllosilicates in the lateritic profile of the Catalão I ultramafic alkaline-carbonatiticcomplex (GO) is proposed in this work based on petrographic and X-ray diffraction analysis, as well as, chemical ...
Rogério Guitarrari Azzone, Excelso Ruberti   +1 more
doaj  

High P‐T Sound Velocities of Amphiboles: Implications for Low‐Velocity Anomalies in Metasomatized Upper Mantle

Geophysical Research Letters
Metasomatized mantle xenoliths containing hydrous minerals, such as amphiboles, serpentine, and phlogopite, likely represent the potential mineralogical compositions of the metasomatized upper mantle, where low seismic velocities are commonly observed ...
Wen‐Yi Zhou, Ming Hao, Dongzhou Zhang, Przemyslaw Dera, Soisiri Charin, Jin S. Zhang   +5 more
doaj   +1 more source

Metasomatism and Melting of Cordilleran Lithosphere Resulting From Sediment Relamination During Shallow Subduction

Geochemistry, Geophysics, Geosystems
Mantle xenoliths recovered from the modern backarc region of the northern Altiplano Plateau record metasomatism by slab‐derived silicic melts, and a suite of Quaternary volcanics suggest that melting of accreted crustal material has persisted since ...
C. D. Hiett, D. L. Newell, J. W. Shervais   +2 more
doaj   +1 more source

The crystal structure of phlogopite by neutron diffraction

Mineralogical Magazine, 1974
SummaryThe positions of all the atoms including hydrogen have been found by a partial three-dimensional single-crystal neutron-diffraction study in which about one-third of the reflections in the reciprocal sphere to 1·5 Å were measured. The hydroxyl group is perpendicular to the plane of the silicate sheets.
openaire   +1 more source

First evidence of lamprophyric magmatism within the Subbetic Zone (Southern Spain)

Geologica Acta, 2010
Two drillings carried out at Cerro Prieto (Province of Málaga), together with additional geophysical data, revealed the existence of an igneous body formed of rock-types previously unknown in the Subbetic zone.
E. PUGA, L. BECCALUVA, G.L. BIANCHINI, A. DÍAZ DE FEDERICO, M.A. DÍAZ PUG, A.M. ÁLVAREZ VALERO, J. GALINDO ZALDÍVAR, J.R. WIJBRANS   +7 more
doaj  

Facial accessory of high-titanium magnezium-ferruginous micas as one of evaluation criteria of metamorphic and magmatic rocks rare-metall specialization

Литосфера, 2015
Type-chemical features of high-titanium magnezium-ferruginous micas of granulites, mafite-ultramafites, alkaline rocks, and carbonatites are considered.
A. I. Belkovsky
doaj   +2 more sources