Results 21 to 30 of about 537 (136)

Sintering and dielectric properties of a technical porcelain prepared from economical natural raw materials

Cerâmica
In this study, the production of a technical porcelain, for the ceramic dielectric applications by using economical natural raw materials, was investigated.
S. Kasrani, A. Harabi, S.-E. Barama, L. Foughali, M. T. Benhassine, D. M. Aldhayan   +5 more
doaj   +1 more source

Petrologia dos Stocks Santa Maria, Monte Pedral, Bom Jardim, Boa Esperança e Niterói, Suíte Intrusiva Serra do Catu, Estado de Sergipe, NE Brasil

Geologia USP. Série Científica, 2019
Os Stocks Monte Pedral, Boa Esperança, Santa Maria, Niterói e Bom Jardim situam-se na parte Norte do Sistema Orogênico Sergipano. Esses cinco corpos são constituídos por: álcali-feldspato sienito e quartzo álcali-feldspato sienito (Monte Pedral); quartzo
Hiakan Santos Soares, Carlos Santana Sousa, Maria de Lourdes da Silva Rosa, Herbet Conceição   +3 more
doaj   +1 more source

Characterization of amethyst applied to TL and OSL dosimetry

Brazilian Journal of Radiation Sciences, 2021
RESUMO Uma ametista é uma variedade geológica de quartzo (SiO2) e pode ser encontrada em abundância no Brasil. Sabe se o quartzo mostra uma luminescência intensa que é usada na remoção de sedimentos e é facilmente detectada na natureza, devido a essas ...
Noemi Aguiar Silva, Sonia Hatsue Tatumi, Alvaro de Farias Soares, Renata Faria Barbosa   +3 more
doaj   +1 more source

Selected Physical and Geotechnical Properties of Loess in Wairarapa Valley, New Zealand

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 4, December 2026.
Loess up to 10 m thick covers marine terraces, old river aggradation terraces, and gentle hill country slopes in Wairarapa, New Zealand. In the drier eastern and southern parts of Wairarapa, the loess is subject to dry summer and autumn and wet winter and spring in most years.
Alan S. Palmer
wiley   +1 more source

Composition and Provenance of Victoria Group Sandstones in Southern North Victoria Land, Antarctica

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 3, September 2026.
Three distinct source areas contributed to sandstones of the Victoria Group within the Transantarctic Basin in southern North Victoria Land. During the Permian, quartzose sandstones were derived from erosion of the local Ross Orogen, likely from an uplifted swell in the area of today's Ross Sea, the Ross High.
Martin Elsner, Robert Schöner, Reinhard Gaupp, Andreas Kronz, Benjamin Bomfleur, Joerg W. Schneider, Lothar G. Viereck   +6 more
wiley   +1 more source

Why Does the Broken Hill Deposit Sit in Resistive Crust? Magnetotelluric Evidence for Metamorphic Decoupling of a World‐Class Mineral System

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 9, September 2026.
Abstract The spatial association between electrical conductors and ore deposits underpins the widespread use of magnetotellurics (MT) in mineral exploration, yet not all mineral systems preserve a diagnostic conductive signature. Here, we present a high‐resolution MT study of the region hosting the world‐class Broken Hill Pb‐Zn‐Ag deposit (NSW ...
Yahya AlQahtani, Sinan Özaydın, Vasileios Chatzaras, Patrice F. Rey, Tiago Passos   +4 more
wiley   +1 more source

Visible to Near‐Infrared Properties of Felsic Rocks: Plagioclase Detection Limits and Applications to Mars Orbital Spectra

Journal of Geophysical Research: Planets, Volume 131, Issue 9, September 2026.
Abstract Widespread plagioclase detections on Mars using orbital visible to near infrared (VNIR) reflectance spectra have led to multiple interpretations of “feldspathic” terrain, ranging from ancient crustal material and evolved plutons to volcanic lava flows.
Hunter Vannier, Briony H. N. Horgan, Michael Phillips, Michael Eddy, Rebecca Greenberger, Arya Udry   +5 more
wiley   +1 more source

Os efeitos lubrificante e antilubrificante da água

Geotecnia, 1981
Referem-se estudos doutros autores sobre o efeito antilubrificante da água na fricção entre superfícies polidas de minerais de estrutura maciça (quartzo, feldspato, calcite) e o efeito lubrificante entre minerais de estrutura lamelar (micas, clorite ...
Úlpio Nascimento
doaj   +1 more source

Temperature Dependence of Fault Frictional Healing in Quartz Gouges at Hydrothermal Conditions

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 7, July 2026.
Abstract Fault healing allows the accumulation of stress along faults during interseismic periods. In this critical stage, temperature‐dependent fluid‐rock interactions within fault zones become crucial at seismogenic depth in controlling fault strength recovery. However, frictional healing at hydrothermal conditions is still underexplored.
G. Guglielmi, G. Di Toro, T. Tesei
wiley   +1 more source

Mineralogia dos greisens da área Grota Rica, Plúton Água Boa, Pitinga, Amazonas

Brazilian Journal of Geology
Resumo: O topázio-álcali-feldspato-granito, fácies mais evoluída do plúton Água Boa, foi afetado por processos de alteração hidrotermal, que culminaram com a formação de greisens e veios de quartzo, principais hospedeiros de mineralizações de Sn e ...
Gilmara Regina Lima Feio, Roberto Dall’Agnol, Régis Munhoz Krás Borges, Hilton Tulio Costi1, Claudio Nery Lamarão   +4 more
doaj   +1 more source