Results 31 to 40 of about 3,332 (193)

Morphological Analysis of Quartz Grains of Two Horizons in a Ultisol, Paraná – Brazil (Análise morfológica de grãos de quartzo de dois horizontes de Argissolos, Paraná – Brasil)

, 2017
This research aimed to compare the surface morphology of quartz grains of the E and Bt horizons of an Ultisol of the Aratu stream basin, in the city of Florai, Parana.
Fabiana Cristina Meira Zaparoli, N. V. Gasparetto   +1 more
semanticscholar   +1 more source

INFLUÊNCIA DA QUALIDADE DA ÁGUA NA FLOTAÇÃO DE QUARTZO COM AMINA

Holos, 2010
O trabalho teve por objetivo estudar o efeito de cátions presentes na água utilizada no processo de flotação de quartzo. O estudo compara os resultados obtidos na flotação de quartzo antes e depois do tratamento de uma água contendo altos teores de ...
Viviane da Silva Pinheiro, Carlos Adolpho Magalhães Baltar, José Yvan Pereira Leite   +2 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

High-grade deformation in quartzo-feldspathic gneisses during the early Variscan exhumation of the Cabo Ortegal nappe, NW of Iberia

, 2015
Introduction Conclusions ...
F. J. Fernández, S. Llana-Fúnez, A. Marcos, P. Castiñeiras, P. Valverde-Vaquero   +4 more
semanticscholar   +1 more source

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

Geocronologia e petrotrama de quartzo milonitos do duplex transcorrente de Lavras da Mangabeira

, 2014
FREIMANN, M.A. Geochronology and milonites quartz fabric of the strike-slip duplex from Lavras 2014. Slices of metaplutonic rocks, banded gneiss, amphibolites and metasedimentary sequences form a strike-slip duplex situated in the west portion of the ...
M. A. Freimann
semanticscholar   +1 more source

Confirmation of the impact origin of the Late Ordovician Tvären impact structure (southeast Sweden) and emplacement of impactites in a marine setting

Meteoritics &Planetary Science, EarlyView.
Abstract The Tvären structure in southeastern Sweden has been listed as a confirmed marine‐target impact structure for decades. However, to date, no measurements and/or indexed data of planar deformation features in quartz grains from the structure have been published or any other unequivocal evidence of impact.
Katarzyna J. Gajewska, Sanna Alwmark, Mikael Calner, Sylvain Richoz, Jens Ormö, Erik Sturkell, Carl Alwmark   +6 more
wiley   +1 more source

Loess Studies in Aotearoa New Zealand

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 2, June 2026.
Loess in Aotearoa New Zealand (ANZ) has been studied since its first documented recognition (on Banks Peninsula) in 1878 by Julius von Haast. A decade later, John Hardcastle revealed that southern ANZ loess was both glacial in origin and contained signals of past climates.
Brent V. Alloway, David J. Lowe, Bradley J. Pillans, Peter C. Almond, Alan S. Palmer   +4 more
wiley   +1 more source

Neoarchean Arc Magmatism and Crust Recycling in the Northern Marginal Zone of the Limpopo Complex, Zimbabwe: New Insights From Zircon U‐Pb‐Hf Isotopes of a Charnockite Suite

Geological Journal, Volume 61, Issue 3, Page 566-592, March 2026.
Charnockites with 2691–2607 Ma magmatic ages from the NMZ show arc‐magmatic geochemical signatures. They correspond to the lower‐crustal equivalent of the Chilimanzi Suite Granite in the Zimbabwe Craton. Lu‐Hf isotopic data of magmatic zircons show negative εHf(t) values (−11.18 to −2.20) with TDMC ages of 3699–3158 Ma, suggesting their protolith ...
Toshiaki Tsunogae, Md. Sazzadur Rahman, Gao Pin, M. Santosh, Wataru Fujisaki, Sam Uthup, Prince Mandingaisa   +6 more
wiley   +1 more source