Results 101 to 110 of about 18,367 (247)

The role of Fe on the formation and diagenesis of interstratified glauconite-smectite and illite-smectite: A case study of Upper Cretaceous shallow-water carbonates [PDF]

, 2017
The widespread formation of interstratified glauconite-smectite (Gl-S) and illite-smectite (I-S) in modern and ancient diagenetic settings records the physicochemical conditions prevailing during clay mineral authigenesis.
Warr, Laurence N., Klaus Wemmer, Martin Dietzel, Wemmer, Klaus, Florian Mittermayr, Laurence N. Warr, Mittermayr, Florian, Andre Baldermann, Baldermann, Andre, Vasileios Mavromatis, Dietzel, Martin, Mavromatis, Vasileios   +11 more
core   +1 more source

Permian sedimentary sequence containing analcimolite and authigenic aegirine from the Boskovice Basin (Bohemian Massif, Czechia)

The Depositional Record, Volume 12, Issue 5, November 2026.
The Permian freshwater lacustrine sedimentary sequence rich in analcime, with unusual authigenic aegirine and NaFe3+ clinopyroxene. Product of ashfall directly linked with fossil accumulation (Konzentrat‐Lagerstätte). Abstract The Early Permian freshwater lacustrine sedimentary sequence in the vicinity of Bačov (Czechia) is world‐famous for its rich ...
Jakub Jirásek, Dalibor Matýsek, Martin Kašing, Daniel Šimíček   +3 more
wiley   +1 more source

Analytical Methodology to Determine Thermally Induced Soil Deformation From Laboratory Data

International Journal for Numerical and Analytical Methods in Geomechanics, Volume 50, Issue 16, Page 5868-5890, November 2026.
ABSTRACT Experimental laboratory investigations underlie most of the knowledge about the mechanics of soils under non‐isothermal conditions and their thermally induced deformation. Despite advances, the understanding of thermally induced deformation of soils remains inconsistent, hindering the development of a coherent framework that can advance ...
Jibril B. Coulibaly, Alessandro F. Rotta Loria   +1 more
wiley   +1 more source

Extração de ferro de esmectita brasileira com emprego do método ditionito-citrato-bicarbonato Iron extraction from Brazilian smectite by dithionite-citrate-bicarbonate method

Química Nova, 2000
A natural clay from Campina Grande region (Paraíba, Brazil), with 8.57% of Fe2O3, was used to study the most appropriate condition to carry out the iron extraction, without altering the clay structure in a significant way.
Sidnei Quezada M. Leite, Carlos Henrique A. Colodete, Lídia Chaloub Dieguez, Rosane A. S. San Gil   +3 more
doaj   +1 more source

Impact Crater Hydrothermal Systems Support Rapid Microbial Enrichment and Diverse Metabolic Potential

Geobiology, Volume 24, Issue 6, November/December 2026.
ABSTRACT Impact crater hydrothermal systems, formed after asteroid and comet impacts, have been proposed as promising habitats for life on early Earth and as key targets in the search for life on planetary bodies such as Mars, since they provide liquid water and active geochemical turnover.
Sabrina M. C. Hardy, Emily J. Aguilar‐Pine, Sean Gulick, Alaa Ahmad, Brett J. Baker, Nathalie Scott, Georgina Aitolo, Naomi Felton, Charles S. Cockell   +8 more
wiley   +1 more source

Mineralogia e geoquímica da ocorrência de palygorskita de Alcântara, bacia de S. Luís-Grajaú, Maranhão Mineralogy and geochemistry of occurrence of palygorskite of Alcântara, S. Luís-Grajaú basin, Maranhão, Brazil

Cerâmica, 2011
A Formação Alcântara (bacia de São Luis-Grajaú, região de Alcântara, MA) é constituída por pelitos, arenitos e dolomitos. Esses litotipos representam uma sucessão progradacional de depósitos de laguna/washover e canal de maré sobrepondo-se a depósitos de
K. B. Amorim, R. S. Angélica
doaj   +1 more source

Smectite Formation in the Presence of Sulfuric Acid: Implications for Acidic Smectite Formation on Early Mars [PDF]

, 2017
The excess of orbital detection of smectite deposits compared to carbonate deposits on the martian surface presents an enigma because smectite and carbonate formations are both favored alteration products of basalt under neutral to alkaline conditions ...
Agresti, D. G., Niles, P. B., Morris, R. V., Peretyazhko, T. S., Sutter, B., Le, L., Ming, D. W.   +6 more
core  

Contribution of long-term hydrothermal experiments for understanding the smectite-to-chlorite conversion in geological environments

, 2016
International audienceThe smectite-to-chlorite conversion is investigated through long-duration experiments (up to 9 years) conducted at 300 °C. The starting products were the Wyoming bentonite MX80 (79 % smectite), metallic iron and magnetite in contact
Charpentier, Delphine, Mosser-Ruck, Régine, Barres, Odile, Pignatelli, Isabella, Michau, Nicolas, Rousset, Davy, Bourdelle, Franck, Guillaume, Damien, Cathelineau, Michel, Abdelmoula, Mustapha, Pignatelli, Isabella (author), Cathelineau, Michel (author), Guillaume, Damien (author), Barres, Odile (author), Rousset, Davy (author), Abdelmoula, Mustapha (author), Charpentier, Delphine (author), Michau, Nicolas (author), Mosser-Ruck, Régine (author), Bourdelle, Franck (author)   +19 more
core   +1 more source

Revealing the Hydrothermal System of La Soufrière Volcano (Guadeloupe) Through Nodal Ambient Noise Tomography

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract La Soufri'ere de Guadeloupe is an active volcano of the Lesser Antilles Volcanic Arc. Its last eruption halted in 1977, yet hydrothermal activity has increased over recent years, raising summit instability hazards. The link between hydrothermal fluids and detachment landslide surfaces is well established and exacerbated by inflation ...
Elliot Amir Jiwani‐Brown, Iván Cabrera‐Pérez, Laurie Mischler, Douglas Stumpp, Geneviève Savard, Catherine Truffert, Alberto Rosselli, Federico Fischanger, Filippo Barsuglia, Matteo Lupi   +9 more
wiley   +1 more source

Mineralogical and physico–chemical properties of bentonites from the Jastrabá Formation (Kremnické vrchy Mts., Western Carpathians)

Geologica Carpathica, 2019
In the past years an increasing demand for bentonites resulted in the opening of new bentonite deposits in the Jastrabá Formation. The shortage of information, in particular analytical data, on the bentonites from the newly opened Jastrabá Fm.
Osacký Marek, Binčík Tomáš, Paľo Tomáš, Uhlík Peter, Madejová Jana, Czímerová Adriana   +5 more
doaj   +1 more source