Results 81 to 90 of about 10,713 (180)

Clay-associated organic matter in kaolinitic and smectitic soils

, 2002
The primary source of soil organic matter is plant debris of all kinds, such as dead roots, leaves and branches that enter into the soil and are then biologically decomposed at variable rates.
Wattel-Koekkoek, E.J.W.
core  

The Occurrence and Morphology of Naturally Occurring Respirable Mordenite Mineral Fibres in New Zealand

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 2, June 2026.
Mordenite is a naturally occurring zeolite mineral that is the seventh most common zeolite mineral globally, forming at low temperatures (≥100°C) in hydrothermal systems. In New Zealand, extensive deposits of mordenite are commonly associated with areas of hydrothermal alteration, particularly in the Coromandel and Taupo Volcanic Zones.
Ayrton R. Hamilton, Martin S. Brook, Anushka Elangasinghe, Debra Chappell, Janki P. Patel, Satendra Kumar, Rod Martin   +6 more
wiley   +1 more source

PRESSURE PREDICTION AND UNDERBALANCED DRILLING IN THE DEEPWATER NIGER DELTA [PDF]

, 2012
The mechanisms that cause overpressure can be broadly classified into two categories: loading and unloading. This study looks at eight wells from the deepwater Niger Delta; the wells were evaluated with three aims in mind. The first aim was to determine
GOODWYNE, OLAR,KAMAL
core  

One‐Step Fabricated Green Tubular Ceramic Membrane for Chromium (VI) Removal With High Permeability and Low Production Cost

ChemistrySelect, Volume 11, Issue 23, 18 June 2026.
ABSTRACT Large volumes of wastewater are released into the environment without proper treatment. Water pollution is linked to over 80% of diseases and deaths each year. Contamination by heavy metal ions arises from both natural sources and human activities.
Mhamed A. Aburawi, Almahdi A. Alhwaige, Afef Attia, Hajer Aloulou, Zahia Tigrine, Seif El Islam Lebouachera, Raja Ben Amar   +6 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

Metamorphic Dehydration, Fluid Pressure, and the Frictional‐Viscous Transition Along Subduction Megathrusts: Case Study in Cascadia and Implications for Slow Earthquakes

AGU Advances, Volume 7, Issue 3, June 2026.
Abstract Relative plate motion in subduction zones transitions from frictional slip to viscous flow with increasing depth and temperature. The frictional‐viscous transition can control the depth extent of megathrust earthquakes and episodic tremor and slip (ETS).
So Ozawa, Eric M. Dunham, Cailey B. Condit   +2 more
wiley   +1 more source

Smectite Dissolution Kinetics in High-Alkaline Conditions

, 2003
To determine the initial rates and effects of silica in solution on the dissolution kinetics of smectite, short- and long-term batch experiments (0.5 hour to 30 days) were completed at three temperatures (T = 25, 50, and 75°C) using stock solutions pH ...
Gento Kamei, Kathryn R. Spangler, Yumiko Watanabe, Hiroshi Ohmoto   +3 more
core   +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

New Insights Into Hikurangi Subduction Inputs and Megathrust Host Rocks Spanning Along‐Margin Changes in Fault Slip Behavior

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract The seismic behavior of subduction megathrusts varies spatially and is influenced by the properties of subducting plates, including their sedimentary cover. Characterizing these subduction inputs is essential for understanding the mechanisms behind fault slip variability.
Philip M. Barnes, Gareth J. Crutchley, Martin P. Crundwell, Stuart A. Henrys, Andrew Gase, Sam R. Davidson, Nathan Bangs, Harm Van Avendonk, Michael Underwood, Anthony E. Shorrock, Laura S. McDonald, Lorna J. Strachan, Helen C. Bostock   +12 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