Results 21 to 30 of about 334 (140)

Production and Characterization of Open Cell Cordierite from Boron and Waste Materials by Geopolymer Method for the Emission After Treatment System of Diesel Engines. [PDF]

Glob Chall
Open porous geopolymer‐based cordierite materials are produced due to the porous structure, temperature resistance, easy and low cost applications of geopolymer. For the composition of cordierite, waste boron clay, metakaolin, fly ash and magnesium carbonate are used, while keeping the geopolymerization temperature constant, sodium silicate, sodium ...
Ergun Y, Caliskan H, Karali HI.
europepmc   +2 more sources

Untangling the Primary Biotic and Abiotic Controls on Oxygen, Inorganic and Organic Carbon Isotope Signals in Modern Microbialites. [PDF]

Geobiology
ABSTRACT Microbialites are organo‐sedimentary structures formed throughout most of the Earth history, over a wide range of geological contexts, and under a multitude of environmental conditions affecting their composition. The carbon and oxygen isotope records of carbonates, which are most often their main constituents, have been used as a widespread ...
Havas R, Thomazo C, Caumartin J, Iniesto M, Bert H, Jézéquel D, Moreira D, Tavera R, Bettencourt V, López-García P, Vennin E, Benzerara K.   +11 more
europepmc   +2 more sources

Glyphosate adsorption on synthetic allophanes and halloysite: Effects of pH and mineral properties

Journal of Plant Nutrition and Soil Science, Volume 186, Issue 5, Page 568-579, October 2023., 2023
We studied glyphosate adsorption on halloysite and two different synthetic allophanes at pH 5‐7. Adsorption capacities of the allophanes increased with rising Al:Si content and they were generally larger than most other clays and (hydr)oxides tested so far. Abstract Background Glyphosate (GLP) is a widely used herbicide with possible adverse effects on
Vivian I. Remlinger, Katharina R. Lenhardt, Maria V. Rechberger, Thilo Rennert, Harald Rennhofer, Daniel Tunega, Franz Ottner, Max Willinger, Franz Zehetner, Martin H. Gerzabek   +9 more
wiley   +1 more source

Microbial influence on dolomite and authigenic clay mineralisation in dolocrete profiles of NW Australia

Geobiology, Volume 21, Issue 5, Page 644-670, September 2023., 2023
Abstract Dolomite (CaMg(CO3)2) precipitation is kinetically inhibited at surface temperatures and pressures. Experimental studies have demonstrated that microbial extracellular polymeric substances (EPS) as well as certain clay minerals may catalyse dolomite precipitation.
Caroline C. Mather, Heta M. Lampinen, Maurice Tucker, Matthias Leopold, Shawan Dogramaci, Mark Raven, Robert J. Gilkes   +6 more
wiley   +1 more source

In situ U–Pb geochronology of Pre‐Salt carbonates reveals links between diagenesis and regional tectonics

Terra Nova, Volume 34, Issue 4, Page 271-277, August 2022., 2022
Abstract Identification of processes driving carbonate diagenesis requires an accurate chronology, particularly along volcanic margins where complex mineral parageneses develop. The Cretaceous “Pre‐Salt” carbonates formed in the volcanic proto‐South Atlantic and are now extensive hydrocarbon reservoirs offshore Brazil and Angola. Primary and diagenetic
Nathan Rochelle‐Bates, Rachel Wood, Stefan Schröder, Nick M. W. Roberts   +3 more
wiley   +1 more source

Chemical controls on incipient Mg-silicate crystallisation at 25oC : implications for early and late diagenesis [PDF]

, 2014
Mg-silicate minerals (e.g., stevensite, kerolite, talc, sepiolite) play an important role in the construction of facies models in lacustrine and peri-marine environments because they are sensitive to changes in solution chemistry.
Tosca, Nick, Masterson, Andrew
core   +1 more source

Magnesium Isotope Fractionation During Silicate Weathering: Constrains From Riverine Mg Isotopic Composition in the Southeastern Coastal Region of China

Geochemistry, Geophysics, Geosystems, Volume 23, Issue 4, April 2022., 2022
Abstract Mg isotopic composition of river water is dominantly controlled by the dissolution of both silicate and carbonate sources and a series of biogeochemical processes. However, the relative importance of source and isotopic fractionation control at basin/global scale is poorly constrained.
Tong Zhao, Wenjing Liu, Zhifang Xu
wiley   +1 more source

Proton conductivity in Al-stevensite pillared clays [PDF]

, 2011
Fine stevensite mineral fraction (< 2 m) has been extracted from natural Moroccan ghassoulite clay. Thereafter, it has been pillared by Al13 polycations species.
Amjoud, M., Daoudi, L., Rhouta, B., Mezzane, D., Ech-chamikh, E., Kaddami, H., Alimoussa, A.   +6 more
core   +1 more source

Paleoenvironmental Implications of Authigenic Magnesian Clay Formation Sequences in the Barra Velha Formation (Santos Basin, Brazil) [PDF]

, 2022
The characterization of Mg-clays in rock samples (well P1) from the Barra Velha Formation (Early Cretaceous) allowed the establishment of mineral assemblages on the basis of their kerolite and Mg-smectite (stevensite and saponite) content.
André Mexias, Mexias, André, Wense Ramnani, Camila, Moraes Rios-Netto, Aristóteles de, Pozo Rodríguez, Manuel, Yaro Parizek-Silva, Paulo R. A. Netto, Manuel Pozo, Márcia Elisa Boscato Gomes, Boscato Gomes, Márcia Elisa, Leonardo Borghi, Netto, Paulo R. A., Silva, Maurício Dias da, Maurício Dias da Silva, Aristóteles de Moraes Rios-Netto, Camila Wense Ramnani, Parizek-Silva, Yaro, Borghi, Leonardo   +17 more
core   +1 more source

Thermal behaviour of stevensite at temperatures up to 800°C.

Bulletin of the Geological Society of Greece, 2016
Stevensite is a Mg-trioctahedral smectite with layer charge stemming from vacancies in the octahedral sheet. In the present work we studied the thermal behavior of Jbel Ghassoul stevensite from Morocco, known as Ghassoulite or Rhassoulite, free of talc layers.
Christidis, G. E., Koutsopoulou, E.
openaire   +3 more sources