Results 31 to 40 of about 3,944 (185)

Local Structures of Se and Br in Cretaceous–Paleogene Boundary Sediments and Concentration Effects of Ferrihydrite Originating From Impact Ejecta

Geological Journal, EarlyView.
Chemical states of Se and Br atoms in the KPg boundary sediments from Stevns Klint were studied using XAFS spectroscopy. The high concentrations of Se4+ could become an index of the degree to which the global environment was soiled with dust and ash derived from impact ejecta or volcanic eruptions.
Kei‐ichiro Murai, Akira Yoshiasa, Ginga Kitahara, Makoto Tokuda, Satoko Ishimaru, Toshihiro Moriga   +5 more
wiley   +1 more source

Maturation changes of hydrocarbons in solid parts of peloids from Serbian spas - catalytic influence of clay minerals [PDF]

Journal of the Serbian Chemical Society
The study focused on inspecting the composition of n-alkane, sterane and terpane biomarkers in healing mud (peloid) organic matter in the Rusanda, Bujanovac and Vranje spas. It was assumed that the catalytic influence of minerals on changes in biomarkers
Nikolovski Zlatko, Šajnović Aleksandra, Gajica Gordana, Burazer Nikola, Brčeski Ilija, Dabić Predrag, Jovančićević Branimir   +6 more
doaj   +1 more source

Automated particle analysis of D.B. Cooper's tie

Journal of Forensic Sciences, EarlyView.
Abstract Automated particle analysis (APA) using scanning electron microscopy (SEM) and energy‐dispersive x‐ray spectrometry (EDS) is a well‐known method in forensics, especially as it is applied to gunshot residue analysis. Here we describe the analysis of particles lifted from D.B. Cooper's tie, which was left on the hijacked plane in 1971.
Thomas G. Kaye, Kent L. Rhodes
wiley   +1 more source

Soil wetting and drying processes influence stone artefact distribution in clay‐rich soils: A case study from Middle Gidley Island in Murujuga, northwest Western Australia

Archaeometry, EarlyView.
Abstract Soils that contain swelling clay minerals (e.g., montmorillonite) expand and contract during wetting and drying, causing movement within the soil profile. This process, known as argilliturbation, can alter artefact distributions, destroy stratigraphy and complicate the interpretation of archaeological deposits.
Caroline Mather, Matthias Leopold, Kaitlin Sullivan, Kane Ditchfield, Tom Horrocks, Luke Gliganic, Emma Beckett, Diana Patalwala, Emielda Yusiharni, Michael Smirk, William Hiscock, Jo McDonald   +11 more
wiley   +1 more source

The Material Basis of 18th‐Century Meissen Porcelain

Archaeometry, EarlyView.
ABSTRACT In the summer of 1708, the quest for making hard‐paste porcelain from Saxonian clay and other mineral resources succeeded. This was achieved by applying as its essential ingredient newly discovered pure kaolin from Heidelsberg near Aue, western Saxon Ore Mountains.
Robert B. Heimann
wiley   +1 more source

Duodenal stricture and portal gas accumulation secondary to ulcerative, fibronecrotising duodenitis in a foal

Equine Veterinary Education, EarlyView.
Summary Gastroduodenal ulcer disease with secondary stricture formation of the proximal duodenum and portal gas accumulation is described in a neonatal foal. Conventional diagnostics were performed to reach a diagnosis, including gastroscopy, ultrasonography and positive contrast radiography. In addition, a post‐mortem CT was acquired with the contrast
R. F. Dash, G. Manso‐Diaz, A. Suarez‐Bonnet, M. Hewetson   +3 more
wiley   +1 more source

Coupled ESEM and XRD Analysis of Montmorillonite Hydration: Real-Time Swelling Quantification and Kinetic Characterization

NDT - Journal of Non-Destructive Testing
Understanding the hydration dynamics of montmorillonite clay minerals is critical for predicting their behavior in geotechnical and environmental applications.
J. Theo Kloprogge
doaj   +1 more source

The Unexpected Discovery of Paleocene? Coals in Outcrops Thought to Be Cambrian, Al Huqf, Oman

Journal of Petroleum Geology, EarlyView.
ABSTRACT Two brown organic deposits were encountered whilst investigating kaolinitic claystones thought to occur at the base of a Cambrian formation at outcrop. The age of these organic deposits is probably Paleocene from palynology. Organic petrography shows that they are subbituminous coals with some oil source potential.
Mohammed H. Al Kindi, Alan P. Heward, Lorraine B. Eglinton, Steve R. Packer, Darrin T. Stead   +4 more
wiley   +1 more source

Clay mineralogy and diagenesis of the Recent-Pleistocene volcanogenic sedimentary sequence of the Mexican Basin

Revista Mexicana de Ciencias Geológicas, 2018
Diagenesis of the Recent-Pleistocene volcanogenic depositional sequence of the Mexican Basin developed, in the gravel and sand strata, kaolinite, interstratified kaolinite/2H2O-smectite, opalC, 1H2O and 2H2O-smectite and Si-contaminated smectite ...
Liberto de Pablo-Galán, Juan J. de Pablo, M. de Lourdes Chávez-García   +2 more
doaj  

Composition of Smectite from Maastrichtian Sediment of the Afikpo Basin, southeast Nigeria

Journal of Applied Sciences and Environmental Management, 2019
The sand, silt, shale and clay fractions soils derived from Maastrichtian sediments in the Afikpo Basin, southeastern Nigeria exhibit unusually high cation-exchange capacities. Smectite was identified by X-ray diffraction in all sample fractions and was
A.N. Agibe, M.U. Uzoegbu, O.S. Ndukwe, V.A. Ndukwe   +3 more
doaj   +1 more source