Results 71 to 80 of about 105,423 (180)

Pedogenic Iron Oxides in Iron-Rich Oxisols Developed from Mafic Rocks

Revista Brasileira de Ciência do Solo
Despite the considerable amount of information on the mineralogical characteristics of pedogenic Fe oxides in Brazilian soils, there are few studies on Fe-rich soils developed from mafic rocks with taxonomic identities at lower categorical levels.
Danilo de Lima Camêlo, João Carlos Ker, Maurício Paulo Ferreira Fontes, Marcelo Metri Corrêa, Antonio Carlos Saraiva da Costa, Vander Freitas Melo   +5 more
doaj   +1 more source

Constitutive equation for Young’s modulus in clay-rich rocks: adding complexity, reducing uncertainty

Environmental Earth Sciences
Abstract Clay-rich rocks such as marls and claystones are of great interest for many applications which include the storage of CO2 or the storage of spent nuclear fuel. These rocks are either regarded as potential host rocks or as caprocks.
Sandra Schumacher, Werner Gräsle
openaire   +1 more source

Discovery of the Ordovician Kinnekulle K-bentonite at the Põõsaspea cliff, NW Estonia [PDF]

Estonian Journal of Earth Sciences, 2008
A previously unknown outcrop of the Kinnekulle K-bentonite (metabentonite) is reported from the Põõsaspea cliff, NW Estonia. The bed has a sharp lower and a gradational upper contact and comprises ca 28 cm of clay overlain by ca 10 cm of hard K-feldspar ...
Hints, Linda, Männik, Peep, Hints, Olle, Hints, Rutt   +3 more
doaj  

Mineralogy and provenance of red clay soils in Barind and Madhupur clay formations, Bangladesh: Implications for tectonic setting and chemical weathering

Journal of Asian Earth Sciences: X
This study investigates the geochemical and mineralogical properties of the Barind and Madhupur clay formations in the Bengal Basin, focusing on their provenance, tectonic setting and weathering processes in relation to regional geological evolution ...
Md.Golam Mostafa, Md.Aminur Rahman, Pradip Kumar Biswas, Abu Reza Md. Towfiqul Islam, Md.Ripaj Uddin, Hayatullah, Md.Nakib Hossen, Md. Nuruzzaman, Abu Yousuf, Md. Hasnain Mustak, Md. Shohel Rana   +10 more
doaj   +1 more source

Chemostratigraphy and paleoenvironmental analysis of sand-shale formations using core geochemical spectroscopy tools

Proceedings of the Nigerian Society of Physical Sciences
Modern investigations into spectral gamma-ray (SGR) records enhance understanding of sedimentary environments and paleoenvironmental conditions. This study examines a 111 m sand and shale interval in the Tak-1 well, Niger Delta Basin, to characterize ...
Oluwakemi Efemena, Franklin Lucas
doaj   +1 more source

Reactive Solute Transport Simulation of Multicomponent Cation Exchange and Diffusion Processes in Column Experiments with Clay-Rich Rock

Journal of Contaminant Hydrology
Clays and clay-rich rocks play often an important role in nuclear waste disposal due to their low permeability and high sorption capacity, acting as natural barriers to fluid movement and contaminant migration. Understanding the transport and sorption behaviours of hazardous elements in clay-rich environments is therefore essential for long-term ...
Hedayati, Marie, Herbert, Roger, Tsang, Yvonne, Niemi, Auli, Hu, Qinhong   +4 more
openaire   +3 more sources

Multi-scale experimental deformation and damage initiation of clay-rich rocks

Understanding the damage processes in clay-bearing rocks is a decisive factor in geological engineering, and for instance considering nuclear waste deep geological repositories. But, more generally they may also contribute to localized deformation, and thus the rupture of fault gauges in seismic zones.
Lusseyran, Matthieu, Tanguy, Alexandre, Bonnelye, Audrey, Dimanov, Alexandre, Fortin, Jerome   +4 more
openaire   +1 more source

Fault reactivation in clay-rich rocks – effects of water-clay interactions

Clay-rich rocks play an important role in critical practical applications, particularly as natural barriers in nuclear waste repositories and subsurface caprocks for CO2 storage. The interaction between electrostatically charged clay minerals and polar fluids (e.g., water) can lead to swelling or, under confined conditions, build-up of swelling stress.
Rast, Markus, Madonna, Claudio, Selvadurai, Paul Antony; id_orcid0000-0002-3846-8333, Salazar Vásquez, Antonio Felipe; id_orcid0000-0001-6199-4561, Wenning, Quinn; id_orcid0000-0002-6042-6295, Ruh, Jonas B.   +5 more
openaire   +1 more source

Insight of molecular dynamics simulation to better assess deformation and failure of clay-rich rocks

, 2021
Understanding the mechanical characteristics of clay-based materials is critical in earth sciences and a variety of industrial applications. Clay, as the main component in these heterogeneous materials, plays a significant role in the mechanical behavior of such materials. Through the Molecular Dynamics (MD) simulation, the present thesis is devoted to
openaire   +1 more source

Geochemical distribution and genesis of selenium-rich soils in Maojie Town on the Yunnan low-selenium belt. [PDF]

Sci Rep
Dong C, Li Z, Hou Z, Chen W, Zhang Y, Ba Y.   +5 more
europepmc   +1 more source