Results 71 to 80 of about 4,544 (181)

Mineralogy of the clay fraction of Alfisols in two slope curvatures: III - spatial variability

Revista Brasileira de Ciência do Solo, 2013
A good knowledge of the spatial distribution of clay minerals in the landscape facilitates the understanding of the influence of relief on the content and crystallographic attributes of soil minerals such as goethite, hematite, kaolinite and gibbsite ...
Livia Arantes Camargo, José Marques Júnior, Gener Tadeu Pereira   +2 more
doaj   +1 more source

Source‐to‐sink sediment transport reversals during glacial sea‐level lowstands sustain soil formation on pericoastal carbonate terrains

Sedimentology, Volume 73, Issue 5, Page 1892-1910, August 2026.
ABSTRACT Understanding the processes that drive soil formation is crucial for developing sustainable land‐use strategies, as changing land‐use practices and climate change exacerbate soil erosion. The formation of substantial arable soils on carbonate bedrock requires substantial dust accretion as the underlying bedrock lacks siliciclastic material. In
Daniel Palchan, Yael Jacobi Glass, Olga Berlin, Yoav Ben Dor   +3 more
wiley   +1 more source

Goethite Nanorods: Synthesis and Investigation of the Size Effect on Their Orientation within a Magnetic Field by SAXS

Nanomaterials, 2020
Goethite is a naturally anisotropic, antiferromagnetic iron oxide. Following its atomic structure, crystals grow into a fine needle shape that has interesting properties in a magnetic field.
Stephan Hinrichs, Larissa Grossmann, Eike Clasen, Hannah Grotian genannt Klages, Dieter Skroblin, Christian Gollwitzer, Andreas Meyer, Birgit Hankiewicz   +7 more
doaj   +1 more source

Synchronous Advance of the Alpine Glaciation Across the Northern and Southern Tibetan Plateau During the Mid‐Pleistocene Transition

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract Chronological studies of glacial sediments from the Shishapangma and Yarlung Tsangpo River valley indicate that Quaternary glaciation on the southern Tibetan Plateau commenced at ∼0.75–0.83 Ma. However, the oldest glacial deposits in the northern plateau are dated to only ∼0.46 Ma, markedly later than the Middle Pleistocene glacial ...
Chengying Liu, Benhong Guo, Wenjiao Xiao, Zaijun Li, Linkai Wang, Fei Wang   +5 more
wiley   +1 more source

Phosphate sorption by goethite and kaolinite‐goethite (k‐g) system as described by isotherms

Communications in Soil Science and Plant Analysis, 1998
Abstract Goethite and kaolinite are active sorbents in soils and sediments. Unfortunately measuring their phosphate sorption capacity is difficult, because of the relatively low proportion of these clay minerals in many natural mixtures and the difficulties involved in concentrating and separating them from accompanying minerals.
Ioannou, A., Dimirkou, A., Papadopoulos, P.   +2 more
openaire   +2 more sources

Paleomagnetic Constraints on the Separation of the Olongbuluke Block From the North China Block During the Late Cambrian–Middle Ordovician and Its Tectonic Significance

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract The collisional evolution of the micro‐blocks in the northeastern Tibetan Plateau is relatively well constrained. However, the reason why a fragment of the North China Block, the Olongbuluke Block, became separated from North China by the Central Qilian Block (a fragment of the South China Block) remains unclear.
Teng Wang, Yanan Zhou, Ruiyang Chai, Xin Cheng, Hanning Wu   +4 more
wiley   +1 more source

Phyllosilicate-based adsorbents decorated with iron oxyhydroxides: Application for lead, chromates and selenites removal [PDF]

Science of Sintering
Expanded vermiculite (EVer) was acid activated and silanized in order to obtain suitable substrate’s surface for decoration with iron oxyhydroxides (IO).
Bugarčić Mladen, Veličković Zlate, Radovanović Željko, Milošević Milena, Mijatov Slavko, Stojanović Jovica, Marinković Aleksandar   +6 more
doaj   +1 more source

Red Pigments in the Bronze Age Burials in the North Caucasus: Complex Analysis for Identification of Pyroprocessing of Iron Minerals

Вестник Волгоградского государственного университета. Серия 4. История, регионоведение, международные отношения, 2018
Ochre is a natural pigment of yellow or red color, mainly consisting of iron minerals. Along with determining the origin of mineral dyes, one of the main problems of studying natural pigments in archaeology is identifying the origin of the so-called “red”
Pavel I. Kalinin, Viktor A. Trifonov, Natalya I. Shishlina, Andrey O. Alekseev   +3 more
doaj   +1 more source

Lateritic Contribution to Enhancing the Grade of Iron Ore from Serra Leste Deposit in Carajás Mineral Province, Brazil

Mining
The Carajás Province, located in the southeastern Amazon, hosts some of the world’s largest high-grade iron deposits. Despite their economic importance, the processes linking lateritic weathering and iron enrichment remain incompletely understood.
Rayara do Socorro Souza da Silva, Marcondes Lima da Costa, Pabllo Henrique Costa dos Santos   +2 more
doaj   +1 more source

Forms of iron in parent rocks of soils developed from Lower Triassic (Buntsandstein) deposits in the NE part of the Holy Cross Mountains (Poland)

Soil Science Annual, 2018
The aim of the study was to characterize pedogenic iron forms in the sediments of the Lower Triassic (Buntsandstein) in the north-eastern part of the Holy Cross Mountains.
Zagórski Zbigniew, Kisiel Monika
doaj   +1 more source