Results 51 to 60 of about 9,317 (244)

Multi‐Elemental Analysis for Geographical Tracing of Chickpeas Produced in Nearby Locations Around a Protected Geographical Indication

Plant, Cell &Environment, EarlyView.
ABSTRACT The multi‐elemental profile has repeatedly been proposed as a reliable indicator of the geographical origin of plant‐derived foods, as mineral composition accurately reflects the local soil geochemistry and environmental factors. However, this approach may fail in distinguishing specimens from nearby locations, which are expected to be exposed
Ana Sayago, Raúl González‐Domínguez, Ángeles Fernández‐Recamales   +2 more
wiley   +1 more source

Paleomagnetism of the Great Dyke of the Kola Peninsula (2.68 Ga): New Evidence of Ultra-Low Paleointensity of the Earth’s Magnetic Field in the Late Archean

Учёные записки Казанского университета: Серия Естественные науки
Giant mafic dykes are the key markers of the Earth’s evolution in the Precambrian and have been the subject of extensive research. This article presents the results of the paleomagnetic, rock-magnetic, and paleointensity Banc studies of the Great Dyke of
V. V. Shcherbakova, R. V. Veselovskiy, G. V. Zhidkov, N. A. Aphinogenova, A. V. Samsonov, A. V. Stepanova, M. A. Smirnov   +6 more
doaj   +1 more source

Microbial mats in dinosaur ichnocoenoses

Sedimentology, EarlyView.
ABSTRACT Until now, the significance of microbial mats in preservation of dinosaur tracks and in reconstructing the palaeoenvironment in which dinosaurs roamed was rarely studied. Dinosaur tracks are commonly found close to ancient aquatic bodies where moist sediment had once allowed footstep registration.
Nora Noffke, Paul C. Murphey, Roger C. Buntin, Martin G. Lockley   +3 more
wiley   +1 more source

Exploring the Gravimetric and Geochronological Links in Ancient Terranes of the São Francisco Craton and Borborema Province, NE‐Brazil

Terra Nova, EarlyView.
ABSTRACT Deep crustal fragments and structural lineaments identified through satellite gravity data provide evidence for the extension of the reworked ancient basement of the Central African Block into the northern São Francisco Craton and southern Borborema Province.
Douglas Teixeira Martins, Wagner da Silva Amaral, Felipe Holanda dos Santos, Evilarde Uchôa Filho   +3 more
wiley   +1 more source

Gamma-ray spectrometry, magnetic and gravity signatures of Archean nuclei of the Borborema Province, Northeastern Brazil

Journal of the Geological Survey of Brazil
Gamma-ray spectrometry, as well as magnetic and gravity data, are used to investigate the geophysical signatures of the Archean nuclei of the Borborema Province.
Roberto Gusmão de Oliveira, Nitzschia Regina Rodrigues Domingos, Walter Eugênio de Medeiros, Vladimir Cruz de Medeiros, Frank Gurgel Santos, Marcus Flavio Nogueira Chiarini, Marília de Araújo Costa Rodrigues   +6 more
doaj   +1 more source

Near‐Synchronous Cambrian Evolution of the Transbrasiliano‐Kandi‐4°50′ Shear Zone in South America and Africa

Terra Nova, EarlyView.
ABSTRACT The Transbrasiliano‐Kandi‐4°50′ (TK4) shear zone in western Gondwana crosscuts South America and NW Africa for at least 6000 km. Despite its impressive size, the timing of the main episode of dextral ductile shearing is uncertain. We present detailed in situ multi‐mineral geochronology of mylonites from both Brazil and Algeria supporting that ...
F. A. Caxito, B. V. Ribeiro, F. Alkmim, A. Deramchi, C. L. Kirkland   +4 more
wiley   +1 more source

UV radiation limited the expansion of cyanobacteria in early marine photic environments

Nature Communications, 2018
The means by which planktonic cyanobacteria were able to persist through the Archean despite high fluxes of UV radiation are unclear. Here, the authors show that Fe(III)-Si rich precipitates in the Archean photic zone could have provided early planktonic
Aleksandra M. Mloszewska, Devon B. Cole, Noah J. Planavsky, Andreas Kappler, Denise S. Whitford, George W. Owttrim, Kurt. O Konhauser   +6 more
doaj   +1 more source

Investigation of Archean gamma-ray fingerprint: Methodology and tectonic application in central Brazil

Journal of the Geological Survey of Brazil
Gamma-ray spectrometric responses of Archean rocks were studied in order to define a characteristic signature for these rocks. As the half-life of the most frequent Thorium isotope (232Th – half life of 14.05 Ga) is more than 3 times longer relative to ...
Marcus Flavio Nogueira Chiarini, Loiane Gomes de Moraes, Elton Luiz Dantas, Reinhardt Adolfo Fuck, Elias Prado, Raphael Teixeira Corrêa, Jaime Scandolara, Antônio Frasca, Joseneusa Rodrigues, Andre Menezes Saboia   +9 more
doaj   +1 more source

Hf-Nd Isotopes in Archean Marine Chemical Sediments: Implications for the Geodynamical History of Early Earth and Its Impact on Earliest Marine Habitats

Geosciences, 2018
The Hf-Nd isotope systems are coupled in magmatic systems, but incongruent Hf weathering (‘zircon effect’) of the continental crust leads to a decoupling of the Hf-Nd isotope systems in low-temperature environments during weathering and erosion processes.
Sebastian Viehmann
doaj   +1 more source

Decoding palaeodepositional setting and redox conditions from the microbialites of the Archean Gamohaan Formation, South Africa. [PDF]

, 2023
Ansahmbom Nke, Rosalie Tostevin, Harilaos Tsikos   +2 more
openalex   +1 more source