Results 101 to 110 of about 103,029 (328)

Extreme 54Cr-rich nano-oxides in the CI chondrite Orgueil -Implication for a late supernova injection into the Solar System

open access: yes, 2011
Systematic variations in 54Cr/52Cr ratios between meteorite classes (Qin et al., 2010a; Trinquier et al., 2007) point to large scale spatial and/or temporal isotopic heterogeneity in the solar protoplanetary disk.
Alexander   +76 more
core   +1 more source

The morphosedimentary record of glacial to postglacial environmental changes in West Wiyâshâkimî impact crater lake and adjacent areas, northern Québec, Canada

open access: yesBoreas, EarlyView.
Crater lakes in core regions of former ice sheets have the potential to preserve long‐term sedimentary archives that are otherwise rare in glaciated landscapes due to pervasive glacial erosion. Lake Wiyâshâkimî, an impact crater lake located in the inner core of the Québec‐Labrador Dome of the Laurentide Ice Sheet, provides a rare example of such a ...
Etienne Brouard, Patrick Lajeunesse
wiley   +1 more source

Geochemistry and petrology of primitive achondrite meteorites LEW 88280, MAC 88177, ALHA 81187, EET 84302, and LEW 88663 [PDF]

open access: yes
Primitive achondrites are meteorites that have mineral and bulk chemical compositions similar to the most primitive meteorites (chondrites) but have textures similar to more evolved meteorites (achondrites).
Field, Stephen W.
core   +1 more source

d‐amino acids: new functional insights

open access: yesThe FEBS Journal, EarlyView.
This review explores recent advances in understanding d‐amino acids (d‐AAs) and their pivotal roles across organisms, from plants to humans. d‐AAs have been implicated in key physiological processes, including cancer, inflammation, immune regulation, kidney disease, diabetes, and nervous system function.
Loredano Pollegioni   +5 more
wiley   +1 more source

Rare and unique meteorites from Antarctica [PDF]

open access: yes
The detection of Antarctic meteorites of Lunar and perhaps Martian origin, belongs to the most important discoveries in planetology during the last years.
Palme, H.
core   +1 more source

Characterisation of Geological Samples with Dual‐Energy XCT: A Comparison of Three Different Scanners

open access: yesGeostandards and Geoanalytical Research, EarlyView.
Key Points A stoichiometric calibration method for dual‐energy computed tomography allows non‐destructive characterisation of materials. Different acquisition settings and three different scanners were tested, characterising three rocks of known composition. Comparison of measurement results reveals the key parameters to be considered to perform useful
Margherita Martini   +7 more
wiley   +1 more source

Mysterious iodine-overabundance in Antarctic meteorites [PDF]

open access: yes
Halogen as well as other trace element concentrations in meteorite finds can be influenced by alteration processes on the Earth's surface. The discovery of Antarctic meteorites offered the opportunity to study meteorites which were kept in one of the ...
Dreibus, G., Schultz, L., Waenke, H.
core   +1 more source

The Meteoritic Theory [PDF]

open access: yesNature, 1889
I HAVE during the past six months been led from the study of our own atmosphere to consider certain phenomena relating on the one hand to the solar atmo-physics, and on the other hand to the evolution of our own globe and its atmosphere. There has thus arisen in my mind a system of cosmogony which has led me, quite independent of Mr.
openaire   +2 more sources

Comparison of Two Methods for Determination of Rhenium and Platinum‐Group Elements in Meteorites Using On‐Line and Off‐Line Matrix Separation Modes

open access: yesGeostandards and Geoanalytical Research, EarlyView.
Key Points PEEK tubing has been observed to adsorb Pd and Pt ions, resulting in significantly reduced recoveries of Pd and Pt elements. HPA‐S provides a more effective dissolution for meteorite samples than Carius tube digestion, resulting in higher mass fractions for PGE.
Yuling Zeng   +2 more
wiley   +1 more source

Terrestrial ages of Antarctic meteorites: Implications for concentration mechanisms [PDF]

open access: yes
Antarctic meteorites differ from meteorites fallen in other places in their mean terrestrial ages. Boeckl estimated the terrestrial half-life for the disintegration of stone meteorites by weathering under the climatic conditions of the Western United ...
Schultz, L.
core   +1 more source

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