Results 51 to 60 of about 5,656 (205)
Chondrules as direct thermochemical sensors of solar protoplanetary disk gas
Science Advances, 2018 Cathodoluminescence reveals structures indicative of gas-assisted epitaxial growth during chondrule melt crystallization. Chondrules, millimeter-sized igneous spherules comprising the major component of most chondritic meteorites, formed during the first
G. Libourel, M. Portail
semanticscholar +1 more source
THE Formation of chondrule-like particles in RF discharge plasma
Physical Sciences and Technology, 2023 Chondrules are fundamental components of chondritic meteorites and play a vital role in understanding the formation of the early solar system. This study focuses on the synthesis of chondrule-like particles in a plasma environment using a radiofrequency
Assan Abdirakhmanov +8 more
doaj +1 more source
Geochimica et Cosmochimica Acta, 2019 The 26Al-26Mg ages of FeO-rich (type II) chondrules from Acfer 094, one of the least thermally metamorphosed carbonaceous chondrites, were determined by SIMS analysis of plagioclase and olivine/pyroxene using a radio frequency (RF) plasma oxygen ion ...
A. Hertwig +4 more
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Apatite in Bennu samples indicates multiple stages of aqueous alteration
Meteoritics &Planetary Science, EarlyView.Abstract Calcium phosphates are ubiquitous in planetary materials, including samples returned from asteroid Bennu by the OSIRIS‐REx mission. We characterized apatite [Ca5(PO4)3(F,Cl,OH)] grains in Bennu samples by scanning electron microscopy, electron microprobe analysis, and transmission electron microscopy to investigate their compositions, mineral ...
Laura B. Seifert +10 more
wiley +1 more source
Chondrule Destruction via Dust Collisions in Shock Waves
The Astrophysical JournalA leading candidate for the heating source of chondrules and igneous rims is shock waves. This mechanism generates high relative velocities between chondrules and dust particles.
Yuji Matsumoto +2 more
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Kivesvaara C2 chondrite: silicate petrography and chemical composition [PDF]
Bulletin of the Geological Society of Finland, 1983 Fragments of the Kivesvaara meteorite were said to have been found in Paltamo, northern Finland in 1968. The chemical and mineral composition and the textural features show that this meteorite is a rare C2 carbonaceous chondrite.
K.A. Kinnunen, R. Saikkonen
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, 2016 Nucleosynthetic isotope anomalies are powerful tracers to determine the provenance of meteorites and their components, and to identify genetic links between these materials. Here we show that chondrules and matrix separated from the Allende CV3 chondrite
G. Budde +5 more
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Can Chondrules Be Produced by the Interaction of Jupiter with the Protosolar Disk? [PDF]
Astrophysical Journal, 2019 Chondrules are crystallized droplets of silicate melt formed by rapid heating to high temperatures (>1800 K) of solid precursors followed by hours or days of cooling.
J. Bodénan +4 more
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Geochemical and petrographic re‐evaluation of ungrouped iron meteorites from Western Australia
Meteoritics &Planetary Science, EarlyView.Abstract Under the current classification scheme, ungrouped irons make up ~11% of all recognized iron meteorites. A further ~7% of iron meteorites are currently classified as simply “irons” and are yet to be fully classified. To potentially classify these meteorites, newer approaches, including either statistical modeling or advanced geochemical ...
Ashley Rogers +6 more
wiley +1 more source
Oxygen isotopic diversity of chondrule precursors and the nebular origin of chondrules
Earth and Planetary Science Letters, 2018 FeO-poor (type I) porphyritic chondrules formed by incomplete melting of solid dust precursors via a yet-elusive mechanism. Two settings are generally considered for their formation: (i) a nebular setting where primordial solids were melted, e.g.
Y. Marrocchi +4 more
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