Results 21 to 30 of about 5,656 (205)
Dating and Tracing the Origin of Enstatite Chondrite Chondrules with Cr Isotopes
Astrophysical Journal, 2020 Chondrules are major components of chondrites and are believed to drive the accretion of planetary embryos. As such, constraining the timing and origin of chondrules is central for understanding the early evolution of the solar system and the formation ...
K. Zhu 朱 +3 more
semanticscholar +1 more source
Chondrule formation, metamorphism, brecciation, an important new primary chondrule group, and the classification of chondrules [PDF]
Earth and Planetary Science Letters, 1995 The recently proposed compositional classification scheme for meteoritic chondrules divides the chondrules into groups depending on the composition of their two major phases, olivine (or pyroxene) and the mesostasis, both of which are genetically important.
Derek W.G. Sears +2 more
openaire +1 more source
Time and duration of chondrule formation: Constraints from 26Al-26Mg ages of individual chondrules
Geochimica et Cosmochimica Acta, 2019 Chondrules from unequilibrated ordinary and carbonaceous chondrites belong to the oldest and most primitive materials from the early solar system and record chemical and isotopic signatures relating to their formation and evolution.
J. Pape +3 more
semanticscholar +1 more source
Barred olivine chondrules in ordinary chondrites: Constraints on chondrule formation
Meteoritics & Planetary Science, 2023 AbstractIn general, barred olivine (BO) chondrules formed from completely melted precursors. Among BO chondrules in unequilibrated ordinary chondrites, there are significant positive correlations among chondrule diameter, bar thickness, and rim thickness.
Alan E. Rubin +4 more
openaire +1 more source
Bubbles to Chondrites-II. Chemical fractionations in chondrites
Progress in Earth and Planetary Science, 2021 We attempt to develop a possible theory of chemical fractionations in chondrites, that is consistent with various features of chondritic components and current observation of protoplanetary disks (PPD).
Akihiko Hashimoto, Yuki Nakano
doaj +1 more source
Meteoritics and Planetary Science, 2020 Mineralogically zoned chondrules are a common chondrule type in chondrites. They consist of olivine cores, surrounded by low‐Ca pyroxene rims. By serial sectioning porphyritic chondrules from carbonaceous, ordinary, and enstatite chondrites, we ...
J. Barosch +4 more
semanticscholar +1 more source
Geophysical Research Letters, 2023 We employed MC‐ICP‐MS to measure the mass‐dependent Ca isotope compositions of Vesta‐related meteorites. Eucrites and diogenites show distinct Ca isotope compositions, which is caused by crystallization of isotopically heavy orthopyroxene. The Ca isotope
Ke Zhu +5 more
doaj +1 more source
A unifying model for the accretion of chondrules and matrix. [PDF]
Proc Natl Acad Sci U S A, 2019 Significance An impasse exists between chemical and astrophysical models that explore the accretion of the Solar System’s building blocks, the chondrites.
van Kooten EMME, Moynier F, Agranier A.
europepmc +2 more sources
The Origin of Chondrules: Constraints from Matrix-Chondrule Complementarity
Earth and Planetary Sciences Letters, 2015 One of the major unresolved problems in cosmochemistry is the origin of chondrules, once molten, spherical silicate droplets with diameters of 0.2 to 2 mm. Chondrules are an essential component of primitive meteorites and perhaps of all early solar system materials including the terrestrial planets.
Palme, H, Hezel, D.C, Ebel, D.S.
openaire +2 more sources
The Planetary Science Journal, 2023 Converging lines of evidence show that protoplanetary disks are complex environments hosting spatial and temporal variability at multiple scales.
Roger R. Fu +5 more
doaj +1 more source