Results 131 to 140 of about 1,937 (173)
, 2018 Chondrules are spherical silicate grains which formed from protoplanetary disk material, and as such provide an important record of the conditions of the Solar System in pre-planetary times.
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The frequency of compound chondrules and implications for chondrule formation
Meteoritics & Planetary Science, 2004Abstract— The properties of compound chondrules and the implications that they have for the conditions and environment in which chondrules formed are investigated. Formulae to calculate the probability of detecting compound chondrules in thin sections are derived and applied to previous studies.
Fred J. Ciesla +2 more
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The dependence of chondrule density on chondrule size
Earth and Planetary Science Letters, 1980Spherical chondrules disaggregated from the meteorite Bjurbole have been found to have densities which vary as a function of size. The relationship is: ϱ = (3.78±0.06) − (1.25±0.37) d where ϱ is the chondrule density in g cm −3 and d is the diameter in cm.
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A systematic for oxygen isotopic variation in meteoritic chondrules [PDF]
Earth and Planetary Science Letters, 2015 International audiencePrimitive meteorites are characteristically formed from an aggregation of sub-millimeter silicate spherules called chondrules. Chondrules are known to present large three-isotope oxygen variations, much larger than shown by any ...
Yves Marrocchi, Marc Chaussidon
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Meteoritics, 1970
Very small chondrules, which are less than 250μ in size and are referred to as microchondrules, were discovered in twelve chondritic meteorites. The morphology, composition, and structure of these microchondritic bodies are investigated. In particular, the description of the principal, minor, and accessory minerals is given in some detail ...
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Very small chondrules, which are less than 250μ in size and are referred to as microchondrules, were discovered in twelve chondritic meteorites. The morphology, composition, and structure of these microchondritic bodies are investigated. In particular, the description of the principal, minor, and accessory minerals is given in some detail ...
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The chemical relationship between chondrules and matrix and the chondrule matrix complementarity
Earth and Planetary Science Letters, 2010Abstract Chondrules and matrix are the two major components of carbonaceous chondrites (CC). The Mg/Si ratios of chondrules and matrices in CV, CR, CO and CM chondrites are complementary: chondrules have super CI chondritic and matrices sub CI chondritic Mg/Si ratios.
Dominik C. Hezel, Herbert Palme
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Impact jetting as the origin of chondrules
Nature, 2015Chondrules are the millimetre-scale, previously molten, spherules found in most meteorites. Before chondrules formed, large differentiating planetesimals had already accreted. Volatile-rich olivine reveals that chondrules formed in extremely solid-rich environments, more like impact plumes than the solar nebula.
Brandon C, Johnson +3 more
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The Formation Conditions of Chondrules and Chondrites
Science, 2008Chondrules, which are roughly millimeter-sized silicate-rich spherules, dominate the most primitive meteorites, the chondrites. They formed as molten droplets and, judging from their abundances in chondrites, are the products of one of the most energetic processes that operated in the early inner solar system.
C M O'D, Alexander +3 more
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Clues to chondrule precursors: An investigation of vesicle formation in experimental chondrules
Geochimica et Cosmochimica Acta, 1994Abstract The absence of vesicles in chondrules and their presence in synthetic analogs yields information about the origin of chondrules. A variety of melting-crystallization experiments demonstrate the cause of vesicles in synthetic chondrules. Experiments involving the use of binding agents in sample preparation, samples with residual adsorbed ...
Susan V. Maharaj, Roger H. Hewins
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Relict and other anomalous grains in chondrules: Implications for chondrule formation
Journal of Geophysical Research: Solid Earth, 1984We have identified relict olivine and pyroxene grains in chondrules from ordinary and carbonaceous chondrites that probably did not crystallize in situ. Some of these olivines are clear, but others contain fine‐grained Fe,Ni (‘dusty olivines’) and resemble previously described occurrences in ordinary chondrites.
Alfred Kracher +2 more
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