Results 131 to 140 of about 446 (179)
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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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Meteoritics & Planetary Science, 2001
Abstract— Isotopic compositions and abundances of boron were measured in sixteen chondrules from seven chondrites by ion microprobe mass spectrometry. The chondrules are of the porphyritic, barred, and radial type and host meteorites include carbonaceous, ordinary, and enstatite chondrites.
Hoppe, P. +3 more
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Abstract— Isotopic compositions and abundances of boron were measured in sixteen chondrules from seven chondrites by ion microprobe mass spectrometry. The chondrules are of the porphyritic, barred, and radial type and host meteorites include carbonaceous, ordinary, and enstatite chondrites.
Hoppe, P. +3 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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Annual Review of Earth and Planetary Sciences, 1997
▪ Abstract Chondrules are ∼1-mm igneous droplets in primitive meteorites, and their abundance suggests widespread melting in the protoplanetary disk. Chondrules with relict unmelted grains or igneous rims record multi111ple melting events. There are two main types of chondrules, type I (FeO-poor and volatile-poor) and type II [FeO-rich and ...
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▪ Abstract Chondrules are ∼1-mm igneous droplets in primitive meteorites, and their abundance suggests widespread melting in the protoplanetary disk. Chondrules with relict unmelted grains or igneous rims record multi111ple melting events. There are two main types of chondrules, type I (FeO-poor and volatile-poor) and type II [FeO-rich and ...
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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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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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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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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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