Results 201 to 210 of about 19,633 (239)

Isotopic composition of germanium in meteorites

Journal of Geophysical Research, 1963
The isotopic composition of germanium in eight meteorites was measured by solid-source mass spectrometer and compared with a sample of terrestrial origin. No difference in the isotopic composition of germanium from meteorites and the terrestrial sample was found outside of the error. (auth)
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The amphoterites and meteorites of similar composition

Geochimica et Cosmochimica Acta, 1964
Abstract The amphoteritos are a subclass of the olivine-hypersthene chondrites characterized by comparatively iron-rich olivine (Fa27–31) and orthopyroxene (Fs23–27) and a low content (1–5%) of nickel-iron. Other minerals include plagioclase (composition around An10), troilite, chromite and a phosphate mineral (apatite and/or merrillite).
Brian Mason, H.B. Wiik
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Iron Meteorites: Composition, Age, and Origin

2020
Iron meteorites are thought to be samples of metallic cores and pools that formed in diverse small planetary bodies. Their great diversity offers remarkable insights into the formation of asteroids and the early history of the solar system. The chemical compositions of iron meteorites generally match those predicted from experimental and theoretical ...
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Origin, age, and composition of meteorites

Space Science Reviews, 1964
This paper attempts to bring together and evaluate all significant evidence on the origin of meteorites. The iron meteorites seem to have formed at low pressures. Laboratory evidence shows that the absence of a Widmanstatten pattern in meteorites with > 16% Ni cannot be attributed to high pressures, but to supercooling or an unusually fast cooling rate
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The isotopic composition of krypton in meteorites

Journal of Geophysical Research, 1964
The isotopic composition and amounts of krypton extracted from four stone meteorites and one sample of meteoritic troilite have been measured. For the two chondrites Bruderheim and Abee, and the troilite phase of Canyon Diablo, the isotopic composition of krypton was found to be different from the isotopic composition of krypton in the atmosphere.
W. B. Clarke, H. G. Thode
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On the phase composition of meteorites

Journal of Geophysical Research, 1962
Seventy-three chondrites were examined. Their content of metallic nickel-iron, troilite, chromite, and silicate was determined quantitatively by planimetric integration of polished sections with an integration ocular, type 1. More than 300 large polished sections were measured, constituting a total area of 3700 cm2.
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The chemical composition of some stony meteorites

Geochimica et Cosmochimica Acta, 1956
Abstract New evidence is presented for the existence of two main groups among the chondrites. These are the H and L groups of Urey and Craig (1953), with 28 and 22 per cent total iron, respectively. Subdivision of the H-group into subgroups of different chemical composition is discussed.
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Relative Atomic Solar System Abundances, Mass Fractions, and Atomic Masses of the Elements and Their Isotopes, Composition of the Solar Photosphere, and Compositions of the Major Chondritic Meteorite Groups

Space Science Reviews, 2021
Katharina Lodders
exaly  

The Composition of Meteoritic Matter and the Origin of Meteorites

Science, 1949
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The composition of stony meteorites

Earth and Planetary Science Letters, 1968
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