Results 191 to 200 of about 19,633 (239)
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The Journal of Geology, 1938
Convincing evidence has been found that the generally accepted ideas regarding the average composition of meteorites are incorrect, owing to the fact that collections have not been completely representative.
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Convincing evidence has been found that the generally accepted ideas regarding the average composition of meteorites are incorrect, owing to the fact that collections have not been completely representative.
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THE COMPOSITION OF THE CHASSIGNY METEORITE
Meteoritics, 1976Spark source mass spectrometric analysis of the Chassigny meteorite has given the following data (in ppm): Rb 0.4, Sr 7.2, Y 0.64, Zr 1.5, Nb 0.32, Ba 7.1, La 0.39, Ce 1.12, Pr 0.13, Nd 0.54, Sm 0.11, Eu 0.038, Gd 0.11, Tb 0.02, Dy 0.12, Ho 0.03, Er 0.09, Yb 0.10, Pb 1.0, Th 0.057, U 0.021.
Brian Mason +3 more
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THE COMPOSITION OF THE JOHNSTOWN METEORITE
Meteoritics, 1971A new analysis of the Johnstown meteorite, a hypersthene achondrite, gives the following results (weight percent): SiO2 53.48, TiO2 0.12, Al2O3 1.43, Cr2O3 0.83, FeO 15.63, MnO 0.54, MgO 25.87, CaO 1.40, Na2O 0.04, K2O 0.00, P2O5 0.00, H2O+ <0.1, H2O‐ 0.05, Ni <0.05, Co <0.01, FeS 1.18, sum 100.57.
Brian Mason, E. Jarosewich
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Presolar Grains in Meteorites and Their Compositions
Space Science Reviews, 2007Small amounts of pre-solar “stardust” grains have survived in the matrices of primitive meteorites and interplanetary dust particles. These grains—formed directly in the outflows of or from the ejecta of stars—include thermally and chemically refractory carbon materials such as diamond, graphite and silicon carbide; as well as refractory oxides and ...
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Composition and structure of meteorites
Bulletin of the United States National Museum, 1930USNM_index ...
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Compositional differences between meteorites and near-Earth asteroids
Nature, 2008Understanding the nature and origin of the asteroid population in Earth's vicinity (near-Earth asteroids, and its subset of potentially hazardous asteroids) is a matter of both scientific interest and practical importance. It is generally expected that the compositions of the asteroids that are most likely to hit Earth should reflect those of the most ...
Vernazza, P. +7 more
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Meteoritic Nanodiamonds: Alternative Composition of Xenon Components
Solar System Research, 2020For the first time, abundances of the main xenon components (Xe-P3, Xe-P3(fr), Xe-P6 and Xe-pr instead Xe-HL) in the nanodiamonds of Orgueil (CI), Tieschitz (H3.6) and Indarch (EH3-4) meteorites have been calculated. The Xe-pr component is the excess fraction of xenon isotopes in the Xe-HL component relative to Xe-P3 (fr) and mainly consists of the 124,
A. V. Fisenko, L. F. Semjonova
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A compositional classification scheme for meteoritic chondrules
Nature, 1992A compositionally based classification scheme for chondrules is proposed that will help in systematizing the wealth of data available and disentangling the effects of nebular and subsequent processes. The classification is not by texture or the composition of a single phase, or a mixture of these two, but rather is a comprehensive, systematic approach ...
Derek W. G. Sears +4 more
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The Average Composition of Meteoritic Iron*
Contributions of the Society for Research on Meteorites, 1946ABSTRACTAverage analyses are given by type and as a whole for iron meteorites (siderites, Si), based on selected analyses of 327 siderites. Average compositions are given also for pallasites (P), mesosiderites (Ms), and for the metallic part of chondrites (C).
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The composition of the stone meteorites and the origin of the meteorites
Geochimica et Cosmochimica Acta, 1953Abstract A study has been made of some 350 chemical analyses of stone meteorites available in the literature, and criteria have been applied in an attempt to select those which are more reliable. It is found that the chondrites fall into two distinct groups with regard to both the total iron content and the oxidation state of the iron.
Harold C. Urey, Harmon Craig
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