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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 220 (1968), S. 139-143 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The shock loading history of iron meteorites seems to alter profoundly their solid state response to annealing at moderate temperatures. This permits certain conclusions about the history of these iron meteorites to be ...
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 319 (1986), S. 390-393 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] At present, over 7,000 meteorites have been recovered from opposite ends of Antarctica, mainly from Queen Maud Land5, and from Victoria Land in East Antarctica and Marie Byrd Land in West Antarctica6. Some samples can confidently be shown to be fragments of the same meteorite, while others are ...
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Earth, moon and planets 76 (1997), S. 126-126 
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Earth, moon and planets 68 (1995), S. 605-637 
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The flux of small meteoroids, originating primarily from comets, consists of sporadic, random objects and others whose orbits are related. Here, we summarize data relevant to the question of whether the flux of large meteoroids of asteroidal origin (recoverable as meteorites) also consists of objects with random orbits, as well as coorbital objects. After reviewing some relevant properties of planetary materials, applications of two nuclear techniques - radiochemical neutron activation analysis (RNAA) and accelerator mass spectrometry (AMS) - to this question are discussed. Contents of ten thermally labile trace and ultratrace elements determined by RNAA (Ag, Bi, Cd, Cs, In, Rb, Se, Te, Tl, Zn) act as thermometers for thermal metamorphism in parent sources. These data, together with spectral reflectivity information, establish the nature of surfaces on abundant C-, G-, B- and F-class asteroids. Data for these ten cosmothermometers in H4-6 type ordinary chondrites, when treated by multivariate statistical techniques, demonstrate that a suite chosen by one set of criteria (the circumstances of their fall in May, between 1855 and 1895) is distinguishable by another set, i.e. compositionally, from all other such falls analyzed. Hence, this suite, H Cluster 1, has an average thermal history distinguishable from those of all other falls, demonstrating that near-Earth source regions for H chondrite falls changes rapidly. AMS measurements of cosmogenic36Cl (301 kyr half-life), quantify nominal terrestrial ages for Antarctic H chondrites whose contents of thermometric trace elements were also established by RNAA. While multivariate statistical analysis of RNAA data from Antarctic H chondrites with nominal terrestrial ages ≤50 kyr are not distinguishable from those of falls, older Antarctic H chondrites are compositionally distinguishable from falls. Assertions that these highly significant compositional differences reflect terrestrial or methodologic causes are refutable. This result argues that near-Earth source regions of H chondrites have changed over a long time, as well. Thus, the Earth receives a highly biased sampling of planetary objects in the Solar System in any one time-period.
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  • 5
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Chondritic meteorites provide valuable information about the condensation and early evolutionary histories of solid objects in the inner Solar System. Primitive chondrites probably reflect to some degree the condensation process(es) of solid material from the gaseous nebula and are particularly ...
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 204 (1964), S. 1289-1290 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The case illustrated is that for 44Ti, recently found to be 48*2 ± 0"9 years2. The results obtained from meteoritic data are within 25 per cent of this value, while results based on cross-section arguments have been in error by as much as a factor of 20. Experiments of a similar nature are planned ...
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 206 (1965), S. 1145-1146 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] From time to time reports have been made of the finding of diamonds in representatives of some other classes of meteorites, but these have not been confirmed. It is the purpose of this communication to report an attempted verification of the presence of diamonds in the Ghubara black chondrite6. ...
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 208 (1965), S. 636-638 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE well-known Arizona Meteorite Crater is an impact JL feature having a diameter of nearly 1 km. Estimates of the mass of the meteoroid which produced it have ranged from 30,000 (ref. 1) to 2-6 million2 metric tons. The (spherical) diameters corresponding to these estimates are 20 m and 86 m. The ...
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Contributions to mineralogy and petrology 130 (1998), S. 346-357 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Estimates of the oxygen fugacity of the source regions of martian shergottites are obtained from coexisting Fe-Ti oxides and from Fe3+/Fe2+ ratios in pyroxenes. These estimates are one to four log10 units lower than previously reported values, and indicate that the shergottite source region has an oxidation state about two or three orders of magnitude below the quartz-fayalite-magnetite (QFM) oxygen reference buffer. An approximation of the major element composition of the shergottite source region is obtained utilizing the MELTS petrologic modeling software. A bulk composition of the shergottite source region is derived, which is consistent with the generation of sher-gottites upon 3% partial melting at 10 kbar. This composition is decidedly less enriched in Na2O and FeOTot than previous estimates. When compared to the bulk composition of the terrestrial mantle, the source region of the shergottites is lower in CaO, Al2O3, Na2O and TiO2, and higher in MgO.
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  • 10
    Publication Date: 1995-01-01
    Print ISSN: 0167-9295
    Electronic ISSN: 1573-0794
    Topics: Geosciences , Physics
    Published by Springer
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