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Foreign meteoritic material of howardites and polymict eucrites

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Abstract

Howardites and polymict eucrites are fragments of regolith breccias ejected from the surface of a differentiated (eucritic) parent body, perhaps, of the asteroid Vesta. The first data are presented demonstrating that howardites contain, along with foreign fragments of carbonaceous chondrites, also fragments of ordinary chondrites, enstatite meteorites, ureilites, and mesosiderites. The proportions of these types of foreign meteoritic fragments in howardites and polymict eucrites are the same as in the population of cosmic dust particles obtained from Antarctic and Greenland ice. The concentrations of siderophile elements in howardites and polymict eucrites are not correlated with the contents of foreign meteoritic particles. It is reasonable to believe that cosmogenic siderophile elements are concentrated in howardites and polymict eucrites mostly in submicrometer-sized particles that cannot be examined mineralogically. The analysis of the crater population of the asteroid Vesta indicates that the flux of chondritic material to the surface of this asteroid should have been three orders of magnitude higher than the modern meteoritic flux and have been comparable with the flux to the moon’s surface during its intense meteoritic bombardment. This provides support for the earlier idea about a higher meteoritic activity in the solar system as a whole at approximately 4 Ga. The lithification of the regolith (into regolith breccia) of the asteroid Vesta occurred then under the effect of thermal metamorphism in the blanket of crater ejecta. Thus, meteorite fragments included in howardites provide record of the qualitative composition of the ancient meteorite flux, which was analogous to that of the modern flux at the Earth surface.

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Authors and Affiliations

  1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia

    K. A. Lorenz & M. A. Nazarov

  2. Naturhistorisches Museum, A-1014, Wien, Burgring 7, Österreich

    G. Kurat & F. Brandstaetter

  3. Departament für Lithosphärenforschung, Universität Wien, Althanstrasse 14, 1090, Wien, Österreich

    G. Kurat & Th. Ntaflos

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  1. K. A. Lorenz
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Original Russian Text © K.A. Lorenz, M.A. Nazarov, G. Kurat, F. Brandstaetter, Th. Ntaflos, 2007, published in Petrologiya, 2007, Vol. 15, No. 2, pp. 115–132.

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Lorenz, K.A., Nazarov, M.A., Kurat, G. et al. Foreign meteoritic material of howardites and polymict eucrites. Petrology 15, 109–125 (2007). https://doi.org/10.1134/S0869591107020014

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