A primitive dark inclusion with radiation-damaged silicates in the Ningqiang carbonaceous chondrite

Michael Zolensky, Keiko Nakamura, Michael K. Weisberg, Martin Prinz, Tomoki Nakamura, Kazumasa Ohsumi, Akihiro Saitow, Masae Mukai, Matthieu Gounelle

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Abstract

A petrologic and TEM study of a remarkable dark inclusion (DI) in the Ningqiang CV3 chondrite reveals that it is a mixture of highly primitive solar nebula materials. The DI contains two lithologies. The first, lithology A, contains micron-sized olivine and pyroxene grains rimmed by amorphous materials with compositions similar to the underlying crystalline grains. The second, lithology B, appears to preserve the mineralogy of lithology A before formation of the amorphous rims. Overall, the Ningqiang DI appears to record the following processes: 1) formation (condensation and Fe-enrichment) of olivine crystals in the nebula with compositions of Fo42-62; 2) irradiation, resulting in amorphitization of the olivine and pyroxene to varying degrees; 3) partial annealing, resulting in formation of fairly large, euhedral olivine and pyroxene grains with remnant amorphous sharply-bounded rims; 4) in some cases, prolonged annealing, resulting in the formation of microcrystalline olivine or pyroxene rims. The latter annealing would have been a natural consequence of irradiation near the critical temperature for olivine; and 5) mixture of the above materials (lithology A) with nebular condensate high-Ca pyroxene and olivine, which escaped nebular processing, to become lithology B. We suggest that the amorphous rims in lithology A formed in an energetic solar event such as a bi-polar outflow or FU-orionis flare.

Original languageEnglish
Pages (from-to)305-322
Number of pages18
JournalMeteoritics and Planetary Science
Volume38
Issue number2
DOIs
Publication statusPublished - 2003 Feb

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

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    Zolensky, M., Nakamura, K., Weisberg, M. K., Prinz, M., Nakamura, T., Ohsumi, K., Saitow, A., Mukai, M., & Gounelle, M. (2003). A primitive dark inclusion with radiation-damaged silicates in the Ningqiang carbonaceous chondrite. Meteoritics and Planetary Science, 38(2), 305-322. https://doi.org/10.1111/j.1945-5100.2003.tb00266.x