Occurrence of oxidized components in Qingzhen enstatite chondrite

Details Occurrence of oxidized components in Qingzhen enstatite chondrite Occurrence of oxidized components in Qingzhen enstatite chondrite

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.311..138r&link_type=abstract

Nature (ISSN 0028-0836), vol. 311, Sept. 13, 1984, p. 138-140. NASA-supported research.

Computer Science

15

Chondrites, Enstatite, Iron Oxides, Galactic Evolution, Interstellar Matter, Solar System, Meteorites, Chondrites, Enstatites, Oxidation, Qingzhen, Composition, Unequilibrated Chondrites, Grains, Characteristics, Inclusions, Matrix, Chondrules, Reduction, Nucleation, Metals, Iron Oxide, Texture, Collisions, Origin, Formation, Transport, Samples, Meteorite

Scientific paper

It is shown that the most unequilibrated enstatite chondrite, Qingzhen, contains a population of enstatite grains which appear to have formed under more oxidizing nebular conditions than the bulk of the meteorite, which is highly reduced. These grains are black in transmitted light because of the presence of micron-sized inclusions of Ni-poor, Cr-rich metal, and occur either isolated within the matrix or in chondrule interiors. The textural occurrence of these grains argues against their having been introduced during collision of Qingzhen with an oxidized meteorite. Most likely, they originated in the same general nebular neighborhood of the reduced bulk Qingzhen material and were subsequently transported into the reducing environment either before or during the process of chondrule formation. The discovery of this once-oxidized material in Qingzhen posed significant constraints on existing models of formation of reduced matter in the solar system.

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