Physics
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998m%26ps...33..913k&link_type=abstract
Meteoritics & Planetary Science, vol. 33, no. 4, pp. 913-919.
Physics
6
Scientific paper
The fine-grained matrix of the Semarkona unequilibrated ordinary chondrite contains an assemblage of iron carbides that are associated with oxides, sulfides, carbonates, and hydrated silicates. The carbides consist of fine-scale epitactic intergrowths of cohenite (Fe3C) and Hogg carbide (Fe5C2) that formed as by-products of gas-solid reactions on the Semarkona parent body. The carbide intergrowths resulted from prograde reactions at moderate temperatures in the presence of a highly reducing carbon-bearing gas. The carburization occurred prior to the aqueous alteration episode that produced the Fe-rich phyllosilicates throughout the interchondrule matrix and the thin magnetite rims surrounding the carbide grains. The occurrence of the carbide intergrowths places an upper limit of <500 C on the maximum post-accretional thermal processing that occurred on the Semarkona parent body.
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