The Kaidun meteorite: Composition and origin of inclusions in the metal of an enstatite chondrite clast

Details The Kaidun meteorite: Composition and origin of inclusions in the metal of an enstatite chondrite clast The Kaidun meteorite: Composition and origin of inclusions in the metal of an enstatite chondrite clast

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996m%26ps...31..621i&link_type=abstract

Meteoritics, vol. 31, pages 621-626.

Computer Science

4

Scientific paper

Metal nodules are one of the major textural components of Kaidun sample #01.3.06 EH3-4. In terms of structure, the nodules are of three types: (1) globular, (2) zoned with a massive core and globular mantle, and (3) nodules with no internal structure. The size and composition of the globules in the nodules and grains of metal of the matrix are almost identical: no greater than 20 microns and Ni 5.95, Si 3.33 wt. %. The nodules contain small (usually < 5 *m) inclusions of SiO2; albitic glass; enstatite; roedderite; and a mixture of SiO2 and Na2S2. This is the first reported occurrence of a simple sulfide of an alkaline metal in nature. The formation of the inclusions appears to be related to condensation of material onto the surfaces of metal grains. The nodules appear to have formed by aggregation of separate grains (globules) of metal, with conservation of condensates on the grain surfaces as inclusions. The inclusions probably condensed over a significant temperature range from 1400 to 600 K. The aggregation of metal grains and formation of the nodules probably occurred simultaneously with condensation.

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