Other
Scientific paper
Feb 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970gecoa..34..169w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 34, Issue 2, pp.169-184
Other
21
Scientific paper
Electron-microprobe analysis of Si, P and Ni in the metal grains and associated schreibersite and perryite of eight enstatite achondrites shows that the compositions of these phases are relatively constant within a given meteorite, but show substantial variations between meteorites. We have tentatively defined a sequence among these achondrites on the basis of the Si concentrations in the metal, with Pena Blanca Spring at the low-Si extreme and Shallo-Water at the high-Si end of the sequence. We propose that detailed studies of other properties will show correlations with the positions of these objects within this sequence. An examination of the properties of both the enstatite chondrites and achondrites indicates that these objects can be considered to form a single evolutionary sequence. Support for this hypothesis is provided by data on the schreibersite and metal composition, the Mn / Si and Na / Si ratios in the bulk samples, cosmic-ray ages, and combined radioactive age-formation intervals. This sequence is understandable only if all members were produced in the same process or processes. These processes appear to have occurred in the solar nebula prior to accretion. The inclusion of such diverse meteorites in a single genetic sequence indicates that the presence of chondrules is not a necessary requirement for primordial material, and that material of primordial composition can have very coarse textures and can vary widely in composition. A model for the formation of the enstatite chondrites and achondrites is proposed.
Wai Chien M.
Wasson John T.
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