Computer Science
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1593a&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, June 1988, p. 1593-1599.
Computer Science
28
Chondrites, Meteoritic Composition, Serpentine, Silicates, Chemical Evolution, Crystal Structure, Electron Microscopy, High Resolution, Murchison Meteorite, Olivine
Scientific paper
Recent HREM (high resolution electron microscopy) investigation has shed light on the characterization of matrix phyllosilicates in CM chondrites. In examining the Antarctic CM chondrite, Yamato-793321, by HREM, mineral grains which show an ED (electron diffraction) pattern consisting of both olivine and serpentine spots show disordered and defect structures in patchy HREM images. These data are interpreted as representing an 'intermediate phase' in the transformation from serpentine to olivine. This is the first description of such an 'intermediate phase'. In Belgica-7904, phyllosilicates seem to have been almost completely transformed to olivine. It is suggested that it formed by heating of matrix phyllosilicates. Preliminary heating experiments on Murchison (also a CM chondrite) showed that the matrix phyllosilicates transformed to a phase which gave an ED pattern and HREM image similar to those for Yamato-793321. The results of these heating experiments support the formation of the 'intermediate phase' by transformation from phyllosilicate to olivine during a heating event at a late stage.
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