Mineralogy of interstitial rim materials of the Y74123 and Y790981 ureilites and their origin

Details Mineralogy of interstitial rim materials of the Y74123 and Y790981 ureilites and their origin Mineralogy of interstitial rim materials of the Y74123 and Y790981 ureilites and their origin

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991metic..26..195o&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 26, Sept. 1991, p. 195-201. Research supported by University of Tokyo, MOESC, and Mitsubishi

Computer Science

6

Meteoritic Composition, Mineralogy, Ureilites, Achondrites, Aluminum Oxides, Calcium Oxides, Chemical Composition, Electron Microscopy, Grain Boundaries, Impact Melts, Olivine, Pyroxenes

Scientific paper

Y74123 is an olivine-rich, relative unshocked ureilite and contains more interstitial pigeonitic materials than do ureilites which have been reported previously. These materials were studied by optical microscope, electron microprobe, SEM, high-resolution TEM, and analytical TEM to gain a better understanding of their nature and origin. The Y790981, with shock partial melts, has also been examined by the same techniques. Bulk chemical compositions of the interstitial materials in Y74123 are pyroxene-like and have higher CaO and Al2O3 contents than the large pigeonite and olivine core. Interstitial materials at olivine-pigeonite grain boundaries are richer in CaO and Al2O3 than those at olivine-olivine grain boundaries. TEM observations of the interstitial material of Y74123 show that it consists of alternating pigeonite-augite lamellae more than 3.5-micron thick on (001). This texture suggests that the rim material had already crystallized before the parent body breakup. The shock-produced glassy veins in Y790981 cut through the rim materials. These observations are consistent with the idea that the interstitial materials in this ureilite are a mixture of residual liquids of high Ca melts and shock-produced partial melts of olivine and pigeonite. This mixture accumulated along the grain boundaries and some of it is trapped within grains.

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