Mathematics – Logic
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..757b&link_type=abstract
Meteoritics & Planetary Science, vol. 35, no. 4, pp. 757-769 (2000).
Mathematics
Logic
3
Scientific paper
Two pallasites, Vermillion and Yamato 8451, have been studied to obtain petrologic, trace element and oxygen isotopic data. Both meteorites contain low-Ca and high-Ca pyroxenes (<2% by volume), and have been dubbed "pyroxene pallasites". Pyroxene occurs as large individual grains, as inclusions in olivine and in other pyroxene, and as grains along the edges of olivine. Symplectic overgrowths, sometimes found in Main Group and Eagle Station pallasites, are not seen in the pyroxene pallasites. Olivine compositions are Fa10-12, similar to those of Main Group pallasites. Siderophile trace element data show that metal in the two meteorites has significantly differing compositions that are, for many elements, outside the range of the Main Group and Eagle Station pallasites. These compositions also differ from those of IAB and IIIAB irons. Rare earth element (REE) patterns in merrillite are similar to those seen in other pallasites, indicating formation by subsolidus reaction between metal and silicate, with the merrillite inheriting its pattern from the surrounding silicates. The oxygen isotopic compositions of Vermillion and Y8451 are similar, but differ from Main Group or Eagle Station pallasites, as well as other achondrite and primitive achondrite groups. Although Vermillion and Y8451 have similar mineralogy, pyroxene compositions, REE patterns, and oxygen isotopic compositions, there is sufficient evidence to resist formally grouping these two meteorites. This evidence includes the texture of Vermillion, siderophile trace element data, and the presence of cohenite in Vermillion.
Boesenberg Joseph S.
Clayton Robert N.
Davis Andrew M.
Mayeda Toshiko K.
Prinz Martin
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