Computer Science
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.1937s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 58, p. 1937
Computer Science
15
Calcium Oxides, Aluminum Oxides, Mixed Oxides, Murchison Meteorite, High Temperature Environments, Meteoritic Composition, Refractory Materials, Cooling, Scanning Electron Microscopy, Mineralogy, Crystallization, Melting
Scientific paper
Results are presented of analyses (by a SEM equipped with an EDXS system, INAA, and an electron microprobe) of a unique refractory spherule, B6, recovered from the Murchison C2 chondrite. The spinel-, hibonite-, CaAl4O7-, perovskite-bearing spherule appears to have been almost completely molten, requiring exposure to the highest temperature yet inferred for any refractory inclusion. Strong evidence is presented that the spherule crystallized from a liquid. The presence of measurable excess Al2O3 in B6 spinel despite the normal a(Al2O3)/a(MgO) ratio of the inclusion is further evidence of its unusually high temperature history. Despite the high peak temperature, no volatility-derived fractionation of REEs or isotopic fractionation of Mg occurred, probably because cooling was rapid enough for a very rapid formation of a spinel shell which sealed off the molten interior of the inclusion from the nebular gas.
Davis Aileen M.
Grossman Lawrence
Simon Steven B.
Yoneda Shigekazu
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