Other
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..359f&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 359.
Other
Meteoritic Composition, Minerals, Refractory Metals, Allende Meteorite, Evaporation, Trace Elements, Volatility, Single Crystals, Aluminum Oxides, Calcium Carbonates, Magnesium Oxides, Titanium Oxides
Scientific paper
Experiments have been conducted on the evaporation of hibonite in order to better understand the role of hibonite and its relationship to corundum in refractory inclusions in chondrites (e.g., the Allende meteorite). In addition, two samples were evaporated containing only synthetic oxides of the REE and other refractory trace elements (RTE) in order to examine the relative volatiles of these elements under vacuum evaporation conditions. Experiments were carried out on both natural and synthetically prepared hibonite. Fragments selected from a single crystal of Madagascar hibonite were evaporated at either 2100 or 2500 C. Synthetic hibonite was prepared using high-purity Al2O3 and CaCO3 and doped with 0.8 wt pct MgO, 1.6 wt pct TiO2, and approximately 200 ppm each of the RTE Hf, Zr, Y, Sc, Nb, V, Sr, and Ba, and all 14 REE; these samples were evaporated at 2100 C. Two samples containing subequal amounts of only REE and RTE were evaporated at 2400 C.
El Goresy Ahmed
Floss Christine
Palme Herbert
Rammensee Werner
Zinner Emst
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