Computer Science
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983polre..30..168t&link_type=abstract
(National Institute of Polar Research, Symposium on Antarctic Meteorites, 8th, Tokyo, Japan, Feb. 17-19, 1983) National Institut
Computer Science
9
Chondrites, Melting, Meteoritic Composition, Meteoritic Microstructures, Antarctic Regions, Cosmochemistry, Olivine
Scientific paper
The melting phase relations of a Yamato L3 chondrite (Y-74191) was studied for pressures from 6 kbar to 30 kbar as part of a planned series of high-pressure melting studies using different rock types of meteorites up to about 300 kbar. The intent of the program is to study details of the initial igneous processes which might have occurred in connection with the formation of the earth. Solidus of the chondrite is defined by eutectic melting of Fe-Ni-S at about 950 deg C regardless of pressure. At 15 kbar, silicate solidus of the chondrite is about 250 deg C higher than the metal/sulfide eutectic solidus and the temperature interval between the two solidi widens as the pressure interval between the two solidi widenes as the pressure increases. Composition of the metal/sulfide melt changes from FeS-rich to Fe-Ni-rich as temperature increases. Segregation of a ferrobasaltic partial melt on top of the residual olivines and the metal/sulfide globules has been observed. Gravitational settling of the dense metal/surface globules, however, did not occur under any experimental condition at least up to 10 hours. Based on the partial melting experiments a model for the genesis of pallasite meteorites is proposed.
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