Other
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.3209m&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, Nov. 1990, p. 3209-3218.
Other
22
Achondrites, Geochemistry, Meteoritic Composition, Petrography, Aluminum, Calcium, Carbonaceous Chondrites, Iron Oxides, Magma, Manganese Oxides, Olivine, Refractory Metals, Samarium, Sodium
Scientific paper
The major and trace elements were analyzed in samples of LEW86010, LEW87051, and Angra dos Reis angrites were analyzed using INAA and fused-bead EMP techniques. Results suggest that all three angrites originated on a volatile-depleted (Na-poor) but oxidized parent body or on several bodies. The combination of low Na and high FeO/MnO found in these samples suggests that the extreme Na depletion was caused by parent-body outgassing during differentiation, rather than by nebular processes. It was also found that the refractory-element abundances observed in LEW86010 and LEW87051 are related via olivine control; it is suggested that LEW86010 may be a residual melt from a LEW87051-like precursor or that LEW87051 formed from a LEW86010-like precursor via olivine accumulation. On the other hand, the Angra dos Reis displayed an unusual refractory element pattern suggesting that either the angrite parent body was heterogeneous or that Angra dos Reis was formed on a parent body different from that of the other two angrites.
Lindstrom Marilyn M.
Mittlefehldt David W.
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