More Evidence for Multiple Meteorite Magmas

More Evidence for Multiple Meteorite Magmas

More Evidence for Multiple Meteorite Magmas Antarctic meteorite Graves Nunatak 06128/9 has abundant sodium-rich (Ab82-85) plagioclase. Its oxygen isotopic composition suggests it could be related to brachinites. http://www.psrd.hawaii.edu/Feb09/asteroidalMagmas.html More Evidence for Multiple Meteorite Magmas Brachinites could be residues after partial melting produced GRA basaltic magmas. GRA samples have REE concentrations similar to those produced by partial melting experiments on an L6 chondrite. http://www.psrd.hawaii.edu/Feb09/asteroidalMagmas.html More Evidence for Multiple Meteorite Magmas

Meteorite Group Volcanic? Albite in Plagioclase Eucrites Yes 5-25 Eucrite-2 (NWA 011) Yes 15 Angrites (except one) Yes 0.3

Angra dos Reis Yes 13 Mesosiderites Yes 7-9 GRA-type Sodic Magmas Possibly 82-85 http://www.psrd.hawaii.edu/Feb09/asteroidalMagmas.html

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