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More Evidence for Multiple Meteorite Magmas Antarctic meteorite Graves Nunatak 06128/9 has abundant.

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Presentation on theme: "More Evidence for Multiple Meteorite Magmas Antarctic meteorite Graves Nunatak 06128/9 has abundant."— Presentation transcript:

1 http://www.psrd.hawaii.edu/Feb09/asteroidalMagmas.html More Evidence for Multiple Meteorite Magmas Antarctic meteorite Graves Nunatak 06128/9 has abundant sodium-rich (Ab 82-85 ) plagioclase. Its oxygen isotopic composition suggests it could be related to brachinites.

2 http://www.psrd.hawaii.edu/Feb09/asteroidalMagmas.html 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. More Evidence for Multiple Meteorite Magmas

3 http://www.psrd.hawaii.edu/Feb09/asteroidalMagmas.html More Evidence for Multiple Meteorite Magmas Meteorite GroupVolcanic?Albite in Plagioclase EucritesYes 5-25 Eucrite-2 (NWA 011)Yes15 Angrites (except one)Yes0.3 Angra dos ReisYes13 MesosideritesYes7-9 GRA-type Sodic Magmas Possibly82-85

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