Brachina - A new type of meteorite, not a Chassignite

Details Brachina - A new type of meteorite, not a Chassignite Brachina - A new type of meteorite, not a Chassignite

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983lpsc...14..237n&link_type=abstract

(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge

Physics

3

Achondrites, Igneous Rocks, Meteoritic Composition, Mineralogy, Iron Oxides, Melting, Olivine, Oxygen Isotopes, Radioactive Age Determination, Silicates, Trace Elements

Scientific paper

The results of a study of the small achondrite found in 1974 near Brachina, Australia are presented and discussed. Trace element data for Brachina were found to be quite different from that for Chassigny. The major differences are higher FeO/MnO, Ge/Al, and K/La ratios, W depletion, high siderophile content, near-horizontal REE pattern at about 1 x chondrite level, high refractory/nonrefractory metal ratios (e.g., Ir/Au), and chalcophile element depletion. Brachina's 4.5 billion year age and oxygen isotropic signature within the eucritic field further suggest that it is not related to Chassigny or SNC meteorites, though it may be related to primitive meteorites, such as silicate inclusions in IAB irons and winonaites.

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