Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..943n&link_type=abstract
Lunar and Planetary Science, volume 27, page 943
Computer Science
6
Achondrites, Achondrites: Primitive, Brachinites, Isotopes: Oxygen, Petrology
Scientific paper
A new meteorite, tentatively called Australia 1, was found to be a brachinite, the sixth member of this group. Brachinites (BRA) can now be divided into two subgroups, three of which are near-chondritic or Undepleted (UBRA) and three that are subchondritic or Depleted in basaltic component (DBRA). AUS 1 is a DBRA. Brachinites are primitive achondrites whose petrogenesis began with oxidized chondritic material of CI-like composition that accreted to a parent body which was internally heated, equilibrating the metal into the silicates (mainly olivine) as oxide and converting most of the opx into more olivine. Partial melting occurred in local areas and the basaltic component is either unsampled or explosively removed from the planet. This was followed by thermal metamorphism of the UBRA and DBRA components, resulting in their highly equilibrated textures and mineral compositions, within a limited range. This scenario is analogous to that of the acapulcoite/lodranite primitive achondrite group, which also has undepleted (ACA) and depleted (LOD) members, but with a less oxidized composition.
Clayton Robert N.
Ebihara M. E.
Mayeda Toshiko K.
Nehru Cherukupalli E.
Prinz Martin
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