S.M. Chernonozhkin, S.J. McKibbin, S. Goderis, S.J.M. Van Malderen, Ph. Claeys and F. Vanhaecke (2021) New constraints on the formation of main group pallasites derived from in situ trace element analysis and 2D mapping of olivine and phosphate. Chem. Geol. 562, 119996.
In this manuscript we developed novel LA-ICP-MS based analytical protocols and used trace element compositions of olivine and phosphate as a proxy of petrogenesys of main group pallasites and of formation history of the parent body of these meteorites. 2D trace element mapping of olivine crystals demonstrates Cr and Al zoning, likely as a result of magma recharge. It provides strong evidence for this olivine is not a restite of partial melting, but rather crystallized from a melt. Combined, the trace element signatures of olivine and phosphate in pallasites of the main group suggest that these meteorites are common products of planetary processes on chondritic or primitive achondrite-like precursor bodies, with the different subgroups highlighting distinct formation and evolution histories.