Physical Sciences and Mathematics Commons^™

Sm-Nd, Lu-Hf, And Mn-Cr Isotope Geochemistry Of Achondrite Meteorites: Implications For The Formation Reservoirs Of Differentiated Planetesimals, Zhiguo Guo

Electronic Thesis and Dissertation Repository

Accretion and differentiation of planetesimals are critical steps of planetary formation. By studying achondrite meteorites, we can bring further geochemical and chronological constraints on the source and composition of materials and their evolution throughout the protoplanetary disk. Major and trace element analyses for mineral and whole-rock compositions and high-precision isotopic compositions for the short- and long-lived radiochronometers ⁵³Mn-⁵³Cr, ^147,146Sm-^143,142Nd and ¹⁷⁶Lu-¹⁷⁶Hf are reported for two eucrites, two diogenites, and three ungrouped achondrites. Of these, NWA 12338 is a newly classified ungrouped achondrite with an anomalously higher Δ¹⁷O than mean …