A geochemical and osmium isotopic study of the group IVB iron meteorites and ungrouped irons Chinga, Tishomingo and Willow Grove
作者： Jenise Marie Honesto
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摘要: Title of Document: A GEOCHEMICAL AND OSMIUM ISOTOPIC STUDY OF THE GROUP IVB IRONS UNGROUPED CHINGA, TISHOMINGO WILLOW GROVE Jenise Marie Honesto, M.S., 2006 Directed By: Professor William F. McDonough, Department Geology Re-Os isotopic and highly siderophile element (HSE) systematics irons ungrouped iron meteorites Chinga, Tishomingo Willow Grove are presented. composition has been constrained by HSE (Re, Os, Ru, Ir, Pt, Pd) abundances, showing a limited range Pt concentration (31.15 to 32.75 ppb) despite wide in nickel (Ni) content (15.64 18.02 wt %). Using the system, crystallization age 4575 ± 56 Ma was determined for group. Fractional modeling suggests these samples crystallized from non-chondritic parent-body. Chinga is shown be unrelated IVBs through fractional modeling. have patterns comparable IVBs. platinum within The high Ni two (>27 %) poses problem their formation simple crystallization. IRON METEORITES By Honesto Thesis Submitted Faculty Graduate School University Maryland, College Park partial fulfillment requirements degree Master Science Advisory Committee: W.F. Chair A.J. Campbell R.J. Walker
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