Graduate Thesis Or Dissertation
 

Chemical and statistical analyses of chondrules from the Mokoia (CV3) meteorite

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  • Nearly 100 chondrules were extracted from -8.6g of the Mokoia (CV3) meteorite and have been analyzed by sequential instrumental neutron activation analysis (INAA). The resulting data were utilized in a comprehensive statistical characterization of these objects and, unlike similar investigations, virtually no loss of relevant data was incurred due to the use of inadequate or inappropriate software. Mass and elemental frequency distributions, correlation analysis and sorting coefficients support a "nebular" setting for chondrule genesis, and a scenario in which interstellar "dust-balls" (= chondrule precursors) are subject to some transient (short duration) high-energy process(es) followed by gravitationally or aerodynamically induced sorting, while it appears that an enhanced oxygen fugacity due to particle/gas fractionation may also be a factor. Conversely, a "planetary" setting for chondrule formation which requires the melting of pre-existing rocks (e.g., incompatible with the observed data. Factor analysis has led to the identification of the following precursor assemblages (i.e., factors) in the Mokoia chondrite: a refractory lithophile phase, a siderophile/chalcophile phase, a Mg-rich (silicate ?) phase, a refractory siderophile phase and a common lithophile phase. Previous studies of the Allende (CV3), Ornans (C03), Semarkona (LL3) and Chainpur (L3) meteorites are compared with these findings and interchondrite relationships are discussed (e.g., do these objects share similar parental materials, or are their compositions somehow complementary? were they formed in proximity with each other? etc.). A very unique oxide-sulfide-phosphate opaque assemblage was found in Mokoia and analyzed by INAA/electron-probe microanalysis, and may eventually serve to place constraints on the low-temperature thermal histories of chondrules or chondrites as well as provide information concerning the oxygen and sulfur fugacities within the Mokoia chondrite parent body.
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