Assessing the Oxidative History of Miller Range Martian Meteorites

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dc.contributor.advisorFarquhar, Jamesen_US
dc.contributor.authorDottin III, James Wosleyen_US
dc.contributor.departmentGeologyen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2016-09-08T05:41:02Z
dc.date.available2016-09-08T05:41:02Z
dc.date.issued2016en_US
dc.description.abstractMiller Range (MIL) Martian meteorites are oxidized nakhlites. Early studies attribute their oxidation to reduction-oxidation reactions involving assimilated sulfate. I utilize the sulfur isotope and major element composition of the MIL pairs to assess their oxidative history. MIL sulfides display an average sulfur isotope composition that is different from Nakhla sulfate and sulfide. The sulfur isotope differences produce a mixing array between juvenile sulfur and mass-independent sulfur signatures, indicating assimilation of anomalous sulfur into the melt. I estimate an fO2 of QFM (+3.5 ± 0.4) and a sulfur content of 360 ppm ± 12 – 1300 ppm ± 50. With these results, I test the hypothesis of sulfate assimilation through models of charge balance, isotope mixing, and degassing of sulfur bearing compounds. I conclude that sulfate assimilation was significant in the oxidation of the MIL pairs but, additional oxidants were assimilated.en_US
dc.identifierhttps://doi.org/10.13016/M2MB8Q
dc.identifier.urihttp://hdl.handle.net/1903/18769
dc.language.isoenen_US
dc.subject.pqcontrolledGeologyen_US
dc.subject.pqcontrolledChemistryen_US
dc.subject.pquncontrolledGeochemistryen_US
dc.subject.pquncontrolledMarsen_US
dc.subject.pquncontrolledNakhlitesen_US
dc.subject.pquncontrolledOxygen fugacityen_US
dc.subject.pquncontrolledSulfuren_US
dc.titleAssessing the Oxidative History of Miller Range Martian Meteoritesen_US
dc.typeThesisen_US

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