Diffusion of Oxygen and Lithium Isotopes at a Contact between the Bushveld Complex and Metasedimentary Rock: Implications for the Timescale of Phepane Dome Diapirism

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dc.contributor.advisorPenniston-Dorland, Sarahen_US
dc.contributor.authorPotter, Rachelen_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.accessioned2009-07-03T05:45:42Z
dc.date.available2009-07-03T05:45:42Z
dc.date.issued2009en_US
dc.description.abstractWithin the Eastern Lobe of the Bushveld Complex, the Phepane Dome is a circular structure of metasedimentary rock hypothesized to have formed as a wallrock diapir. To constrain the duration of Phepane Dome formation using one-dimensional diffusion models of oxygen and lithium exchange between the Bushveld Complex and the Phepane Dome, samples taken across the contact between these two lithologies were measured for their O and Li isotopic compositions and Li concentrations. Models of O and Li diffusion through melt and through aqueous fluid were fit to the data, resulting in a diffusive distance of 1.0 m for oxygen and 14.1 m for lithium. Using experimentally constrained parameters for O and Li diffusion, a range of 2 kyrs to 2 Myrs was calculated from the diffusive distances. This is consistent with previous studies of the time for crystallization of the Bushveld Complex and a model of Phepane diapir development.en_US
dc.format.extent2259965 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/9360
dc.language.isoen_US
dc.subject.pqcontrolledGeologyen_US
dc.subject.pqcontrolledGeochemistryen_US
dc.subject.pquncontrolledBushveld Complexen_US
dc.subject.pquncontrolleddiapirismen_US
dc.subject.pquncontrolleddiffusionen_US
dc.subject.pquncontrolledLithiumen_US
dc.subject.pquncontrolledOxygen isotopesen_US
dc.subject.pquncontrolledPhepane Domeen_US
dc.titleDiffusion of Oxygen and Lithium Isotopes at a Contact between the Bushveld Complex and Metasedimentary Rock: Implications for the Timescale of Phepane Dome Diapirismen_US
dc.typeThesisen_US

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