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Impact of post-mortem alternation on oxygen isotope values of diatom silica

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dc.contributor.advisor Dodd, Justin P. en_US
dc.contributor.author Wiedenheft, Wilson en_US
dc.date.accessioned 2017-08-02T21:16:20Z
dc.date.available 2017-08-02T21:16:20Z
dc.date.issued 2014
dc.identifier.uri http://commons.lib.niu.edu/handle/10843/17771
dc.description Advisors: Justin P. Dodd. en_US
dc.description Committee members: Neil Blackstone; Reed Scherer. en_US
dc.description.abstract Oxygen isotope values of biogenic silica are increasingly used as proxies of paleoenvironmental conditions. A number of studies have demonstrated a strong relationship between the diatom silica and the temperature/oxygen isotope value of the formation water; however, some studies have indicated that early diagenesis of biogenic silica may alter the oxygen isotope values by several permil. Quantification of the maturation process has proven difficult since the mechanisms that drive post-mortem changes in the silica oxygen isotope values have not been well characterized. New silica maturation data from marine diatom, Stephanopyxis turris, cultured in a controlled laboratory experiment, demonstrate a rapid post-mortem decline in silica reactivity. A decrease in relative abundance of surface silanol groups coincides with a decrease in the surface charge density of freshly harvested frustules. These experiments demonstrate that rapid post-mortem alteration of biogenic silica provides a possible mechanism for alteration of oxygen isotope values in biogenic silica. en_US
dc.format.extent 71 pages en_US
dc.language.iso eng en_US
dc.publisher Northern Illinois University en_US
dc.rights NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors. en_US
dc.subject.lcsh Oxygen--Isotopes en_US
dc.subject.lcsh Silica en_US
dc.subject.lcsh Isotope geology en_US
dc.subject.lcsh Geology en_US
dc.subject.lcsh Geochemistry en_US
dc.title Impact of post-mortem alternation on oxygen isotope values of diatom silica en_US
dc.type Text en_US
dc.contributor.department Department of Geology and Environmental Geosciences en_US
dc.description.degree M.S. (Master of Science) en_US


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