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University of Nebraska - Lincoln
Department of Earth and Atmospheric Sciences: Dissertations, Theses, and Student Research
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Sulfur Isotope Variations In The Elk Creek Carbonatite Complex, Southeastern Nebraska, Usa, Emily Campbell
Sulfur Isotope Variations In The Elk Creek Carbonatite Complex, Southeastern Nebraska, Usa, Emily Campbell
Department of Earth and Atmospheric Sciences: Dissertations, Theses, and Student Research
The Elk Creek Carbonatite Complex (ECCC) comprises eight different units of carbonatite and silicate rocks, including a magnetite-dolomite carbonatite that hosts the largest niobium deposit in the United States. This study focused on interpreting the first set of sulfur isotopes from this system to decipher between magmatic and secondary processes. Using sulfur isotope variations I was able to discriminate between hypogene and supergene mineralization, and measure (1) formation temperatures (2) possible sulfur source (3) degassing effects on isotopic composition, and (4) post-magmatic alteration. The groundwork for mapping and interpreting iron oxide alteration is also laid out in this thesis.
Hypogene …