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A Multidisciplinary Investigation on the Influence of Archean Seawater Composition and UV radiation levels on the Survival and Evolution of Early Microorganisms
DownloadFall 2014
Life evolved in the oceans nearly four billion years ago, but the environmental conditions surrounding its evolution remains poorly understood. While Archean seawater (2.5 to 3.8 Ga) provided ancient microorganisms with the bioactive trace metals needed to sustain their metabolic requirements, it...
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Fall 2024
The Rae craton is one of the largest Archean–Paleoproterozoic age terranes on Earth and preserves >1.6 billion years of the planet’s history. However, significant uncertainty remains regarding how and when the crust of this craton was created and reworked. This thesis investigates the nature and...
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Identify Metamorphic and Primary Multiple Sulfur Isotopic Signatures in the 2.7 Ga Pyrite Nodules from the Southwestern Superior Province (Minnesota, USA)
DownloadSpring 2016
Sulfur isotopes of some Archean rocks show unique mass independent fractionation (S-MIF) signatures, which are generally considered to have been produced by UV radiolysis on volcanic SO2 in the oxygen-free Archean atmosphere. Based on the distinct S-MIF signals of different sulfur sources (i.e.,...