Dept. of Geology
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Isotopic study of uranium: determining the isotopic fractionation of uranium during abiotic reduction with iron(II) (2015-01-21)Uranium is a contaminant of interest due to its toxicity and mobility in groundwater. It is a redox active element in which the oxidation state can change by the addition or removal of electrons. In one method of groundwater ...
Mercury stable isotope geochemistry as a tool for tracing sources and chemical transformations in the environment (2015-01-21)Mercury (Hg) is a redox active global contaminant. Hg has two stable oxidation states in the environment, Hg(0) and Hg(II). Hg(0) is significantly less soluble than Hg(II) and is less reactive. Hg(II) is very soluble and ...
Investigation of iron isotope variability in the bimodal Aztec Wash Pluton, Eldorado Mountains, Nevada (2015-01-21)Over the course of the past decade, our understanding of silicic plutons has undergone a fundamental shift, from envisioning pluton emplacement as one large magmatic intrusion to the concept of incremental emplacement, in ...
Isotopic fractionation of chromium and uranium during Cr(VI) reduction by ascorbate and U(VI) reduction by sulfide (2015-01-21)Chromium and uranium naturally occur in a variety of Earth’s waters. Both elements can undergo valence state changes at surface conditions which control their chemical behavior in near surface settings. Reduction of ...
Carbon cycling in the Caribbean reef-building coral Orbicella: quantitative evidence for enzymatic control of skeletal density banding and coral-endosymbiont physiological plasticity during seasonal environmental change (2015-01-21)Although modern Metazoan corals construct Earth’s wave-resistant coral reefs, serve as a cornerstone of marine ecology, and may help mitigate the accumulation of greenhouse gases by building a skeleton (composed of a calcium ...