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Introduction to stable isotope and radioisotope geochemistry. Isotope measurements are used to probe fundamental questions in the Earth and environmental sciences because they can be used to extract information about the timing of and/or chemical, physical, and biological processes associated with the formation of geomaterials. The first half of the course focuses on light isotope systems (O, C, S, etc.) and low-temperature applications, including: (1) tracing sources and sinks of fluids, sediments, biological materials, and contaminants, (2) studying rates and mechanisms of biochemical reactions, and (3) paleoenvironmental reconstructions. The second half of the course focuses on heavier isotope systems and high-temperature applications, including: (1) methods for dating of rocks and geologic processes using long-half-life radioisotopes, including the various isotope systems available and their applicability, and (2) isotope fractionation at high temperatures and the utility of radioisotope and novel stable isotope geochemistry for interrogating processes influencing the crust and mantle. Biweekly lab classes (scheduled in first week) will allow students to become familiar with principles of isotope measurements and interpretations. Mid-term and final exams. Recommended course background: AS.270.220 and AS.270.221, or instructor permission.