This is a graduate-level seminar-style course on fundamentals of mantle geochemistry. The course will use important papers in the scientific literature to introduce key topics in this field, including ocean island basalt and mid-ocean ridge basalt geochemical systematics, crust-mantle chemical exchange, and early Earth processes. The course will provide a foundation for high-temperature geochemical studies of the Earth's interior and a basis for understanding geochemical ties to adjacent disciplines such as geodynamics and seismology. Some introductory lectures will supplement discussions of readings. A substantial portion of the course will involve student-led discussions and development of scientific communication skills. SP 2021: Remote instruction; synchronous twice/week.