This Project Grant award in the amount of $463,475 was provided by the National Science Foundation's Geosciences Program (CFDA 47.050) to the University of Houston System to investigate calcium isotope variations in ocean island basalts. The research aims to refine the use of calcium isotopes as tracers of the deep earth carbon cycle and clarify how carbonates from the earth's surface are processed during this cycle. Key activities include analyzing stable and radiogenic calcium isotope data from well-characterized ocean island basalt samples, tuning phase equilibrium models to constrain magmatic processes and mantle source compositions, and developing educational outreach materials. In addition to advancing scientific understanding of the deep earth carbon cycle, the project will provide research opportunities for students and create publicly available educational video resources. The award period runs from January 1, 2025 to December 31, 2027.