The Geological Society of Washington founded 1893 Wednesday, March 5th, 2025 Meeting No. 1607 Theme of the event: Earth’s Mantle Val Finlayson, University of Maryland, College Park – A High Field Strength Perspective on Tungsten-182 Variability in Ocean Island Basalts Giacomo Criniti, Carnegie Earth and Planets Laboratory – Mineral Physics Constraints on the Composition of the Lower Mantle Jingchuan Wang, University of Maryland, College Park – Tracking Ancient Intraoceanic Subduction in the Deep Mantle: Insights from the Southeast Pacific Talks will be 20 minutes each with questions to follow. If anyone has any announcements or informal communications they would like to share with the society, please e-mail Vedran Lekic (ved@umd.edu<mailto:ved@umd.edu>) ahead of time. Refreshments at 7:30 p.m., formal program at 8:00 p.m. John Wesley Powell Auditorium 2170 Florida Avenue NW, Washington D.C. *** This meeting will not have an online / hybrid option *** Upcoming 2025 Spring Meetings: April 9 – Cosmos Club, theme: Rock deformation and tectonics April 30 – Earth and Planets Laboratory, theme: M3 - Moon, Mars, Mercury -- Vedran Lekić Professor and Director of Graduate Studies Department of Geology University of Maryland, College Park P: 301-405-4086, F: 301-314-9661 geol.umd.edu/~ved<http://geol.umd.edu/~ved>