Experience Anu

What causes some eruptions to be more explosive than others? Is it the total driving gas fuel, or how fast the gas escapes? This lecture examines both the volatile content and the speed of magma ascent immediately prior to eruption. Chemical zonation preserved inside glass pockets and crystals provides one of the fastest clocks in geology. These timescales of chemical diffusion operate over minutes to hours in the run-up to eruption. Initial results show that more explosive eruptions may result from higher rates of magma ascent. Terry Plank is the Arthur D. Storke Memorial Professor in the Department of Earth and Environmental Sciences at the Lamont Doherty Earth Observatory of Columbia University. She is a geochemist who studies magmas associated with the plate tectonic cycle. She is known particularly for her studies of subduction zones: the inputs on the ocean floor, the temperatures attained beneath volcanoes, the melting process in the mantle, and the water contents of magmas before they erupt. Plank