About the event
The Department of Physics and Astronomy invites you to a colloquium featuring Dr. Catherine “Katie” Cooper, Washington State University. Dr. Cooper will present her talk, “Craton Stability: What’s Thickness (and shape) Got To Do With It” via Zoom.
Meet the speaker at 3:30 p.m. – join us in welcoming the speaker and for an informal chat!
Meeting ID: 957 1082 3436
Abstract: Cratons are long-lived regions on the Earth’s continents. They are the secret keepers of Earth’s history witnessing the planet’s tectonic progression without themselves experiencing active deformation. These regions could provide clues into the Earth’s evolution if we can understand what is driving their stability. One of the first-order observations of cratons is their thick lithosphere. Though discussions around craton stability primarily focus on buoyancy and rheology, thickness also plays a primary control on both the long-lived nature of stable cratons and the demise of destroyed cratons. In other words, craton stability is determined, in part, by the material properties of cratonic lithosphere, its thermal structure, and its relative strength in comparison to the material around it and the mantle below. The integrated strength of the cratonic lithosphere, which determines its relative stability, depends on its thickness. Correspondingly, the shape of a craton (or how its thickness varies over a lateral extent) should also play a role in its overall stability. In this talk, I will summarize the connections between craton thickness and (in)stability, the limits on craton thickness, and the consequences of long-lived, thick lithosphere. Finally, I will present new work demonstrating the stability of cratons also depends on their shape.