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SUMMARY:Evaluating Dynamic Topography Predictions using the Stratigraphic 
 Record - Victoria Fernandes\, GFZ Potsdam
DTSTART:20240313T160000Z
DTEND:20240313T170000Z
UID:TALK210997@talks.cam.ac.uk
CONTACT:Megan Holdt
DESCRIPTION:Mantle convection exerts a key control on a range of geologica
 l processes operating at Earth’s surface\, such as the generation of top
 ography\, creation of accommodation space\, changes in sea-level and flood
 ing of continental interiors. A well-known example is the North American W
 estern Interior\, where geological observations require the influence of s
 ub-plate processes to explain the observed evolution of topography. Variou
 s geodynamic models also predict that large-scale vertical motions of the 
 region are driven by dynamic topography. In this study\, we test the predi
 ctions of dynamic topography for North America using novel databases of co
 ntinental uplift. The history of vertical motions of the North American We
 stern Interior is constrained using paleo-bathymetric markers and continen
 tal-scale sediment isopach maps. These data are used to test predictions o
 f dynamic topography from mantle circulation models. Results show that\, a
 lthough the general spatial patterns of dynamic topographic change can be 
 predicted\, mantle convection models struggle to predict the amplitude of 
 dynamic topography and the polarity of change. To investigate other possib
 le drivers of the observed\, geophysical constraints on properties of the 
 present-day shallow mantle are combined with an isostatic model to explore
  shallow-mantle contributions to uplift in the region.
LOCATION:Wolfson Lecture Theatre
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