Bathymetry of a Rifted Margin
Becky Dorsey, Jack Loveless, Melissa Lamb, Andrew Goodliffe, Scott Bennett
Investigate the morphology of rifted margins to examine the roles of structural evolution, sedimentation, and physical and chemical evolution of the crust in the rifting process. This lesson can act as an introduction to more detailed examinations of the roles of extension, sedimentation, and obliquity in rifted margins.
Context for use
Upper-division course in Structural Geology, Plate Tectonics, or Regional Tectonics
Goals (which of these goals attain to the bathymetry intro??)
- Understand factors that control rifting and lithospheric rupture
- Complex deformation due to migration of triple junction through time
- Wow, sediments do that ?! 1% melt causes that to happen ?!
- GeoMapApp: create contour maps and profiles, extract data
- Google Earth: import kmz maps, overlays, create profile lines
- Excel: import data, sort and analyze data, make & analyze plots
- Project forward: interactions with long-term climate change (affecting sediment discharge), using the evolution of the rift to say something about contemporary earthquake hazard (connections to El Mayor-Cucupah earthquake, ShakeOut scenario for earthquake in Salton Trough), predict future shape/configuration of the GoC, Baja, and southern California 1, 5, 10 million years into the future.
- Written test
- Discussion or "oral exam"
- Analysis for a different margin
Introductory Lecture (PowerPoint 2007 (.pptx) 2.5MB Aug18 15)(15 minutes): A brief introduction to the NSF-MARGINS Rupturing Continental Lithosphere research initiative and the processes and factors that control rifting and lithospheric rupture.
(a) Bathymetry of Rifted Margins Lab (Microsoft Word 2007 (.docx) 19.8MB Jul21 15) (3 hours)