Sawyer, Dale S2017-08-032017-08-032016-052016-04-21May 2016Jordan, Brian E. "Mechanisms of late-stage rift deformation: evidence from new 3D seismic data over the West Iberia margin." (2016) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/96563">https://hdl.handle.net/1911/96563</a>.https://hdl.handle.net/1911/96563I describe a new 3D seismic dataset over the West Iberia margin that demonstrates the complex 3D architecture of hyperextended continental crust and exhumed continental mantle at the distal edge of the margin. Faulted continental crustal blocks show higher degrees of extension in the north than the south. Similarly, pre-tectonic sediments are cut by more small-scale normal faults in the north. I hypothesize that extension within the frontal basin was constrained by basement topography, specifically a small mantle ridge identified at the southern extent of the basin that may have obstructed the extension of the continental crustal blocks and overlying sediments. Several thrust faults also cut the pre-tectonic sediments and are interpreted to be the result of gravity-driven sliding during late-stage extension. After large-scale extension of continental crustal blocks, further extensional creep caused small-scale normal faulting of the pre-tectonic sediment in the north.application/pdfengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.IberiaGaliciariftextensionmagma-poordeformationseismicinterpretationThesis2017-08-03