Sawyer, Dale S.2009-06-042009-06-042001Unger, Michael Rhodes. "Structural and tectonic interpretation of deep seismic reflection data offshore Spain and Portugal: A tectonic rifting model." (2001) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/17474">https://hdl.handle.net/1911/17474</a>.https://hdl.handle.net/1911/17474A portion of new seismic reflection/refraction data collected over the Iberia margin were processed and interpreted, resulting in the recognition of two previously unknown normal faults in the deep crust. These faults, named Q and R, formed during the Triassic-Cretaceous rifting of Pangea, and formation of the Atlantic basin. Previous studies have shown a third surface, the low-angle S reflector, in the area. S has previously been interpreted as a detachment surface or as a velocity interface. A model is proposed where extension was accommodated along Q, R and S during the rifting of Pangea. R and S acted as detachment surfaces as the hangingwall block moved westward. Late in the rifting process, the geometry of R and S was altered by motion of underlying serpentinized mantle material. This upwelling of the mantle controlled the shape of Sin three dimensions. Total extension across the margin is estimated at 1.67.133 p.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.GeologyGeophysicsThesisTHESIS GEOL. 2001 UNGER