Features observed on a seismic horizon at or near the Cretaceous-Paleogene boundary in a roughly 200 square km (77 square miles) 3D seismic survey from northern Louisiana resemble large subaqueous dunes or “mega-ripples.” It is hypothesized that these features may represent subaqueous dunes emplaced by tsunami waves generated by the end-Cretaceous Chicxulub Impact event on the Yucatán Peninsula. Seismic data are scrutinized to determine whether or not features observed in the data represent true subsurface geometries. Other hypotheses are tested including the possibility that these features may represent seismic data acquisition footprints, a portion of a slump deposit, or a portion of an aeolian dune field. Results indicate that it is very unlikely that these features represent an acquisition footprint, a slump deposit, or an aeolian dune field. Well-logs are interpreted and seismic velocities are calculated to determine a range of possible lithologies within the Upper Cretaceous interval but the results of the two methods are inconsistent with each other.
|Advisor:||Kinslad, Gary L.|
|Commitee:||Duex, Timothy W., Lock, Brian E., Richter, Carl|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 52/06M(E), Masters Abstracts International|
|Subjects:||Geology, Geophysics, Geomorphology|
|Keywords:||3D seismic, Chicxulub, Louisiana, Mega-ripples, Subaqueous dunes, Tsunami|
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