Title page for ETD etd-08042004-200816


Type of Document Master's Thesis
Author Cazes, Carrie Alison
Author's Email Address ccazes1@paws.lsu.edu
URN etd-08042004-200816
Title Overlap Zones, Growth Faults, and Sedimentation: Using High Resolution Gravity Data, Livingston Parish, LA
Degree Master of Science (M.S.)
Department Geology & Geophysics
Advisory Committee
Advisor Name Title
Juan M Lorenzo Committee Chair
Jeff Nunn Committee Member
Philip Bart Committee Member
Keywords
  • tepetate fault
  • baton rouge fault
  • gravity
  • overlap zones
  • lidar
  • growth faults
  • relay zones
Date of Defense 2004-04-30
Availability unrestricted
Abstract
In south Louisiana, parallel to the coast of the Gulf of Mexico, are belts of east-to-west trending, listric-normal faults with associated contemporaneous sedimentation and fault movement. The Tepetate-Baton Rouge Fault system in south-central Louisiana contains individual fault segments which are arcuate and overlap each other in map view, as seen on LiDAR data. Gravity survey data, with a sample spacing of 20 to 50 m, was collected across normal fault scarps.

Structural ramps may form in the area between overlapping normal fault segments creating an east-to-west gradient. This gradient change may divert streams and provide areas for coarse-grained sediments to accumulate. Results from modeling of gravity imply that: (1) the lateral density contrast from juxtaposed sands and shales across the fault does not produce significant gravity anomalies, (2) thick (50 to 75 m), asymmetric bodies with density contrasts of at least .1 g/cc, thicken toward the fault, and produce significant density contrasts within 100 m of the surface, and (3) symmetric gravity anomalies and associated topographic anomalies may be infilled, buried, remnant sand channels lying within 100 m of the surface.

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